Communication method based on chirp spread spectrum hybrid modulation

Abstract

The invention discloses a communication method based on chirp spread spectrum hybrid modulation, and the method comprises the steps: first equipment carries out the CSS hybrid modulation of information bits according to first information, and transmits a first signal after the CSS hybrid modulation to second equipment; the second device receives the first signal according to second information, demodulates the first signal and obtains information bits, and the first signal is a signal for modulating an initial frequency sweeping frequency point of a frequency-modulated signal and the phase and / or amplitude of the frequency-modulated signal. By designing the chirp spread spectrum hybrid modulation method, the demodulation scheme and the corresponding signaling process, the spectrum efficiency of the communication system is effectively improved while low power consumption and long-distance communication of the communication system are ensured.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a communication method based on chirp spread spectrum hybrid modulation. Background Art

[0002] How to achieve low-power and long-distance communication transmission is the focus of attention in the fields of the Internet of Things and communication. Long Range Radio (LoRa) is a typical wide-area Internet of Things transmission technology that uses chirp spread spectrum (CSS) modulation to meet the transmission requirements of low power consumption and wide coverage.

[0003] However, existing communication systems based on CSS modulation (such as LoRa systems) use linearly swept chirp signals as signal waveforms and carry information by changing the starting sweep frequency point. Therefore, there are problems of being sensitive to co-frequency signals / adjacent-frequency interference. This results in CSS communication needing to use a large spreading factor to meet long-distance coverage, but reduces the frequency band utilization rate of the system, thereby leading to a low communication rate of the CSS communication system. For a CSS modulation communication system, its spectral efficiency is only SF / 2 SF bits / s / Hz. Taking the commonly used spreading factor SF = 7 in the LoRa system as an example, its spectral efficiency is only 0.0547 bits / s / Hz. Such a low frequency band efficiency limits CSS modulation to only be used in low-rate communication systems.

[0004] Therefore, how to improve the spectral efficiency of the CSS communication system while ensuring low-power and long-distance communication of the CSS communication system is a problem that needs to be solved currently. Summary of the Invention

[0005] In order to solve the problems in the prior art, the present invention designs a CSS hybrid modulation method, a demodulation scheme, and a corresponding signaling process, so that the communication system effectively improves the spectral efficiency while ensuring low-power and long-distance communication. The present invention is implemented by the following solutions:

[0006] A communication method based on chirp spread spectrum hybrid modulation CSS includes:

[0007] A first device performs CSS hybrid modulation on information bits according to first information to obtain a first signal, and sends the first signal after CSS hybrid modulation to a second device;

[0008] The second device receives the first signal according to second information and demodulates the first signal to obtain the information bits;

[0009] Wherein, the first signal is a signal for modulating the starting sweep frequency point of the frequency modulation signal and the phase and / or amplitude of the frequency modulation signal;

[0010] The first information includes at least one of the following: a first control command, first configuration information, first indication information; the second information includes at least one of the following: a second control command, second configuration information, second indication information.

[0011] As a further improvement of the present invention, the CSS hybrid modulation includes CSS-PSK hybrid modulation, CSS-ASK hybrid modulation or CSS-APSK hybrid modulation.

[0012] As a further improvement of the present invention, the indication method of the CSS hybrid modulation is to indicate by using a CSS hybrid modulation table.

[0013] As a further improvement of the present invention, the first information includes at least one of the following: indication information related to CSS modulation, indication information related to phase modulation, indication information related to amplitude modulation, indication information related to CSS hybrid modulation, the number of bits or the number of CSS hybrid modulation symbols to be transmitted or the maximum allowable transmission; wherein, the indication information related to CSS modulation includes at least one of the following: the number of frequency points L within the sweep frequency range, the total spreading factor SF = log 2 L, the starting sweep frequency point M (M ≤ L), or the number of bits m carried by one CSS modulation symbol = log 2 M, the CSS modulation signal bandwidth or sweep frequency range BW, the starting sweep frequency or frequency point of the CSS modulation signal, the cut-off sweep frequency or frequency point of the CSS modulation signal, the lowest sweep frequency or frequency point of the CSS modulation signal, the highest sweep frequency or frequency point of the CSS modulation signal, the slope of the sweep frequency of the CSS modulation signal, the symbol period or chip period of the CSS modulation signal, the sweep mode of the CSS modulation, the mapping method between the information bits and the starting sweep frequency point used for modulation; wherein, the sweep mode of the CSS modulation includes at least one of the following: the CSS sweep mode, including the up-chirp mode, down-chirp mode; the CSS frequency sweep mode, including the linear function sweep mode, non-linear quadratic function sweep mode, power function sweep mode, exponential function sweep mode, trigonometric function sweep mode; wherein, the indication information related to phase modulation includes at least one of the following: the phase modulation type, the phase modulation order, the mapping relationship between the information bits and the phase value in the phase modulation, the symbol rate or symbol period of the phase modulation, the ratio n of the symbol period of the phase modulation to the CSS symbol period 2 and the ratio 1 / n of the CSS symbol period to the symbol period of the phase modulation 2, the phase modulation type includes: relative phase modulation, absolute phase modulation; wherein, the indication information related to amplitude modulation includes at least one of the following: amplitude modulation type, amplitude modulation order, mapping relationship between information bits and amplitude or power in amplitude modulation, symbol rate or symbol period of amplitude modulation, ratio k of symbol period of amplitude modulation to CSS symbol period 2 , ratio 1 / k of CSS symbol period to symbol period of amplitude modulation 2 , the amplitude modulation type includes: relative amplitude modulation, absolute amplitude modulation; the indication information related to CSS hybrid modulation includes at least one of the following: CSS hybrid modulation type identifier or indication, modulation parameters mapped by the identified or indicated CSS hybrid modulation type.

[0014] As a further improvement of the present invention, the first information further includes at least one of the following: time resource of the first signal, frequency domain resource of the first signal, spatial domain resource of the first signal, polarization resource of the first signal, transmission power, power adjustment factor or amplification factor of the first signal, number of repeated transmissions of the first signal, frame structure parameters of the first signal; the time resource of the first signal includes at least one of the following: frame number, sub-frame number, number of time slots or time slot identifier, number of symbols or symbol identifier, signal period of the first signal, length of the first signal; the frequency domain resource of the first signal includes at least one of the following: BWP or BWP identifier, RBB or RBG identifier, BR or RB identifier, center frequency point / frequency or frequency point / frequency identifier, signal bandwidth or transmission bandwidth, protection bandwidth.

[0015] As a further improvement of the present invention, the second information includes at least one of the following: indication information related to CSS modulation, indication information related to phase modulation, indication information related to amplitude modulation, indication information related to CSS hybrid modulation, number of bits or number of CSS hybrid modulation symbols of CSS hybrid modulation to be transmitted or maximum allowable transmission; wherein, the indication information related to CSS modulation includes at least one of the following: number of frequency points L within the frequency sweep range, total spreading factor SF = log 2 L, starting frequency point number M (M≤L) of the frequency sweep, or number of bits m carried by one CSS modulation symbol = log 2M, the bandwidth of the CSS modulation signal or the sweep range BW, the starting sweep frequency or frequency point of the CSS modulation signal, the ending sweep frequency or frequency point of the CSS modulation signal, the lowest sweep frequency or frequency point of the CSS modulation signal, the highest sweep frequency or frequency point of the CSS modulation signal, the slope of the sweep frequency of the CSS modulation signal, the symbol period or chip period of the CSS modulation signal, the sweep mode of the CSS modulation, the mapping mode between the information bits and the starting sweep frequency point for modulation, the method of CSS despreading / demodulation; wherein, the sweep mode of the CSS modulation includes at least one of the following: the CSS sweep mode, including the up-chirp mode and the down-chirp mode; the CSS frequency sweep mode, including the linear function sweep mode, the non-linear quadratic function sweep mode, the power function sweep mode, the exponential function sweep mode, the trigonometric function sweep mode; the method of CSS despreading / demodulation includes the FFT demodulation method or the maximum likelihood demodulation method; wherein, the indication information related to the phase modulation includes at least one of the following: the phase modulation type, the phase modulation order, the mapping relationship between the information bits and the phase value in the phase modulation, the symbol rate or symbol period of the phase modulation, the ratio n of the symbol period of the phase modulation to the CSS symbol period 2 , the ratio 1 / n of the CSS symbol period to the symbol period of the phase modulation 2 , the phase modulation type includes: relative phase modulation, absolute phase modulation; wherein, the indication information related to the amplitude modulation includes at least one of the following: the amplitude modulation type, the amplitude modulation order, the mapping relationship between the information bits and the amplitude or power in the amplitude modulation, the symbol rate or symbol period of the amplitude modulation, the ratio k of the symbol period of the amplitude modulation to the CSS symbol period 2 , the ratio 1 / k of the CSS symbol period to the symbol period of the amplitude modulation 2 , the amplitude modulation type includes: relative amplitude modulation, absolute amplitude modulation; the indication information related to the CSS hybrid modulation includes at least one of the following: the CSS hybrid modulation type identifier or indication, the mapped modulation parameters of the identified or indicated CSS hybrid modulation type

[0016] As a further improvement of the present invention, the device for configuring or indicating the first information is one of the following:

[0017] The first device, that is, at this time the first device is both the sending end of the first signal and the device for configuring or indicating the first information;

[0018] The second device, that is, at this time the second device is both the receiving end of the first signal and the device for configuring or indicating the first information;

[0019] The third device, which is not the same as the first device and the second device, and is a core network node device, an application server device, or an access network device / network device with network scheduling functions.

[0020] As a further improvement of the present invention, the device for configuring or indicating the second information is one of the following:

[0021] The first device, that is, at this time, the first device is both the sender of the first signal and the device for configuring or indicating the second information;

[0022] The second device, that is, at this time, the second device is both the receiver of the first signal and the device for configuring or indicating the second information;

[0023] The third device, which is not the same as the first device and the second device, and is a core network node device, an application server device, or an access network device / network device with network scheduling functions.

[0024] As a further improvement of the present invention, the manner of carrying the first information / second information is one of the following:

[0025] RRC signaling or NAS signaling;

[0026] MAC-CE signaling or other MAC layer signaling;

[0027] Dynamic DCI signaling, SCI signaling, or other physical layer signaling;

[0028] Preamble signal or dedicated control command signal including indication information;

[0029] Factory configuration information or default configuration information.

[0030] As a further improvement of the present invention, the manner of carrying the first information / second information is configured simultaneously, and the final parameters related to CSS hybrid modulation and signal transmission are determined according to the priority; specifically, the first device supports both RRC configuration and DCI-based dynamic configuration. After entering the network, it always uses the parameters related to CSS hybrid modulation and signal transmission configured by RRC until it receives a DCI or L1 signaling for changing the first signal parameters, and then it changes the corresponding parameters related to CSS hybrid modulation and signal transmission.

[0031] As a further improvement of the present invention, the carrying manner of the first information / second information includes a combination of the above-mentioned multiple types; the third device and the second device respectively configure or indicate part of the first information / second information: the third device configures or indicates part of the first information / second information through RRC signaling, and the second device configures or indicates part of the first information / second information through MAC-CE, DCI, SCI or L1 signaling, and the two together form the complete first information.

[0032] The beneficial effects of the present invention are as follows: By designing the CSS hybrid modulation method and demodulation scheme, and the corresponding signaling process, the present invention enables the communication system to effectively improve the spectral efficiency of the communication system while ensuring low power consumption and long-distance communication. Brief Description of the Drawings

[0033] Fig. 1(a) shows an example of Sub-pattern 1 of the network deployment architecture without a third party device according to the present invention;

[0034] Fig. 1(b) shows an example of Sub-pattern 2 of the network deployment architecture without a third party device according to the present invention;

[0035] Fig. 2(a) shows an example of Sub-pattern 1 of the network deployment architecture with a third party device according to the present invention;

[0036] Fig. 2(b) shows an example of Sub-pattern 2 of the network deployment architecture with a third party device according to the present invention;

[0037] Fig. 2(c) shows an example of Sub-pattern 3 of the network deployment architecture with a third party device according to the present invention;

[0038] Fig. 2(d) shows an example of Sub-pattern 4 of the network deployment architecture with a third party device according to the present invention;

[0039] Fig. 2(e) shows an example of Sub-pattern 5 of the network deployment architecture with a third party device according to the present invention;

[0040] Figure 3 is the modulation schematic diagram of CSS-4PSK hybrid modulation according to the present invention (n 2 = 1);

[0041] Figure 4 is the modulation schematic diagram of CSS-4PSK hybrid modulation according to the present invention (n 2 = 2);

[0042] Figure 5 is the modulation schematic diagram of CSS-4PSK hybrid modulation according to the present invention (n 2 = 4);

[0043] Figure 6 is the modulation schematic diagram of CSS-4ASK hybrid modulation according to the present invention (k 2 = 1);

[0044] Figure 7 Modulation schematic diagram of CSS-4ASK hybrid modulation according to the present invention (k 2 = 2);

[0045] Figure 8 Modulation schematic diagram of CSS-4ASK hybrid modulation according to the present invention (k 2 = 4);

[0046] Figure 9 Modulation schematic diagram of CSS-(2,2)APSK hybrid modulation according to the present invention (n 2 = 1);

[0047] Figure 10 Modulation schematic diagram of CSS-(2,2)APSK hybrid modulation according to the present invention (n 2 = 2);

[0048] Figure 11 Modulation schematic diagram of CSS-(2,2)APSK hybrid modulation according to the present invention (n 2 = 4). Specific implementation manner

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0050] The solution of the present invention can be applied to communication systems such as LTE systems, 5G NR systems, NR evolution systems, 6G systems, 6G evolution systems, as well as IEEE 802.11 systems (WiFi systems), Bluetooth systems, LoRa, Zigbee systems, wireless optical communications, backscatter communications, Ambient IoT, etc.

[0051] First embodiment

[0052] In this embodiment, the signaling processes of data transmission between the first device and the second device based on the CSS hybrid modulation signal of the present invention will be given under several typical network deployment architectures.

[0053] In a typical architecture, there is no third-party device. One of the first device or the second device determines the first information and the second information, and this device (such as the second device) sends the first information or the second information to the other device (such as the first device). However, the device that sends the first signal is the first device, as shown in Figures 1(a) and 1(b). The first signal is a signal generated after CSS hybrid modulation. Optionally, it is a signal obtained by performing signal processing such as necessary synchronization and pilot insertion on the CSS hybrid modulation signal. This typical architecture includes the base station-UE communication mode, the UE-UE communication mode without network control in sidelink, the AP STA-STA mode in wifi, or the STA-STA (i.e., the wifi direct connection mode), the communication mode in Bluetooth / Zigbee, etc. That is, one of the communicating devices (taking the second device as an example here) has the ability to determine the CSS hybrid modulation and demodulation parameters and sends the first information to the peer device. It should be noted that in this architecture, it can also be the first device that determines the first information and the second information, and the first device sends the second information to the second device. Since the process is similar to the above, it will not be elaborated here.

[0054] In another architecture, in addition to the first device and the second device, there is also a third device, and the third device determines and configures the first information and / or the second information. According to whether the device that configures or indicates the first and second information is the first device, the second device, or the third device, it can be divided into 5 sub-modes. In the first sub-mode shown in Figure 2(a), the third device configures or indicates the second device with the second information. At the same time, the entity that configures the first information for the first device is the second device. This scenario is similar to the scenario where there is a master UE and a slave UE in sidelink, and the base station configures or indicates the second information of the master UE, and the master UE configures or indicates the first information of the slave UE. The sub-mode 2 shown in Figure 2(b) is similar to sub-mode 1. The third device configures or indicates the first device with the first information. At the same time, the entity that configures the second information for the second device is the first device. This scenario is similar to the scenario where there is a master UE and a slave UE in sidelink, and the base station configures or indicates the first information of the slave UE, but the slave UE indicates the second information of the master UE. In the third sub-mode shown in Figure 2(c), the entity that configures the first information and the second information for the first device and the second device is the third device. This scenario is similar to the scenario where there are UEs with equal capabilities in sidelink, and the base station configures the first information or the second information for the two UEs at the same time.

[0055] Furthermore, the entity that configures or indicates the first information for the first device or the entity that configures or indicates the second information for the second device is not the same device. In sub - mode 4 shown in Figure 2(d), the device that configures the first information for the first device can be the second device in addition to the third device. In one possible solution, for example, the third device can first configure multiple CSS hybrid modulation parameter patterns in the first device through RRC signaling, and the second device activates one of the CSS hybrid modulation parameter patterns through MAC - CE or other MAC - layer signaling, DCI, SCI, physical - layer signaling, etc. Or, the third device configures or indicates a part of the first information, and the second device configures or indicates a part of the first information, and the two together constitute the complete first information. Similarly, in sub - mode 5 shown in Figure 2(e), the device that configures the second information for the second device can be the first device in addition to the third device. In one possible solution, for example, the third device can first configure multiple CSS hybrid modulation parameter patterns in the second device through RRC signaling, and the first device activates one of the parameter patterns through MAC - CE or other MAC - layer signaling, DCI, SCI, physical - layer signaling, etc. Or, the third device configures or indicates a part of the second information, and the first device configures or indicates a part of the second information, and the two together constitute the complete second information.

[0056] Second Embodiment

[0057] In this embodiment, possible CSS hybrid modulation configuration or indication information will be given. Table 1 gives one example, that is, the CSS hybrid modulation table or mapping table. The indication bit related to CSS hybrid modulation is u bits, which represents 2 u different CSS hybrid modulation methods. At least one of the spreading factor, PSK type, and ASK type is different in different CSS hybrid modulation methods. For example, xx001xx maps to CSS hybrid modulation type 2. The spreading factor of the CSS hybrid modulation mapped by this modulation type is SF#2, the PSK modulation method or order used is type 2, and the ASK modulation method or order used is type 2, where different types can be flexibly configured; in addition, the PSK type may not exist, or the ASK type may not exist, and the solutions of the present invention do not make any limitations.

[0058] In addition, this CSS hybrid modulation table can be placed in the same MCS table as the coding method and code - rate mapping table, where Table 1 is only a part of the indication bits in this MCS table. Or, this CSS hybrid modulation table can be a separate table, that is, not in the same table as the coding method and code - rate mapping table. The solutions of the present invention do not make any limitations on these.

[0059] Table 1: CSS Hybrid Modulation Table or Mapping Table

[0060]

[0061]

[0062] Third Embodiment

[0063] In this embodiment, a modulation and demodulation design example of CSS-PSK hybrid modulation combining CSS modulation and phase modulation will be given. Each CSS-PSK hybrid modulation symbol carries m + n information bits, where the first m bits are carried or characterized by the starting sweep frequency point of the CSS-PSK hybrid modulation symbol, and the last n bits are carried or characterized by the phase of the CSS-PSK hybrid modulation symbol. Without loss of generality, since the phase modulation can be absolute phase modulation, relative phase modulation or differential phase modulation, and the modulation order of the phase modulation can also be flexibly configured or indicated. Without loss of generality, in this embodiment, CSS modulation with linear frequency sweep, SF = 4; absolute phase modulation is used for phase modulation, N 1 = 4, that is, 4PSK modulation is used; where the ratio n of the symbol period of the phase modulation to the CSS symbol period 2 = {1, 2, 4}. Among them, the starting sweep frequency in CSS modulation and the bits adopt Gray mapping, and the phase and bits in 4PSK modulation also adopt Gray mapping. The specific mapping methods are shown in Table 2 and Table 3.

[0064] Table 2: Mapping Table between Starting Sweep Frequency Points and Bits in CSS Modulation (SF = 4)

[0065]

[0066] Table 3: Mapping Table between Phase and Bits in 4PSK Modulation

[0067]

[0068] According to the mapping methods in Table 2 and Table 3, the mapping relationship of CSS-PSK hybrid modulation is obtained, as shown in Table 4. Note that Table 4 only gives one of the mapping methods, that is, the bits characterized by the starting sweep frequency of the CSS-PSK hybrid modulation symbol are placed in the first 4 bits, and the bits characterized by the phase of the CSS-PSK hybrid modulation symbol are placed in the last 2 bits; it is also possible to place the bits characterized by the phase of the CSS-PSK hybrid modulation symbol in the first 2 bits and the bits characterized by the starting sweep frequency of the CSS-PSK hybrid modulation symbol in the last 4 bits, and this solution does not exclude either.

[0069] Table 4: Bit Mapping Table of CSS + 4PSK Hybrid Modulation

[0070]

[0071]

[0072] According to the mapping method in Table 4, Figures 3 - 5 schematic diagrams of CSS-4PSK hybrid modulation under different n 2 configurations are respectively given.

[0073] As Figure 3 and Figure 5 shown, the starting sweep frequency points of the four CSS symbols are f low , Therefore, the first 4 bits of the CSS-PSK hybrid modulation symbols represented by them are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 = 1, it means that a CSS-PSK hybrid modulation symbol modulates one phase. This phase value can be the initial phase of the starting sweep frequency or the phases of all sweep frequency points, and this scheme does not make a limitation. At this time, Figure 3 the phase value of symbol 1 in the phase value of symbol 2 is the phase value of symbol 3 is the phase value of symbol 4 is Therefore, the last 2-bit information of each symbol from symbol 1 to symbol 4 is respectively "00", "01", "11", "10". Therefore, Figure 3 the bits represented by CSS-4PSK symbols 1, 2, 3, and 4 in

[0074] Figure 4 are respectively "000000", "011001", "110011", "111010". Among them, the first 4 bits of each symbol are represented by the starting sweep frequency of the CSS+4PSK hybrid modulation symbol, and the last 2 bits are represented by the phase of the CSS+4PSK hybrid modulation symbol. At this time, each CSS-4PSK hybrid modulation symbol carries 6-bit information, and the spectral efficiency is 0.375 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0074] Figure 4 In, the starting sweep frequency points of the four CSS symbols are f low , Therefore, the first 4 bits of the CSS hybrid modulation symbols represented by them are respectively "0000", "0110", "1100", "1110". At the same time, since n 2= 2, which indicates that two CSS-PSK hybrid modulation symbols modulate one phase. The phase value can be the initial phase of the starting sweep frequency or the phase of all sweep frequency points. This solution does not make a limitation. At this time, Figure 4 The phase value of symbol 1 in The phase value of symbol 2 is The phase value of symbol 3 is The phase value of symbol 4 is Therefore, the last 2-bit information of each symbol from symbol 1 to symbol 4 is respectively "00", "00", "11", "11". That is, at this time, since the phases of adjacent CSS-4PSK hybrid modulation symbols are the same, the phase dimension of two CSS-4PSK hybrid modulation symbols only carries two effective bit information. Therefore, Figure 4 The bits represented by CSS+4PSK symbol 1, symbol 2, symbol 3, and symbol 4 in

[0075] Figure 5 are respectively "000000", "011000", "110011", "111011". Among them, the first 4 bits of each symbol are represented by the starting sweep frequency of the CSS+4PSK hybrid modulation symbol, and the last 2 bits are represented by the phase of the CSS-4PSK hybrid modulation symbol. Then, at this time, each CSS-4PSK hybrid modulation symbol carries 5-bit information on average, and the spectral efficiency is 0.3125 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol when SF = 4 is only 0.25 bits / s / Hz. Therefore, the solution based on the present invention can effectively improve the spectral efficiency.

[0075] Figure 5 In, the starting sweep frequency points of the four CSS symbols are f low , Therefore, the first 4-bit information of the CSS hybrid modulation symbols represented by them are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 = 4, which indicates that four CSS-PSK hybrid modulation symbols modulate one phase. The phase value can be the initial phase of the starting sweep frequency or the phase of all sweep frequency points. This solution does not make a limitation. At this time, Figure 5 The phase values of symbol 1 to symbol 4 in are all Figure 5The bits represented by CSS+4PSK symbols 1, 2, 3, and 4 are respectively "000000", "011000", "110000", and "111001". Among them, the first 4 bits of each symbol are characterized by the starting sweep frequency of the CSS+4PSK mixed modulation symbol, and the last 2 bits are characterized by the phase of the CSS-4PSK mixed modulation symbol. At this time, each CSS-4PSK mixed modulation symbol carries 4.5 bits of information on average, and the spectral efficiency is 0.28215 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0076] After the first device completes the CSS-PSK mixed modulation, signal processing such as filtering and up-conversion can be performed on the modulated signal to generate a first signal. Optionally, a synchronization signal, a preamble, a pilot signal, etc. can be inserted into the first signal. Among them, the synchronization signal is used for signal synchronization; the preamble is used for channel estimation, time-frequency synchronization, etc.; the pilot signal is used for time-frequency synchronization, channel estimation, interference estimation, determination of demodulation threshold, etc. The position of the pilot signal can be flexibly placed, such as in front of, in the middle of, or at the back of the first signal, and the present invention does not limit it.

[0077] The second device receives the first signal and performs processing such as filtering and down-conversion on the first signal to obtain a CSS-PSK modulated signal in the baseband or intermediate frequency. Optionally, the second device can perform signal synchronization according to the synchronization signal associated with the first signal; perform channel estimation or precise time-frequency synchronization based on the preamble; perform time-frequency synchronization, channel estimation and channel equalization, interference estimation, and acquisition of the CSS demodulation threshold, etc. based on the pilot signal.

[0078] The characteristics of the CSS-PSK mixed modulation signal demodulated by the second device may include at least one of the following:

[0079] (1) Demodulating the CSS modulation signal using the FFT algorithm or the maximum likelihood algorithm

[0080] (a) Demodulating using the FFT algorithm:

[0081] The receiving end of the second device first performs mixing or de-chirping processing by using the reference down-chirp signal c * (t):

[0082]

[0083] After mixing to obtain s′(t; f n ), the receiving end performs FFT calculation and identifies the peak position of the frequency point in the frequency domain. And determine the starting sweep frequency f of the CSS modulation symbol according to the decision threshold n , and according to the mapping relationship between the starting sweep frequency and the input bits, the first m information bits after CSS hybrid modulation, where m = 4 in this example. Optionally, the second device may obtain the decision threshold according to the preamble and reference signal related to the first signal.

[0084] (b) Demodulate using the maximum likelihood detection ML algorithm

[0085] In another solution, by utilizing the orthogonality characteristic of the CSS signal, the receiving end performs correlation processing on the received CSS signal through M CSS basis functions, and searches for the basis function mapped by the maximum value of these M correlation values. The information bit represented by it is the modulation information bit of the CSS to be demodulated.

[0086] Assume that the CSS symbol to be demodulated is The demodulation end of the receiving end respectively uses different CSS basis functions x i (t, f n ), 1 ≤ i ≤ M and Perform correlation calculations, then the pth (1 ≤ p ≤ M) CSS symbol can be demodulated as:

[0087]

[0088] Among them, Is the conjugate of the ith basis function, P s Is the average power of the CSS signal received by the receiving end, ξ is the channel response between the first device and the second device, Is the noise power of the ith CSS symbol received by the receiving end.

[0089] Furthermore, the receiving end can perform a decision through the ML algorithm, so as to obtain the starting sweep frequency f i

[0090]

[0091] Furthermore, the receiving end demodulates the first m information bits after CSS hybrid modulation according to the mapping relationship between the starting sweep frequency and the input bits, where m = 4 in this example.

[0092] (2) Obtain the information of the last n bits according to the demodulation method of PSK.

[0093] According to the traditional PSK demodulation method, by first obtaining the phase of the starting sweep frequency point of each CSS hybrid modulation symbol, or the phases of all sweep frequencies within all such symbols; by making a decision on the phase with a threshold phase or a reference phase, and according to the mapping relationship between the phase and the bits, the last n-bit information of the CSS-PSK hybrid modulation symbol is demodulated. In this example, n = 2.

[0094] The advantage of CSS-PSK hybrid modulation is that by modulating the phase in the CSS-PSK hybrid modulation symbol, bit information can be carried without increasing additional power consumption, that is, the spectral efficiency can be improved on the basis of not increasing the power consumption of the CSS modulation communication system.

[0095] Fourth Embodiment

[0096] In this embodiment, a modulation and demodulation design example of CSS-ASK hybrid modulation combining CSS modulation and amplitude modulation will be given. Each CSS-ASK hybrid modulation symbol carries m + k information bits, where the first m bits are carried or characterized by the starting sweep frequency point of the CSS-ASK hybrid modulation symbol, and the last k bits are carried or characterized by the amplitude value of the CSS-ASK hybrid modulation symbol. Without loss of generality, since the amplitude modulation can be absolute phase modulation, relative amplitude modulation or differential amplitude modulation, and the modulation order of the amplitude modulation can also be flexibly configured or indicated. Without loss of generality, in this embodiment, CSS modulation with linear sweep is also used, SF = 4; the amplitude modulation uses absolute phase modulation, K 1 = 4, that is, 4ASK modulation is used; the ratio k of the symbol period of the phase modulation to the CSS symbol period 2 = (1, 2, 4).

[0097] Among them, the starting sweep frequency in the CSS modulation and the bits adopt the Gray mapping method, as shown in Table 2 in Embodiment 3; the phase and the bits in the 4ASK modulation also adopt the Gray mapping method, as shown in Table 5. Among them, the amplitude of 4ASK is represented in a normalized manner, that is, it is divided into 4 normalized level values, which are respectively 1. It can be understood that the actual value of this level value can be Q, where Q is the actual level value under a maximum power constraint or an average power constraint.

[0098] Table 5: Mapping Table between Amplitude Values and Bits in 4ASK Modulation

[0099]

[0100] According to the mapping methods in Table 2 and Table 5, the mapping relationship of CSS-ASK hybrid modulation is obtained, as shown in Table 6. Note that Table 6 only gives one of the mapping methods, that is, the bits represented by the starting sweep frequency of the CSS-ASK hybrid modulation symbol are placed in the first 4 bits, and the bits represented by the phase of the CSS-ASK hybrid modulation symbol are placed in the last 2 bits; it is also possible to place the bits represented by the phase of the CSS-ASK hybrid modulation symbol in the first 2 bits and the bits represented by the starting sweep frequency of the CSS-ASK hybrid modulation symbol in the last 4 bits, and this solution does not exclude either case.

[0101] Table 6: Bit Mapping Table of CSS+4ASK Hybrid Modulation

[0102]

[0103]

[0104] According to the mapping method in Table 6, Figures 6 - 8 schematic diagrams of CSS-4ASK hybrid modulation under different k 2 configurations are respectively given.

[0105] As Figure 6 and Figure 8 shown, the starting sweep frequency points of four CSS-4ASK hybrid modulation symbols are f low , Therefore, the first 4 bits of the CSS-4ASK hybrid modulation symbols represented by them are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 =1, it means that one CSS-4ASK hybrid modulation symbol modulates one amplitude value. At this time, Figure 6 the amplitude value of symbol 1 in the amplitude value of symbol 2 is the amplitude value of symbol 3 is the amplitude value of symbol 4 is 1. Therefore, the last 2-bit bit information of each symbol from symbol 1 to symbol 4 is respectively "00", "01", "11", "10". Therefore, Figure 6The bits represented by CSS-4ASK hybrid modulation symbols 1, 2, 3, and 4 in are respectively "000000", "011001", "110011", and "111010". Among them, the first 4 bits of each symbol are characterized by the starting sweep frequency of the CSS-4ASK hybrid modulation symbol, and the last 2 bits are characterized by the amplitude value of the CSS-4ASK hybrid modulation symbol. At this time, each CSS-4ASK hybrid modulation symbol carries 6 bits of information, and the spectral efficiency is 0.375 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0106] Figure 7 In, the starting sweep frequency points of the four CSS-4ASK hybrid modulation symbols are f low , Therefore, the first 4 bits of the CSS-4ASK hybrid modulation symbols they represent are respectively "0000", "0110", "1100", and "1110". At the same time, since k 2 = 2, which means that 2 CSS modulation symbols modulate one amplitude value, and the amplitude values of these two adjacent CSS-4ASK hybrid modulation symbols are the same. At this time, Figure 7 the amplitude value of symbol 1 of the amplitude value of symbol 2 is the amplitude value of symbol 3 is the amplitude value of symbol 4 is Therefore, the last 2 bits of information of each symbol from symbol 1 to symbol 4 are respectively "00", "00", "11", and "11". That is, at this time, since the amplitude values of adjacent CSS-4ASK hybrid modulation symbols are the same, then the amplitude values of 2 CSS-4ASK hybrid modulation symbols only carry 2 effective bit information. Therefore, Figure 7 the bits represented by CSS-4ASK symbols 1, 2, 3, and 4 in are respectively "000000", "011000", "110011", and "111011". Among them, the first 4 bits of each symbol are characterized by the starting sweep frequency of the CSS-4ASK hybrid modulation symbol, and the last 2 bits are characterized by the amplitude value of the CSS-4ASK hybrid modulation symbol. At this time, each CSS-4ASK hybrid modulation symbol carries an average of 5 bits of information, and the spectral efficiency is 0.3125 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0107] Figure 8Among them, the starting sweep frequency points of the four CSS-4ASK hybrid modulation symbols are f low , Therefore, the first 4 bits of the CSS-4ASK hybrid modulation symbols represented by them are "0000", "0110", "1100", and "1110" respectively. At the same time, since k 2 = 4, it indicates that 4 CSS-4ASK modulation symbols modulate one amplitude value, that is, the average amplitude values of these 4 adjacent CSS-4ASK modulation symbols are the same. At this time, Figure 8 the amplitude values of symbol 1 to symbol 4 of Therefore, the last 2-bit information of each symbol from symbol 1 to symbol 4 is "00", "00", "00", "00" respectively. That is, at this time, since the amplitude values of 4 adjacent CSS-4ASK hybrid modulation symbols are the same, only 2 effective bits of information are carried in the amplitude dimension of the 4 CSS-4ASK hybrid modulation symbols. Therefore, Figure 8 the bits represented by CSS+4ASK symbol 1, symbol 2, symbol 3, and symbol 4 in

[0108] After the first device completes CSS-ASK hybrid modulation, signal processing such as filtering and upconversion can be performed on the modulated signal to generate a first signal. Optionally, a synchronization signal, a preamble, a pilot signal, etc. can be inserted into the first signal. Among them, the synchronization signal is used for signal synchronization; the preamble is used for channel estimation, time-frequency synchronization, etc.; the pilot signal is used for time-frequency synchronization, channel estimation, interference estimation, demodulation threshold determination, etc. The position of the pilot signal can be flexibly placed, such as in front of, in the middle of, or behind the first signal, and the solution of the present invention does not limit it.

[0109] The second device receives the first signal and performs processing such as filtering and downconversion on the first signal to obtain a CSS-ASK hybrid modulation signal in baseband or intermediate frequency. Optionally, the second device can perform signal synchronization according to the synchronization signal associated with the first signal; perform channel estimation or precise time-frequency synchronization based on the preamble; perform time-frequency synchronization, channel estimation and channel equalization, interference estimation, and CSS demodulation threshold acquisition based on the pilot signal.

[0110] The features for the second device to demodulate the CSS-ASK hybrid modulation signal may include at least one of the following:

[0111] (1) Demodulate the first m information bits in the CSS modulation signal by using the FFT algorithm or the maximum likelihood algorithm. The specific method is the same as that in the first embodiment and will not be elaborated here.

[0112] (2) Obtain the information of the last k bits according to the demodulation method of ASK.

[0113] According to the traditional ASK demodulation method, first obtain the average amplitude of each CSS modulation symbol or the average amplitude value of adjacent k2 CSS modulation symbols of each CSS hybrid modulation symbol; make a decision on the amplitude value and the threshold amplitude value or the reference amplitude value, and according to the mapping relationship between the amplitude value and the bit, thus demodulate the last n bit information of the CSS-ASK hybrid modulation symbol. In this example, k = 2.

[0114] The advantage of CSS-ASK hybrid modulation is that additional bit information is carried by modulating the amplitude value in the CSS-PSK hybrid modulation symbol, and the modulation and demodulation of this hybrid modulation scheme are simple to implement; however, since ASK demodulation is sensitive to noise and interference, the CSS-ASK modulation communication system may have the disadvantage of degraded BER performance.

[0115] The Fifth Embodiment

[0116] In this embodiment, a design example of CSS-APSK hybrid modulation and demodulation will be given. That is, in addition to using the starting sweep frequency of CSS-APSK hybrid modulation to carry bit information, the phase and amplitude values of the sweep frequency in CSS-APSK hybrid modulation are also used to carry bit information. Each CSS-APSK hybrid modulation symbol carries m + n + k information bits, where the first m bits are carried or characterized by the starting sweep frequency point of the CSS modulation symbol, the middle n bits are carried or characterized by the phase of the CSS-APSK hybrid modulation symbol, and the last k bits are carried or characterized by the amplitude value of the CSS-APSK hybrid modulation. Of course, the order of the bits and the dimensions of the CSS-APSK hybrid modulation can also be flexibly designed. For example, the first n bits are carried or characterized by the phase of the CSS-APSK hybrid modulation; the middle m bits are carried or characterized by the starting sweep frequency point in the CSS-APSK hybrid modulation symbol; the last k information bits are carried or characterized by the amplitude value of the CSS-APSK hybrid modulation symbol. This scheme does not make any restrictions.

[0117] Since the phase modulation can be absolute phase modulation, relative phase modulation or differential phase modulation, and the modulation order of the phase modulation can also be flexibly configured or indicated; the amplitude modulation can be absolute amplitude modulation, relative amplitude modulation or differential amplitude modulation, and the modulation order of the amplitude modulation can also be flexibly configured or indicated. Without loss of generality, in this embodiment, the CSS modulation with linear frequency sweep is used, SF = 4; the phase modulation uses absolute phase modulation, N 1 = 2, that is, 2PSK modulation is used; the amplitude modulation uses absolute amplitude modulation, K 1 = 2, that is, 2ASK modulation is used; that is, at this time, it is (2,2)-APSK modulation or also called 4QAM modulation. Note that the values of N 1 and K 1 can be the same or different; the values of n 2 and k 2 can be the same or different; this scheme does not make any restrictions.

[0118] where the ratio n 2 of the symbol period of APSK modulation to the CSS symbol period = {1, 2, 4}. Among them, the starting sweep frequency in the CSS modulation and the bits adopt the Gray mapping method, as shown in Table 2 of Embodiment 3. The phase and bits in the (2,2)-ASK modulation also adopt the Gray mapping method, and the specific mapping method is shown in Table 7. Among them, the amplitude of ASK is represented by normalization, that is, it is divided into 2 normalized level values, which are respectively It can be understood that the actual value of this level value can be Q, where Q is the actual level value under a maximum power constraint or an average power constraint.

[0119] Table 7: Mapping table between phase and bits in (2,2)-APSK modulation

[0120]

[0121] According to the mapping methods in Table 2 and Table 7, the mapping relationship of CSS-APSK hybrid modulation is obtained, as shown in Table 8. Note that Table 8 only gives one of the mapping methods, that is, the bits represented by the starting sweep frequency of the CSS-APSK hybrid modulation symbol are placed in the first 4 bits, the bits represented by the phase of the CSS-APSK hybrid modulation symbol are placed in the middle 1 bit, and the bits represented by the amplitude value of the CSS-APSK hybrid modulation symbol are placed in the last 1 bit; it is also possible to place the bits represented by the phase of the CSS-APSK hybrid modulation symbol in the first 1 bit, the bits represented by the starting sweep frequency of the CSS-APSK hybrid modulation symbol in the middle 4 bits, and the bits represented by the amplitude value of the CSS-APSK hybrid modulation symbol in the last 1 bit, and this scheme does not exclude either.

[0122] Table 8: Bit Mapping Table of CSS+(2,2)-APSK Hybrid Modulation

[0123]

[0124]

[0125] According to the mapping method in Table 8, Figures 10 - 11 schematic diagrams of CSS-APSK hybrid modulation under different n 2 configurations are respectively given.

[0126] As Figure 10 and Figure 11 shown, the starting sweep frequency points of four CSS-APSK hybrid modulation symbols are f low , Therefore, the first 4 bits of the CSS-APSK hybrid modulation symbols represented by them are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 = 1, it indicates that one CSS-APSK hybrid modulation symbol modulates one phase and one amplitude value. This phase value can be the initial phase of the starting sweep frequency or the phase of all sweep frequency points, and this scheme does not make a limitation. At this time, Figure 10 the phase value and amplitude value of symbol 1 in the phase value and amplitude value of symbol 2 are the phase value and amplitude value of symbol 3 are the phase value and amplitude value of symbol 4 are Therefore, the last 2-bit information of each symbol from symbol 1 to symbol 4 is respectively "00", "01", "11", "10". Therefore, Figure 10 the bits represented by CSS+APSK symbols 1, 2, 3, and 4 in

[0127] Figure 10 are respectively "000000", "011001", "110011", "111010". Among them, the first 4 bits of each symbol are characterized by the starting sweep frequency of the CSS-APSK hybrid modulation symbol, the middle 1 bit is characterized by the phase of the CSS-APSK hybrid modulation symbol, and the last 1 bit is characterized by the amplitude value of the CSS-APSK hybrid modulation symbol. At this time, each CSS-APSK hybrid modulation symbol carries 6-bit information, and the spectral efficiency is 0.375 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0127] Figure 10 In, the starting sweep frequency points of four CSS-APSK hybrid modulation symbols are f low , Therefore, the first 4 bits of the CSS-APSK hybrid modulation symbols it represents are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 = 2, that is, it indicates that 2 CSS-APSK modulation symbols modulate one phase and one amplitude value. This phase value can be the initial phase of the starting sweep frequency or the phase of all sweep frequency points. This scheme is not limited. At this time, Figure 10 the phase value of symbol 1 and the phase value are the phase value of symbol 2 and the phase value are the phase value of symbol 3 and the phase value are the phase value of symbol 4 and the phase value are Therefore, the last 2-bit information of each symbol from symbol 1 to symbol 4 is respectively "00", "00", "11", "11". That is, at this time, since the phases and amplitudes of adjacent CSS-4PSK hybrid modulation symbols are the same, the phase dimension and amplitude dimension of 2 CSS-APSK hybrid modulation symbols only carry 2 effective bit information. Therefore, Figure 10 the bits represented by CSS+APSK symbol 1, symbol 2, symbol 3, and symbol 4 in

[0128] Figure 11 are respectively "000000", "011000", "110011", "111011". Among them, the first 4 bits of each symbol are represented by the starting sweep frequency of the CSS-APSK hybrid modulation symbol, the middle 1 bit is represented by the phase of the CSS-APSK hybrid modulation symbol, and the last 1 bit is represented by the amplitude value of the CSS-APSK hybrid modulation symbol. Then at this time, each CSS-APSK hybrid modulation symbol carries 5-bit information on average, and the spectral efficiency is 0.3125 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol when SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0128] Figure 11 In, the starting sweep frequency points of the four CSS-APSK hybrid symbols are f low , Therefore, the first 4 bits of the CSS-APSK hybrid modulation symbols it represents are respectively "0000", "0110", "1100", "1110". At the same time, since n 2 = 4, that is, it indicates that 4 CSS-APSK hybrid modulation symbols modulate one phase and one amplitude value. This phase value can be the initial phase of the starting sweep frequency or the phase of all sweep frequency points. This scheme is not limited. At this time, Figure 11 the phase values of symbol 1 to symbol 4 and the phase values are all Therefore, the last 2-bit information of each of the symbols 1 to 4 is "00", "00", "00", "00". That is, at this time, since the phases and amplitude values of 4 adjacent CSS-APSK hybrid modulation symbols are the same, the phase dimension and amplitude dimension of the 4 CSS-4PSK hybrid modulation symbols carry only 2 effective bit information. Therefore, Figure 11 the bits represented by the CSS+4PSK symbols 1, 2, 3, and 4 in Figure 11 are "000000", "011000", "110000", and "111001", respectively. Among them, the first 4 bits of each symbol are represented by the starting sweep frequency of the CSS-APSK hybrid modulation symbol, the middle 1 bit is represented by the phase of the CSS-APSK hybrid modulation symbol, and the last 1 bit is represented by the amplitude of the CSS-APSK hybrid modulation symbol. Then, at this time, each CSS-APSK hybrid modulation symbol carries an average of 4.5 bit information, and the spectral efficiency is 0.28215 bits / s / Hz; while the spectral efficiency of the CSS modulation symbol with SF = 4 is only 0.25 bits / s / Hz. Therefore, the scheme based on the present invention can effectively improve the spectral efficiency.

[0129] After the first device completes the CSS-APSK hybrid modulation, signal processing such as filtering and up-conversion can be performed on the modulated signal to generate a first signal. Optionally, a synchronization signal, a preamble, a pilot signal, etc. can be inserted into the first signal. Among them, the synchronization signal is used for signal synchronization; the preamble is used for channel estimation, time-frequency synchronization, etc.; the pilot signal is used for time-frequency synchronization, channel estimation, interference estimation, demodulation threshold determination, etc. The position of the pilot signal can be flexibly placed, such as in the front, middle, or back of the first signal, and the present invention scheme does not make any restrictions.

[0130] The second device receives the first signal and performs processing such as filtering and down-conversion on the first signal to obtain a CSS-APSK modulated signal in baseband or intermediate frequency. Optionally, the second device can perform signal synchronization according to the synchronization signal associated with the first signal; perform channel estimation or accurate time-frequency synchronization based on the preamble; perform time-frequency synchronization, channel estimation and channel equalization, interference estimation, and obtaining the threshold of CSS demodulation based on the pilot signal.

[0131] The features for the second device to demodulate the CSS-APSK hybrid modulation signal may include at least one of the following:

[0132] (1) Demodulate the ACSS modulation signal using the FFT algorithm or the maximum likelihood algorithm to obtain the first m bits. The specific scheme is similar to that in Embodiment 3 and will not be elaborated here.

[0133] (2) According to the demodulation method of APSK, the last n + k bit information is obtained. The specific schemes of ASK and PSK demodulation are similar to those in Embodiment 3 and will not be elaborated here.

[0134] The advantage of CSS-APSK hybrid modulation is that additional bit information is carried by modulating the amplitude and amplitude value in the CSS-PSK hybrid modulation symbol, so the spectral efficiency is the highest; or rather, under the same spectral efficiency, the BER performance is better than that of CSS-PSK and CSS-ASK. However, since CSS-APSK realizes modulation by additionally modulating the amplitude and phase dimensions, the modulation and demodulation complexity is relatively high.

[0135] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention. For those of ordinary skill in the art, without departing from the concept of the present invention, several simple deductions or substitutions can also be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A communication method based on chirp spread spectrum hybrid modulation CSS, characterized in that: The method comprises: The first device performs CSS hybrid modulation on the information bits according to the first information to obtain a first signal, and sends the first signal after CSS hybrid modulation to the second device; The second device receives the first signal according to second information, and demodulates the first signal to obtain the information bits; Wherein, the first signal is a signal for modulating the starting frequency sweep point of the frequency modulation signal and the phase and / or amplitude of the frequency modulation signal; The first information includes at least one of the following: a first control command, first configuration information, and first indication information; the second information includes at least one of the following: a second control command, second configuration information, and second indication information.

2. The communication method according to claim 1, wherein: The CSS hybrid modulation includes CSS-PSK hybrid modulation, CSS-ASK hybrid modulation or CSS-APSK hybrid modulation.

3. The communication method according to claim 1, wherein: The first information includes at least one of the following: indication information related to CSS modulation, indication information related to phase modulation, indication information related to amplitude modulation, indication information related to CSS hybrid modulation, the number of CSS hybrid modulation bits to be transmitted or the maximum number of CSS hybrid modulation symbols allowed to be transmitted; wherein, the indication information related to CSS modulation includes at least one of the following: the number of frequency points L within the frequency sweep range, the total spreading factor SF=log2L, the number of starting frequency sweep points M (M≤L), or the number of bits carried by a CSS modulation symbol m=log2M, the bandwidth of the CSS modulation signal or the sweep frequency. frequency range BW, the starting sweep frequency or frequency point of the CSS modulation signal, the cut-off sweep frequency or frequency point of the CSS modulation signal, the lowest sweep frequency or frequency point of the CSS modulation signal, the highest sweep frequency or frequency point of the CSS modulation signal, the slope of the sweep frequency of the CSS modulation signal, the symbol period or chip period of the CSS modulation signal, the sweep mode of CSS modulation, and the mapping method between the information bit and the starting sweep frequency point for modulation; wherein the sweep mode of CSS modulation includes at least one of the following: CSS sweep mode, including up-chirp mode and down-chirp mode; CSS frequency The frequency sweeping mode includes a linear function frequency sweeping mode, a nonlinear quadratic function frequency sweeping mode, a power function frequency sweeping mode, an exponential function frequency sweeping mode, and a trigonometric function frequency sweeping mode; wherein the indication information related to phase modulation includes at least one of the following: a phase modulation type, a phase modulation order, a mapping relationship between information bits and phase values ​​in phase modulation, a symbol rate or symbol period of phase modulation, a ratio of a symbol period of phase modulation to a CSS symbol period n2, a ratio of a CSS symbol period to a symbol period of phase modulation 1 / n2, and the phase modulation type includes: relative phase modulation and absolute phase modulation; wherein the indication information related to amplitude modulation includes at least one of the following: a phase modulation type, a phase modulation order, a mapping relationship between information bits and phase values ​​in phase modulation, a symbol rate or symbol period of phase modulation, a ratio of a symbol period of phase modulation to a CSS symbol period n2, a ratio of a CSS symbol period to a symbol period of phase modulation 1 / n2. The indication information related to CSS hybrid modulation includes at least one of the following: amplitude modulation type, amplitude modulation order, mapping relationship between information bits and amplitude or power in amplitude modulation, symbol rate or symbol period of amplitude modulation, ratio k2 of amplitude modulation symbol period to CSS symbol period, ratio 1 / k2 of CSS symbol period to amplitude modulation symbol period, the amplitude modulation type includes relative amplitude modulation and absolute amplitude modulation; the indication information related to CSS hybrid modulation includes at least one of the following: CSS hybrid modulation type identification or indication, the identified or indicated CSS hybrid modulation type maps the above-mentioned modulation parameters.

4. The communication method according to claim 1, wherein: The first information also includes at least one of the following: time resources of the first signal, frequency domain resources of the first signal, spatial domain resources of the first signal, polarization resources of the first signal, transmit power, power adjustment factor or amplification factor of the first signal, number of repeated transmissions of the first signal, frame structure parameters of the first signal; the time resources of the first signal include at least one of the following: frame number, subframe number, number of time slots or time slot identifier, number of symbols or symbol identifier, signal period of the first signal, length of the first signal; the frequency domain resources of the first signal include at least one of the following: BWP or BWP identifier, RBB or RBG identifier, BR or RB identifier, center frequency / frequency or frequency / frequency identifier, signal bandwidth or transmission bandwidth, protection bandwidth.

5. The communication method according to claim 1, wherein: The second information includes at least one of the following: indication information related to CSS modulation, indication information related to phase modulation, indication information related to amplitude modulation, indication information related to CSS hybrid modulation, the number of CSS hybrid modulation bits to be transmitted or the maximum number of CSS hybrid modulation symbols allowed to be transmitted; wherein, the indication information related to CSS modulation includes at least one of the following: the number of frequency points L within the frequency sweep range, the total spreading factor SF=log2L, the number of starting frequency sweep points M (M≤L), or the number of bits carried by a CSS modulation symbol m=log2M, the CSS modulation signal bandwidth or the frequency sweep range BW, the CSS modulation signal the starting sweep frequency or frequency point of the CSS modulation signal, the cut-off sweep frequency or frequency point of the CSS modulation signal, the lowest sweep frequency or frequency point of the CSS modulation signal, the highest sweep frequency or frequency point of the CSS modulation signal, the slope of the sweep frequency of the CSS modulation signal, the symbol period or chip period of the CSS modulation signal, the sweep mode of CSS modulation, the mapping method between the information bit and the starting sweep frequency point for modulation, and the CSS despreading / demodulation method; wherein the sweep mode of CSS modulation includes at least one of the following: CSS sweep mode, including up-chirp mode and down-chirp mode; CSS frequency sweep mode, including linear function The method of CSS despreading / demodulation includes FFT demodulation or maximum likelihood demodulation. The indication information related to phase modulation includes at least one of the following: phase modulation type, phase modulation order, mapping relationship between information bits and phase values ​​in phase modulation, symbol rate or symbol period of phase modulation, ratio of symbol period of phase modulation to CSS symbol period n2, ratio of CSS symbol period to symbol period of phase modulation 1 / n2. The phase modulation types include relative phase modulation, absolute ... Modulation; wherein the indication information related to amplitude modulation includes at least one of the following: amplitude modulation type, amplitude modulation order, mapping relationship between information bits and amplitude or power in amplitude modulation, symbol rate or symbol period of amplitude modulation, ratio k2 of amplitude modulation symbol period to CSS symbol period, ratio 1 / k2 of CSS symbol period to amplitude modulation symbol period, the amplitude modulation type includes: relative amplitude modulation and absolute amplitude modulation; the indication information related to CSS hybrid modulation includes at least one of the following: CSS hybrid modulation type identification or indication, the identified or indicated CSS hybrid modulation type maps the above-mentioned modulation parameters.

6. The communication method according to claim 1, wherein: The device for configuring or indicating the first information is one of the following: The first device, that is, at this time, the first device is a sender of the first signal and also a device for configuring or indicating the first information; The second device, that is, the second device is a receiving end of the first signal and also a device for configuring or indicating the first information; The third device is not the same device as the first device and the second device, and the third device is a core network node device, an application server device, or an access network device / network device with a network scheduling function.

7. The communication method according to claim 1, wherein: The device for configuring or indicating the second information is one of the following: The first device, that is, the first device is a transmitter of the first signal and also a device for configuring or indicating the second information; The second device, that is, the second device is a receiving end of the first signal and also a device for configuring or indicating the second information; The third device is not the same device as the first device and the second device, and the third device is a core network node device, an application server device, or an access network device / network device with a network scheduling function.

8. The communication method according to claim 1, wherein: The method of carrying the first information / second information is one of the following: RRC signaling or NAS signaling; MAC-CE signaling or other MAC layer signaling; Dynamic DCI signaling, SCI signaling or other physical layer signaling; A preamble signal or a dedicated control command signal including indication information; Factory configuration information or default configuration information.

9. The communication method according to claim 8, wherein: The method of carrying the first information / second information is configured simultaneously, and the final parameters related to the CSS hybrid modulation and signal transmission are determined according to the priority; specifically, the first device supports both RRC configuration and dynamic configuration based on DCI, and after entering the network, the parameters related to the CSS hybrid modulation and signal transmission configured by RRC are always used, until the DCI or L1 signaling that changes the first signal parameters is received, and then the corresponding parameters related to the CSS hybrid modulation and signal transmission are changed.

10. The communication method according to claim 8, wherein: The carrying method of the first information / second information includes a combination of the above-mentioned multiple types; the third device and the second device respectively configure or indicate part of the first information / second information: the third device configures or indicates part of the first information / second information through RRC signaling, and the second device configures or indicates part of the first information / second information through MAC-CE, DCI, SCI or L1 signaling, and the two constitute the complete first information.

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