OOK signal generation method, network device, and storage medium

Abstract

An OOK signal generation method, a network device, and a storage medium, relating to the technical field of terminals. The method comprises: determining a time domain signal segment on each ON chip comprised in an original OOK signal; representing each time domain signal segment by means of a time domain signal sequence, wherein the sequence length of the time domain signal sequence is equal to the sequence length of the corresponding time domain signal segment, and in the time domain signal sequences corresponding to each time domain signal segment, at least two time domain signal sequences have different time domain frequency points, and each time domain frequency point is within a preset transmission bandwidth; cascading each time domain signal sequence with each OFF chip according to a time domain position, so as to acquire a first time domain signal; and generating, by means of using the first time domain signal, an OFDM symbol carrying a first OOK signal. By means of the method, the dynamic range of downlink power allocation is widened, the flexibility of resource allocation on the network device side is improved, and the possibility of causing interference to a signal of a neighboring cell on a specific frequency domain resource is also reduced.

Description

OOK signal generation method, network device and storage medium

[0001] The present application claims priority to the Chinese patent application No. 202411264722.8, filed on September 10, 2024, and entitled "OOK signal generation method, network device and storage medium", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, in particular to an OOK signal generation method, a network device and a storage medium. BACKGROUND

[0003] Ambient IoT, also known as passive IoT, is a kind of IoT network composed of devices with limited or no battery storage capacity. These devices rely on energy collected from the environment for their own power supply, such as solar energy, radio waves, motion, vibration, heat or pressure, etc. Passive IoT technology based on cellular communication can reduce costs by utilizing existing large-scale cellular infrastructure, and can also improve the coverage of passive IoT by utilizing many mature technologies of cellular communication, such as interference management, mobility management, etc.

[0004] In order to reduce the power consumption and complexity of the transceiving processing of Ambient IoT devices (hereinafter referred to as Device), the information between the network device and the Device is modulated by on-off keying (OOK), and in order to ensure that the Ambient IoT signal can coexist with the new radio (NR) / long term evolution (LTE) signal, it is necessary to generate the OOK signal based on orthogonal frequency-division multiplexing (OFDM).

[0005] However, the power of the OOK signal generated based on OFDM is too concentrated in the frequency domain, and more quantization bits are needed to accurately represent the frequency domain signal, which narrows the dynamic range of downlink power allocation, limits the flexibility of resource allocation on the network device side, and may also cause interference to the signals of neighboring cells on certain frequency domain resources. SUMMARY

[0006] To solve the above problems, the application provides an OOK signal generation method, a network device and a storage medium, so that the dynamic range of downlink power allocation is widened, the flexibility of network device side resource allocation is improved, and the possibility of interference of the OOK signal to signals of adjacent cells on specific frequency domain resources is reduced.

[0007] In a first aspect, the application provides an OOK signal generation method, which can be applied to a network device, and the method comprises: determining a time domain signal segment of each high level segment included in an original on-off keying (OOK) signal, each bit signal of the original OOK signal comprising a high level segment and a low level segment; representing each time domain signal segment by a time domain signal sequence, wherein the sequence length of the time domain signal sequence is equal to the sequence length of the corresponding time domain signal segment, at least two time domain signal sequences in the time domain signal sequence corresponding to each time domain signal segment are different in time domain frequency points, and each time domain frequency point is within a preset transmission bandwidth; concatenating each time domain signal sequence and each low level segment according to the time domain position to obtain a first time domain signal; and generating an orthogonal frequency division multiplexing (OFDM) symbol carrying the first OOK signal by using the first time domain signal.

[0008] In the technical solution of the application, at least two time domain signal sequences in the time domain signal sequence corresponding to each time domain signal segment of the original OOK signal are different in time domain frequency points, that is, different time domain signal segments are equivalently replaced by time domain signal sequences of different frequency points, so that the first time domain signal obtained from the original OOK signal can be dispersed in power after being converted into a frequency domain signal, so that the ratio of the maximum amplitude value to the minimum amplitude value in the frequency domain signal within the transmission bandwidth is reduced. Since the ratio is reduced, the number of quantization bits required for accurately quantizing the OOK frequency domain signal is reduced, the dynamic range of downlink power allocation is increased, and the flexibility of network device side resource allocation is improved. At the same time, since the power of the OOK signal generated based on OFDM is dispersed in the frequency domain, it will not be excessively concentrated, so it can also reduce the interference of the OOK signal to signals of adjacent cells on specific frequency domain resources.

[0009] In a possible implementation, the determination of the time domain signal segment of at least one high level segment included in the original OOK signal comprises: dividing each high level segment of the original OOK signal into L time domain signal segments, L being an integer greater than or equal to 2.

[0010] In this implementation, for the original OOK signal, each ON chip is divided into L segments regardless of whether the number of bits is greater than 1, so that the ratio of the maximum amplitude value to the minimum amplitude value in the frequency domain signal within the transmission bandwidth can be significantly reduced after the first time domain signal is converted into a frequency domain signal.

[0011] In a possible implementation, determining the time domain signal segment of each high level segment included in the original on-off keying (OOK) signal includes: when the original OOK signal only includes 1-bit signal, or when the original OOK signal only includes 1 high level segment, or when the original OOK signal only includes 1 low level segment, or when the original OOK signal only includes two segments, dividing the high level segment of the original OOK signal into L time domain signal segments, L is an integer greater than or equal to 2; when the original OOK signal includes at least 2-bit signal, or when the original OOK signal includes at least 2 high level segments, or when the original OOK signal includes at least 2 low level segments, or when the original OOK signal includes at least 4 segments, determining each high level segment of the original OOK signal as a time domain signal segment.

[0012] Since the scheme needs different frequency time domain signal sequences to equivalently replace different time domain signal segments, when the original OOK signal only includes 1 bit, the unique ON chip needs to be segmented to construct multiple time domain signal segments, and then different frequency time domain signal sequences are used to equivalently replace the multiple time domain signal segments. When the original OOK signal carried on the OFDM symbol includes multiple bits, multiple ON chips can not be segmented, and different frequency time domain signal sequences are directly used to equivalently replace the ON chips, and at this time, one ON chip is regarded as one time domain signal segment. One or more of the multiple ON chips can also be segmented, and then different frequency time domain signal sequences are used to equivalently replace the segmented multiple time domain signal segments.

[0013] In a possible implementation, the time domain signal sequence corresponding to the ith time domain signal segment is a complex signal sequence a i (n), and the complex signal sequence a i (n) is specifically: wherein, n = 0, 1, …, N-1, N is the number of sampling points included in the ith time domain signal segment, t s is a sampling time interval, is a time domain frequency point of the pth component corresponding to the ith time domain segment, is an amplitude of the pth component corresponding to the ith time domain signal segment, is a phase of the pth component corresponding to the ith time domain segment, p = 0, 1, …, Q-1, Q is the number of components corresponding to the ith time domain segment.

[0014] In a possible implementation, the time domain signal sequence corresponding to the ith time domain signal segment is a complex signal sequence a i (t), and the complex signal sequence a i (t) is specifically: wherein, t start,i ≤t<t start,i+1 , t start,i is the start time of the i-th time domain signal segment, t start,i+1 is the start time of the i+1-th time domain signal segment, is the frequency point of the p-th component corresponding to the i-th time domain segment, is the amplitude of the p-th component corresponding to the i-th time domain signal segment, is the phase of the p-th component corresponding to the i-th time domain segment, p=0, 1, …, Q-1, Q is the number of components corresponding to the i-th time domain segment.

[0015] In a possible implementation, the time domain signal sequence corresponding to the i-th time domain signal segment is a real signal sequence a i (n), and the real signal sequence a i (n) is specifically: wherein, n=0, 1, …, N-1, N is the number of sampling points included in the i-th time domain signal segment, t s is a sampling time interval, is the frequency point of the p-th component corresponding to the i-th time domain segment, is the amplitude of the p-th component corresponding to the i-th time domain signal segment, is the phase of the p-th component corresponding to the i-th time domain segment, p=0, 1, …, Q-1, Q is the number of components corresponding to the i-th time domain segment.

[0016] In a possible implementation, the time domain signal sequence corresponding to the i-th time domain signal segment is a real signal sequence a i (n), and the real signal sequence a i (n) is specifically: wherein, n=0, 1, …, N-1, N is the number of sampling points included in the i-th time domain signal segment, t s is a sampling time interval, is the frequency point of the p-th component corresponding to the i-th time domain segment, is the amplitude of the p-th component corresponding to the i-th time domain signal segment, is the phase of the p-th component corresponding to the i-th time domain segment, p=0, 1, …, Q-1, Q is the number of components corresponding to the i-th time domain segment.

[0017] In a possible implementation, the Δf is a subcarrier spacing of an OFDM symbol, and the is a positive integer.

[0018] In a possible implementation manner, The K is a positive integer, and Δf·K is greater than or equal to the preset transmission bandwidth, to ensure that the number of sampling points is sufficient.

[0019] In a possible implementation manner, The K is a positive integer, and Δf·K is greater than or equal to the preset transmission bandwidth, to ensure that the number of sampling points is sufficient. The following is satisfied:

[0020] This implementation manner can make the phases of the time-domain signal segments be continuous after the time-domain signal segments are represented by time-domain signal sequences. When the time-domain signal sequences corresponding to the time-domain signal segments are subjected to DFT transformation, the frequency-domain signals do not have many power complex amplitudes outside the transmission bandwidth, that is, it is beneficial to reduce the energy leakage outside the transmission bandwidth, and as many energies as possible are concentrated in the transmission bandwidth.

[0021] In a possible implementation manner, The following is satisfied:

[0022] This implementation manner can make the phases of the time-domain signal segments be continuous after the time-domain signal segments are represented by time-domain signal sequences. When the time-domain signal sequences corresponding to the time-domain signal segments are subjected to DFT transformation, the frequency-domain signals do not have many power complex amplitudes outside the transmission bandwidth, that is, it is beneficial to reduce the energy leakage outside the transmission bandwidth, and as many energies as possible are concentrated in the transmission bandwidth.

[0023] In a possible implementation manner, the first time-domain signal is used to generate an orthogonal frequency division multiplexing, OFDM, symbol carrying the first OOK signal, and specifically includes: performing Fourier transformation on the first time-domain signal to obtain a first frequency-domain signal; performing clipping on the first frequency-domain signal to obtain a second frequency-domain signal; mapping subcarriers of the second frequency-domain signal to a first number of subcarriers in the transmission bandwidth, the number of the subcarriers of the second frequency-domain signal being the first number; when there is a corresponding frequency-domain signal on other subcarriers in the transmission bandwidth except the first number of subcarriers, performing inverse Fourier transformation on the second frequency-domain signal after the mapping is completed together with the corresponding frequency-domain signals on the other subcarriers and adding a cyclic prefix, CP, to generate the OFDM symbol carrying the first OOK signal; otherwise, performing inverse Fourier transformation on the second frequency-domain signal after the mapping is completed and adding a CP to generate the OFDM symbol carrying the first OOK signal.

[0024] In a possible implementation manner, the first frequency-domain signal is subjected to clipping to obtain the second frequency-domain signal, and specifically includes: retaining signal components of target frequency points in the first frequency-domain signal within a first bandwidth, the first bandwidth being less than or equal to the preset transmission bandwidth.

[0025] By cropping the frequency domain signal, the energy leaking outside the transmission bandwidth can be reduced, so that most of the energy is concentrated within the transmission bandwidth, which can reduce interference to signals in other frequency bands outside the transmission bandwidth.

[0026] Secondly, this application also provides a network device, which includes a processor and a memory, the processor being coupled to the memory; the memory is used to store computer programs and / or instructions; the processor is used to execute the computer programs and / or instructions stored in the memory to implement the OOK signal generation method provided by the first aspect and any implementation thereof above.

[0027] Thirdly, this application also provides a computer program product, which includes a computer program or instructions for executing the OOK signal generation method provided by the first aspect and any implementation thereof.

[0028] Fourthly, this application also provides a computer-readable storage medium storing a computer program or instructions that, when executed on a network device, cause the network device to perform the OOK signal generation method provided by the first aspect and any implementation thereof. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the different categories of IoT connection scale provided in this application;

[0030] Figure 2 is a schematic diagram of the architecture of a communication system provided in this application;

[0031] Figure 3 is a schematic diagram of the architecture of another communication system provided in this application;

[0032] Figure 4 is a schematic diagram of the bit information of the OOK modulated signal;

[0033] Figure 5 is a schematic diagram of an OOK modulated signal that includes multiple bits of information;

[0034] Figure 6 is a schematic diagram of the principle of an OOK signal generated based on OFDM provided in this application;

[0035] Figure 7 is a schematic diagram showing the correspondence between the OOK signal and the digital signal sequence provided in this application;

[0036] Figure 8 is a schematic diagram showing the relationship between the amplitude and frequency of the frequency domain signal provided in this application;

[0037] Figure 9 is a flowchart of a method for generating an OOK signal according to an embodiment of this application;

[0038] FIG. 10 is a flowchart of another method for generating an OOK signal according to an embodiment of the present application;

[0039] FIG. 11 is a schematic diagram of segmenting an OOK signal according to an embodiment of the present application;

[0040] FIG. 12 is a schematic diagram of the relationship between the amplitude and frequency of a second frequency domain signal according to an embodiment of the present application;

[0041] FIG. 13 is a schematic diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] To make the person in the art more clearly understand the scheme of the present application, the application scenario of the technical scheme of the present application is first described below.

[0043] With the development of Internet of Things (IoT) technology, it has been agreed that there are three different speed gears for the classification of IoT nodes, i.e., high-speed IoT, medium-speed IoT, and low-speed IoT. Among them, high-speed IoT is mainly carried by 5th-Generation (5G) Enhanced Mobile Broadband (eMBB), Category.4+ (Cat.4+), Wi-Fi 6, etc., medium-speed IoT is currently mainly carried by 4G Cat.1, 3G, 2G, etc., and low-speed IoT is mainly carried by Narrowband-Internet of Things (NB-IoT), Long Range Wide Area Network (LoRaWAN), Bluetooth Low Energy (BLE), etc. Different speeds also correspond to different power consumption levels, forming three major categories of scenarios, and also facing three different orders of magnitude of IoT connections.

[0044] Referring to FIG. 1, which is a schematic diagram of the connection scale of IoT nodes of different classifications according to an embodiment of the present application.

[0045] Low-speed IoT standards such as NB-IoT, LoRaWAN, and BLE can support hundreds of billions of connections, and the connection scale brought by medium-speed and high-speed IoT standards is far lower than that of low-speed IoT. Based on the above three categories of IoT scenarios, Ambient IoT will become the main source of hundreds of billions of IoT connections.

[0046] The main application scenarios of Ambient IoT include, but are not limited to, industrial sensor networks, logistics and warehousing, smart wearable devices, medical health, smart home, etc. The following will be explained in detail.

[0047] Industrial sensor networks: Industrial sensor networks are mainly applied in industrial production processes, such as temperature and humidity monitoring, vibration monitoring, and production line monitoring, so as to realize industrial automation and intelligent management. Taking rail measurement as an example, by deploying zero-power sensing devices under the rail, the rail pressure, temperature and other information can be monitored and collected. In addition, related devices can also be deployed in extreme environments such as high and low temperature, mobile or rotating parts, high vibration conditions, and high humidity, where batteries cannot last long.

[0048] Logistics and warehousing: With the continuous growth of the logistics industry, the pressure on enterprise warehousing and labor costs is increasing. Digital management of logistics packages can not only further improve the efficiency of logistics and warehousing management, but also save high labor costs. Zero-power communication technology attaches a communication terminal identification sticker to the surface of the package or the packaging of goods for logistics information acquisition and management of the entire logistics process, making warehousing operations more simple and efficient.

[0049] Smart wearable devices: Smart wearable devices are one of the most potential personal consumer terminals after mobile phones, and various wearable devices have achieved wireless connection. According to the functional positioning of different products, it can realize health monitoring, motion monitoring, mobile sensing, mobile positioning and other multi-scenario applications. The goal of zero-power communication technology is to ultimately break free from battery constraints, achieve longer battery life, more convenient energy supply and better user experience.

[0050] Medical health: Portable medical devices can meet the needs of consumers for home health services, but due to the special nature of medical monitoring devices (especially human implantable devices), the problems of battery life and power carrying have greatly limited the expansion of their application scenarios. Through zero-power Internet of Things technology, extremely low power consumption can be achieved; at the same time, without a battery, the volume can be reduced, which is conducive to realizing flexible folding and not worrying about liquid immersion, which will help real-time monitoring of medical device data and efficient digital management of health conditions.

[0051] Smart home: In the field of smart home, zero-power communication technology can be applied to get rid of complex wiring, enable each terminal to be independently controlled, and achieve long-lasting online without human energy intervention.

[0052] Traditional radio frequency identification (RFID) is a passive Internet of Things technology, which realizes non-contact two-way data communication through radio frequency, reads and writes the recording medium (electronic tag or radio frequency card) through radio frequency, and achieves the purpose of identifying targets and data exchange. However, this technology does not have interference management, does not support mobility, and the coverage distance is only about 10 m, so it is difficult to support the use demand of hundreds of billions of scale in the future. Therefore, the 3rd Generation Partnership Project (3GPP) is discussing the formulation of passive Internet of Things technology based on cellular communication. On the one hand, it can reduce costs by using existing large-scale cellular infrastructure, and on the other hand, it can also use many mature technologies of cellular communication to improve the coverage range of passive Internet of Things, such as interference management, mobility management and other technologies.

[0053] First, the architecture of the communication system in the embodiment of the present application is introduced.

[0054] Referring to FIG. 2, it is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application.

[0055] The communication system includes a network device 201, an environmental Internet of Things device 204 and an intermediate node 202.

[0056] The intermediate node 202 can be a user equipment (UE), an integrated access and backhaul (IAB) node, a repeater, etc. The intermediate node 202 communicates with the network device 201 through a Uu interface. Among them, the capital letter U represents the user to network interface (UNI), and the lowercase letter u represents universal.

[0057] The intermediate node 202 in FIG. 2 can also be called Reader, that is, the intermediate node 202 in this architecture can act as a reader-writer, or be called a read-write end. The environmental Internet of Things device 204 can also be called Device.

[0058] Referring to FIG. 3, it is a schematic diagram of the architecture of another communication system provided by an embodiment of the present application.

[0059] The communication system includes a network device 201 and an environmental Internet of Things device 204. The environmental Internet of Things device 204 can establish communication with the network device 201, and the network device 201 can be located indoors.

[0060] The network device 201 in FIG. 1 and FIG. 2 can also be referred to as a Reader, that is, the network device 201 can act as a reader-writer, or be referred to as a read-write end. The environmental Internet of Things device 204 can also be referred to as a Device.

[0061] In the above two communication systems, the Ambient IoT device range Device1 and Device2 are currently divided into two categories according to power consumption.

[0062] The peak power consumption of Device1 is at the level of 1 μW, and the device does not have amplification capability for downlink and uplink. The uplink transmission of the device is backscattered on an externally provided carrier wave, and the uplink transmission power is small and the frequency modulation range is small.

[0063] The peak power consumption of Device2 is at the level of several hundred μW. According to whether the Device-to-Reader uplink transmission is backscattered or generated by the Device itself, Device2 is further divided into Device2a and Device2b.

[0064] Among them, the Device2a type device has energy storage, the device has amplification capability for downlink and / or uplink, the uplink transmission of the device is backscattered on an externally provided carrier wave, the uplink transmission power is moderate, and the frequency modulation range is moderate.

[0065] The Device2b type device has energy storage, the device has amplification capability for downlink and / or uplink, the uplink transmission of the device is generated internally, the uplink transmission power is large, and the frequency modulation range is large.

[0066] For Device1 and Device2a, the uplink transmission power is also related to the distance between the external carrier wave (CW) node and the Internet of Things device.

[0067] The scheme provided by the embodiments of the present application can be applied to a third generation partnership project (3rd generation partnership project, 3GPP) related cellular communication system, for example, a fourth generation (4th generation, 4G) communication system, such as a long term evolution (long term evolution, LTE) communication system, and can also be applied to a fifth generation (5th generation, 5G) communication system, such as a 5G new radio (new radio, NR) communication system, or various communication systems in the future, such as a sixth generation (6th generation, 6G) communication system. th

[0068] ​The method provided by the embodiments of the present application can also be applied to a Bluetooth system, a Wi-Fi system, a LoRa system, or a vehicle-to-everything (V2X) system, support a communication system of multiple wireless technology fusion, and a device-to-device (D2D) system. The method provided by the embodiments of the present application can also be applied to a satellite communication system. The satellite communication system can be fused with the above communication systems. The wireless communication system involved in the present application also includes but is not limited to a narrowband-internet of things (NB-IoT) system, a global system for mobile communications (GSM) system, an enhanced data rate for GSM evolution (EDGE) system, a wideband code division multiple access (WCDMA) system, a code division multiple access (CDMA2000) system, or a time division-synchronization code division multiple access (TD-SCDMA) system.

[0069] The network device can be an access network device of a 3GPP related cellular system. For example, a 4G mobile communication system or a 5G mobile communication system. The network device can also be an access network device in an open radio access network (O-RAN or ORAN) or a cloud radio access network (CRAN). Alternatively, the network device can also be an access network device in a communication system obtained by fusing two or more of the above communication systems.

[0070] The network device includes, but is not limited to, an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, a home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WiFi) system, a macro base station, a micro base station, a wireless relay node, a donor node, a radio controller in a CRAN scenario, a wireless backhaul node, a transmission point (TP), or a transmission and receiving point (TRP). The network device can also be an access network device in a 5G mobile communication system. For example, a next generation NodeB (gNB), a TRP, a TP, or one or a group (including multiple antenna panels) of antenna panels of a base station in a new radio (NR) system, or a base station in a 5G mobile communication system. Alternatively, the network device can also be a network node that constitutes a gNB or a transmission point. For example, a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately arranged, or can be included in the same network element. For example, a BBU. The RU can be included in a radio frequency device or a radio frequency unit. For example, in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). Alternatively, the network device can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, in a V2X technology, the network device can be a road side unit (RSU).

[0071] It should be noted that the network device can be the device or apparatus shown above, or a component (for example, a chip), a module, or a unit in the device or apparatus shown above, and the specific application does not make any limitation.

[0072] The intermediate node 202 can be a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. In some scenarios, the intermediate node 202 can be a device that provides voice or data connectivity for a user, specifically, a device that provides voice for a user, or a device that provides data connectivity for a user, or a device that provides both voice and data connectivity for a user. For example, it can include a handheld device with a wireless connection function, or a processing device connected to a wireless modem. The intermediate node 202 can also be a terminal device that can communicate with a core network through a radio access network (RAN), exchange voice or data with the RAN, or interact with the RAN for voice and data. Currently, the terminal device can be: a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device (such as a smart watch, a smart bracelet, a pedometer, etc.), a vehicle-mounted device (such as a car, a bicycle, an electric vehicle, an airplane, a ship, a train, a high-speed rail, etc.), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a smart home device (such as a refrigerator, a television, an air conditioner, an electricity meter, etc.), a smart robot, a workshop device, a wireless terminal in unmanned driving, a wireless terminal in remote surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, or a wireless terminal in a smart home, a flight device (such as a smart robot, a hot air balloon, a drone, an airplane), etc. The terminal device can also be other devices with terminal functions, for example, the terminal device can also be a device that plays a terminal function in D2D communication.The terminal device can also include a vehicle to everything (V2X) terminal device, a machine to machine / machine-type communications (M2M / MTC) terminal device, an internet of things (IoT) terminal device, a light terminal device, a reduced capability UE (REDCAP UE), a subscriber unit, a subscriber station, a mobile station, a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, or a user device, a drone device, etc. For example, it can include a mobile phone (or called "cellular" phone), a computer with a mobile terminal device, a portable, pocket, handheld, built-in computer mobile device, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. It also includes limited devices, such as devices with lower power consumption, or devices with limited storage capacity, or devices with limited computing capacity, etc. For example, it includes information sensing devices such as bar code, radio frequency identification (RFID), sensor, global positioning system (GPS), laser scanner, etc. In this application, the terminal device with wireless transceiver function and the chip that can be arranged in the terminal device are collectively referred to as terminal device.

[0073] It should be noted that the intermediate node 202 can be a device or apparatus with a chip, or a device or apparatus integrated with a circuit, or a chip, module or control unit in the above-mentioned devices or apparatus, which is not limited in the present application.

[0074] In the 3GPP Ambient IoT system, in order to reduce the power consumption and complexity of the transceiver processing of the Device, the Reader sends information to the Device (hereinafter referred to as R2D), or the Device sends information to the Reader (hereinafter referred to as D2R), and an on-off keying (OOK) modulation method is adopted.

[0075] Referring to FIGS. 4 and 5 together. FIG. 4 is a schematic diagram of bit information of an OOK modulated signal; and FIG. 5 is a schematic diagram of an OOK modulated signal including multiple bit information.

[0076] OOK modulation represents the simplest form of amplitude-shift keying (ASK) modulation, also known as binary amplitude-shift keying (2ASK). It is to control the opening and closing of the sinusoidal carrier with a single polarity non-return-to-zero code sequence. The modulated carrier amplitude is 0, which represents binary 0, and the modulated carrier amplitude is not 0, which represents binary 1.

[0077] Both of FIGS. 4 and 5 are unmodulated original OOK signals, that is, OOK modulation information. Bit (also known as binary bit) refers to a bit in binary, which is the smallest unit of information. Taking FIG. 4 as an example, OOK ON is generally considered as a high-level signal, and OOK OFF is a low-level signal. The high-level ON is switched to low-level OFF through the falling edge to represent binary 1, and the low-level OFF is switched to high-level ON through the rising edge to represent binary.

[0078] If multiple bits of binary numbers are to be sent, the respective OOK modulated signals of the multiple bits are concatenated to obtain the OOK modulated signal to be sent. For example, for the bit stream "1101", the corresponding OOK modulated signal is shown in FIG. 5.

[0079] In the 3GPP Ambient IoT system, in order to enable the Reader and the Device to communicate normally, a band-internal deployment, independent deployment, or protected band deployment can be adopted, which will be described below.

[0080] Band-internal deployment refers to reserving a frequency domain resource within the transmission bandwidth of the NR / LTE carrier to deploy the Ambient IoT system, and using the reserved frequency domain resource to implement the transmission of related signals.

[0081] The guard band deployment refers to deploying the Ambient IoT system in the guard band of the NR / LTE carrier. The part of the bandwidth that is more than the required bandwidth of the carrier is called the guard band, which is used to completely isolate the channels, and the bandwidth remaining in the channel bandwidth except the guard band is called the transmission bandwidth, and the guard band is generally located on both sides of the transmission bandwidth.

[0082] The independent deployment refers to that the frequency spectrum resources used for deploying the Ambient IoT system are independent and do not serve as the transmission bandwidth or the guard band of other systems.

[0083] For the Ambient IoT system using the in-band deployment or the guard band deployment, in order to ensure the coexistence of the Ambient IoT signal and the NR / LTE signal, the R2D transmission cannot directly send the original OOK signal, because there is a large interference between the original OOK signal and the NR / LTE signal, and therefore the OOK signal generated based on the orthogonal frequency-division multiplexing (OFDM) needs to be used.

[0084] The traditional digital modulation and frequency division use frequency division to transmit different information through different frequency bands. The OFDM divides a whole frequency band into a plurality of sub-carriers, and makes each sub-carrier orthogonal to each other, so that they do not overlap in the frequency spectrum, which can reduce interference and improve the frequency spectrum utilization of the carrier.

[0085] Referring to FIG. 6, which is a schematic diagram of an OOK signal generated based on OFDM provided by the present application.

[0086] Specifically, for each OOK signal carried by the OFDM, an original OOK modulated signal carried on an OFDM symbol is first determined. The original OOK modulated signal can be a Bit, or a concatenation of a plurality of bit signals.

[0087] After the original OOK modulated signal is generated, a Discrete Fourier Transform (DFT) is performed on the original OOK modulated signal to obtain a corresponding frequency domain signal, which can be shown as F1 in FIG. 6.

[0088] The commonly used DFT method can be Fast Fourier Transform (FFT).

[0089] The obtained frequency domain signal is cropped to obtain a cropped frequency domain signal F2. The cropped frequency domain signal is used to retain signal components within a given bandwidth on both sides of the target frequency point. The given bandwidth does not exceed the transmission bandwidth of the Ambient IoT signal configured / scheduled by the network device. The transmission bandwidth is determined by the number of subcarrier intervals used for Ambient IoT signal transmission. By cropping the frequency domain signal, the leaked energy outside the transmission bandwidth can be reduced, so that most of the energy is concentrated within the transmission bandwidth, and interference can be reduced.

[0090] For the cropped frequency domain signal F2, the number of corresponding subcarriers is N, and the N subcarriers are mapped to the subcarriers used for Ambient IoT signal transmission. Specifically, taking FIG. 6 as an example, the total bandwidth configured by the network device for Ambient IoT signal transmission and NR / LTE signal transmission includes K subcarriers, of which the first N subcarriers can be used for Ambient IoT signal transmission, and the remaining subcarriers can be used for NR / LTE signal transmission. That is, the cropped frequency domain signal is mapped to the first N subcarriers of the K subcarriers. In addition, other mapping methods can also be used according to the configuration, for example, mapping to the last N subcarriers or the middle N subcarriers of the K subcarriers.

[0091] After mapping, the cropped frequency domain signal F2 is subjected to Inverse Fast Fourier Transform (IFFT) together with the NR / LTE corresponding frequency domain signal on other subcarriers, and then a cyclic prefix (CP) is added to obtain an OFDM signal. The signal is an OFDM symbol, which can indicate a frequency domain sequence including points containing different components and energy contained by the frequency points.

[0092] Referring to FIG. 7, which is a schematic diagram of the correspondence between the OOK signal and the digital signal sequence provided by the present application.

[0093] Taking an OFDM symbol carrying a 4-bit OOK signal as an example, for the original OOK signal 1101, the chip where ON is located is generally considered as a high-level signal in the time domain, and the corresponding digital signal sequence is a full-1 sequence, that is, [1, 1, …, 1], and each digital sampling point is 1. The chip where OFF is located is a low-level signal, and the corresponding digital signal sequence is a full-0 sequence, that is, [0, 0, …, 0],

[0094] Referring to FIG. 8, which is a schematic diagram of the relationship between the amplitude and the frequency of the frequency domain signal provided by the present application.

[0095] According to the above generation process of the OFDM-based OOK signal, the inventors observe the amplitudes of the signal components on both sides of the direct current in the frequency domain signal after DFT transformation, and calculate the ratio of the maximum amplitude value to the minimum amplitude value of the frequency domain signal. For the frequency domain signal in FIG. 8, the ratio = 1.73205 / 0.0250223, which is about 69, much larger than the corresponding ratio 31 of 1024-QAM.

[0096] The larger the ratio of the maximum amplitude value to the minimum amplitude value, the more quantization bits are needed to accurately represent the frequency domain signal. The quantization bits refer to the number of binary bits needed to distinguish all quantization levels. Taking 1024-QAM as an example, one symbol can convey 10 bits of information, representing 0000000000, 0000000001,..., 1111111111, respectively. This means a total of 1024 symbols, i.e., 10 quantization bits.

[0097] For the frequency domain signal shown in FIG. 8, the number of quantization bits required will be significantly greater than 10, resulting in an increase in the number of bits carried on one OFDM symbol.

[0098] The more bits carried on the OFDM symbol, the greater the transmission bandwidth of the OOK signal, and the greater the available transmission power, which increases the maximum amplitude of the OOK signal frequency domain component, i.e., more quantization bits are needed to accurately represent the frequency domain signal.

[0099] Under the condition of a given number of quantization bits, the more quantization bits used to represent the signal, the narrower the dynamic range of the downlink power allocation, limiting the flexibility of resource allocation on the network device side. Since the reception sensitivity of the OOK modulation method is much worse than that of the LTE / NR system, in order to ensure that the Ambient IoT has comparable coverage to the LTE / NR, the Ambient IoT must use a larger transmission power.

[0100] In addition, the power of the current OFDM-based OOK signal is too concentrated in the frequency domain, which means that even if the average power of the OOK signal is the same as that of the LTE / NR signal, it will cause stronger interference to the signals of neighboring cells on certain frequency domain resources. Therefore, even if the Ambient IoT system adopts an independent deployment scheme, interference may still exist for neighboring cells.

[0101] In summary, the current OFDM-based OOK signal generation scheme narrows the dynamic range of downlink power allocation, limits the flexibility of resource allocation on the network device side, and may also cause interference to signals on certain frequency domain resources of neighboring cells.

[0102] To solve the above technical problems, the application provides an OOK signal generation method, a network device and a storage medium. The method divides an original OOK signal into at least two time domain signal segments. Each time domain signal segment includes a complete high level segment, or multiple time domain signal segments include complete high level segments, and then different time domain signal segments are replaced by time domain signal sequences of different frequency points, so that the power of the frequency domain signal can be dispersed after the first time domain signal obtained according to the original OOK signal is converted into a frequency domain signal. By using the scheme, the dynamic range of downlink power distribution is widened, the flexibility of resource allocation on the network device side is improved, and the possibility of causing interference to signals of adjacent cells on specific frequency domain resources is also reduced.

[0103] The implementation manners and principles of the technical scheme of the application will be described below in detail with reference to the drawings.

[0104] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Rather, the use of the words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0105] It can be understood that the terms "first", "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. It should be understood that the terms used in the description of various described examples herein are only for the purpose of describing specific examples, and are not intended to be limiting. As used in the description of various described examples, the singular forms "a" and "the" are intended to include the plural forms, unless the context clearly indicates otherwise.

[0106] Referring to FIG. 9, which is a flowchart of an OOK signal generation method provided by an embodiment of the present application.

[0107] The method can be applied to a network device, and the method includes the following steps:

[0108] S11: Determine the time domain signal segment of each high level segment included in an original on-off keying (OOK) signal.

[0109] The original OOK signal is a concatenation of one or more bits of ON / OFF signals.

[0110] The types of segments include high level segments and low level segments, and each bit signal of the original OOK signal includes a high level segment and a low level segment.

[0111] For example, for bit1 in FIG. 4, one ON chip and one OFF chip are included; for bit0 in FIG. 4, one OFF chip and one ON chip are included.

[0112] The scheme of the present application needs to use time domain signal sequences of different frequency points to equivalently replace different time domain signal segments in the time domain in order to make the power of the signal in the frequency domain more dispersed. Therefore, it is necessary to ensure that all high-level segments included in the original OOK signal are divided into at least two time domain signal segments.

[0113] Specifically, when the original OOK signal carried on the OFDM symbol includes only 1 bit, only one ON chip is included, and therefore it is necessary to segment the unique ON chip to construct at least two time domain signal segments, and then use time domain signal sequences of different frequencies to equivalently replace the multiple time domain signal segments.

[0114] When the original OOK signal carried on the OFDM symbol includes multiple bits, multiple ON chips are included, and therefore the multiple ON chips can not be segmented and directly replaced by time domain signal sequences of different frequencies, that is, each ON chip is used as a time domain signal segment. One or more of the multiple ON chips can also be segmented, and then replaced by time domain signal sequences of different frequencies.

[0115] In the embodiments of the present application and the following description, the segmentation of the ON chip or the representation of the ON chip as a time domain signal sequence is taken as an example. In addition, the OFF chip can also be segmented or represented as a time domain signal sequence, but since the OFF chip is a zero sequence, the above processing can be omitted.

[0116] S12: Representing each time domain signal segment by a time domain signal sequence.

[0117] The sequence length of the time domain signal sequence is equal to the sequence length of the corresponding time domain signal segment, and in the time domain signal sequence corresponding to each time domain signal segment, the time domain frequency points of at least two time domain signal sequences are different.

[0118] And each time domain frequency point is within a preset transmission bandwidth, and the preset transmission bandwidth of the present application is the transmission bandwidth of the Ambient IoT signal configured by the network equipment side, and the specific range of the preset transmission bandwidth is not limited in the embodiments of the present application.

[0119] When each time domain frequency point is in the preset transmission bandwidth, the difference between the maximum value and the minimum value in the time domain frequency points corresponding to the time domain signal segment is also less than or equal to the transmission bandwidth of the Ambient IoT signal.

[0120] Each time domain signal segment can be represented by a time domain signal sequence, or can also be understood as replacing each time domain signal segment with a time domain signal sequence, and the power of the frequency domain signal obtained after performing DFT on the time domain signal sequence is more dispersed, and the maximum power peak value decreases

[0121] S13: Cascade each time domain signal sequence and each low-level segment according to the time domain position to obtain a first time domain signal.

[0122] The time domain position is used to represent the position of each time domain signal sequence and the low-level segment in the time domain.

[0123] It should be noted that when cascading, not only the time domain signal sequence needs to be cascaded according to the position, but also the OFF chip needs to be cascaded.

[0124] S14: Generate an OFDM symbol carrying a first OOK signal by using the first time domain signal.

[0125] The first time domain signal is used to replace the original OOK signal, that is, the first time domain signal is used as the initial signal carried on the OFDM symbol, and at this time, the OFDM symbol generated based on OFDM carries the first OOK signal, which is the signal used in the R2D transmission in the scenario of the present application.

[0126] In the scheme provided by the embodiments of the present application, at least two time domain signal sequences of the time domain signal sequence corresponding to each time domain signal segment of the original OOK signal are different in time domain frequency points, that is, different time domain signal sequences are used to replace different time domain signal segments, so that the power of the frequency domain signal obtained by converting the first time domain signal obtained from the original OOK signal into a frequency domain signal can be dispersed, and the ratio of the maximum amplitude value to the minimum amplitude value in the frequency domain signal within the transmission bandwidth decreases. Since the ratio decreases, the number of quantization bits required for accurately quantizing the OOK frequency domain signal can be reduced, the dynamic range of downlink power allocation is increased, and the flexibility of resource allocation on the network device side is improved. At the same time, since the power of the OOK signal generated based on OFDM appears to be dispersed in the frequency domain, it will not be excessively concentrated, and therefore the signal interference of the OOK signal on the specific frequency domain resource of the adjacent cell can be reduced.

[0127] The specific implementation will be described below.

[0128] Referring to FIG. 10, which is a flowchart of another method for generating an OOK signal provided by the embodiments of the present application.

[0129] The method can be applied to a network device as a Reader, for generating an OOK signal on an OFDM symbol, comprising the following steps:

[0130] S31: determining the number of time-domain signal segments on each segment of the original OOK signal carried on the OFDM symbol.

[0131] The original OOK signal is a concatenation of one or more bits of ON / OFF signals. Referring to FIG. 4 and FIG. 5, each chip corresponds to a complete high-level (ON) time-domain signal or a complete low-level (OFF) time-domain signal. That is, the types of chips include high-level chips (ON chips) and low-level chips (OFF chips), and one ON chip and one OFF chip form a 1-bit original OOK signal.

[0132] For example, bit1 in FIG. 4 includes one ON chip and one OFF chip; and bit0 in FIG. 4 includes one OFF chip and one ON chip.

[0133] In the scheme of the present application, the complete high-level chip is segmented, and the complete low-level chip can not be segmented to reduce the amount of data processing and improve processing speed. This is because for high-level 1, there is a power amplitude in the frequency domain, and for low-level 0, it is equivalent to not transmitting power, so the segmentation processing can not be performed.

[0134] In the scheme of the present application, when the original OOK signal carried on the OFDM symbol includes only 1 bit, the time-domain signal of the high-level chip, i.e., the ON chip, is evenly divided into L segments. When the original OOK signal carried on the OFDM symbol includes at least 2 bits, the time-domain signal of the high-level chip, i.e., the ON chip, can be evenly divided into L segments, or the time-domain signal of the ON chip can not be segmented, and the number of segments of the time-domain signal of the ON chip is 1.

[0135] The present application does not specifically limit L, and L can be a positive integer, and L is at least 2. In the following description, the value of L is taken as 2 for example. The specific value of L can be configured by the network device side or specified by a related protocol.

[0136] The reason for the segmentation is as follows: the concept of the present application is to use time-domain signal sequences of different frequencies to replace different time-domain signal segments. When the original OOK signal carried on the OFDM symbol only includes one bit, only one ON chip is included, and therefore the only ON chip needs to be segmented to obtain multiple time-domain signal segments, and then time-domain signal sequences of different frequencies are used to replace the multiple time-domain signal segments. When the original OOK signal carried on the OFDM symbol includes multiple bits, multiple ON chips are included, and therefore the multiple ON chips can be directly replaced by time-domain signal sequences of different frequencies without segmentation. One or more of the multiple ON chips can also be segmented, and then time-domain signal sequences of different frequencies are used to replace the segmented time-domain signal segments.

[0137] The time-domain signal sequence can be a complex signal sequence, or a real signal sequence, for example, a sine signal sequence or a cosine signal sequence.

[0138] The specific manner of determining the number of segments is described below.

[0139] In one possible implementation, the number of segments of the time-domain signal on each chip is determined according to the number of bits of the original OOK signal carried on one OFDM symbol.

[0140] When the number of bits is 1, the number of segments on each ON chip is determined to be L. The number of segments on each OFF chip is 1, that is, no segmentation is performed.

[0141] Referring to FIG. 11, which is a schematic diagram of segmenting an OOK signal according to an embodiment of the present application.

[0142] Taking L as 2 as an example, the ON chip is evenly divided into two segments, Segment#0 and Segment#1. No segmentation is performed on the OFF chip.

[0143] When the number of bits is greater than or equal to 2, the number of segments on each ON chip is determined to be L, and the number of segments on each OFF chip is 1, that is, no segmentation is performed. This implementation can be combined with the processing manner when the number of bits is 1, and as a whole, for the original OOK signal, whether the number of bits is greater than 1 or not, each ON chip is divided into L segments.

[0144] Alternatively, when the number of bits is greater than or equal to 2, the number of segments on each ON chip is determined to be 1, and the number of segments on each OFF chip is 1, that is, no segmentation is performed on the ON chip and the OFF chip, and each ON chip is directly used as a time-domain signal segment.

[0145] In another possible implementation, the number of time-domain signal segments on each chip is determined according to the number of chips of the original OOK signal carried on one OFDM symbol.

[0146] When the number of chips of the original OOK signal is 2, it indicates that the current bit number is 1, i.e., one ON chip and one OFF chip are included, and the number of segments on each ON chip is determined as L. The number of segments on each OFF chip is 1, i.e., no segmentation is performed.

[0147] When the number of chips of the original OOK signal is a positive integer greater than 2, i.e., at least four chips are included, it indicates that the current bit number is greater than 1, i.e., at least two ON chips and at least two OFF chips are included. The number of segments on each ON chip is determined as L, and the number of segments on each OFF chip is 1; or, the number of segments on each ON chip is determined as 1, and the number of segments on each OFF chip is 1.

[0148] In yet another possible implementation, the number of time-domain signal segments on each chip is determined according to the number of high-level chips (ON chips) or the number of low-level chips (OFF chips) of the original OOK signal carried on one OFDM symbol.

[0149] First, an example of determining the number of time-domain signal segments on each chip according to the number of ON chips is described.

[0150] When the number of ON chips of the original OOK signal is 1, it indicates that the current bit number is 1, and the number of segments on each ON chip is determined as L. The number of segments on each OFF chip is 1, i.e., no segmentation is performed.

[0151] When the number of ON chips of the original OOK signal is a positive integer greater than 1, it indicates that the current bit number is greater than 1, i.e., at least two ON chips and at least two OFF chips are included. The number of segments on each ON chip is determined as L, and the number of segments on each OFF chip is 1; or, the number of segments on each ON chip is determined as 1, and the number of segments on each OFF chip is 1.

[0152] Next, an example of determining the number of time-domain signal segments on each chip according to the number of OFF chips is described.

[0153] When the number of OFF chips of the original OOK signal is 1, it indicates that the number of bits is currently 1, and at this time, the number of segments on each ON chip is determined to be L. The number of segments on each OFF chip is 1, that is, no segmentation is performed.

[0154] When the number of OFF chips of the original OOK signal is a positive integer greater than 1, it indicates that the number of bits is currently greater than 1, that is, it includes at least two OFF chips and at least two OFF chips. At this time, the number of segments on each ON chip is determined to be L, and the number of segments on each OFF chip is 1; or, the number of segments on each ON chip is determined to be 1, and the number of segments on each OFF chip is 1.

[0155] It should be noted that for Ambient IoT devices, due to their general characteristics of high integration and low signal processing capability, the case where the original OOK signal includes only one bit is more common, for example, using a one-bit flag to control the Ambient IoT device to start or stop a characteristic function. Therefore, the above signal segmentation method is designed for the case where the original OOK signal includes only one bit.

[0156] S32: For each time domain signal segment, determine the corresponding time domain signal sequence.

[0157] For the ON chip or the segmented ON chip, the corresponding digital signal sequence is a sequence of all 1s, that is: [1, 1, …, 1]. The difference is that for the unsegmented ON chip, the sequence length is longer, and for the segmented ON chip, the sequence length corresponding to each time domain signal segment is shorter.

[0158] It can be understood that the present application is an example of evenly segmenting the ON chip, that is, the sequence length corresponding to each time domain signal segment in the segmented ON chip is the same. In other embodiments, the ON chip can also be unevenly segmented, that is, the sequence length corresponding to each time domain signal segment in the segmented ON chip is different, but the subsequent processing principle is similar and will not be repeated here.

[0159] Each time domain signal segment can be represented by a time domain signal sequence, or it can be understood that each time domain signal segment is replaced by a time domain signal sequence, and the power of the frequency domain signal obtained after DFT of the time domain signal sequence is more dispersed, and the maximum power peak decreases.

[0160] The time domain signal sequence can be a complex signal sequence or a real signal sequence, which will be described below.

[0161] For the complex signal sequence, in one possible implementation, its discrete signal form is shown in the following formula:

[0162] wherein n=0, 1, …, N-1. That is, n is a non-negative integer, N is the number of sampling points included in the time domain signal segment corresponding to the time domain signal sequence, that is, the number of 1s in the all-1 sequence. The sequence length of the time domain signal segment, that is, the number of 1s in the all-1 sequence. is the amplitude of the pth component corresponding to the ith time domain segment. is the phase of the pth component corresponding to the ith time domain segment.

[0163] p=0, 1, …, Q-1, Q is the number of components corresponding to the ith time domain segment.

[0164] At this time, the sequence length of the time domain signal sequence is equal to the sequence length of the corresponding time domain signal segment. The size of N can reflect the time length of the time domain signal segment.

[0165] The ith sampling point in the time domain signal segment is denoted by a i (n).

[0166] is the time domain frequency point of the pth component corresponding to the ith time domain segment.

[0167] When the number of ON chips of the original OOK signal is 1, i=0, 1, …, L-1.

[0168] When the number of ON chips of the original OOK signal is greater than 1, taking the case of including M ON chips as an example, when each ON chip is not segmented, i=0, 1, …, M-1; when each ON chip is segmented into L segments, i=0, 1, …, LM-1.

[0169] t s is the sampling time interval.

[0170] In another possible implementation, the discrete signal form of the complex signal sequence is shown in the following formula:

[0171] t start,i ≤t<t start,i+1 , t start,i is the starting time of the ith time domain segment, t start,i+1 is the starting time of the (i+1)th time domain segment, so that the sequence length of the time domain signal sequence is equal to the sequence length of the corresponding time domain signal segment. is the frequency point of the pth component corresponding to the ith time domain segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of the pth component corresponding to the ith time-domain segment, p = 0, 1, …, Q-1, Q being a number of components corresponding to the ith time-domain segment.

[0172] For a real signal sequence, a discrete signal form thereof can be seen from the following formula:

[0173] wherein, n = 0, 1, …, N-1. N is a number of sampling points included in the ith time-domain signal segment, t s a sampling time interval, a frequency point of the pth component corresponding to the ith time-domain segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of the pth component corresponding to the ith time-domain segment, p = 0, 1, …, Q-1, Q being a number of components corresponding to the ith time-domain segment.

[0174] For a real signal sequence, a continuous signal form thereof can be seen from the following formula:

[0175] t start,i ≤t<t start，i+1 , t start,i a starting time of the ith time-domain signal segment, t start,i+1 a starting time of the ith+1 time-domain signal segment, a frequency point of the pth component corresponding to the ith time-domain segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of the pth component corresponding to the ith time-domain segment, p = 0, 1, …, Q-1, Q being a number of components corresponding to the ith time-domain segment.

[0176] When the above formulae are used to represent the sampling points in the time-domain signal segment, the f i are different, and the dispersion of power in the frequency domain can be realized.

[0177] The difference between the maximum value and the minimum value in each frequency point of each component corresponding to all time-domain signal segments is less than or equal to the transmission bandwidth of the Ambient IoT signal.

[0178] Moreover, the value of each frequency point of each component corresponding to the time-domain signal segment does not exceed the frequency domain resource position of the Ambient IoT signal.

[0179] Further, the value of each frequency point of each component corresponding to the ith time-domain signal segment i may satisfy the following formula:

[0180] wherein, Δf is a subcarrier spacing of the OFDM symbol, is a positive integer.

[0181] is a sampling time interval t s satisfies the following formula:

[0182] wherein, K is a positive integer, and Δf·K is greater than or equal to a transmission bandwidth of the Ambient IoT signal, so as to ensure that the number of sampling points is sufficient.

[0183] The phase in the above formula In a possible implementation manner, may be randomly selected within the range interval. In another possible implementation manner, for formula (1) and (3), the value of satisfies the following relationship:

[0184] For formula (2) and formula (4), the phase the value of satisfies the following relationship:

[0185] When the value of the phase satisfies the above formula (6) and (8), the phase is continuous after each time domain signal segment is represented by a time domain signal sequence, and the continuous phase has the following advantages: when the time domain signal sequence corresponding to each time domain signal segment is subjected to DFT transformation, the frequency domain signal does not have more power complex amplitudes outside the transmission bandwidth, that is, it is beneficial to reduce the energy leakage outside the transmission bandwidth, so that as much energy as possible is concentrated in the transmission bandwidth.

[0186] S33: after each time domain signal segment is represented by a corresponding time domain signal sequence, the time domain signal sequences are concatenated according to time domain positions and the low-level segment, to obtain a first time domain signal.

[0187] It should be noted that when concatenating, not only the time domain signal sequences need to be concatenated according to positions, but also the OFF chip needs to be concatenated, which is illustrated below by way of example.

[0188] For example, continuing with the example of FIG. 11, when the original OOK signal includes only one bit, the ON chip is divided into two segments. One of the segments is denoted as Segment #0, and each sample point of Segment #0 is represented by a time-domain signal sequence a0(n) using Equation (1) or Equation (3). Each sample point of Segment #1 is represented by a time-domain signal sequence a1(n) using Equation (1) or Equation (3). The OFF chip is not segmented, and the all-zero sequence corresponding to the OFF chip is a0(0). Thus, the first time-domain signal obtained from the original OOK signal can be represented as a0(n) + a1(n) + a0(0).

[0189] For example, continuing with the example of FIG. 11, when the original OOK signal includes only one bit, the ON chip is divided into two segments. One of the segments is denoted as Segment #0, and each sample point of Segment #0 is represented by a time-domain signal sequence a0(t) using Equation (2) or Equation (4). Each sample point of Segment #1 is represented by a time-domain signal sequence a1(t) using Equation (2) or Equation (4). The OFF chip is not segmented, and the all-zero sequence corresponding to the OFF chip is a0(0). Thus, the first time-domain signal obtained from the original OOK signal can be represented as a0(t) + a1(t) + a0(0).

[0190] For example, as shown in FIG. 7, the original OOK signal includes 4 bits, specifically 1101. At this time, the ON chips can not be segmented. After each sampling point of the ON chip 1 is represented by a time domain signal sequence using formula (1) or formula (3), the corresponding time domain signal sequence is a0(n); after each sampling point of the ON chip 2 is represented by a time domain signal sequence using formula (1) or formula (3), the corresponding time domain signal sequence is a1(n); after each sampling point of the ON chip 3 is represented by a time domain signal sequence using formula (1) or formula (3), the corresponding time domain signal sequence is a2(n); and after each sampling point of the ON chip 4 is represented by a time domain signal sequence using formula (1) or formula (3), the corresponding time domain signal sequence is a3(n). The OFF chips are not segmented, the all-0 sequence corresponding to the OFF chip 1 is a0(0), the all-0 sequence corresponding to the OFF chip 2 is a1(0), the all-0 sequence corresponding to the OFF chip 3 is a2(0), and the all-0 sequence corresponding to the OFF chip 4 is a3(0). Therefore, the first time domain signal obtained from the original OOK signal can be represented as a0(n)+a0(0)+a1(n)+a1(0)+a2(n)+a2(0)+a3(n)+a3(0).

[0191] S34: Fourier transform is performed on the first time domain signal to obtain a first frequency domain signal.

[0192] Specifically, discrete Fourier transform (DFT) is performed on the first time domain signal to obtain the first frequency domain signal. A commonly used DFT method can be fast Fourier transform (FFT).

[0193] S35: The first frequency domain signal is cropped to obtain a second frequency domain signal.

[0194] The second frequency domain signal is a frequency domain signal obtained by cropping the first frequency domain signal,

[0195] The cropped frequency domain signal is used to retain signal components of both sides of the target frequency point within a given first bandwidth.

[0196] The first bandwidth is not more than the transmission bandwidth of the Ambient IoT signal configured / scheduled by the network device. The transmission bandwidth is determined by the number of subcarrier intervals used for Ambient IoT signal transmission.

[0197] Through cropping of the frequency domain signal, the energy leaked outside the transmission bandwidth can be reduced, so that most of the energy is concentrated within the transmission bandwidth, and the interference to signals of other frequency bands outside the transmission bandwidth can be reduced.

[0198] S36: mapping the subcarriers of the second frequency domain signal to the subcarriers within the transmission bandwidth.

[0199] For the second frequency domain signal, the number of its corresponding subcarriers is determined as the first number. It is assumed that the first number of the subcarriers corresponding to the second frequency domain signal is N, and N is a positive integer.

[0200] The total transmission bandwidth configured on the network device side for the transmission of the Ambient IoT signal and the NR / LTE signal includes K subcarriers.

[0201] The subcarriers of the second frequency domain signal are mapped to the subcarriers within the transmission bandwidth, that is, N subcarriers are selected from the K subcarriers for the subcarriers of the second frequency domain signal.

[0202] For example, the N subcarriers of the second frequency domain signal can be mapped to the first N subcarriers in the K subcarriers, or the N subcarriers of the second frequency domain signal can be mapped to the last N subcarriers in the K subcarriers. For another example, N non-continuous subcarriers are selected from the K subcarriers as the subcarriers of the second frequency domain signal.

[0203] S37: performing inverse Fourier transform on the mapped second frequency domain signal and the corresponding frequency domain signals on the other subcarriers and adding a cyclic prefix to generate a first OOK signal.

[0204] The other subcarriers refer to the remaining subcarriers within the transmission bandwidth except the first number of subcarriers.

[0205] For example, taking FIG. 6 as an example, the mapped second frequency domain signal occupies N subcarriers, and the other K-N subcarriers can be used for NR / LTE signal transmission. The present application scheme realizes the coexistence of NR / LTE signal and Ambient IoT, and can perform inverse Fourier transform on the mapped second frequency domain signal and the corresponding frequency domain signals on the other subcarriers and add a cyclic prefix.

[0206] The cyclic prefix (CP) is a cyclic structure formed by copying the signal at the tail of the OFDM symbol to the head, which can resist inter-symbol interference (ISI) and inter-carrier interference (ICI).

[0207] The obtained OFDM signal can also be called an OFDM symbol, and the OOK signal is located on the OFDM symbol. The OFDM symbol can indicate a frequency domain sequence, including points containing different components and the energy contained in the frequency points.

[0208] It can be understood that when the independent deployment implementation manner is adopted, there is no corresponding frequency domain signal on the subcarriers other than the first number of subcarriers in the transmission bandwidth, and at this time, the second frequency domain signal after mapping can be directly subjected to inverse Fourier transform and CP addition to generate the OFDM symbol carrying the first OOK signal.

[0209] Referring to FIG. 12, it is a schematic diagram of the relationship between the amplitude and the frequency of the second frequency domain signal provided by the embodiment of the application.

[0210] Still taking the OOK signal carrying 4 bits [1, 1, 0, 1] on one OFDM symbol as an example. At this time, the number of segments of the ON chip is 1. The frequency points of the time domain signal sequences used by the 4 ON chips are 0, 2Δf, 4Δf, and 6Δf, for example. The first time domain signal is obtained in the manner of S33, and then the second frequency domain signal is determined through S34-S35.

[0211] The waveform of the second frequency domain signal is shown in FIG. 12, and the amplitudes of the signal components on both sides of the direct current in the second frequency domain signal are detected. In the transmission bandwidth, the ratio of the maximum amplitude value to the minimum amplitude value in the second frequency domain signal is 0.695489 / 0.0561514, about 12.4, which is less than the corresponding ratio 31 of 1024QAM, and is significantly reduced compared with the corresponding ratio 69 of the existing OOK signal generation manner.

[0212] Due to the reduction of the ratio, the number of quantization bits required for accurately quantizing the OOK frequency domain signal can be reduced, the dynamic range of downlink power allocation is increased, and the flexibility of resource allocation on the network device side is improved. At the same time, by comparing FIG. 12 and FIG. 8, it can be found that the power of the OOK signal generated based on OFDM can be diverged in the frequency domain according to the scheme of the application, and will not be excessively concentrated, so the signal interference of the OOK signal on the specific frequency domain resource of the adjacent cell can also be reduced.

[0213] Based on the OOK signal generation method provided in the above embodiments, the embodiment of the application further provides a network device, which will be specifically described below with reference to the accompanying drawings. The network device can be a base station, for example, a next generation NodeB (gNB) in the NR system, or an evolved Node B (eNB), etc., which is not limited in the embodiment of the application.

[0214] Referring to FIG. 13, it is a schematic diagram of a network device provided by the embodiment of the application.

[0215] The network device 1100 shown in FIG. 13 includes a processor 1110, a memory 1120, and a transceiver 1130.

[0216] The processor 1110 is mainly used for baseband processing, controlling the network device, etc. The processor 1110 is usually the control center of the network device, and is used for controlling the network device to perform the OOK signal generation method in the foregoing method embodiments.

[0217] The memory 1120 is mainly used for storing computer program codes and data.

[0218] The transceiver 1130 is mainly used for transceiving radio frequency signals and converting radio frequency signals and baseband signals. Part of the transceiver 1130 can also be referred to as a transceiver, a transceiving circuit, etc.

[0219] The transceiving module of the transceiver 1130 can include an antenna 1133 and a radio frequency circuit (not shown in the figure), wherein the radio frequency circuit is mainly used for radio frequency processing.

[0220] Optionally, the device for realizing the receiving function in the transceiver 1130 can be regarded as a receiver 1032, and the device for realizing the sending function can be regarded as a transmitter 1031. The receiver 1032 can also be referred to as a receiving module, a receiver, or a receiving circuit, etc. The transmitter 1031 can be referred to as a transmitting module, a transmitter, or a transmitting circuit, etc.

[0221] The processor 1110 and the memory 1120 can include one or more single boards, each of which can include one or more processors and one or more memories.

[0222] The processor 1110 is used for reading and executing programs in the memory 1120 to realize the control of the network device. If there are multiple single boards, the single boards can be interconnected to enhance the processing capability. As an optional implementation, multiple single boards can share one or more processors, or multiple single boards can share one or more memories, or multiple single boards can share one or more processors at the same time.

[0223] For example, in an implementation, the transceiving module of the transceiver 1130 is used for sending information to an Ambient IoT device or receiving information sent by the Ambient IoT device. The processor 1110 is used for executing the OOK signal generation method in the foregoing method embodiments.

[0224] It should be understood that FIG. 13 is only an example and not a limitation. The network device described above including the processor, the memory, and the transceiver can not depend on the structure shown in FIG. 13.

[0225] The embodiments of the present application further provide a storage medium. The computer readable storage medium can be any available medium or data storage device that can be accessed by the computing device. The storage medium can be a magnetic medium (e.g., a floppy diskette, a hard disk drive, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state hard drive) or the like. The computer readable storage medium includes instructions that instruct the network device to perform the method for generating the OOK signal. The embodiments of the present application further provide another computer readable storage medium. The computer readable storage medium includes instructions that instruct the network device to perform the method for generating the OOK signal.

[0226] The embodiments of the present application further provide a computer program product including instructions. The computer program product can be software or a program product including instructions, which can be run on the network device or stored in any available medium. When the computer program product is run on the network device, the network device is enabled to perform the method for generating the OOK signal. The embodiments of the present application further provide a computer program product including instructions. When the computer program product is run on the network device, the network device is enabled to perform the method for generating the OOK signal.

[0227] It should be understood that, in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases of only A, only B, and A and B at the same time, wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, and c can be single or multiple.

[0228] The above-described and above-embodied examples are only used to illustrate the technical solutions of the present application, but not to limit the same. Although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features thereof. Such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A method of generating an OOK signal, characterized in that The method comprises the following steps of: determining a time domain signal segment of each high level segment included in an original on-off keying (OOK) signal, each bit signal of the original OOK signal comprising one high level segment and one low level segment; representing each time domain signal segment by a time domain signal sequence, wherein a sequence length of the time domain signal sequence is equal to a sequence length of the corresponding time domain signal segment, and at least two time domain signal sequences of the corresponding time domain signal sequence are different in time domain frequency points and each time domain frequency point is within a preset transmission bandwidth; concatenating each time domain signal sequence with each low level segment according to a time domain position to obtain a first time domain signal; and generating an orthogonal frequency division multiplexing (OFDM) symbol carrying the first OOK signal by using the first time domain signal. The method of claim 1, wherein The step of determining a time domain signal segment of each high level segment included in an original on-off keying (OOK) signal comprises the following steps of: dividing at least one high level segment of the original OOK signal into L time domain signal segments, wherein L is an integer greater than or equal to 2. The method of claim 1, wherein The step of determining a time domain signal segment of each high level segment included in an original on-off keying (OOK) signal comprises the following steps of: when the original OOK signal comprises only one bit signal, or when the original OOK signal comprises only one high level segment, or when the original OOK signal comprises only one low level segment, or when the original OOK signal comprises only two segments, dividing the high level segment of the original OOK signal into L time domain signal segments, wherein L is an integer greater than or equal to 2; when the original OOK signal comprises at least two bit signals, or when the original OOK signal comprises at least two high level segments, or when the original OOK signal comprises at least two low level segments, or when the original OOK signal comprises at least four segments, determining each high level segment of the original OOK signal as a time domain signal segment. The method of claim 1, wherein The time domain signal sequence corresponding to the ith time domain signal segment is a complex signal sequence a i The complex signal sequence a i (n) is specifically: wherein n = 0, 1,..., N-1, N is the number of sampling points included in the ith time domain signal segment, t s is a sampling time interval, for the pth component corresponding to the ith time domain signal segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of a pth component corresponding to the ith time domain signal segment, p = 0, 1, …, Q-1, and Q is a number of components corresponding to the ith time domain signal segment. The method of claim 1, wherein The time-domain signal sequence corresponding to the ith time-domain signal segment is a complex signal sequence a i The complex signal sequence a(t) is specifically: i The complex signal sequence a(t) is specifically: wherein t start,i≤ ≤ t < t start，i+1 , t start,i is the start time of the i-th time-domain signal segment, t start,i+1 is the start time of the i+1-th time-domain signal segment, for the pth component corresponding to the ith time-domain signal segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of a pth component corresponding to the ith time domain signal segment, p = 0, 1, …, Q-1, and Q is a number of components corresponding to the ith time domain signal segment. The method of claim 1, wherein The time domain signal sequence corresponding to the ith time domain signal segment is a real signal sequence a i The real signal sequence a i (n) is specifically: wherein n=0, 1, …, N-1, N is the number of sampling points included in the ith time domain signal segment, t s is a sampling time interval, a frequency point of the pth component corresponding to the ith time domain signal segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of a pth component corresponding to the ith time domain signal segment, p = 0, 1, …, Q-1, and Q is a number of components corresponding to the ith time domain signal segment. The method of claim 1, wherein The time-domain signal sequence corresponding to the ith time-domain signal segment is a real signal sequence a i The real signal sequence a i (t) is specifically: wherein t start,i ≤ t < t start,i+1 , t start,i is the start time of the i-th time-domain signal segment, t start,i+1 is the start time of the i+1-th time-domain signal segment, for the pth component corresponding to the ith time-domain signal segment, an amplitude of the pth component corresponding to the ith time-domain signal segment, a phase of a pth component corresponding to the ith time domain signal segment, p = 0, 1, …, Q-1, and Q is a number of components corresponding to the ith time domain signal segment. The method according to any one of claims 4-7, characterized in that said Af is the subcarrier spacing of the OFDM symbol, said K is a positive integer. The method according to claim 4 or 6, characterized in that K is a positive integer, and Δf·K is greater than or equal to the preset transmission bandwidth. The method according to claim 4 or 6, characterized in that The The Satisfies: The method according to claim 5 or 7, characterized in that The The Satisfies: The method of claim 1, wherein The step of generating an orthogonal frequency division multiplexing (OFDM) symbol carrying the first OOK signal by using the first time domain signal comprises the following steps of: performing Fourier transform on the first time domain signal to obtain a first frequency domain signal; performing clipping on the first frequency domain signal to obtain a second frequency domain signal; and performing inverse Fourier transform on the second frequency domain signal to obtain the OFDM symbol. map subcarriers of a second frequency domain signal onto a first number of subcarriers within the preset transmission bandwidth, the number of the subcarriers of the second frequency domain signal being the first number; when there is a corresponding frequency domain signal on other subcarriers within the preset transmission bandwidth except the first number of subcarriers, perform inverse Fourier transform on the mapped second frequency domain signal and the corresponding frequency domain signal on the other subcarriers together and add a cyclic prefix (CP) to generate an OFDM symbol carrying the first OOK signal; otherwise, perform inverse Fourier transform on the mapped second frequency domain signal and add a CP to generate an OFDM symbol carrying the first OOK signal. The method as claimed in claim 12, characterized in that the clipping of the first frequency domain signal to obtain a second frequency domain signal specifically comprises: reserving signal components of the first frequency domain signal within a first bandwidth on both sides of a target frequency point, the first bandwidth being less than or equal to the preset transmission bandwidth. A network device, characterized in that the network device comprises a processor and a memory; the processor is coupled with the memory; the memory is configured to store computer programs and / or instructions; the processor is configured to execute the computer programs and / or instructions stored in the memory to implement the method for generating an OOK signal according to any one of claims 1 to 13. A computer program product, characterized in that the computer program product comprises computer programs or instructions for implementing the method for generating an OOK signal according to any one of claims 1 to 13. A computer-readable storage medium, characterized by the computer readable storage medium stores computer programs or instructions, and when the computer programs or instructions run on a network device, the network device executes the method for generating an OOK signal according to any one of claims 1 to 13.

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