Communication method of scattering communication system

Abstract

The present invention provides a communication method of a scattering communication system, which is applied to a scattering communication system, the system includes a transmitting end and a receiving end, and the communication frequency bands of the transmitting end and the receiving end are pre-divided into N channels; the method includes: the transmitting end sends channel detection signals to the receiving end through the N channels respectively, the receiving end obtains the channel quality of the N channels according to the channel detection signals received from each channel and sends a signaling feedback signal to the transmitting end, the transmitting end obtains the target channel and the modulation and coding mode corresponding to the target channel according to the signaling feedback signal, wherein the target channel is the channel with the highest channel quality among the N channels; the transmitting end processes the service data according to the modulation and coding mode corresponding to the target channel to obtain the service communication signal, and sends the service communication signal to the receiving end through the target channel. The transmitting end and the receiving end can be a single-antenna transmitting end and a single-antenna receiving end, which improves the portability of the scattering communication system.

Description

Technical Field

[0001] The present invention belongs to the technical field of scattering communication, and in particular relates to a communication method of a scattering communication system. Background Art

[0002] Tropospheric scatter communication is a beyond-line-of-sight communication method that uses the reflection and scattering of electromagnetic waves by the inhomogeneity of the atmosphere in the troposphere. Tropospheric scatter communication has the characteristics of long single-hop communication distance, strong obstacle crossing ability, high reliability, good resistance to nuclear explosion and anti-interception, etc. It is an important military and civilian wireless communication method.

[0003] Tropospheric scatter channels have large path loss, and also suffer from severe time-varying fading due to scatterer motion and multipath propagation. To solve the problem of channel fading, the existing technology usually adopts an adaptive frequency-selective scattering communication method based on spatial diversity. However, the application of this method relies on a multi-antenna scattering communication system, which has large equipment, poor portability, and high cost. Summary of the invention

[0004] In view of this, the present invention provides a communication method of a scattering communication system, which can improve the portability of equipment of the scattering communication system.

[0005] A first aspect of an embodiment of the present invention provides a communication method of a scattering communication system, the method being applied to a transmitting end of a scattering communication system, the scattering communication system further comprising a receiving end, the communication frequency bands of the transmitting end and the receiving end being pre-divided into N channels; the method comprising:

[0006] Sending channel detection signals to the receiving end through the N channels respectively, so that the receiving end obtains channel quality of the N channels according to the channel detection signal received from each channel;

[0007] Receiving a signaling feedback signal sent by the receiving end, and acquiring a target channel and a modulation and coding mode corresponding to the target channel according to the signaling feedback signal, wherein the target channel is a channel with the highest channel quality among the N channels;

[0008] The service data is processed according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and the service communication signal is sent to the receiving end through the target channel.

[0009] In a possible implementation manner, sending the channel detection signal to the receiving end through the N channels respectively includes:

[0010] After the channel detection signal is subjected to shaping filtering and up-conversion processing, it is sent to the receiving end through the N channels respectively.

[0011] In one possible implementation, the channel detection signal is composed of a constant envelope zero autocorrelation CAZAC sequence, the symbol rate of the channel detection signal, the signaling feedback signal and the service communication signal are the same, and the channel detection signal, the signaling feedback signal and the service communication signal are formed in the same manner.

[0012] In a possible implementation manner, acquiring a target channel and a modulation and coding mode corresponding to the target channel according to the signaling feedback signal includes:

[0013] The receiving frequency is synchronized to the transmitting frequency by down-conversion, and the signaling feedback signal is demodulated, despread and signaling decoded to obtain the target channel and the modulation and coding mode corresponding to the target channel.

[0014] In a possible implementation manner, the processing the service data according to the modulation and coding mode corresponding to the target channel includes:

[0015] According to the modulation and coding mode corresponding to the target channel, the service data is channel coded, channel interleaved, modulated and up-converted.

[0016] In a possible implementation, the shortest frequency switching time corresponding to the frequency converter of the transmitting end is a first duration, the signal duration of the channel detection signal is a second duration, and the second duration is greater than or equal to the first duration.

[0017] A second aspect of an embodiment of the present invention provides a communication method of a scattering communication system, the method being applied to a receiving end of a scattering communication system, the scattering communication system further comprising a transmitting end, the communication frequency bands of the receiving end and the transmitting end being pre-divided into N channels; the method comprising:

[0018] Receiving channel detection signals sent by the transmitting end from the N channels respectively;

[0019] sorting the channel qualities of the N channels according to the channel detection signal received from each channel;

[0020] Selecting a channel with the best channel quality as a target channel according to the sorting result, and obtaining a modulation and coding mode corresponding to the target channel according to the channel quality of the target channel;

[0021] A signaling feedback signal is sent to the transmitting end, wherein the signaling feedback signal includes identification information of the target channel and a modulation and coding method corresponding to the target channel, so that the transmitting end processes the service data according to the modulation and coding method corresponding to the target channel to obtain a service communication signal, and sends the service communication signal to the receiving end through the target channel.

[0022] In a possible implementation manner, the receiving, from the N channels respectively, channel sounding signals sent by a transmitting end includes:

[0023] The receiving frequency is synchronized to the transmitting frequency by down-conversion, and the channel detection signals sent by the transmitting end are received from the N channels respectively and matched filtering is performed;

[0024] The sorting of the channel qualities of the N channels according to the channel detection signal received from each channel comprises:

[0025] The signal-to-noise ratio and / or bit error rate of each channel is acquired according to the channel detection signal received from each channel, and the channel qualities of the N channels are sorted in descending order according to the signal-to-noise ratio and / or bit error rate of each channel.

[0026] In a possible implementation manner, the sending a signaling feedback signal to the transmitting end includes:

[0027] After signaling coding, spectrum spreading, modulation and up-conversion processing are performed on the identification information of the target channel and the modulation and coding mode corresponding to the target channel, a signaling feedback signal is obtained and sent to the transmitting end.

[0028] In a possible implementation, the moment when the transmitting end sends a channel detection signal to the receiving end is a first moment, the moment when the receiving end sends a signaling feedback signal to the transmitting end is a second moment, and the time interval between the second moment and the first moment is a preset time interval.

[0029] The embodiment of the present invention provides a communication method for a scattering communication system, wherein the communication frequency bands of a transmitting end and a receiving end are pre-divided into N channels, and the transmitting end sends a channel detection signal to a receiving end through the N channels respectively; the receiving end obtains the channel quality of the N channels according to the channel detection signal received from each channel and sends a signaling feedback signal to the transmitting end; the transmitting end obtains a target channel and a modulation and coding method corresponding to the target channel according to the signaling feedback signal, wherein the target channel is the channel with the highest channel quality among the N channels; the service data is processed according to the modulation and coding method corresponding to the target channel to obtain a service communication signal, and the service communication signal is sent to the receiving end through the target channel, i.e., the channel with the highest channel quality among the N channels. Through the communication method for a scattering communication system provided by the embodiment of the present invention, the transmitting end and the receiving end can be a single-antenna transmitting end and a single-antenna receiving end, thereby improving the portability of the scattering communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is a flow chart of an implementation of a communication method of a scattering communication system provided by an embodiment of the present invention;

[0032] Figure 2 is a flow chart of another communication method of a scattering communication system provided by an embodiment of the present invention;

[0033] Figure 3 is a flow chart of another communication method of a scattering communication system provided by an embodiment of the present invention;

[0034] Figure 4 It is a structural diagram of a transmitting end device or a receiving end device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0037] See also Figure 1 , which shows a flow chart of an implementation of a communication method of a scattering communication system provided by an embodiment of the present invention, the method is applied to a transmitting end of a scattering communication system, the scattering communication system also includes a receiving end, the communication frequency bands of the transmitting end and the receiving end are pre-divided into N channels, optionally, the transmitting end and the receiving end are single antenna devices, and the details are as follows:

[0038] S101 , sending channel detection signals to a receiving end through N channels respectively, so that the receiving end obtains channel quality of the N channels according to the channel detection signal received from each channel.

[0039] Optionally, the transmitting end performs shaping filtering and up-conversion processing on the channel detection signal and then sends it to the receiving end through N channels respectively.

[0040] Optionally, the detection signal subjected to shaping filtering processing at the transmitting end is a baseband channel detection signal.

[0041] Optionally, the channel spacing of the N channels is greater than the channel coherence bandwidth. For example, the communication frequency bands of the transmitting end and the receiving end are pre-divided into 8 channels.

[0042] The receiving end receives a channel detection signal from each channel and obtains the channel quality of N channels.

[0043] S102, receiving a signaling feedback signal sent by a receiving end, and acquiring a target channel and a modulation and coding scheme corresponding to the target channel according to the signaling feedback signal, wherein the target channel is a channel with the highest channel quality among the N channels.

[0044] The transmitting end synchronizes its receiving frequency to the transmitting frequency by down-converting, and performs demodulation, despreading and signaling decoding processing on the signaling feedback signal to obtain the target channel and the modulation and coding mode corresponding to the target channel.

[0045] S103, processing the service data according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and sending the service communication signal to the receiving end through the target channel.

[0046] Optionally, the process of processing the service data by the transmitting end includes: performing channel coding, channel interleaving, modulation and up-conversion processing on the service data according to the modulation and coding mode corresponding to the target channel.

[0047] Through the above method, the transmitting end obtains the channel with the best channel quality among the N channels and the modulation and coding method suitable for the channel. The service data is processed by the modulation and coding method corresponding to the channel with the best channel quality to obtain the service communication signal, and then the service communication signal is sent to the receiving end through the channel with the best channel quality.

[0048] Optionally, the channel detection signal is composed of a constant envelope zero autocorrelation CAZAC sequence. The CAZAC sequence has a zero autocorrelation characteristic, which enables more complete channel detection, more accurate quality assessment, and better frequency selection performance, thereby making the application scenarios of the method provided in the embodiment of the present application more extensive.

[0049] Optionally, the channel sounding signal may use a Frank-Zadoff-Chu sequence in a CAZAC sequence.

[0050] Optionally, the symbol rates of the channel detection signal, the signaling feedback signal, and the service communication signal are the same, and the channel detection signal, the signaling feedback signal, and the service communication signal are formed in the same manner. In this way, the channel condition detected by the detection signal is more consistent with the channel condition when the service communication signal is transmitted.

[0051] Alternatively, the shortest frequency switching time corresponding to the frequency converter of the transmitting end is a first duration, the signal duration of the channel detection signal is a second duration, and the second duration is greater than or equal to the first duration.

[0052] If the second duration is shorter than the first duration, the inverter cannot support it, resulting in signal distortion.

[0053] For example, if the frequency converter at the transmitting end supports 10,000 hops per second, the duration of the channel detection signal is not less than 100 microseconds.

[0054] As can be seen from the above, the present invention performs real-time detection and signaling feedback on N channels at the transmitting end and the receiving end, so that the business communication can keep working on the communication channel with the best channel quality, thereby improving power utilization and having a higher data transmission rate. In addition, the transmitting end and the receiving end only need to be single-antenna devices to implement the method of the present invention, which greatly improves the convenience of the scattering communication system.

[0055] Figure 2 A flow chart of an implementation method of a scattering communication system provided by an embodiment of the present invention is shown. The method is applied to a receiving end of a scattering communication system. The scattering communication system also includes a transmitting end. The communication frequency bands of the receiving end and the transmitting end are pre-divided into N channels. Optionally, both the transmitting end and the receiving end are single antenna devices. The details are as follows:

[0056] S201, receiving channel detection signals sent by a transmitting end from N channels respectively.

[0057] Optionally, the receiving end synchronizes its receiving frequency to the transmitting frequency by down-converting, receives channel detection signals sent by the transmitting end from N channels respectively, and performs matched filtering processing.

[0058] S202: Sort the channel qualities of N channels according to the channel detection signal received from each channel.

[0059] Optionally, the signal-to-noise ratio and / or bit error rate of each channel is obtained according to the channel detection signal received from each channel, and the channel qualities of the N channels are sorted in descending order according to the signal-to-noise ratio and / or bit error rate of each channel.

[0060] S203, selecting a channel with the best channel quality as a target channel according to the ranking result, and obtaining a modulation and coding scheme corresponding to the target channel according to the channel quality of the target channel.

[0061] For example, if the receiving end sorts the channel qualities of N channels according to the signal-to-noise ratio of each channel, the channel with the highest signal-to-noise ratio is the target channel, and the modulation and coding mode corresponding to the signal-to-noise ratio of the target channel is the modulation and coding mode corresponding to the target channel.

[0062] S204, sending a signaling feedback signal to the transmitting end, the signaling feedback signal includes the identification information of the target channel and the modulation and coding method corresponding to the target channel, so that the transmitting end processes the service data according to the modulation and coding method corresponding to the target channel, obtains the service communication signal, and sends the service communication signal to the receiving end through the target channel.

[0063] Optionally, the receiving end performs signaling encoding, spread spectrum, modulation and up-conversion on the identification information of the target channel and the modulation and coding mode corresponding to the target channel, obtains a signaling feedback signal and sends it to the transmitting end.

[0064] Optionally, the moment when the transmitting end sends the channel detection signal to the receiving end is the first moment, the moment when the receiving end sends the signaling feedback signal to the transmitting end is the second moment, and the time interval between the second moment and the first moment is a preset time interval.

[0065] A communication process of the communication method of the embodiment of the present application is a frequency selection frame, and optionally, the second moment is delayed by half a frequency selection frame compared to the first moment. For example, if a frequency selection frame is 5ms, the second moment is delayed by 2.5ms compared to the first moment.

[0066] In this way, it is ensured that the transmitting end can obtain the modulation and coding mode corresponding to the target channel before transmitting the service data.

[0067] Furthermore, after receiving the service communication signal, the receiving end demodulates the service data after down-conversion, demodulation, channel deinterleaving and channel decoding.

[0068] As can be seen from the above, the present invention performs real-time detection and signaling feedback on N channels at the transmitting end and the receiving end, so that the business communication can keep working on the communication channel with the best channel quality, thereby improving power utilization and having a higher data transmission rate. In addition, the transmitting end and the receiving end only need to be single-antenna devices to implement the method of the present invention, which greatly improves the convenience of the scattering communication system.

[0069] Figure 3 A flow chart of an implementation of a communication method of a scattering communication system provided by an embodiment of the present invention is shown. The method is applied to a scattering communication system. The scattering communication system includes a transmitting end and a receiving end. The communication frequency bands of the transmitting end and the receiving end are pre-divided into N channels. Optionally, the transmitting end and the receiving end are both single-antenna devices. The details are as follows:

[0070] S301, the transmitting end sends channel detection signals to the receiving end through N channels respectively.

[0071] S302: The receiving end sorts the channel qualities of N channels according to the channel detection signal received from each channel.

[0072] S303, the receiving end selects the channel with the best channel quality as the target channel according to the sorting result, and obtains the modulation and coding mode corresponding to the target channel according to the channel quality of the target channel.

[0073] S304, the receiving end sends a signaling feedback signal to the transmitting end, where the signaling feedback signal includes identification information of the target channel and a modulation and coding mode corresponding to the target channel.

[0074] S305, the transmitting end receives the signaling feedback signal, and acquires the target channel and the modulation and coding scheme corresponding to the target channel according to the signaling feedback signal.

[0075] S306, the transmitting end processes the service data according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and sends the service communication signal to the receiving end through the target channel.

[0076] S307, the receiving end receives the service communication signal and parses it to obtain service data.

[0077] As can be seen from the above, the present invention performs real-time detection and signaling feedback on N channels at the transmitting end and the receiving end, so that the business communication can keep working on the communication channel with the best channel quality, thereby improving power utilization and having a higher data transmission rate. In addition, the transmitting end and the receiving end only need to be single-antenna devices to implement the method of the present invention, which greatly improves the convenience of the scattering communication system.

[0078] Optionally, steps S301 to S307 can be regarded as a frequency selection process. After completing step S307, the process loops to step S301 to perform the next frequency selection process until the transmitting end and the receiving end finish their work.

[0079] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0080] Figure 4 FIG. 1 is a schematic diagram showing the structure of a transmitting end device provided by an embodiment of the present invention. For the sake of convenience, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows: Figure 4 As shown, the transmitting end device includes a data processing module 41 and a signal transceiver module 42. Optionally, the signal transceiver module 42 is composed of a single antenna. The transmitting end device communicates with the receiving end device in the scattering communication system. The communication frequency band between the transmitting end device and the receiving end device is pre-divided into N channels. The transmitting end device is used for:

[0081] The signal transceiver module 42 sends channel detection signals to the receiving end device through N channels respectively, so that the receiving end device obtains the channel quality of the N channels according to the channel detection signal received from each channel;

[0082] The data processing transceiver module receives the signaling feedback signal sent by the receiving end device, and the data processing module 41 obtains the target channel and the modulation and coding mode corresponding to the target channel according to the signaling feedback signal, wherein the target channel is the channel with the highest channel quality among the N channels;

[0083] The data processing module 41 processes the service data according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and the data processing transceiver module sends the service communication signal to the receiving end device through the target channel.

[0084] Optionally, after the data processing module 41 performs shaping filtering and up-conversion processing on the channel detection signal, the data processing transceiver module sends it to the receiving end device through N channels respectively.

[0085] Optionally, the channel detection signal is composed of a constant envelope zero autocorrelation CAZAC sequence, the symbol rate of the channel detection signal, the signaling feedback signal and the service communication signal are the same, and the channel detection signal, the signaling feedback signal and the service communication signal are formed in the same manner.

[0086] Optionally, the signal processing module synchronizes its own receiving frequency to the transmitting frequency by down-conversion, and performs demodulation, despreading and signaling decoding on the signaling feedback signal to obtain the target channel and the modulation and coding method corresponding to the target channel.

[0087] Optionally, the data processing module 41 performs channel coding, channel interleaving, modulation and up-conversion processing on the service data according to the modulation and coding mode corresponding to the target channel.

[0088] Optionally, the transmitting end device includes a frequency converter, the shortest frequency switching time corresponding to the frequency converter of the transmitting end device is a first duration, the signal duration of the channel detection signal is a second duration, and the second duration is greater than or equal to the first duration.

[0089] As can be seen from the above, the present invention performs real-time detection and signaling feedback on N channels of the transmitting device and the receiving device, so that the business communication can maintain working on the communication channel with the best channel quality, thereby improving power utilization and having a higher data transmission rate. In addition, the transmitting device and the receiving device only need to be single-antenna devices to implement the method of the present invention, which greatly improves the convenience of the scattering communication system.

[0090] Figure 4It can also be a structural diagram of a receiving end device provided by an embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows: Figure 4 As shown, the receiving device includes a data processing module 41 and a signal transceiver module 42. Optionally, the signal transceiver module 42 is composed of a single antenna. The receiving device communicates with the transmitting device in the scattering communication system. The communication frequency band between the receiving device and the transmitting device is pre-divided into N channels. The receiving device is used to:

[0091] The signal transceiver module 42 receives channel detection signals sent by the transmitter from N channels respectively;

[0092] The data processing module 41 sorts the channel qualities of the N channels according to the channel detection signal received from each channel;

[0093] The data processing module 41 selects the channel with the best channel quality as the target channel according to the sorting result, and obtains the modulation and coding mode corresponding to the target channel according to the channel quality of the target channel;

[0094] The signal transceiver module 42 sends a signaling feedback signal to the transmitting device, and the signaling feedback signal includes the identification information of the target channel and the modulation and coding method corresponding to the target channel, so that the transmitting device processes the service data according to the modulation and coding method corresponding to the target channel, obtains the service communication signal, and sends the service communication signal to the receiving end through the target channel.

[0095] Optionally, the data processing module 41 synchronizes its receiving frequency to the transmitting frequency by down-converting, receives the channel detection signals sent by the transmitting end device from N channels respectively, and performs matched filtering processing;

[0096] Optionally, the data processing module 41 obtains the signal-to-noise ratio and / or bit error rate of each channel according to the channel detection signal received from each channel, and sorts the channel qualities of the N channels in descending order according to the signal-to-noise ratio and / or bit error rate of each channel.

[0097] Optionally, the data processing module 41 performs signaling encoding, spread spectrum, modulation and up-conversion on the identification information of the target channel and the modulation and coding method corresponding to the target channel, obtains a signaling feedback signal and sends it to the transmitting end device through the signal transceiver module 42.

[0098] Optionally, the moment when the transmitting device sends a channel detection signal to the receiving device is a first moment, the moment when the receiving device sends a signaling feedback signal to the transmitting device is a second moment, and the time interval between the second moment and the first moment is a preset time interval.

[0099] As can be seen from the above, the present invention performs real-time detection and signaling feedback on N channels of the transmitting device and the receiving device, so that the business communication can maintain working on the communication channel with the best channel quality, thereby improving power utilization and having a higher data transmission rate. In addition, the transmitting device and the receiving device only need to be single-antenna devices to implement the method of the present invention, which greatly improves the convenience of the scattering communication system.

[0100] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A communication method of a scattering communication system, characterized in that: The method is applied to a transmitting end of a scattering communication system, the scattering communication system also includes a receiving end, the transmitting end and the receiving end are single antenna devices; The communication frequency bands of the transmitting end and the receiving end are pre-divided into N channels; The method includes: Sending channel detection signals to the receiving end through the N channels respectively, so that the receiving end obtains channel quality of the N channels according to the channel detection signal received from each channel; Receiving a signaling feedback signal sent by the receiving end, and acquiring a target channel and a modulation and coding mode corresponding to the target channel according to the signaling feedback signal, wherein the target channel is a channel with the highest channel quality among the N channels; Processing the service data according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and sending the service communication signal to the receiving end through the target channel; The receiving end is used to obtain the signal-to-noise ratio and / or bit error rate of each channel according to the channel detection signal received from each channel, and sort the channel qualities of the N channels in descending order according to the signal-to-noise ratio and / or bit error rate of each channel; According to the sorting result, a channel with the best channel quality is selected as a target channel, and a modulation and coding mode corresponding to the target channel is obtained according to the channel quality of the target channel; Among them, the channel detection signal is composed of a Frank-Zadoff-Chu sequence in a constant envelope zero autocorrelation CAZAC sequence, the symbol rate of the channel detection signal, the signaling feedback signal and the service communication signal are the same, and the shaping method of the channel detection signal, the signaling feedback signal and the service communication signal is the same.

2. The method according to claim 1, characterized in that The sending of channel detection signals to the receiving end through the N channels respectively comprises: After the channel detection signal is subjected to shaping filtering and up-conversion processing, it is sent to the receiving end through the N channels respectively.

3. The method according to claim 1, characterized in that The acquiring the target channel and the modulation and coding mode corresponding to the target channel according to the signaling feedback signal comprises: The receiving frequency is synchronized to the transmitting frequency by down-conversion, and the signaling feedback signal is demodulated, despread and signaling decoded to obtain the target channel and the modulation and coding mode corresponding to the target channel.

4. The method according to claim 1, characterized in that The processing of the service data according to the modulation and coding mode corresponding to the target channel includes: According to the modulation and coding mode corresponding to the target channel, the service data is channel coded, channel interleaved, modulated and up-converted.

5. The method according to any one of claims 1 to 4, characterized in that: The shortest frequency switching time corresponding to the frequency converter of the transmitting end is a first duration, the signal duration of the channel detection signal is a second duration, and the second duration is greater than or equal to the first duration.

6. A communication method of a scattering communication system, characterized in that: The method is applied to a receiving end of a scattering communication system, the scattering communication system also includes a transmitting end, the transmitting end and the receiving end are single-antenna devices; the communication frequency bands of the receiving end and the transmitting end are pre-divided into N channels; the method includes: Receiving channel detection signals sent by the transmitting end from the N channels respectively; sorting the channel qualities of the N channels according to the channel detection signal received from each channel; Selecting a channel with the best channel quality as a target channel according to the sorting result, and obtaining a modulation and coding mode corresponding to the target channel according to the channel quality of the target channel; Sending a signaling feedback signal to the transmitting end, wherein the signaling feedback signal includes identification information of the target channel and a modulation and coding mode corresponding to the target channel, so that the transmitting end processes the service data according to the modulation and coding mode corresponding to the target channel to obtain a service communication signal, and sends the service communication signal to the receiving end through the target channel; The sorting of the channel qualities of the N channels according to the channel detection signal received from each channel includes: Acquire a signal-to-noise ratio and / or a bit error rate of each channel according to a channel detection signal received from each channel, and sort the channel qualities of the N channels in descending order according to the signal-to-noise ratio and / or the bit error rate of each channel; Among them, the channel detection signal is composed of a Frank-Zadoff-Chu sequence in a constant envelope zero autocorrelation CAZAC sequence, the symbol rate of the channel detection signal, the signaling feedback signal and the service communication signal are the same, and the shaping method of the channel detection signal, the signaling feedback signal and the service communication signal is the same.

7. The method according to claim 6, characterized in that The receiving channel detection signals sent by the transmitting end from the N channels respectively comprises: The receiving frequency is synchronized to the transmitting frequency by down-conversion, and the channel detection signals sent by the transmitting end are received from the N channels respectively and matched filtering is performed.

8. The method according to claim 6, characterized in that The sending of a signaling feedback signal to the transmitting end comprises: After signaling coding, spectrum spreading, modulation and up-conversion processing are performed on the identification information of the target channel and the modulation and coding mode corresponding to the target channel, a signaling feedback signal is obtained and sent to the transmitting end.

9. The method according to claim 6, characterized in that The time when the transmitting end sends a channel detection signal to the receiving end is a first time, the time when the receiving end sends a signaling feedback signal to the transmitting end is a second time, and the time interval between the second time and the first time is a preset time interval.

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