Information determination method, signal determination method, signal demodulation method, device and communication equipment

Abstract

The invention discloses an information determination method, a signal determination method, a signal demodulation method, devices and communication equipment, and belongs to the technical field of communication, and the information determination method comprises the steps that first equipment determines first information, the first information is used for determining an invariant component and a variable component contained in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used for sending a first signal, the invariant component is used for enhancing a second signal, the variable component is used for bearing information of a second device, the second signal is a carrier signal sent by a radio frequency signal sending end, and the second device is a backscatter communication BSC device; and the first device sends the first information to at least one of the second device and a third device.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to an information determination method, a signal determination method, a signal demodulation method, a device and a communication device. Background Art

[0002] Symbiotic communication is a special type of backscatter communication (BSC) system, in which the BSC device can use the main link (i.e., the direct link between the RF signal transmitter and the RF signal receiver) signal to carry its own information, which can enhance the main link signal and assist the main link communication. However, since the secondary link (i.e., the backscatter link from the RF signal transmitter to the RF signal receiver via the BSC device) signal is loaded on the main link signal, when the main link signal reception strength is weak (such as being blocked), it will affect the demodulation of the secondary link signal. Summary of the invention

[0003] The embodiments of the present application provide an information determination method, a signal determination method, a signal demodulation method, an apparatus and a communication device, which can solve the problem that the secondary link signal cannot be demodulated due to the weak reception strength of the main link signal.

[0004] In a first aspect, a method for determining information is provided, the method comprising:

[0005] The first device determines first information, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0006] The first device sends the first information to at least one of the second device and a third device;

[0007] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0008] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0009] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0010] In a second aspect, an information determination device is provided, which is applied to a first device, and includes:

[0011] A determination module, configured to determine first information, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0012] A first sending module, configured to send the first information to at least one of the second device and the third device;

[0013] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0014] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0015] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0016] In a third aspect, a signal determination method is provided, comprising:

[0017] The second device receives first information from the first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0018] The second device determines a first constellation pattern according to the first information;

[0019] The second device sends the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern;

[0020] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0021] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0022] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0023] In a fourth aspect, a signal determination device is provided, which is applied to a second device, and includes:

[0024] A first receiving module, configured to receive first information from a first device, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0025] A determination module, configured to determine a first constellation pattern according to the first information;

[0026] a sending module, configured to send the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern;

[0027] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0028] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0029] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0030] In a fifth aspect, a signal demodulation method is provided, comprising:

[0031] The third device receives first information from the first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0032] The third device processes the received third signal according to the first information to demodulate the second signal and the variable component from the third signal;

[0033] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0034] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0035] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0036] In a sixth aspect, a signal demodulation device is provided, which is applied to a third device, and the device includes:

[0037] A receiving module, configured to receive first information from a first device, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0038] a demodulation module, configured to process the received third signal according to the first information, so as to demodulate the second signal and the variable component from the third signal;

[0039] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0040] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0041] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0042] In the seventh aspect, a communication device is provided, which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the third aspect are implemented, or the steps of the method described in the fifth aspect are implemented.

[0043] In an eighth aspect, a first device is provided, the first device comprising a processor and a communication interface, wherein the processor is used to: determine first information, the first information is used to determine a constant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the constant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; the communication interface is used to: the first device sends the first information to at least one of the second device and a third device;

[0044] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0045] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0046] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0047] In a ninth aspect, a second device is provided, the second device comprising a processor and a communication interface, wherein the communication interface is used to: receive first information from the first device, the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; the processor is used to: determine the first constellation pattern according to the first information; the communication interface is also used to: send the first signal to one of the first device and a third device according to the first constellation pattern and the bit mapping rule of the first constellation pattern;

[0048] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0049] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0050] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0051] In a tenth aspect, a third device is provided, the third device comprising a processor and a communication interface, wherein the communication interface is used to: receive first information from a first device, the first information is used to determine an invariant component and a variable component contained in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; the processor is used to: process the received third signal according to the first information, so as to demodulate the second signal and the variable component from the third signal;

[0052] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0053] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0054] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0055] In the eleventh aspect, a communication system is provided, comprising: a first device, a second device and a third device, wherein the first device can be used to execute the steps of the information determination method as described in the first aspect, the second device can be used to execute the steps of the signal determination method as described in the third aspect, and the third device can be used to execute the steps of the signal demodulation method as described in the third aspect.

[0056] In the twelfth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the third aspect are implemented, or the steps of the method described in the fifth aspect are implemented.

[0057] In the thirteenth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the steps of the method described in the first aspect, or the steps of the method described in the third aspect, or the steps of the method described in the fifth aspect.

[0058] In the fourteenth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement the steps of the method described in the first aspect, or the steps of the method described in the third aspect, or the steps of the method described in the fifth aspect.

[0059] In an embodiment of the present application, a first device determines first information, and the first information is used to determine the constant component and the variable component contained in the first constellation pattern, and the bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern for sending a first signal, the constant component is used to enhance the second signal, the variable component is used to carry the second device's own information, the second signal is a carrier signal sent by the radio frequency signal transmitting end, and the second device is a BSC device; the first device sends the first information to at least one of the second device and the third device; wherein the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; when the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; when the first device is the radio frequency signal receiving end, the third device is the radio frequency signal transmitting end. In the embodiment of the present application, by determining the constant component and the variable component contained in the first constellation pattern, and the bit mapping rule of the first constellation pattern, the BSC device can send a specific signal to the radio frequency signal receiving end based on this, and the radio frequency signal receiving end can demodulate the received signal based on this. It can be seen that in the embodiment of the present application, regardless of whether the receiving strength of the main link signal is normal, the secondary link signal can be demodulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a schematic diagram of a network structure applicable to the embodiments of the present application;

[0061] Figure 2a is a schematic diagram of a backscatter communication system;

[0062] Figure 2b It is a schematic diagram of the backscatter communication principle;

[0063] Figure 3 It is a schematic diagram of a single-base backscatter communication system;

[0064] Figure 4 It is a schematic diagram of a bistatic backscatter communication system;

[0065] Figure 5 There are eight architectures of backscatter communication systems under cellular networking;

[0066] Figure 6 It is a schematic diagram of a symbiotic communication system;

[0067] Figure 7a is a schematic diagram of the constellation points and bit mapping rules of s(n);

[0068] Figure 7b is a schematic diagram of the first type of bit mapping rule of x(n);

[0069] Figure 7cis a schematic diagram of the second type of bit mapping rule of x(n);

[0070] Figure 8 is a flow chart of an information determination method provided by an embodiment of the present application;

[0071] Fig. 9 is a schematic diagram of a symbiotic communication system provided in an embodiment of the present application;

[0072] Fig.10a is a schematic diagram of a constellation pattern of a main link signal provided in an embodiment of the present application;

[0073] Fig.10b It is a schematic diagram of a constellation pattern of a transmission symbol of a secondary link provided in an embodiment of the present application;

[0074] Fig.11 is a structural diagram of an information determination device provided in an embodiment of the present application;

[0075] Fig.12 is a flow chart of a signal determination method provided in an embodiment of the present application;

[0076] Fig.13 is a schematic diagram of the operation of the modulation end of the collaborative modulation provided in an embodiment of the present application;

[0077] Fig.14 is a structural diagram of a signal determination device provided in an embodiment of the present application;

[0078] Fig.15 is a flow chart of a signal demodulation method provided by an embodiment of the present application;

[0079] Fig.16 is a demodulation schematic diagram of cooperative modulation provided in an embodiment of the present application;

[0080] Fig.17 is a schematic diagram of a reception symbol constellation pattern provided in an embodiment of the present application;

[0081] Fig.18 is a structural diagram of a signal demodulation device provided in an embodiment of the present application;

[0082] Fig.19 is a structural diagram of a communication device provided in an embodiment of the present application;

[0083] Fig. 20 is a structural diagram of a terminal provided in an embodiment of the present application;

[0084] Fig.21 It is a structural diagram of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0085] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0086] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0087] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0088] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0089] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. In addition to the above-mentioned terminal devices, it can also be a chip in the terminal, such as a modem chip, a system-on-chip (SoC). It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device, wherein the access network device may also be referred to as a radio access network (RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B (home evolved NodeB), a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0090] The present application relates to backscatter communication technology. The following is a brief introduction to the backscatter communication related technology.

[0091] 1. Backscatter Communication (BSC)

[0092] Backscatter communication refers to the backscatter communication device (hereinafter referred to as BSC device) using the radio frequency signal from other devices or the environment to modulate the signal to transmit its own information. BSC devices may include at least one of the following:

[0093] The BSC device in the traditional radio frequency identification (RFID) is generally an electronic tag (Tag), which belongs to the passive Internet of Things (IoT) device (Passive-IoT);

[0094] Semi-passive tags, which have a certain amplification capability for downlink reception or uplink reflection;

[0095] Active Tag: This type of terminal can send information to the reader without relying on the reflection of the incident signal.

[0096] Figure 2a Schematic diagram of backscatter communication system. Figure 2b A simple implementation method is that when the tag needs to send a '1', the tag reflects the incident carrier signal, and when the tag needs to send a '0', the tag does not reflect the incident carrier signal.

[0097] The BSC equipment controls the reflection coefficient Γ of the circuit by adjusting its internal impedance, thereby changing the amplitude, frequency, phase, etc. of the incident carrier signal to achieve signal modulation. The reflection coefficient of the signal can be expressed as:

[0098]

[0099] Where Z0 is the antenna characteristic impedance and Z1 is the load impedance. Assume that the incident signal is S in (t), the output signal is Therefore, the BSC device can achieve corresponding amplitude modulation, frequency modulation or phase modulation by reasonably controlling the reflection coefficient.

[0100] The typical backscatter communication architecture can be divided into a monostatic system and a bistatic system.

[0101] 2. Single-base system

[0102] Figure 3 The figure shows a single-base backscatter communication system, a typical example of which is a traditional RFID system. The system includes a BSC device (such as a tag) and a reader. The reader includes an RF source and a BSC receiver, wherein the RF source is used to generate an RF signal (usually a continuous wave (CW)) to power and provide a carrier to the BSC device. The RF signal can be understood as an excitation signal. The BSC device modulates and backscatters the CW, and the BSC receiver in the reader receives the backscatter signal and then demodulates the signal. Since the RF source and the BSC receiver are in the same device, such as the reader here, it is called a single-base backscatter communication system. In this system, since the RF signal sent from the BSC device will undergo a double near-far effect caused by the signal attenuation of the round-trip signal, the signal energy attenuation is large, so the single-base system is generally used for short-distance backscatter communication, such as traditional RFID applications.

[0103] 3. Dual-base system

[0104] Different from the single-base system, the RF source and BSC receiving end in the dual-base system are separated. Figure 4The dual-base system avoids the problem of large round-trip signal attenuation. In addition, the performance of the backscatter communication system can be further improved by properly placing the RF source.

[0105] 4. Backscatter Communication System in Cellular Networking

[0106] In cellular networks, the backscatter communication system can be specifically divided into the following types based on the RF source, uplink, and downlink: Figure 5 The eight architectures shown.

[0107] Table 1 Typical architecture of backscatter communication in cellular networking

[0108]

[0109]

[0110] In architecture 1, the base station is the RF source, the downlink transmitter of the BSC device (i.e., the control command transmitter), and the uplink receiver of the BSC device (i.e., the BSC receiver). In other words, the base station communicates directly with the BSC device. (Note: This deployment architecture has high requirements on the receiving sensitivity of the base station and BSC equipment, but is simple to deploy).

[0111] In architecture 2, the base station is also an RF source, but there is a relay to relay the uplink from the BSC device to the base station. Of course, the relay can also relay the downlink from the base station to the BSC device, which is not listed here.

[0112] In architecture 3, the UE is used as an RF radio source and is used to forward downlink and uplink signals from the BSC device to the base station.

[0113] In architecture 3-1a, the base station is the RF source, and the base station directly transmits downlink data to the BSC device; in the uplink, the BSC device first sends a backscattered signal to the UE, which is then forwarded to the base station by the UE.

[0114] In architecture 3-1b, the UE is the RF source, and the base station directly transmits downlink data to the BSC device; in the uplink, the BSC device first sends a backscattered signal to the UE, which is then forwarded to the base station by the UE.

[0115] In architecture 3-2a, the base station is the RF source. The base station first sends downlink data to the UE, which is then forwarded to the BSC device. In the uplink, the BSC device directly sends a backscatter signal to the base station.

[0116] In architecture 3-2b, the UE is the RF source, and the base station first sends downlink data to the UE, which is then forwarded to the BSC device; in the uplink, the BSC device directly sends a backscatter signal to the base station.

[0117] In architecture 3-3a, the base station is the RF source. The base station first sends downlink data to the UE, which is then forwarded to the BSC device. In the uplink, the BSC device sends a backscattered signal to the UE, which is then forwarded to the base station by the UE.

[0118] In architecture 3-3b, the UE is the RF source, and the base station first sends downlink data to the UE, which is then forwarded to the BSC device; in the uplink, the BSC device sends a backscattered signal to the UE, which is then forwarded to the base station.

[0119] 5. Symbiotic communication

[0120] Symbiotic communication refers to a type of backscatter communication system that meets special conditions and is not based on a single-base architecture. Figure 6 A backscatter communication system with a dual-base architecture is shown. It can be seen that due to the presence of the BSC device, the carrier signal sent from the base station can be reflected by the BSC device to reach the UE. At the same time, the BSC device can modulate the signal it needs to send onto the carrier signal. For the UE, the signal energy received from the base station will be stronger than when there is no BSC device, because the BSC device provides an additional multipath. When the main link (i.e., the direct link from the base station to the UE) signal is relatively weak, the presence of the secondary link (i.e., the backscatter link (referred to as the reflection link) reflected from the base station to the UE through the BSC device) signal can improve the reception quality of the main link signal. At the same time, the BSC device also utilizes the carrier and spectrum provided by the main link signal, helping the main link while "hitchhiking", achieving a "mutual benefit" and "symbiosis" effect.

[0121] Assume that the channel response parameter of the direct link from the base station to the UE is h, and the channel response parameter of the reflected link from the base station to the UE through the BSC device is g=g1g2. The nth symbol sent by the base station and the BSC device are s(n) and c(n) respectively. Then the signal received by the UE can be expressed as

[0122] y(n)=hs(n)+gs(n)Γ(c(n))+z(n) (1)

[0123] Where Γ is the reflection coefficient of the BSC device and z(n) is the noise.

[0124] It can be seen that the symbols sent by the BSC device are loaded on the main link signal. Therefore, the UE needs to jointly demodulate s(n) and c(n). For example, maximum likelihood detection can be used to obtain

[0125]

[0126] in, and represent the possible value sets of s(n) and c(n), respectively. and They represent the estimated values ​​of s(n) and c(n) respectively.

[0127] 6. Collaborative Modulation Scheme for Symbiotic Communication

[0128] From the above description, it can be seen that the UE needs to jointly demodulate s(n) and c(n). However, if the strength of the main link signal at the UE is weak, such as when there is an obstruction in the direct link, the signal received by the UE will change from formula (1) to

[0129] y(n)=gs(n)Γ(c(n))+z(n) (3)

[0130] At this time, affected by the time-varying s(n), it will be difficult for the UE to decode normally. For example, for formula (2), and These are all optimal estimates.

[0131] In order to solve this problem, a collaborative modulation scheme has been proposed. The main idea is to add a time-invariant component (referred to as the invariant component) to the reflected signal.

[0132]

[0133] Among them, α is the time-invariant component used to assist in decoding the main link signal, and βc(n) is the time-varying component (also called variable component) that carries the secondary link information. Considering that the BSC device is a passive device, Γ pro (c(n)) has the following constraints:

[0134]

[0135] The received signal at the UE can be written as

[0136]

[0137] And x(n) represents the composite signal composed of the main link signal and the secondary link signal,

[0138]

[0139] Obviously, in order to assist the direct link signal, the angle of α needs to be the same as h / g, that is, ∠α=∠(h / g).

[0140] It can be seen that by optimizing α and β, a compromise can be achieved between assisting the primary link and transmitting the secondary link's own information. The optimal collaborative modulation scheme needs to meet two conditions:

[0141] (1) Euclidean distance: maximize the minimum Euclidean distance of the constellation of the composite signal x(n), noting that x(n) is composed of s(n) and c(n);

[0142] (2) Mapping rule between constellation points and bits: minimize the Hamming distance between adjacent constellation points.

[0143] The optimal cooperative modulation scheme is designed below for the case where the direct link signal is a Quadrature Phase Shift Keying (QPSK) signal and the secondary link signal is a binary modulation (0 / 1 bit). Figure 7a The constellation points and bit mapping rules of s(n) are shown. According to the maximum Euclidean distance criterion, x(n) can be regarded as the result of rotating and superimposing the constellations of s(n), but there are two superposition modes, corresponding to two bit mapping rules. Figure 7b is the first type bit mapping rule of x(n), Figure 7c is the second type of bit mapping rule for x(n). It can be found that under the first type of bit mapping rule, the Hamming distance between adjacent constellation points is smaller, so the first type of bit mapping rule is selected. Next, with the goal of maximizing the minimum Euclidean distance of the composite signal constellation points, the specific values ​​of α and β are optimized, and the results are as follows:

[0144] Example 1: h = 0

[0145] For the case where the direct link is completely blocked, the optimal composite signal constellation is the standard 8-phase shift keying (8PSK) constellation, that is: α * =cos(π / 8),β * =-jsin(π / 8).

[0146] Example 2: 0<|h / g|<1

[0147] in,

[0148] Example 3:

[0149] in, For θ to make the following equation true

[0150]

[0151] Example 4:

[0152] in and They are

[0153]

[0154] Example 5:

[0155] α * =0,|β * |=1,∠β * ∈(-π,0).

[0156] As can be seen from the above, the above-mentioned collaborative modulation scheme is complex to design, especially when different modulation schemes are used for the main link signal or different modulation orders are used for the secondary link, the corresponding modulation scheme needs to be designed separately, which is not flexible and increases the complexity of system implementation.

[0157] In view of this, an embodiment of the present application provides a collaborative modulation and demodulation scheme for symbiotic communication, which can reduce the design complexity of collaborative modulation and improve system flexibility through simple design criteria and constellation pattern design that is independent of the main link modulation method.

[0158] In combination with the accompanying drawings, the information determination method, information determination device, signal determination method, signal determination device, signal demodulation method, signal demodulation device, communication equipment and storage medium provided in the embodiments of the present application are described in detail through some embodiments and their application scenarios.

[0159] Figure 8 A flow chart of an information determination method provided by an embodiment of the present application is shown. Figure 8 As shown, the information determination method includes the following steps:

[0160] Step 801: A first device determines first information, where the first information is used to determine a constant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern;

[0161] Step 802: The first device sends the first information to at least one of the second device and the third device.

[0162] The first constellation pattern is a constellation pattern used to transmit the first signal, which may be determined by a constant component and a variable component.

[0163] Among them, the invariant component is a component used to enhance the second signal, and the second signal is a carrier signal sent by the radio frequency signal transmitter. The variable component is a component used to carry the second device's own information, and the second device is a BSC device. The invariant component can be understood as a time-invariant real number symbol used to assist the main link communication, and the variable component can be understood as a complex number used to carry the BSC device's own information and varies with the information to be sent. The invariant symbols, time-invariant symbols, time-invariant real number symbols, etc. involved in the embodiments of the present application all refer to invariant components, and the time-varying symbols, random symbols, etc. involved in the embodiments of the present application all refer to variable components. For the convenience of description in the following, the invariant component can be represented as α, and the variable component can be represented as

[0164] Since the invariant component is used to enhance the carrier signal sent by the RF signal transmitting end, when the direct link between the RF signal transmitting end and the RF signal receiving end is blocked and the direct link signal reception strength is weak, the direct link signal can be enhanced by the invariant component, thereby reducing the degree of influence of the direct link blockage on the direct link signal. Since the variable component is used to carry the self-information of the second device, the second device can determine the self-information to be carried according to the variable component, thereby helping the second device to determine the signal to be sent.

[0165] The first device may include a radio frequency signal transmitting end or a radio frequency signal receiving end. Specifically, when the first device is a radio frequency signal transmitting end, the third device may be a radio frequency signal receiving end. In this case, the first device may be a network side device, and the third device may be a terminal. When the first device is a radio frequency signal receiving end, the third device may be a radio frequency signal transmitting end. In this case, the first device may be a terminal, and the third device may be a network side device.

[0166] In the embodiment of the present application, the node that determines the first information can be considered as the master node. In step 801, the first device determines the first information, that is, the first device is the master node. That is, the master node (i.e., the first device) can be either a network side device or a terminal.

[0167] In the embodiment of the present application, both the BSC device and the radio frequency signal receiving end need to obtain the first information in order to perform subsequent transmission of the first signal and demodulation of the signal. In step 802, if the first device is the radio frequency signal transmitting end and the third device is the radio frequency signal receiving end, then the first device can send the first information to the second device and the third device. If the first device is the radio frequency signal receiving end and the third device is the radio frequency signal transmitting end, it means that the radio frequency signal receiving end determines the first information by itself, that is, directly obtains the first information, then the radio frequency signal receiving end (that is, the first device) can send the first information to the second device, or send the first information to the third device, and then the third device forwards the first information to the second device.

[0168] The second signal is a carrier signal sent by the RF signal transmitter. When the first device is the RF signal transmitter, the second signal can be understood as the carrier signal sent by the first device. The first signal is a signal generated by the second device based on the backscattering of the second signal. For the convenience of description, the second signal can be represented as s(n) and the first signal can be represented as c(n). When the first device is the RF signal transmitter and the third device is the RF signal receiver, the signal interaction between the first device, the second device and the third device is as follows: the first device sends the second signal, and after receiving the second signal sent by the first device, the second device generates the first signal based on the backscattering of the second signal and sends it to the third device. The third device then demodulates the received signal to demodulate the second signal and the second device's own information carried in the first signal.

[0169] In an embodiment of the present application, a first device determines first information, and the first information is used to determine the constant component and the variable component contained in the first constellation pattern, and the bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern for sending a first signal, the constant component is used to enhance the second signal, the variable component is used to carry the second device's own information, the second signal is a carrier signal sent by the radio frequency signal transmitting end, and the second device is a BSC device; the first device sends the first information to at least one of the second device and the third device; wherein the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; when the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; when the first device is the radio frequency signal receiving end, the third device is the radio frequency signal transmitting end. In an embodiment of the present application, by determining the constant component and the variable component contained in the first constellation pattern, and the bit mapping rule of the first constellation pattern, the BSC device can send a specific signal to the radio frequency signal receiving end based on this, and at the same time, the radio frequency signal receiving end can demodulate the received signal based on this. It can be seen that in an embodiment of the present application, regardless of whether the receiving strength of the main link signal is normal, the secondary link signal can be demodulated.

[0170] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0171] Refer to the constellation pattern;

[0172] a modulation order of the first signal;

[0173] A factor by which the reference constellation pattern is scaled or rotated.

[0174] That is, for the invariant component and the variable component included in the first constellation pattern included in the first information, the first device may directly determine the two explicit components, the invariant component and the variable component, or may indirectly indicate the invariant component and the variable component through the target information.

[0175] For example, when the target information includes a reference constellation pattern and a modulation order of the first signal, the second device and the third device may determine the constant component and the variable component based on the reference constellation pattern and the modulation order of the first signal. When the target information includes a reference constellation pattern and a factor for scaling or rotating the reference constellation pattern, the second device and the third device may determine the transformed constellation pattern based on the reference constellation pattern and the factor for scaling or rotating the reference constellation pattern, and determine the constant component and the variable component based on the transformed constellation pattern.

[0176] Optionally, the first device determines the first information, including:

[0177] The first device determines the constant component and the variable component according to a performance indicator that the second signal needs to meet, a performance indicator that the variable component needs to meet, and a maximum transmission energy limit parameter of the second device.

[0178] Here, the performance indicators that the second signal needs to meet can be agreed upon by the protocol or configured by the network. Correspondingly, the performance indicators that the variable component needs to meet can be agreed upon by the protocol or configured by the network. The energy of both the constant component and the variable component is subject to the maximum transmission energy limit parameter of the second device. As an example, assuming that the maximum transmission energy of the second device is C, the energy of the constant component is α(n), and the energy of the variable component is β(n), then ||α(n)+β(n)||≤C. The maximum transmission energy limit parameter of the second device is related to the performance parameters of the second device, for example, related to the maximum transmission power of the second device.

[0179] Optionally, the first device determines the constant component and the variable component according to a performance indicator that the second signal needs to satisfy, a performance indicator that the variable component needs to satisfy, and a maximum transmission energy limit parameter of the second device, including:

[0180] The first device determines the invariant component according to a performance indicator that the second signal needs to meet; and

[0181] The first device determines the variable component according to a performance indicator that the variable component needs to meet, the invariant component, and a maximum transmission energy limit parameter of the second device.

[0182] Optionally, the performance indicator that the second signal needs to meet includes at least one of the following:

[0183] The minimum Euclidean distance to which the constellation points of the second signal need to be modulated;

[0184] The bit error rate to which the second signal needs to be modulated;

[0185] The bit error rate to which the second signal needs to be modulated;

[0186] A symbol error rate to which the second signal needs to be modulated;

[0187] The block error rate to which the second signal needs to be modulated.

[0188] Here, the minimum Euclidean distance can be determined directly or by other performance indicators.

[0189] Optionally, the performance index that the variable component needs to meet includes at least one of the following:

[0190] The minimum Euclidean distance to which the constellation points of the variable components need to be modulated;

[0191] The bit error rate to which the variable component needs to be modulated;

[0192] The bit error rate to which the variable component needs to be modulated;

[0193] The symbol error rate to which the variable component needs to be modulated;

[0194] The block error rate to which the variable component needs to be modulated;

[0195] QoS information of the second device.

[0196] Optionally, the first device determines the invariant component according to a performance indicator that the second signal needs to meet, including:

[0197] The first device determines the invariant component according to a phase compensation parameter and a performance indicator that the second signal needs to meet;

[0198] The phase compensation parameters are determined by channel response related parameters of a first link and channel response related parameters of a second link, the first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0199] In this implementation, after aligning the channel phase, the first device can determine the invariant component according to the performance index that the second signal needs to meet. For the convenience of description, the phase compensation parameter can be expressed as The channel response parameter of the first link can be expressed as h, and the channel response parameter of the second link can be expressed as g, where,

[0200] In this implementation, by aligning the channel phase, the phase compensation parameter will only affect the angle but will not affect the signal energy, thereby ensuring that the energy constraints of the invariant component and the variable component remain unchanged.

[0201] Optionally, the first device determines the invariant component according to a phase compensation parameter and a performance indicator that the second signal needs to meet, including:

[0202] The first device determines the invariant component according to the minimum Euclidean distance between the original constellation points, the phase compensation parameter, and the minimum Euclidean distance to which the constellation points of the second signal need to be modulated.

[0203] Optionally, the first device determines the variable component according to a performance indicator that the variable component needs to meet, the invariant component, and a maximum transmission energy limit parameter of the second device, including:

[0204] The first device determines a feasible region of the variable component according to the invariant component and a maximum transmission energy limit parameter of the second device;

[0205] The first device determines the variable component according to a performance indicator that the variable component needs to meet, a feasible domain of the variable component, and a reference constellation pattern.

[0206] The reference constellation pattern may be a constellation pattern agreed upon by the protocol, or a common constellation pattern (such as a standard constellation pattern) or an existing constellation pattern in the NR system. The reference constellation pattern may be determined by the modulation mode and the modulation order.

[0207] When the first device is a radio frequency signal transmitter, the first device may determine the first information through the received channel information (ie, the second information and the third information below). The signaling interaction involved in determining the first information is described below.

[0208] Optionally, the first device is the radio frequency signal transmitting end;

[0209] The method further comprises:

[0210] The first device receives second information from the second device, where the second information is used by the first device to determine the variable component, and the second information includes at least one of the following:

[0211] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0212] a modulation mode that the second device expects to use;

[0213] the maximum transmit power of the second device;

[0214] QoS information of the second device.

[0215] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0216] Optionally, the method further comprises:

[0217] The first device receives third information from the third device, where the third information is used by the first device to determine the invariant component, and the third information includes at least one of the following:

[0218] Channel response related parameters of the first link;

[0219] Channel response related parameters of the second link;

[0220] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0221] Phase compensation parameters

[0222] A channel response ratio related parameter between the first link and the second link.

[0223] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0224] or,

[0225] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0226] or,

[0227] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0228] or,

[0229] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0230] Optionally, it also includes:

[0231] The first device sends fourth information to the second device, where the fourth information includes:

[0232] A channel response ratio related parameter between the first link and the second link.

[0233] That is, in addition to sending the first information to the second device, the first device can also send the fourth information to the second device. The first device sends the first information and the fourth information to the second device, so that the second device can combine the first information and the fourth information to better determine the first signal to be sent.

[0234] The first device may send the first information and the fourth information to the second device in the same signaling or through different signaling, which is not limited in the embodiment of the present application.

[0235] The above is the signaling interaction involved in determining the first information. It can be seen from the above signaling interaction that the embodiment of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0236] Optionally, the first device is the radio frequency signal transmitting end;

[0237] The method further comprises:

[0238] The first device receives fifth information from the third device, where the fifth information includes at least one of bit information carried by the second signal and bit information carried by the first signal.

[0239] As described above, the third device demodulates the received signal to obtain the first signal and the second signal, and performs bit mapping on the first signal and the second signal respectively to obtain the bit information carried by the second signal (i.e., the bit data stream of the primary link) and the bit information carried by the first signal (i.e., the bit data stream of the secondary link). The third device can further send the demodulation result to the first device.

[0240] The symbiotic communication system of the embodiment of the present application may be, for example, Fig. 9 The symbiotic communication system shown in Figure 1 is shown in Figure 2. Fig. 9 As shown, the first device sends a second signal to the BSC device (ie, the second device) and the third device, the BSC device reflects the second signal to the third device and loads its own information (ie, the first signal), and the third device jointly demodulates the information sent by the first device and the information sent by the BSC device.

[0241] The first device and the third device may be a base station, a UE or a dedicated reader / writer.

[0242] The BSC device can be a traditional RFID Tag, a passive device, a semi-passive device or an active IoT device, etc. In the case where the BSC device is a passive device, it has no energy storage capacitor / battery, relies on RF signals for energy supply (the received RF signal is the power signal of the rectifier), does not have the ability to generate carrier waves, and has the lowest power consumption; in the case where the BSC device is a semi-passive device, it has energy storage capacitors / batteries, relies on non-RF signals for energy supply, and optionally has PA / LNA or other active devices, does not have the ability to generate carrier waves, and has the second highest power consumption; in the case where the BSC device is an active device, it has energy storage capacitors / batteries, relies on non-RF signals for energy supply, has the ability to generate carrier waves, and has the highest power consumption. The above classification of BSC devices is not unique and definite, and only the possible classification characteristics of each BSC device are given here.

[0243] The following example of signaling interaction process is further provided:

[0244] Step a: The third device sends information b (i.e., third information) to the first device, where the information b includes at least one of the following channel information:

[0245] A direct link channel h from the first device to the third device, or ||h|| p (p denotes the p-norm), or

[0246] The backscatter link cascade channel g from the first device to the third device via the BSC device, or ||g|| p ,or

[0247] The backscatter link portion of channel g2 from the BSC device to the third device, or ||g2|| p ,or

[0248] h / g, or ||h / g|| p ,or or

[0249] Step b: The BSC device sends information b (i.e., second information) to the first device, where the information b includes at least one of the following information:

[0250] The backscatter link portion channel g1 from the first device to the BSC device, or ||g1|| p ,or

[0251] The modulation mode that the BSC device expects to use includes at least one of a modulation order and a constellation pattern;

[0252] Maximum transmit power of BSC equipment;

[0253] QoS information of BSC equipment, such as bit error rate, rate, and minimum Euclidean distance.

[0254] Step c: The first device sends information c (which may include the first information and the fourth information) to the BSC device, where the information c includes at least one of the following information:

[0255] The angle of h / g (phase compensation value of cooperative modulation), that is or

[0256] The invariant symbol α in cooperative modulation, or or

[0257] Time-varying symbols in cooperative modulation The constellation diagram includes at least one of the following information:

[0258] Modulation order;

[0259] A reference constellation pattern, such as a standard QPSK constellation modulo 1;

[0260] A factor for scaling or rotating the reference constellation pattern, such as scaling the standard constellation pattern by a factor of l to satisfy the power constraint;

[0261] Bit mapping rules for constellation patterns;

[0262] The transformed constellation pattern.

[0263] Step d: The first device sends information d (i.e., first information) to the third device, where the information d includes at least one of the following information:

[0264] The invariant symbol a in cooperative modulation;

[0265] Time-varying symbols in cooperative modulation The constellation diagram includes at least one of the following information:

[0266] Modulation order;

[0267] A reference constellation pattern, such as a standard QPSK constellation pattern modulo 1;

[0268] A factor for scaling or rotating the reference constellation pattern, such as scaling the standard constellation pattern by a factor of l to satisfy the power constraint;

[0269] Bit mapping rules for constellation patterns;

[0270] The transformed constellation pattern.

[0271] Step e: The third device sends information e (i.e., fifth information) to the first device, where the information e includes at least one of the following information:

[0272] The bit information carried by the main link symbol;

[0273] The bit information carried by the secondary link symbol.

[0274] In order to better understand the technical solution of the embodiment of the present application, the embodiment of the present application is supplemented as follows:

[0275] The main idea of ​​the embodiment of the present application is to determine the time-invariant symbol energy used to enhance the second signal in the collaborative modulation and the constellation pattern of the random symbol used to carry the BSC device's own information. As an example, after aligning the channel phase, the time-invariant symbol energy in the collaborative modulation is determined according to the performance constraint and the maximum transmission energy limit of the primary link symbol, and then the constellation pattern of the random symbol used to carry the BSC device's own information is determined according to the secondary link performance constraint and the maximum transmission energy limit. The specific design process is provided below:

[0276] Similarly, under the variable definition of the aforementioned “cooperative modulation scheme for symbiotic communication”, the composite signal (the received symbol at the RF signal receiving end) can be written as

[0277]

[0278] Among them, α(n) is a time-invariant symbol used to enhance the first signal, or a symbol that assists the main link communication, and β(n) is a random symbol used to carry the BSC device's own information, or a symbol that carries the secondary link information. Moreover, ||α(n)+β(n)||≤C, C is a constant, and its size is determined by the characteristics of the BSC device itself. For a purely passive BSC device, it only attenuates the incident signal, so C≤1; for a semi-passive or active BSC device, the incident signal can be amplified, so C can be greater than 1.

[0279] After aligning the phase of the BSC equipment and the channel, α(n)+β(n) can be rewritten as

[0280]

[0281] Wherein, α is a time-invariant real number symbol used to assist the main link communication, and its angle is consistent with h / g; It is a symbol used to carry the BSC equipment's own information and is a complex number that varies with the information to be sent.

[0282] Note that in formula (11) The modulus is always 1, which only affects the angle and does not affect the signal energy. It can be recorded as Therefore, we can get the following about α and Energy constraints: According to the above definition, formula (10) can be rewritten as follows:

[0283]

[0284] Next, α and α can be designed according to the performance constraints on the primary link symbol (i.e., the performance index that the second signal needs to meet) and the performance constraints on the secondary link symbol (i.e., the performance index that the variable component needs to meet). The following provides specific examples for the performance constraints of the primary link symbol and the performance constraints of the secondary link symbol:

[0285] (1) Performance constraints on main link symbols: The minimum Euclidean distance of the constellation center of the main link symbol is greater than or equal to c1, and the size of c1 can be pre-agreed.

[0286] Specifically, assuming that the minimum Euclidean distance of the original constellation point of the main link symbol is d, then after the cooperative modulation scheme, the minimum Euclidean distance of the constellation center of the composite signal received at the receiving end will become d′, where d′ is related to ||h / g||2, d and the main link symbol constellation. For example, for the QPSK constellation, When other parameters are known, the minimum α that makes d′≥c1 can be obtained, denoted as α * (Assume that there is a solution when α≤C)

[0287] It should be noted that the secondary link symbols are random. Therefore, corresponding to the same primary link symbol, after collaborative modulation, the symbol received by the receiving end is a random one of multiple constellation points centered on the original transmitted symbol of the main link. Therefore, the minimum Euclidean distance considered is the minimum Euclidean distance between the center points of the constellation.

[0288] (2) Performance constraints on secondary link symbols: including modulation order and minimum Euclidean distance constraints of constellation points.

[0289] In getting α * After that, the maximum energy of the secondary link symbol constellation point is also determined accordingly, that is, In order to maximize the Euclidean distance between constellation points, the PSK constellation with the required modulation order can be directly selected. For example, when the required modulation order is M, the M-PSK constellation can be selected; or, the M-quadrature amplitude modulation (M-QAM) constellation or any other constellation can be selected, but its maximum symbol energy cannot exceed C-α * ,To this end, the original constellation can be scaled accordingly according to the energy constraint.

[0290] Figure 10a to Figure 10bThe figure shows the case where both the primary link and the secondary link constellations are QPSK. For ease of presentation, the constellation points in the figure all pass through , s0, ..., s3 and c0, ..., c3 represent the constellation points of the primary link and secondary link signals respectively. Fig.10a is the constellation pattern of the main link signal, Fig.10b is the constellation pattern of the transmission symbol of the secondary link when the primary link symbol is s1. It can be seen that the signals transmitted by the secondary link are all obtained by multiplying s1 and the QPSK constellation point.

[0291] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0292] The information determination method provided in the embodiment of the present application can be executed by an information determination device. In the embodiment of the present application, the information determination device provided in the embodiment of the present application is described by taking the information determination method executed by the information determination device as an example.

[0293] Reference Fig.11 , the embodiment of the present application also provides an information determination device, which can be applied to the first device. Fig.11 As shown, the information determination device 1100 includes:

[0294] The determination module 1101 is used to determine first information, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0295] A first sending module 1102, configured to send the first information to at least one of the second device and the third device;

[0296] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0297] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0298] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0299] Optionally, the determining module 1101 is specifically configured to:

[0300] The constant component and the variable component are determined according to the performance index that the second signal needs to meet, the performance index that the variable component needs to meet, and the maximum transmission energy limit parameter of the second device.

[0301] Optionally, the determining module 1101 includes:

[0302] A first determining unit is configured to determine the invariant component according to a performance indicator that the second signal needs to satisfy; and

[0303] The second determining unit is used to determine the variable component according to the performance indicator that the variable component needs to meet, the invariant component and the maximum transmission energy limit parameter of the second device.

[0304] Optionally, the first determining unit is specifically configured to:

[0305] Determining the invariant component according to a phase compensation parameter and a performance indicator that the second signal needs to meet;

[0306] The phase compensation parameters are determined by channel response related parameters of a first link and channel response related parameters of a second link, the first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0307] Optionally, the performance indicator that the second signal needs to meet includes at least one of the following:

[0308] The minimum Euclidean distance to which the constellation points of the second signal need to be modulated;

[0309] The bit error rate to which the second signal needs to be modulated;

[0310] The bit error rate to which the second signal needs to be modulated;

[0311] A symbol error rate to which the second signal needs to be modulated;

[0312] The block error rate to which the second signal needs to be modulated.

[0313] Optionally, the second determining unit is specifically configured to:

[0314] The first device determines the invariant component according to the minimum Euclidean distance between the original constellation points, the phase compensation parameter, and the minimum Euclidean distance to which the constellation points of the second signal need to be modulated.

[0315] Optionally, the second determining unit is specifically configured to:

[0316] The first device determines a feasible region of the variable component according to the invariant component and a maximum transmission energy limit parameter of the second device;

[0317] The first device determines the variable component according to a performance indicator that the variable component needs to meet, a feasible domain of the variable component, and a reference constellation pattern.

[0318] Optionally, the performance index that the variable component needs to meet includes at least one of the following:

[0319] The minimum Euclidean distance to which the constellation points of the variable components need to be modulated;

[0320] The bit error rate to which the variable component needs to be modulated;

[0321] The bit error rate to which the variable component needs to be modulated;

[0322] The symbol error rate to which the variable component needs to be modulated;

[0323] The block error rate to which the variable component needs to be modulated;

[0324] QoS information of the second device.

[0325] Optionally, the first device is the radio frequency signal transmitting end;

[0326] The information determining device 1100 further includes:

[0327] A first receiving module is configured to receive second information from the second device, where the second information is used by the first device to determine the variable component, and the second information includes at least one of the following:

[0328] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0329] a modulation mode that the second device expects to use;

[0330] the maximum transmit power of the second device;

[0331] QoS information of the second device.

[0332] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0333] Optionally, the information determining device 1100 further includes:

[0334] The second receiving module is configured to receive third information from the third device, where the third information is used by the first device to determine the invariant component, and the third information includes at least one of the following:

[0335] Channel response related parameters of the first link;

[0336] Channel response related parameters of the second link;

[0337] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0338] Phase compensation parameters

[0339] A channel response ratio related parameter between the first link and the second link.

[0340] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0341] or,

[0342] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0343] or,

[0344] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0345] or,

[0346] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0347] Optionally, the information determining device 1100 further includes:

[0348] The second sending module is configured to send fourth information to the second device, where the fourth information includes:

[0349] A channel response ratio related parameter between the first link and the second link.

[0350] Optionally, the first device is the radio frequency signal transmitting end;

[0351] The information determining device 1100 further includes:

[0352] The third receiving module is used to receive fifth information from the third device, where the fifth information includes at least one of the bit information carried by the second signal and the bit information carried by the first signal.

[0353] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0354] Refer to the constellation pattern;

[0355] a modulation order of the first signal;

[0356] A factor by which the reference constellation pattern is scaled or rotated.

[0357] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0358] The information determination device 1100 in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or a network side device. For example, the terminal may include but is not limited to the types of the terminal 11 listed above, and the network side device may include but is not limited to the types of the network side device 12 listed above, which are not specifically limited in the embodiment of the present application.

[0359] The information determination device 1100 provided in the embodiment of the present application can implement each process implemented by the first device side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0360] Fig.12 FIG. 1 is a flow chart of a signal determination method provided by an embodiment of the present application. Fig.12 As shown, the signal determination method includes the following steps:

[0361] Step 1201: a second device receives first information from a first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0362] Step 1202: The second device determines a first constellation pattern according to the first information;

[0363] Step 1203: The second device sends the first signal to one of the first device and the third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern;

[0364] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0365] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0366] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0367] Optionally, the second device sending the first signal to one of the first device and the third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern includes:

[0368] The second device selects a first constellation point from the constellation points of the first constellation pattern according to the bit mapping rule of the first constellation pattern and the information sent by itself;

[0369] The second device determines a first impedance according to the first constellation point, and sends the first signal using the first impedance;

[0370] The first signal is a signal generated by the second device based on backscattering of the second signal.

[0371] Optionally, the second device sending the first signal to one of the first device and the third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern includes:

[0372] The second device determines the variable component according to the first constellation pattern, the bit mapping rule of the first constellation pattern and the information sent by itself.

[0373] The second device converts the variable component and the constant component α and Perform operations and get

[0374] The second device will Modulate the second signal to obtain the first signal.

[0375] It should be noted that in the backscatter communication technology, the signal is sent while being modulated, that is, the second device By modulating to the second signal, the sending of the first signal is realized.

[0376] Optionally, the first device is the radio frequency signal transmitting end;

[0377] The method further comprises:

[0378] The second device sends second information to the first device, where the second information is used to determine the variable component, and the second information includes at least one of the following:

[0379] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0380] a modulation mode that the second device expects to use;

[0381] the maximum transmit power of the second device;

[0382] QoS information of the second device.

[0383] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0384] Optionally, it also includes:

[0385] The second device receives fourth information from the first device, where the fourth information includes:

[0386] Channel response ratio related parameters of the first link and the second link;

[0387] The first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0388] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0389] Refer to the constellation pattern;

[0390] a modulation order of the first signal;

[0391] A factor for scaling or rotating the reference constellation pattern.

[0392] The embodiments of the present application relate to a cooperative modulation scheme for symbiotic communication, and the second device can be understood as a modulation end of the symbiotic communication system. Specific embodiments are provided below to illustrate the operation of the cooperative modulation scheme at the modulation end.

[0393] like Fig.13 As shown, after the bit data stream to be sent undergoes channel coding and symbol mapping, it is obtained Add it to the constant symbol α and then sum Multiply them together and you get Finally, it is multiplied by the incident symbol s(n) to obtain the final transmitted symbol. It is known information obtained by the BSC device from the first device or the third device, and its specific value can be determined through the first device side method embodiment.

[0394] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0395] The signal determination method provided in the embodiment of the present application may be executed by a signal determination device. In the embodiment of the present application, the signal determination device provided in the embodiment of the present application is described by taking the signal determination method executed by the signal determination device as an example.

[0396] Reference Fig.14 , the embodiment of the present application also provides a signal determination device, which can be applied to the second device. Fig.14 As shown, the signal determination device 1400 includes:

[0397] The first receiving module 1401 is used to receive first information from a first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0398] A determination module 1402 is configured to determine a first constellation pattern according to the first information;

[0399] A first sending module 1403, configured to send the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern;

[0400] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0401] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0402] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0403] Optionally, the sending module 1403 includes:

[0404] A selection unit, configured to select a first constellation point from the constellation points of the first constellation pattern according to a bit mapping rule of the first constellation pattern and its own transmission information;

[0405] a determining unit, configured to determine a first impedance according to the first constellation point;

[0406] a sending unit, configured to send the first signal using the first impedance;

[0407] The first signal is a signal generated by the second device based on backscattering of the second signal.

[0408] Optionally, the sending module 1403 includes:

[0409] a determining unit, configured to determine a variable component according to the first constellation pattern, a bit mapping rule of the first constellation pattern and its own transmission information

[0410] Operation unit, used to convert variable components and the constant component α and Perform operations and get

[0411] Modulation unit, used to Modulate the second signal to obtain the first signal.

[0412] Optionally, the first device is the radio frequency signal transmitting end;

[0413] The signal determination device 1400 further includes:

[0414] A second sending module is configured to send second information to the first device, where the second information is used to determine the variable component, and the second information includes at least one of the following:

[0415] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0416] a modulation mode that the second device expects to use;

[0417] the maximum transmit power of the second device;

[0418] QoS information of the second device.

[0419] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0420] Optionally, the signal determining device 1400 further includes:

[0421] The second receiving module is configured to receive fourth information from the first device, where the fourth information includes:

[0422] Channel response ratio related parameters of the first link and the second link;

[0423] The first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0424] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0425] Refer to the constellation pattern;

[0426] a modulation order of the first signal;

[0427] A factor for scaling or rotating the reference constellation pattern.

[0428] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0429] The signal determination device 1400 in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or a network side device. For example, the terminal may include but is not limited to the types of the terminal 11 listed above, and the network side device may include but is not limited to the types of the network side device 12 listed above, which are not specifically limited in the embodiment of the present application.

[0430] The signal determination device 1400 provided in the embodiment of the present application can implement each process implemented by the second device side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0431] Fig.15 FIG. 1 is a flow chart of a signal demodulation method provided by an embodiment of the present application. Fig.15 As shown, the signal demodulation method comprises the following steps:

[0432] Step 1501: a third device receives first information from a first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0433] Step 1502: The third device processes the received third signal according to the first information to demodulate the second signal and the variable component from the third signal;

[0434] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0435] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0436] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0437] Optionally, the third device processes the received third signal according to the first information to demodulate the second signal and the variable component from the third signal, including:

[0438] The third device determines the second signal based on the following formula:

[0439]

[0440] Wherein, x(n) is the third signal, represents a set of all possible constellation points of a first link, where the first link is a direct link between the radio frequency signal transmitting end and the radio frequency signal receiving end;

[0441] The third device deletes the determined second signal from the third signal, and determines a remaining signal x′(n) containing the self information of the second device;

[0442] The third device determines the variable component in the first signal based on the following formula:

[0443]

[0444] in, Represents the set of all possible constellation points of the variable components.

[0445] Optionally, the first device is the radio frequency signal transmitting end;

[0446] The method further comprises:

[0447] The third device sends third information to the first device, where the third information is used to determine the invariant component, and the third information includes at least one of the following:

[0448] a channel response-related parameter of a first link, where the first link is a direct link between the first device and the third device;

[0449] a channel response-related parameter of a second link, where the second link is a backscatter link from the first device to the third device via the second device;

[0450] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0451] Phase compensation parameters

[0452] A channel response ratio related parameter between the first link and the second link.

[0453] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0454] or,

[0455] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0456] or,

[0457] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0458] or,

[0459] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0460] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0461] Refer to the constellation pattern;

[0462] a modulation order of the first signal;

[0463] A factor for scaling or rotating the reference constellation pattern.

[0464] The embodiments of the present application relate to a cooperative modulation scheme for symbiotic communication, and the third device can be understood as a demodulation end of the symbiotic communication system. Specific embodiments are provided below to illustrate the operation of the cooperative modulation scheme at the demodulation end.

[0465] Fig.16 A demodulation schematic diagram of cooperative modulation is shown, the basic idea of ​​which is Successive Interference Cancellation (SIC).

[0466] by Fig.10a and Fig.10b Taking the case where both the primary and secondary links are QPSK as an example, the receiving symbol constellation pattern obtained by the receiving end (i.e., the third device) is as follows Fig.17 As shown. It can be seen that the received composite symbol is actually multiple constellation points scattered in 4 areas, each area is centered on s′0,...,s3′, corresponding to the 4 modulation symbols s0,...,s3 of the main link. Therefore, the receiving end can first determine the symbol of the main link. A feasible determination method is:

[0467]

[0468] Where x(n) is the received composite signal, represents the set of all possible constellation points of the primary link. In this example,

[0469] After obtaining the main link symbol estimate, delete it from the received signal (first and Multiply it and then remove it from the received signal) to get the secondary link symbol The remaining signal x′(n) is obtained, and then the secondary link symbol is judged. A feasible judgment method is:

[0470]

[0471] in, represents the set of all possible constellation points of the primary link. In this example,

[0472] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0473] The signal demodulation method provided in the embodiment of the present application can be executed by a signal demodulation device. In the embodiment of the present application, the signal demodulation device provided in the embodiment of the present application is described by taking the signal demodulation method executed by the signal demodulation device as an example.

[0474] Reference Fig.18 , the embodiment of the present application also provides a signal demodulation device, which can be applied to a third device. Fig.18 As shown, the signal demodulation device 1800 includes:

[0475] The receiving module 1801 is used to receive first information from a first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0476] A demodulation module 1802, configured to process the received third signal according to the first information, so as to demodulate the second signal and the variable component from the third signal;

[0477] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0478] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0479] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0480] Optionally, the demodulation module 1802 includes:

[0481] The first determining unit is configured to determine the second signal based on the following formula:

[0482]

[0483] Wherein, x(n) is the third signal, represents a set of all possible constellation points of a first link, where the first link is a direct link between the radio frequency signal transmitting end and the radio frequency signal receiving end;

[0484] A second determining unit, configured to delete the determined second signal from the third signal, and determine a remaining signal x′(n) containing the self information of the second device;

[0485] The third determining unit is configured to determine the variable component in the first signal based on the following formula:

[0486]

[0487] in, Represents the set of all possible constellation points of the variable components.

[0488] Optionally, the first device is the radio frequency signal transmitting end;

[0489] The signal demodulation device 1800 further includes:

[0490] A sending module, configured to send third information to the first device, where the third information is used to determine the invariant component, and the third information includes at least one of the following:

[0491] a channel response-related parameter of a first link, where the first link is a direct link between the first device and the third device;

[0492] a channel response-related parameter of a second link, where the second link is a backscatter link from the first device to the third device via the second device;

[0493] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0494] Phase compensation parameters

[0495] A channel response ratio related parameter between the first link and the second link.

[0496] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0497] or,

[0498] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0499] or,

[0500] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0501] or,

[0502] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0503] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0504] Refer to the constellation pattern;

[0505] a modulation order of the first signal;

[0506] A factor for scaling or rotating the reference constellation pattern.

[0507] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0508] The signal determination device 1800 in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or a network side device. For example, the terminal may include but is not limited to the types of the terminal 11 listed above, and the network side device may include but is not limited to the types of the network side device 12 listed above, which are not specifically limited in the embodiment of the present application.

[0509] The signal determination device 1800 provided in the embodiment of the present application can implement each process implemented by the third device side method embodiment and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0510] Alternatively, if Fig.19 As shown, an embodiment of the present application further provides a communication device 1900, including a processor 1901 and a memory 1902, and the memory 1902 stores a program or instruction that can be run on the processor 1901. For example, when the communication device 1900 is a first device, the program or instruction is executed by the processor 1901 to implement the various steps of the above-mentioned information determination method embodiment, and can achieve the same technical effect. When the communication device 1900 is a second device, the program or instruction is executed by the processor 1901 to implement the various steps of the above-mentioned signal determination method embodiment, and can achieve the same technical effect. When the communication device 1900 is a third device, the program or instruction is executed by the processor 1901 to implement the various steps of the above-mentioned signal demodulation method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0511] The embodiment of the present application further provides a first device, the first device comprising a processor and a communication interface, wherein the processor is used to: determine first information, the first information is used to determine a constant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the constant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; the communication interface is used to: the first device sends the first information to at least one of the second device and a third device;

[0512] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0513] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0514] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0515] The embodiment of the present application further provides a second device, which includes a processor and a communication interface, wherein the communication interface is used to: receive first information from the first device, the first information is used to determine the constant component and the variable component included in the first constellation pattern, and the bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the constant component is used to enhance the second signal, the variable component is used to carry the second device's own information, the second signal is a carrier signal sent by a radio frequency signal sending end, and the second device is a backscatter communication BSC device; the processor is used to: determine the first constellation pattern according to the first information; the communication interface is also used to: send the first signal to one of the first device and the third device according to the first constellation pattern and the bit mapping rule of the first constellation pattern;

[0516] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0517] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0518] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0519] The embodiment of the present application further provides a third device, which includes a processor and a communication interface, wherein the communication interface is used to: receive first information from a first device, the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; the processor is used to: process the received third signal according to the first information, so as to demodulate the second signal and the variable component from the third signal;

[0520] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0521] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0522] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0523] Each implementation process and implementation method of the above method embodiment can be applied to the terminal and can achieve the same technical effect. Fig. 20 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0524] The terminal 2000 includes but is not limited to: a radio frequency unit 2001, a network module 2002, an audio output unit 2003, an input unit 2004, a sensor 2005, a display unit 2006, a user input unit 2007, an interface unit 2008, a memory 2009 and at least some of the components of the processor 2010.

[0525] Those skilled in the art will appreciate that the terminal 2000 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 2010 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig. 20 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0526] It should be understood that in the embodiment of the present application, the input unit 2004 may include a graphics processing unit (GPU) 20041 and a microphone 20042, and the graphics processor 20041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 2006 may include a display panel 20061, and the display panel 20061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 2007 includes a touch panel 20071 and at least one of other input devices 20072. The touch panel 20071 is also called a touch screen. The touch panel 20071 may include two parts, a touch detection device and a touch controller. Other input devices 20072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0527] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 2001 can transmit the data to the processor 2010 for processing; in addition, the RF unit 2001 can send uplink data to the network side device. Generally, the RF unit 2001 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0528] The memory 2009 can be used to store software programs or instructions and various data. The memory 2009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 2009 may include a volatile memory or a non-volatile memory, or the memory 2009 may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 2009 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0529] The processor 2010 may include one or more processing units; optionally, the processor 2010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 2010.

[0530] Terminal 2000 can execute the steps of the information determination method on the first device side of the embodiment of the present application, the steps of the signal determination method on the second device side of the embodiment of the present application, and the steps of the signal demodulation method on the third device side of the embodiment of the present application.

[0531] On the one hand, the terminal 2000 can perform the following steps as a first device:

[0532] The processor 2010 is used to:

[0533] Determine first information, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0534] The radio frequency unit 2001 is used for:

[0535] sending the first information to at least one of the second device and the third device;

[0536] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0537] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0538] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0539] Optionally, the processor 2010 is further configured to:

[0540] The constant component and the variable component are determined according to the performance index that the second signal needs to meet, the performance index that the variable component needs to meet, and the maximum transmission energy limit parameter of the second device.

[0541] Optionally, the processor 2010 is further configured to:

[0542] used to determine the invariant component according to a performance indicator that the second signal needs to meet; and

[0543] The variable component is determined according to a performance indicator that the variable component needs to meet, the invariant component, and a maximum transmission energy limit parameter of the second device.

[0544] Optionally, the processor 2010 is further configured to:

[0545] Determining the invariant component according to a phase compensation parameter and a performance indicator that the second signal needs to meet;

[0546] The phase compensation parameters are determined by channel response related parameters of a first link and channel response related parameters of a second link, the first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0547] Optionally, the performance indicator that the second signal needs to meet includes at least one of the following:

[0548] The minimum Euclidean distance to which the constellation points of the second signal need to be modulated;

[0549] The bit error rate to which the second signal needs to be modulated;

[0550] The bit error rate to which the second signal needs to be modulated;

[0551] A symbol error rate to which the second signal needs to be modulated;

[0552] The block error rate to which the second signal needs to be modulated.

[0553] Optionally, the processor 2010 is further configured to:

[0554] The invariant component is determined according to the minimum Euclidean distance between the original constellation points, the phase compensation parameter, and the minimum Euclidean distance to which the constellation points of the second signal need to be modulated.

[0555] Optionally, the processor 2010 is further configured to:

[0556] Determining a feasible domain of the variable component according to the invariant component and a maximum transmission energy limit parameter of the second device;

[0557] The variable component is determined according to a performance indicator that the variable component needs to meet, a feasible domain of the variable component, and a reference constellation pattern.

[0558] Optionally, the performance index that the variable component needs to meet includes at least one of the following:

[0559] The minimum Euclidean distance to which the constellation points of the variable components need to be modulated;

[0560] The bit error rate to which the variable component needs to be modulated;

[0561] The bit error rate to which the variable component needs to be modulated;

[0562] The symbol error rate to which the variable component needs to be modulated;

[0563] The block error rate to which the variable component needs to be modulated;

[0564] QoS information of the second device.

[0565] Optionally, the first device is the radio frequency signal transmitting end;

[0566] The radio frequency unit 2001 is also used for:

[0567] receiving second information from the second device, where the second information is used by the first device to determine the variable component, and the second information includes at least one of the following:

[0568] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0569] a modulation mode that the second device expects to use;

[0570] the maximum transmit power of the second device;

[0571] QoS information of the second device.

[0572] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0573] Optionally, the radio frequency unit 2001 is further configured to:

[0574] receiving third information from the third device, where the third information is used by the first device to determine the invariant component, and the third information includes at least one of the following:

[0575] Channel response related parameters of the first link;

[0576] Channel response related parameters of the second link;

[0577] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0578] Phase compensation parameters

[0579] A channel response ratio related parameter between the first link and the second link.

[0580] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0581] or,

[0582] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0583] or,

[0584] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0585] or,

[0586] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0587] Optionally, the radio frequency unit 2001 is further configured to:

[0588] Sending fourth information to the second device, where the fourth information includes:

[0589] A channel response ratio related parameter between the first link and the second link.

[0590] Optionally, the first device is the radio frequency signal transmitting end;

[0591] The radio frequency unit 2001 is also used for:

[0592] Fifth information is received from the third device, where the fifth information includes at least one of the bit information carried by the second signal and the bit information carried by the first signal.

[0593] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0594] Refer to the constellation pattern;

[0595] a modulation order of the first signal;

[0596] A factor for scaling or rotating the reference constellation pattern.

[0597] On the other hand, the terminal 2000 can perform the following steps as the second device:

[0598] The processor 2010 is used to:

[0599] Determine a first constellation pattern according to the first information;

[0600] The radio frequency unit 2001 is used for:

[0601] sending the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern;

[0602] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0603] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0604] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0605] Optionally, the processor 2010 is further configured to:

[0606] Selecting a first constellation point from the constellation points of the first constellation pattern according to a bit mapping rule of the first constellation pattern and the self-transmitted information;

[0607] determining a first impedance according to the first constellation point;

[0608] The radio frequency unit 2001 is also used for:

[0609] sending the first signal using the first impedance;

[0610] The first signal is a signal generated by the second device based on backscattering of the second signal.

[0611] Optionally, the processor 2010 is further configured to:

[0612] Determine the variable component according to the first constellation pattern, the bit mapping rule of the first constellation pattern and the self-transmitted information

[0613] The variable component and the constant component α and Perform operations and get

[0614] Will Modulate the second signal to obtain the first signal.

[0615] Optionally, the first device is the radio frequency signal transmitting end;

[0616] The radio frequency unit 2001 is also used for:

[0617] Sending second information to the first device, where the second information is used to determine the variable component, and the second information includes at least one of the following:

[0618] a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device;

[0619] a modulation mode that the second device expects to use;

[0620] the maximum transmit power of the second device;

[0621] QoS information of the second device.

[0622] Optionally, the channel response related parameters of the third link include channel response related parameters g1, ||g1|| of the third link. p or Among them, ||·|| p represents the p-norm.

[0623] Optionally, the radio frequency unit 2001 is further configured to:

[0624] receiving fourth information from the first device, the fourth information comprising:

[0625] Channel response ratio related parameters of the first link and the second link;

[0626] The first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

[0627] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0628] Refer to the constellation pattern;

[0629] a modulation order of the first signal;

[0630] A factor for scaling or rotating the reference constellation pattern.

[0631] On the other hand, the terminal 2000 can perform the following steps as a third device:

[0632] The radio frequency unit 2001 is used for:

[0633] Receive first information from a first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device;

[0634] The processor 2010 is used to:

[0635] Processing the received third signal according to the first information to demodulate the second signal and the variable component from the third signal;

[0636] Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end;

[0637] In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end;

[0638] In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

[0639] Optionally, the processor 2010 is configured to:

[0640] The second signal is determined based on the following formula:

[0641]

[0642] Wherein, x(n) is the third signal, represents a set of all possible constellation points of a first link, where the first link is a direct link between the radio frequency signal transmitting end and the radio frequency signal receiving end;

[0643] Deleting the determined second signal from the third signal to determine a remaining signal x′(n) containing the self information of the second device;

[0644] The variable component in the first signal is determined based on the following formula:

[0645]

[0646] in, Represents the set of all possible constellation points of the variable components.

[0647] Optionally, the first device is the radio frequency signal transmitting end;

[0648] The radio frequency unit 2001 is also used for:

[0649] Sending third information to the first device, where the third information is used to determine the invariant component, and the third information includes at least one of the following:

[0650] a channel response-related parameter of a first link, where the first link is a direct link between the first device and the third device;

[0651] a channel response-related parameter of a second link, where the second link is a backscatter link from the first device to the third device via the second device;

[0652] a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device;

[0653] Phase compensation parameters

[0654] A channel response ratio related parameter between the first link and the second link.

[0655] Optionally, the channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link. p or Among them, ||·|| p represents the p-norm;

[0656] or,

[0657] The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or

[0658] or,

[0659] The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or

[0660] or,

[0661] The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or

[0662] Optionally, the first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following:

[0663] Refer to the constellation pattern;

[0664] a modulation order of the first signal;

[0665] A factor for scaling or rotating the reference constellation pattern.

[0666] In summary, the embodiments of the present application can not only reduce the design complexity of symbiotic communication cooperative modulation, but also reduce the signaling indication overhead required for symbiotic communication cooperative modulation by adopting phase compensation and a constellation pattern design scheme that is independent of the main link modulation method.

[0667] The various implementation processes and implementation methods of the above method embodiments can also be applied to network-side devices and can achieve the same technical effects. Fig.21 A schematic diagram of the hardware structure of a network side device for implementing an embodiment of the present application. Fig.21 As shown, the network side device 210 includes: an antenna 211, a radio frequency device 212, a baseband device 213, a processor 214 and a memory 215. The antenna 211 is connected to the radio frequency device 212. In the uplink direction, the radio frequency device 212 receives information through the antenna 211 and sends the received information to the baseband device 213 for processing. In the downlink direction, the baseband device 213 processes the information to be sent and sends it to the radio frequency device 212, and the radio frequency device 212 processes the received information and sends it out through the antenna 211.

[0668] The method executed by the first device or the second device in the above embodiments may be implemented in the baseband device 213, which includes a baseband processor.

[0669] The baseband device 213 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.21 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 215 through a bus interface to call the program in the memory 215 to execute the operations performed by the first device or the second device shown in the above method embodiment.

[0670] The network side device may further include a network interface 216, which is, for example, a common public radio interface (CPRI).

[0671] Specifically, the network side device 210 of the embodiment of the present application further includes: instructions or programs stored in the memory 215 and executable on the processor 214, and the processor 214 calls the instructions or programs in the memory 215 to execute. Fig.11 or Fig.14 or Fig.18 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0672] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it implements the various processes of the information determination method embodiment on the first device side, or implements the various processes of the signal determination method embodiment on the second device side, or implements the various processes of the signal demodulation method embodiment on the third device side, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0673] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0674] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the information determination method embodiment on the first device side, or to implement the various processes of the signal determination method embodiment on the second device side, or to implement the various processes of the signal demodulation method embodiment on the second device side, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0675] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0676] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the information determination method embodiment on the first device side, or to implement the various processes of the signal determination method embodiment on the second device side, or to implement the various processes of the signal demodulation method embodiment on the second device side. To avoid repetition, they are not described again here.

[0677] An embodiment of the present application also provides a communication system, including: a first device, a second device and a third device, wherein the first device can be used to execute the steps of the information determination method on the first device side, the second device can be used to execute the steps of the signal determination method on the second device side, and the third device can be used to execute the steps of the signal demodulation method on the third device side.

[0678] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0679] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0680] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for determining information, characterized in that: include: The first device determines first information, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; The first device sends the first information to at least one of the second device and a third device; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

2. The method according to claim 1, characterized in that: The first device determines the first information, including: The first device determines the constant component and the variable component according to a performance indicator that the second signal needs to meet, a performance indicator that the variable component needs to meet, and a maximum transmission energy limit parameter of the second device.

3. The method according to claim 2, characterized in that The first device determines the constant component and the variable component according to a performance indicator that the second signal needs to meet, a performance indicator that the variable component needs to meet, and a maximum transmission energy limit parameter of the second device, including: The first device determines the invariant component according to a performance indicator that the second signal needs to meet; and The first device determines the variable component according to a performance indicator that the variable component needs to meet, the invariant component, and a maximum transmission energy limit parameter of the second device.

4. The method according to claim 3, characterized in that: The first device determines the invariant component according to a performance indicator that the second signal needs to meet, including: The first device determines the invariant component according to a phase compensation parameter and a performance indicator that the second signal needs to meet; The phase compensation parameters are determined by channel response related parameters of a first link and channel response related parameters of a second link, the first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

5. The method according to any one of claims 2 to 4, characterized in that The performance indicator that the second signal needs to meet includes at least one of the following: The minimum Euclidean distance to which the constellation points of the second signal need to be modulated; The bit error rate to which the second signal needs to be modulated; The bit error rate to which the second signal needs to be modulated; A symbol error rate to which the second signal needs to be modulated; The block error rate to which the second signal needs to be modulated.

6. The method according to claim 5, characterized in that The first device determines the invariant component according to the phase compensation parameter and the performance index that the second signal needs to meet, including: The first device determines the invariant component according to the minimum Euclidean distance between the original constellation points, the phase compensation parameter, and the minimum Euclidean distance to which the constellation points of the second signal need to be modulated.

7. The method according to any one of claims 2 to 6, characterized in that The first device determines the variable component according to the performance indicator that the variable component needs to meet, the invariant component, and the maximum transmission energy limit parameter of the second device, including: The first device determines a feasible region of the variable component according to the invariant component and a maximum transmission energy limit parameter of the second device; The first device determines the variable component according to a performance indicator that the variable component needs to meet, a feasible domain of the variable component, and a reference constellation pattern.

8. The method according to claim 7, characterized in that The performance indicators that the variable component needs to meet include at least one of the following: The minimum Euclidean distance to which the constellation points of the variable components need to be modulated; The bit error rate to which the variable component needs to be modulated; The bit error rate to which the variable component needs to be modulated; The symbol error rate to which the variable component needs to be modulated; The block error rate to which the variable component needs to be modulated; QoS information of the second device.

9. The method according to any one of claims 1 to 8, characterized in that The first device is the radio frequency signal transmitting end; The method further comprises: The first device receives second information from the second device, where the second information is used by the first device to determine the variable component, and the second information includes at least one of the following: a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device; a modulation mode that the second device expects to use; the maximum transmit power of the second device; QoS information of the second device.

10. The method according to claim 9, characterized in that The channel response related parameters of the third link include the channel response related parameters g1, ||g1|| p or Among them, ||·|| p represents the p-norm.

11. The method according to any one of claims 1 to 10, characterized in that The method further comprises: The first device receives third information from the third device, where the third information is used by the first device to determine the invariant component, and the third information includes at least one of the following: Channel response related parameters of the first link; Channel response related parameters of the second link; a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device; Phase compensation parameters A channel response ratio related parameter between the first link and the second link.

12. The method according to claim 11, characterized in that The channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link p or Among them, ||·|| p represents the p-norm; or, The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or or, The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or or, The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or 13. The method according to claim 11 or 12, characterized in that: Also includes: The first device sends fourth information to the second device, where the fourth information includes: A channel response ratio related parameter between the first link and the second link.

14. The method according to any one of claims 1 to 13, characterized in that The first device is the radio frequency signal transmitting end; The method further comprises: The first device receives fifth information from the third device, where the fifth information includes at least one of bit information carried by the second signal and bit information carried by the first signal.

15. The method according to any one of claims 1 to 14, characterized in that The first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following: Refer to the constellation pattern; a modulation order of the first signal; A factor for scaling or rotating the reference constellation pattern.

16. A signal determination method, characterized in that: include: The second device receives first information from the first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; The second device determines a first constellation pattern according to the first information; The second device sends the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

17. The method according to claim 16, characterized in that The second device sending the first signal to one of the first device and the third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern includes: The second device selects a first constellation point from the constellation points of the first constellation pattern according to the bit mapping rule of the first constellation pattern and the information sent by itself; The second device determines a first impedance according to the first constellation point, and sends the first signal using the first impedance; The first signal is a signal generated by the second device based on backscattering of the second signal.

18. The method according to claim 16, characterized in that The second device sending the first signal to one of the first device and the third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern includes: The second device determines the variable component according to the first constellation pattern, the bit mapping rule of the first constellation pattern and the information sent by itself. The second device converts the variable component and the constant component α and Perform operations and get The second device will Modulate the second signal to obtain the first signal.

19. The method according to any one of claims 15 to 18, characterized in that The first device is the radio frequency signal transmitting end; The method further comprises: The second device sends second information to the first device, where the second information is used to determine the variable component, and the second information includes at least one of the following: a channel response-related parameter of a third link, where the third link is a backscatter link from the first device to the second device; a modulation mode that the second device expects to use; the maximum transmit power of the second device; QoS information of the second device.

20. The method according to claim 19, characterized in that The channel response related parameters of the third link include the channel response related parameters g1, ||g1|| p or 21. The method according to any one of claims 15 to 20, characterized in that Also includes: The second device receives fourth information from the first device, where the fourth information includes: A channel response ratio h / g between the first link and the second link; The first link is a direct link between the RF signal transmitting end and the RF signal receiving end, and the second link is a backscatter link from the RF signal transmitting end to the RF signal receiving end via the second device.

22. The method according to any one of claims 15 to 21, characterized in that The first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following: Refer to the constellation pattern; a modulation order of the first signal; A factor for scaling or rotating the reference constellation pattern.

23. A signal demodulation method, characterized in that: include: The third device receives first information from the first device, where the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; The third device processes the received third signal according to the first information to demodulate the second signal and the variable component from the third signal; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

24. The method according to claim 23, characterized in that The third device processes the received third signal according to the first information to demodulate the second signal and the variable component from the third signal, including: The third device determines the second signal based on the following formula: Wherein, x(n) is the third signal, A s represents a set of all possible constellation points of a first link, where the first link is a direct link between the radio frequency signal transmitting end and the radio frequency signal receiving end; The third device deletes the determined second signal from the third signal, and determines a remaining signal x′(n) containing the self information of the second device; The third device determines the variable component in the first signal based on the following formula: Among them, A c Represents the set of all possible constellation points of the variable components.

25. The method according to claim 23 or 24, characterized in that The first device is the radio frequency signal transmitting end; The method further comprises: The third device sends third information to the first device, where the third information is used to determine the invariant component, and the third information includes at least one of the following: a channel response-related parameter of a first link, where the first link is a direct link between the first device and the third device; a channel response-related parameter of a second link, where the second link is a backscatter link from the first device to the third device via the second device; a channel response-related parameter of a fourth link, wherein the fourth link is a backscatter link from the second device to the third device; Phase compensation parameters A channel response ratio related parameter between the first link and the second link.

26. The method according to claim 25, characterized in that The channel response related parameters of the first link include the channel response parameters h, ||h|| of the first link p or Among them, ||·|| p represents the p-norm; or, The channel response related parameters of the second link include the channel response parameters g of the second link, ||g|| p or or, The channel response related parameters of the fourth link include the channel response parameters g2, ||g2|| of the fourth link. p or or, The channel response ratio-related parameters of the first link and the second link include the channel response ratio of the first link and the second link h / g, ||h / g|| p , or 27. The method according to any one of claims 23 to 26, characterized in that The first information includes target information for characterizing the first constellation pattern, and the target information includes any two or more of the following: Refer to the constellation pattern; a modulation order of the first signal; A factor for scaling or rotating the reference constellation pattern.

28. An information determination device, applied to a first device, characterized in that: The device comprises: A determination module, configured to determine first information, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of a second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; A first sending module, configured to send the first information to at least one of the second device and the third device; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

29. A signal determination device, applied to a second device, characterized in that: The device comprises: A first receiving module, configured to receive first information from a first device, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; A determination module, configured to determine a first constellation pattern according to the first information; a sending module, configured to send the first signal to one of the first device and a third device according to the first constellation pattern and a bit mapping rule of the first constellation pattern; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

30. A signal demodulation device, applied to a third device, characterized in that: The device comprises: A receiving module, configured to receive first information from a first device, wherein the first information is used to determine an invariant component and a variable component included in a first constellation pattern, and a bit mapping rule of the first constellation pattern; the first constellation pattern is a constellation pattern used to send a first signal, the invariant component is used to enhance a second signal, the variable component is used to carry self information of the second device, the second signal is a carrier signal sent by a radio frequency signal transmitting end, and the second device is a backscatter communication BSC device; a demodulation module, configured to process the received third signal according to the first information, so as to demodulate the second signal and the variable component from the third signal; Wherein, the first device includes the radio frequency signal transmitting end or the radio frequency signal receiving end; In the case where the first device is the radio frequency signal transmitting end, the third device is the radio frequency signal receiving end; In the case where the first device is the radio frequency signal receiving end, the third device is the radio frequency signal sending end.

31. A communication device, characterized in that: It includes a processor and a memory, the memory storing a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, it implements the steps of the information determination method as described in any one of claims 1 to 15, or implements the steps of the signal determination method as described in any one of claims 16 to 22, or implements the steps of the signal demodulation method as described in any one of claims 23 to 27.

32. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the steps of the information determination method as described in any one of claims 1 to 15, or implements the steps of the signal determination method as described in any one of claims 16 to 22, or implements the steps of the signal demodulation method as described in any one of claims 23 to 27.

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