A method for generating synaesthesia integrated signal and protocol based on multi-carrier comb control multiplexing

Abstract

The present invention provides a method for generating a synaesthesia integrated signal and protocol based on multi-carrier comb control multiplexing. The method is guided by the signal multi-domain control theory, can break through the constraints of radar signal theory, Shannon information theory, Parseval theorem, etc., take into account the contradictory requirements of communication and radar for signals, avoid the deterioration of radar ambiguity function by communication protocol, and realize the integration of large-capacity wireless communication and high-precision radar perception with the same beam (simultaneous same frequency and same airspace). The method is used to design, generate and process synaesthesia integrated signals and protocols, and 0.36% of NR resources can be exchanged for chirp ambiguity function. The method supports commercial terminal access and 5G services, the perception distance is not less than 1km, and the radar communication mutual interference energy is less than ‑39dB. In addition, the entire implementation process of the method is relatively simple, involving only one-dimensional Fourier transform and inverse transform operations, and does not involve complex operations such as inversion and eigendecomposition.

Description

Technical Field

[0001] The present invention belongs to the field of radar technology, and in particular relates to a method for generating a synaesthesia integrated signal and a protocol based on multi-carrier comb control multiplexing. Background Art

[0002] In order to effectively monitor low-altitude drones, it is necessary to deploy a "low, small and slow" radar system. Contradictory to this, with the deepening of global informatization construction, the problem of spectrum scarcity has become increasingly prominent. The increasingly congested electromagnetic environment cannot meet the spectrum needs of a large number of new radars. In view of the large number of communication base stations and the wide low-altitude coverage of communication signals, the inter-sensory integration of low-altitude target detection in the same beam multiplexing communication system is a new path. However, its basic premise is not to significantly reduce communication capacity and not to occupy additional spectrum resources, otherwise it will be difficult to be recognized by operators.

[0003] The core difficulty of interawareness integration is signal integration. The reasons are: (1) High-precision perception requires that the signal self-ambiguity function has low side lobes and no pseudo peaks, while large-capacity wireless communication, due to high-order modulation and pilot, causes the self-ambiguity function to produce high side lobes and pseudo peaks, which are difficult to reconcile; (2) At the same time, the mutual ambiguity function of radar communication signals in the same frequency and airspace cannot be theoretically zeroed, and they are bound to interfere with each other. The industry uses time-division multiplexing signals in the direction of interawareness integration, which has the problem of excessive NR resource consumption. For example, Huawei completed the communication and perception integration verification of time-division multiplexing signals in 2021, and the perception resources accounted for about 15%. The integration of large-capacity wireless communications and high-precision radar perception on the same beam can provide a practical and reliable solution for the future development of low-altitude economy and the guarantee of low-altitude safety and opening without occupying additional spectrum.

[0004] The integration of communication and perception has become one of the core goals of the construction of the next-generation mobile communication network, and will provide underlying capability support for emerging new businesses such as smart industry, smart medical care, intelligent interaction, and smart low-altitude. Summary of the invention

[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a method for generating a synaesthesia integrated signal and protocol based on multi-carrier comb control multiplexing in view of the shortcomings of the prior art, which realizes the integration of large-capacity wireless communication and high-precision radar perception with the same beam.

[0006] The method of the present invention comprises the following steps:

[0007] Step 1: Determine the OFDM multi-carrier modulation mode, bandwidth B, symbol effective time width T, and subcarrier bandwidth according to the 3GPP 5G protocol standard. and cyclic prefix width ; Among them, the total symbol width for , the total number of subcarriers N of the symbol is ;

[0008] Step 2, setting the multi-carrier modulation mode, bandwidth, symbol effective time width, subcarrier bandwidth, cyclic prefix time width, and total number of subcarriers of the symbol of the synaesthesia integrated signal to be consistent with the parameters in step 1;

[0009] Step 3: Set the subcarrier cycle period in the synaesthesia integrated signal And the relative position offset of the chirp subcarrier in the synaesthesia integrated signal subcarrier ,in, ;

[0010] Step 4, generating a radar signal in the synaesthesia integrated signal;

[0011] Step 5, generating a valid symbol for communication in the synaesthesia integrated signal;

[0012] Step 6: Generate a complete symbol of the synaesthesia integrated signal , the complete symbol of the synaesthesia integration signal is called the synaesthesia integration symbol;

[0013] Step 7, repeating steps 4 to 6 to generate two synaesthesia integration symbols. Since the effective communication symbol in step 5 carries the communication information, and the communication information is time-varying, the two synaesthesia integration symbols in step 7 are different;

[0014] Step 8: for the half frame of the 5G protocol, two synaesthesia integration symbols are set as the last symbol of the first time slot and the last symbol of the sixth time slot, respectively, and a standard OFDM communication symbol other than the synaesthesia integration symbol is generated according to the 3GPP protocol;

[0015] Step 9: Repeat steps 4 to 8 for all half frames of the 5G protocol to generate a downlink signal.

[0016] Step 10, when the terminal receives the downlink signal, it demodulates the communication information from the synaesthesia integration symbol and processes the standard OFDM communication symbols other than the synaesthesia integration symbol;

[0017] Step 11: When the base station receives the downlink signal echo, it demodulates the radar information from the synaesthesia integrated symbol.

[0018] In step 4, the radar signal in the synaesthesia integrated signal The time domain form of , the radar signal It consists of I sub-pulses, each of which is a classical linear frequency modulation signal with a constant phase added; the additional phase value of the i-th sub-pulse is Same as in step 3 and Related, j represents the imaginary unit, exp is the natural exponential function;

[0019] The radar signal The classic linear frequency modulation signal in for:

[0020]

[0021] The classic linear frequency modulation signal is recorded as the basic chirp signal, and the time width of the basic chirp signal is for , adjust the frequency for , time is , rectangular envelope for:

[0022] .

[0023] Step 5 includes: channel coding and QAM modulation of the communication bit data to be transmitted, generating communication QAM code elements, using the communication QAM code elements as subcarrier weights of non-chirp subcarriers in the synaesthesia integrated signal; the subcarrier carrying the communication QAM code elements is the communication spectrum, performing fast inverse Fourier transform on the communication spectrum, and generating a valid communication symbol in the synaesthesia integrated signal. Among them, channel coding and QAM modulation of communication bit data are both classic communication modulation methods.

[0024] Step 6 includes: and Add together to generate a valid symbol for the synaesthesia integration signal , and the symbol Add the cyclic prefix to form a complete symbol of the synaesthesia integrated signal Among them, the addition of a cyclic prefix is ​​a classic communication modulation method.

[0025] Step 10 specifically includes the following steps:

[0026] Step 10-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol r end (t);

[0027] Step 10-2, for the valid symbol r end (t) Perform fast Fourier transform to extract radar echo spectrum and communication transmission data according to chirp subcarrier number and communication subcarrier number, respectively, where chirp subcarrier number is , the communication subcarrier number is ;

[0028] Step 10-3, radar signal Considered as a pilot, based on The communication data is estimated and equalized by the extracted radar echo spectrum data. The communication data after channel equalization is processed by the classic communication processing algorithm to obtain the communication transmission information.

[0029] Step 10-4, repeat steps 10-1 to 10-3 to complete the communication processing of all synaesthesia integration symbols.

[0030] Step 10-5, processing standard OFDM communication symbols other than the synaesthesia integration symbols according to the 3GPP protocol.

[0031] Step 11 specifically includes the following steps:

[0032] Step 11-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol ; For the downlink signal received by the terminal and the downlink signal echo received by the base station, the channel responses experienced by the two are different, so the synaesthesia integrated symbols extracted by the terminal and the base station are different; therefore, the effective symbols in step 10-1 and step 11-1 are recorded as different variable formulas;

[0033] Step 11-2, for valid symbols Perform fast Fourier transform and extract radar echo spectrum data according to the chirp subcarrier number, where the chirp subcarrier number is ;

[0034] Step 11-3, the basic chirp signal As a reference, the extracted radar echo spectrum data is pulse compressed to obtain the radar signal after matched filtering. ;

[0035] Step 11-4, repeating steps 11-1 to 11-3, using a classic radar processing algorithm to process the radar data after matched filtering to obtain radar detection information.

[0036] The present invention also provides an electronic device, comprising a processor and a memory, wherein the memory stores program code, and when the program code is executed by the processor, the processor executes the steps of the described method.

[0037] The present invention also provides a storage medium storing a computer program or instruction. When the computer program or instruction is run on a computer, the steps of the method described are executed.

[0038] The present invention has the following beneficial effects: Compared with the prior art, the present invention does not occupy additional frequency bands, occupies very low NR resources, supports commercial terminal access and 5G services, has a sensing distance of not less than 1km, and radar communication mutual interference energy is lower than -39dB. In addition, the implementation process of the present invention is relatively simple, mainly involving fast Fourier transform and inverse transform operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a design and processing flow chart of the present invention.

[0040] Figure 2 It is the radar spectrum and communication spectrum in the synaesthesia integrated symbol of the present invention.

[0041] Figure 3 It is a time domain diagram of the synaesthesia integrated symbol, radar signal and communication signal generated by the present invention.

[0042] Figure 4 It is a schematic diagram of the protocol generation method of the signal of the present invention.

[0043] Figure 5 It is the test scene of the present invention and its abstract diagram.

[0044] Figure 6 4 is a graph showing the relationship between the perception power and the signal-to-noise ratio of the present invention.

[0045] Figure 7 It is the radar ambiguity function implemented by the present invention.

[0046] Figure 8 It is a communication reception constellation diagram implemented by the present invention.

[0047] Fig. 9 It is the radar communication mutual interference energy achieved by the present invention.

[0048] Fig.10 This is a radar perception result diagram implemented by the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become more clear.

[0050] like Figure 1 As shown, the embodiment of the present invention provides a method for generating a synaesthesia integrated signal and a protocol based on multi-carrier comb control multiplexing, comprising the following steps:

[0051] Step 1: Determine the OFDM multi-carrier modulation mode and bandwidth according to the 3GPP 5G protocol standard , Symbol valid time width , subcarrier bandwidth and cyclic prefix width ; Among them, the total symbol width for , the total number of subcarriers in a symbol for ;

[0052] Step 2, setting the multi-carrier modulation mode, bandwidth, symbol effective time width, subcarrier bandwidth, cyclic prefix time width, and total number of subcarriers of the symbol of the synaesthesia integrated signal to be consistent with the parameters in step 1;

[0053] Step 3: Set the subcarrier cycle period in the synaesthesia integrated signal And the relative position offset of the chirp subcarrier in the synaesthesia integrated signal subcarrier ,in, ;

[0054] Step 4, generating a radar signal in the synaesthesia integrated signal;

[0055] Step 5, generating a valid symbol for communication in the synaesthesia integrated signal;

[0056] Step 6: Generate a complete symbol of the synaesthesia integrated signal , the complete symbol of the synaesthesia integration signal is called the synaesthesia integration symbol;

[0057] Step 7, repeat steps 4 to 6 to generate two synaesthesia integration symbols;

[0058] Step 8: For the half frame of the 5G protocol, the two synaesthesia integration symbols are set as the last symbol of the first time slot and the last symbol of the sixth time slot respectively, and other symbols of the 5G protocol are not changed;

[0059] Step 9: Repeat steps 4 to 8 for all half frames of the 5G protocol to generate a downlink signal.

[0060] Step 10, when the terminal receives the downlink signal, it demodulates the communication information from the synaesthesia integration symbol and processes the standard OFDM communication symbols other than the synaesthesia integration symbol;

[0061] Step 11: When the base station receives the downlink signal echo, it demodulates the radar information from the synaesthesia integrated symbol.

[0062] In step 4, the radar signal in the synaesthesia integrated signal The time domain form of , the radar signal It consists of I sub-pulses, each of which is a classical linear frequency modulation signal with a constant phase added; the additional phase value of the i-th sub-pulse is Same as in step 3 and Related, j represents the imaginary unit, exp is the natural exponential function;

[0063] The radar signal The classic linear frequency modulation signal in for:

[0064]

[0065] The classic linear frequency modulation signal is recorded as the basic chirp signal, and the time width of the basic chirp signal is for , adjust the frequency for , time is , rectangular envelope for:

[0066] .

[0067] Step 5 includes: channel coding and QAM modulation of the communication bit data to be transmitted, generating communication QAM code elements, using the communication QAM code elements as subcarrier weights of non-chirp subcarriers in the synaesthesia integrated signal; the subcarrier carrying the communication QAM code elements is the communication spectrum, performing fast inverse Fourier transform on the communication spectrum, and generating a valid communication symbol in the synaesthesia integrated signal. Among them, channel coding and QAM modulation of communication bit data are both classic communication modulation methods.

[0068] Step 6 includes: and Add together to generate a valid symbol for the synaesthesia integration signal , and the symbol Add the cyclic prefix to form a complete symbol of the synaesthesia integrated signal Among them, the addition of a cyclic prefix is ​​a classic communication modulation method.

[0069] Step 10 specifically includes the following steps:

[0070] Step 10-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol r end (t);

[0071] Step 10-2, for the valid symbol r end (t) Perform fast Fourier transform to extract radar echo spectrum and communication transmission data according to chirp subcarrier number and communication subcarrier number, respectively, where chirp subcarrier number is , the communication subcarrier number is ;

[0072] Step 10-3, radar signal Considered as a pilot, based on The communication data is estimated and equalized by the extracted radar echo spectrum data. The communication data after channel equalization is processed by the classic communication processing algorithm to obtain the communication transmission information.

[0073] Step 10-4, repeat steps 10-1 to 10-3 to complete the communication processing of all synaesthesia integration symbols.

[0074] Step 10-5, processing standard OFDM communication symbols other than the synaesthesia integration symbols according to the 3GPP protocol.

[0075] Step 11 specifically includes the following steps:

[0076] Step 11-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol ; For the downlink signal received by the terminal and the downlink signal echo received by the base station, the channel responses experienced by the two are different, so the synaesthesia integrated symbols extracted by the terminal and the base station are different; therefore, the effective symbols in step 10-1 and step 11-1 are recorded as different variable formulas;

[0077] Step 11-2, for valid symbols Perform fast Fourier transform and extract radar echo spectrum data according to the chirp subcarrier number, where the chirp subcarrier number is ;

[0078] Step 11-3, the basic chirp signal As a reference, the extracted radar echo spectrum data is pulse compressed to obtain the radar signal after matched filtering. ;

[0079] Step 11-4, repeating steps 11-1 to 11-3, using a classic radar processing algorithm to process the radar data after matched filtering to obtain radar detection information.

[0080] The present invention also provides an electronic device, comprising a processor and a memory, wherein the memory stores program code, and when the program code is executed by the processor, the processor executes the steps of the described method.

[0081] The present invention also provides a storage medium storing a computer program or instruction. When the computer program or instruction is run on a computer, the steps of the method described are executed.

[0082] In a specific embodiment of the present invention, a method for generating a synaesthesia integrated signal and a protocol based on multi-carrier comb control multiplexing is provided, comprising:

[0083] (1) According to the 3GPP 5G protocol standard, the OFDM multi-carrier modulation mode, bandwidth, symbol effective time width, subcarrier bandwidth and cyclic prefix time width are determined; the specific parameters are shown in Table 1.

[0084] Table 1

[0085] parameter Parameter Value Signal bandwidth / MHz 100 Sampling rate / MHz 122.88 Signal carrier frequency / GHz 3.747 Subcarrier bandwidth / kHz 30 Communication Modulation 16QAM Subcarrier period within an integrated symbol 4 Chirp subcarrier relative offset position 2 Total number of subcarriers in a symbol 4096 Cyclic prefix time / μs 2.34 The number of symbols in a single time slot 14 Time slot ratio 7D:1S:2U

[0086] (2) If the chirp subcarrier occupies the third subcarrier in the subcarrier period and its relative offset position is 2, the radar spectrum and communication spectrum in the synaesthesia integrated symbol are as follows: Figure 2 shown. Figure 3 The synaesthesia integration symbol in the time domain, the radar signal in the synaesthesia integration symbol and the communication signal in the synaesthesia integration symbol. The synaesthesia integration signal protocol generation method based on multi-carrier comb control multiplexing is shown in the figure below. Figure 4 As shown in the figure, since the total number of symbols in the NR half frame is 140, the number of integrated symbols is 2, and the chirp occupies 1 / 4 of the subcarriers in the integrated symbol, the perceived occupied NR resources are 0.36%.

[0087] (3) Synaesthesia integration test scene and its abstract diagram Figure 5 Under typical 5G base station parameters such as 40W transmit power and 4 transmitters and 4 receivers, the 0.1m 2 RCS UAV target, the relationship between the perception power and signal-to-noise ratio of this method is as follows Figure 6 As shown in the figure, with a 15dB signal-to-noise ratio as the constraint, the theoretical maximum detection distance is 1146m.

[0088] (4) Based on Figure 1 Process and Figure 5 The scenario can realize the integration of large-capacity wireless communication and high-precision radar perception with the same beam. In the test results, Figure 7 is the radar ambiguity function, Figure 8 It is a communication reception constellation diagram, where the horizontal axis of the constellation diagram represents the real part, and the vertical axis of the constellation diagram represents the imaginary part. Fig. 9 is the radar communication mutual interference energy, Fig.10 is the radar perception result. Figure 7 It can be seen that the signal inherits the chirp excellent fuzzy function. Under the condition of sharing 100MHz spectrum with communication function, the radar resolution is 1.33m. Figure 8It can be seen that the signal meets the requirements of large-capacity wireless communication. Under the condition of sharing 100MHz spectrum with radar, the data rate and bit error rate of interawareness integrated symbol communication are 344Mbps and 10 -5 This method supports commercial terminal access and 5G services. Fig. 9 It can be seen that the mutual interference energy between radar and communication is less than -39dB. Fig.10 It can be seen that the measured perception distance is better than 1km.

[0089] The present invention provides a method for generating a synaesthesia integrated signal and protocol based on multi-carrier comb control multiplexing. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A method for generating synaesthesia integrated signals based on multi-carrier comb control multiplexing, characterized in that: The following steps are involved: Step 1: Determine the OFDM multi-carrier modulation mode, bandwidth B, symbol effective time width T, subcarrier bandwidth Δf and cyclic prefix time width T according to the 3GPP 5G protocol standard. CP ; Among them, the total symbol width T′ is T+T CP , the total number of subcarriers N of the symbol is BT; Step 2, setting the multi-carrier modulation mode, bandwidth, symbol effective time width, subcarrier bandwidth, cyclic prefix time width, and total number of subcarriers of the symbol of the synaesthesia integrated signal to be consistent with the parameters in step 1; Step 3, setting the subcarrier cycle period I in the synaesthesia integrated signal and the relative position offset L of the chirp subcarrier in the synaesthesia integrated signal subcarrier, where L∈{0,1,2,…,I-1}; Step 4, generating a radar signal in the synaesthesia integrated signal; Step 5, generating a valid symbol for communication in the synaesthesia integrated signal; Step 6: Generate a complete symbol s of the synaesthesia integrated signal joint_total_symbol (t), the complete symbol of the synaesthesia integration signal is called the synaesthesia integration symbol; Step 7, repeat steps 4 to 6 to generate two synaesthesia integration symbols; Step 8: For the half frame of the 5G protocol, the subcarrier bandwidth is set to 30KHz, and the two synaesthesia integration symbols are set to the last symbol of the first time slot and the last symbol of the sixth time slot respectively, and a standard OFDM communication symbol other than the synaesthesia integration symbol is generated according to the 3GPP protocol; Step 9: Repeat steps 4 to 8 for all half frames of the 5G protocol to generate a downlink signal. Step 10, when the terminal receives the downlink signal, it demodulates the communication information from the synaesthesia integration symbol and processes the standard OFDM communication symbols other than the synaesthesia integration symbol; Step 11: When the base station receives the downlink signal echo, it demodulates the radar information from the synaesthesia integrated symbol.

2. The method according to claim 1, characterized in that In step 4, the radar signal s in the synaesthesia integrated signal radar The time domain form of (t) is The radar signal s radar (t) is composed of I sub-pulses, each of which is a classical linear frequency modulation signal with a constant phase added; the additional phase value of the i-th sub-pulse is Related to I and L in step 3, j represents the imaginary unit, and exp is the natural exponential function; The radar signal s radar The classical linear frequency modulation signal s in (t) chirp (t) is: The classic linear frequency modulation signal is recorded as the basic chirp signal, and the time width of the basic chirp signal is T r is T / I, frequency modulation K r B / T r , time is t, rectangular envelope for:

3. The method according to claim 2, characterized in that Step 5 includes: performing channel coding and QAM modulation on the communication bit data to be transmitted, generating communication QAM code elements, and using the communication QAM code elements as subcarrier weights of non-chirp subcarriers in the synaesthesia integrated signal; the subcarrier carrying the communication QAM code elements is the communication spectrum, and performing fast inverse Fourier transform on the communication spectrum to generate a valid communication symbol s in the synaesthesia integrated signal. comm (t).

4. The method according to claim 3, characterized in that Step 6 includes: radar (t) and s comm (t) is added to generate a valid symbol s of the synaesthesia integration signal joint_effect_symbol (t), and the symbol s joint_effect_symbol (t) plus the cyclic prefix to form a complete symbol s of the synaesthesia integrated signal joint_total_symbol (t).

5. The method according to claim 4, characterized in that Step 10 specifically includes the following steps: Step 10-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol r end (t); Step 10-2, for the valid symbol r end (t) Perform fast Fourier transform to extract radar echo spectrum and communication transmission data according to chirp subcarrier number and communication subcarrier number, respectively, where chirp subcarrier number is The communication subcarrier number is Step 10-3, transform the radar signal s radar (t) is regarded as a pilot signal, according to s radar (t) performing channel estimation and equalization on the communication data using the extracted radar echo spectrum data, processing the communication data after channel equalization, and obtaining communication transmission information; Step 10-4, repeating steps 10-1 to 10-3 to complete the communication processing of all synaesthesia integration symbols; Step 10-5, processing standard OFDM communication symbols other than the synaesthesia integration symbols according to the 3GPP protocol.

6. The method according to claim 5, characterized in that Step 11 specifically includes the following steps: Step 11-1, according to the position of the synaesthesia integration symbol in step 8, extract a synaesthesia integration symbol, remove the cyclic prefix, and obtain a valid symbol r bs (t); Step 11-2, for the valid symbol r bs (t) Perform fast Fourier transform and extract radar echo spectrum data according to the chirp subcarrier number, where the chirp subcarrier number is Step 11-3, convert the basic chirp signal s chirp (t) As a reference, the extracted radar echo spectrum data is pulse compressed to obtain the radar signal s after matched filtering radar_MF (t); Step 11-4, repeating steps 11-1 to 11-3, processing the radar data after matched filtering, and obtaining radar detection information.

7. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores program codes, and when the program codes are executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 6.

8. A storage medium, characterized in that: A computer program or instruction is stored, and when the computer program or instruction is run on a computer, the steps of the method according to any one of claims 1 to 6 are executed.

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