Optical communication perception integration method and system based on cyclic prefix shearing enhancement

Abstract

The embodiment of the invention provides an optical communication perception integration method and system based on cyclic prefix shearing enhancement, and relates to the field of communication and signal processing, and the method comprises the steps: in a sending part, carrying out the shearing enhancement processing on an initial signal sequence, adding a cyclic prefix, and carrying out the shearing enhancement processing on the initial signal sequence; and converting the cyclic prefix enhanced signal into an optical signal and sending the optical signal to a receiving device. In the receiving part, the obtained to-be-processed signal sequence is subjected to inverse shearing enhancement processing and correlation operation, an estimated value of symbol offset is determined, and communication information is obtained after cyclic prefix removal and information recovery processing; and time delay is determined according to the estimated value of the symbol offset, so that light-sensing distance measurement and speed measurement are realized. Through the mode of shearing enhancement and cyclic prefix addition, inter-symbol interference and clipping distortion can be effectively eliminated, the bit error rate is reduced, passive time difference estimation sensing can be achieved, extra pilot frequency or sensing signals are not needed, fusion of communication and sensing functions is achieved, and spectrum resources are saved.

Description

Technical Field

[0001] The present invention relates to the field of communications and signal processing, and in particular to an optical communication perception integration method and system based on cyclic prefix clipping enhancement. Background Art

[0002] The rapid development of emerging applications such as smart manufacturing, autonomous driving, and the Internet of Things (IoT) is placing higher demands on wireless transmission systems with high speed, low latency, and strong sensing capabilities. Traditional wireless communication systems, such as radio frequency communication, struggle to meet these application requirements in complex environments with limited bandwidth resources and severe electromagnetic interference.

[0003] In contrast, wireless optical communications, with their advantages of rich bandwidth, high transmission rates, and strong resistance to electromagnetic interference, have become an important supplementary means for short-distance, high-speed data communications. At the same time, optical sensing technology, which uses the reflection and propagation characteristics of light signals to detect target distance and speed, is also gaining momentum, especially in scenarios such as indoor positioning and intelligent driving assistance.

[0004] However, most current wireless optical communication systems and optical sensing systems are still deployed independently, resulting in duplicated equipment, increased costs, wasted spectrum resources, and difficulty in flexible deployment in environments with limited spatial resources. Furthermore, while Orthogonal Frequency-Division Multiplexing (OFDM), a highly spectrally efficient modulation technology, is widely adopted in wireless optical communications, its signals suffer from high peak-to-average power ratios, which can easily cause clipping distortion in practical light sources. Furthermore, it faces challenges with channel interference suppression, impacting communication performance and sensing accuracy. Summary of the Invention

[0005] The present invention provides an integrated optical communication perception method and system based on cyclic prefix clipping enhancement, so as to solve the problems of clipping distortion in the optical communication process, waste of spectrum resources caused by independent optical communication perception, and low optical communication perception accuracy.

[0006] In order to solve the above problems, the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides an integrated optical communication perception method based on cyclic prefix clipping enhancement, the method comprising a sending part and a receiving part, the sending part comprising:

[0008] Step 11: Generate at least one initial signal sequence of length N carrying communication information, where N is a positive integer;

[0009] Step 12: Determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. If there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence, perform shear enhancement processing on the initial signal sequence using the following formula to obtain a value with a length of The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3:

[0010] ,

[0011] in, Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point When 0~N-1 is taken, is the actual signal value, when Pick hour, The value is 0; is a preset peak value used to perform trimming processing on the initial signal sequence; It is expressed as the following formula:

[0012] ;

[0013] Step 13: The length of the rear part of each block sequence is The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = ; The length of the cyclic prefix enhanced signal is ;

[0014] Step 14: Generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device;

[0015] The receiving part includes:

[0016] Step 21: receiving the optical signal from the transmitting device and converting the optical signal to obtain a signal sequence to be processed;

[0017] Step 22: performing inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence;

[0018] Step 23: perform a correlation operation on the reconstructed signal sequence to determine the estimated value of the symbol offset, thereby obtaining an initial restored signal sequence; wherein the length of the initial restored signal sequence is ;

[0019] Step 24: remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence;

[0020] Step 25: Perform information recovery processing on the target recovery signal to obtain communication information;

[0021] Step 26: Determine the delay according to the estimated value of the symbol offset;

[0022] Step 27: Determine the distance and relative speed between the sending device and the receiving device according to the time delay.

[0023] Optionally, the step 11 includes:

[0024] Generate target bit stream information, and map the target bit stream information into a complex-valued symbol sequence according to a preset modulation method; wherein the target bit stream information carries communication information;

[0025] Performing an inverse fast Fourier transform on the complex-valued symbol sequence to obtain parallel time-domain signals;

[0026] Performing parallel-to-serial conversion on the parallel time-domain signals to obtain a serial time-domain signal sequence;

[0027] Power control is performed on the serial time-domain signal sequence to obtain an initial signal sequence.

[0028] Optionally, the length of the cyclic prefix is ​​greater than the maximum delay extension of the channel.

[0029] Optionally, the step 21 includes:

[0030] receiving an optical signal sent by a transmitting device and converting the optical signal into an electrical signal;

[0031] Inputting the electrical signal into an analog-to-digital converter to obtain an initial signal sequence to be processed;

[0032] Inputting the initial signal sequence to be processed into a digital signal processor for modeling processing to obtain a modeled signal sequence;

[0033] According to length The signal sequence after modeling is segmented to obtain a signal sequence to be processed, and then the signal sequence is segmented according to the length. The signal sequence to be processed is segmented to obtain a segmented signal sequence to be processed.

[0034] Optionally, the reconstructed signal sequence is expressed according to the following formula:

[0035] ,

[0036] in, Indicates the sign offset, Indicates that the symbol offset is In the case of , the signal value of the p-th point in the m-th reconstructed signal sequence; Represents the mth sample sequence to be processed; represents the rounding function, represents the remainder of a over b, Represents a symbolic function.

[0037] Optionally, the step 23 includes:

[0038] The estimated value of the symbol offset is determined by performing a correlation operation on the reconstructed signal sequence according to the following formula:

[0039] ,

[0040] in, Indicates that the symbol offset is In the case of , the signal value of the i-th point in the m-th reconstructed signal sequence; is the estimated value of the sign offset, is the length of the sliding window; is the maximum point function;

[0041] An initial recovered signal sequence is determined according to the estimated value of the symbol offset.

[0042] Optionally, the length of the sliding window is .

[0043] Optionally, the step 25 includes:

[0044] Converting the initial recovery signal sequence into parallel initial recovery signals;

[0045] Performing a fast Fourier transform on the parallel initial recovery signals to obtain initial recovery signals in the frequency domain;

[0046] Processing the initial restored signal in the frequency domain using a first-order equalizer to obtain an equalized initial restored signal;

[0047] The equalized initial recovery signal is demodulated according to a preset demodulation method to obtain the communication information.

[0048] Optionally, the sending part further includes: when there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and the signal value of each point in the initial signal sequence is not less than zero, L is equal to 1;

[0049] When there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and there is a point with a signal value less than zero in the initial signal sequence, L is equal to 2.

[0050] In a second aspect, the present invention provides an integrated optical communication perception system based on cyclic prefix clipping enhancement, the system comprising a sending device and a receiving device, the sending device comprising:

[0051] A signal generating module, configured to generate at least one initial signal sequence of length N carrying communication information, where N is a positive integer;

[0052] The shear enhancement module is used to determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. When there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence, the initial signal sequence is sheared and enhanced by the following formula to obtain a value of length The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3:

[0053] ,

[0054] in, Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point When 0~N-1 is taken, is the actual signal value, when Pick hour, The value is 0; is a preset peak value used to perform trimming processing on the initial signal sequence; It is expressed as the following formula:

[0055] ;

[0056] The cyclic prefix adding module is used to add a cyclic prefix to each block sequence. The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = ; The length of the cyclic prefix enhanced signal is ;

[0057] a signal conversion and sending module, configured to generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device;

[0058] The receiving device includes:

[0059] a signal receiving and converting module, configured to receive the optical signal from the transmitting device and convert the optical signal to obtain a signal sequence to be processed;

[0060] A signal reconstruction module, configured to perform inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence;

[0061] A correlation calculation module is used to perform a correlation operation on the reconstructed signal sequence to determine an estimated value of the symbol offset, thereby obtaining an initial restored signal sequence; wherein the length of the initial restored signal sequence is ;

[0062] a cyclic prefix removal module, configured to remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence;

[0063] An information recovery module, configured to perform information recovery processing on the target recovery signal to obtain communication information;

[0064] A delay determination module, configured to determine the delay according to the estimated value of the symbol offset;

[0065] The distance and speed measurement module is used to determine the distance and relative speed between the sending device and the receiving device according to the time delay.

[0066] The optical communication perception integration method based on cyclic prefix clipping enhancement provided by the embodiments of the present invention has the following advantages:

[0067] An embodiment of the present invention provides an integrated method for optical communication perception based on cyclic prefix shearing enhancement. In the sending part, the initial signal sequence carrying communication information is subjected to shearing enhancement processing and a cyclic prefix is ​​added to obtain a cyclic prefix enhanced signal, and then the cyclic prefix enhanced signal is converted into an optical signal and sent to the receiving device. In the receiving part, the signal sequence to be processed obtained after the conversion is subjected to inverse shearing enhancement processing to obtain a reconstructed signal sequence, and then a correlation operation is performed on the reconstructed signal sequence based on the cyclic prefix to determine the estimated value of the symbol offset, thereby obtaining an initial recovered signal sequence, and then after removing the cyclic prefix and performing information recovery processing, the communication information can be obtained to realize the communication function; at the same time, the optical communication delay can be further determined according to the estimated value of the symbol offset, and then the distance and relative speed between the sending device and the receiving device can be determined according to the delay, thereby realizing optical perception ranging and speed measurement.

[0068] In the above approach, adding a cyclic prefix not only effectively eliminates inter-symbol interference caused by channel multipath effects, but also leverages its autocorrelation characteristics to achieve passive time difference of arrival (TDOA) perception. Without the need for additional pilots or sensing signals, this achieves a deep integration of communication and sensing functions, reduces system complexity, and conserves spectrum resources. At the same time, the use of clipping enhancement processing effectively preserves communication information while suppressing clipping distortion caused by peak power limitation, reducing the bit error rate. It also helps improve the accuracy of calculating symbol offsets based on the cyclic prefix, thereby reducing the impact of delay on signal recovery and improving the accuracy of optical sensing ranging and speed measurement, achieving a simultaneous enhancement of optical communication and optical sensing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0070] Figure 1 This is a flowchart of an embodiment of an optical communication perception integration method based on cyclic prefix clipping enhancement according to the present invention;

[0071] Figure 2 A flowchart of another embodiment of an optical communication perception integration method based on cyclic prefix clipping enhancement according to the present invention;

[0072] Figure 3 A flowchart of an inverse shear enhancement process provided by an embodiment of the present invention;

[0073] Figure 4 A structural block diagram of an optical communication perception integrated system based on cyclic prefix clipping enhancement provided by an embodiment of the present invention;

[0074] Figure 5 A comparison chart of simulation results of communication perception of three different systems under specific conditions provided by an embodiment of the present invention;

[0075] Figure 6 This is a diagram showing the combined distance and speed estimation results of a single target obtained by the integrated optical communication and perception system provided by an embodiment of the present invention in a simulation scenario;

[0076] Figure 7 A distribution diagram of single target distance estimation results obtained by the integrated optical communication and perception system provided by an embodiment of the present invention in a simulation scenario;

[0077] Figure 8 This is a distribution diagram of the single target speed estimation results obtained by the optical communication and perception integrated system provided by an embodiment of the present invention in a simulation scenario. DETAILED DESCRIPTION

[0078] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0079] Reference Figure 1 , a flowchart of the steps of an embodiment of an optical communication perception integration method based on cyclic prefix cutting enhancement of the present invention is given, and the method includes a sending part and a receiving part.

[0080] The sending part includes:

[0081] Step 11: Generate at least one initial signal sequence with a length of N and carrying communication information, where N is a positive integer.

[0082] The initial signal sequence is a time-domain signal sequence obtained by orthogonal frequency-division multiplexing (OFDM) modulation. A time-domain signal sequence obtained by OFDM modulation may also be referred to as an OFDM block or an OFDM symbol, which is not limited in the present invention.

[0083] Step 12: Determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. If there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence, perform shear enhancement processing on the initial signal sequence using the following formula to obtain a value with a length of The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3:

[0084]

[0085] Among them, an initial signal sequence of length N corresponds to a length of Enhanced signal sequence.

[0086] In formula (1), Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point When 0~N-1 is taken, is the actual signal value, when Pick hour, The value is 0.

[0087] Accordingly, for In terms of Pick ,Right now When 0~N-1 is taken, is the actual signal value, when When taking other values, The value is 0; for For example, when n is ,Right now When 0~N-1 is taken, is the actual signal value. When n takes other values, The value is 0.

[0088] It is a preset peak value, which is greater than 0 and is determined according to the inherent characteristics of the sending device and is used to trim the initial signal sequence. represents the trimming function, which can be expressed as the following formula:

[0089] . (2)

[0090] The value of a signal can be positive, negative, or 0. The amplitude of a signal refers to the absolute value of the signal. Indicates the absolute value, used to indicate the amplitude of the signal.

[0091] It is understood that during optical communication, the time signal sequence used to convert into an optical signal must be non-negative. Furthermore, due to the inherent characteristics of optical signal transmission devices, the peak power of the light source is limited. Therefore, if the amplitude of the initial signal sequence is too high, clipping distortion can easily occur during communication. To address this issue, the present invention employs clipping enhancement, which uses an additional sequence to transmit the positive and negative value information and trimming information of the initial signal sequence. This effectively suppresses clipping distortion while preserving the information recorded in the signal sequence, thereby improving communication reliability.

[0092] When there is a signal with an amplitude exceeding the preset peak value in the initial signal sequence, formula (1) gives the specific process of shear enhancement:

[0093] Corresponding to the first and second expressions on the right side of formula (1), the positive value portion of the initial signal sequence remains unchanged and is still recorded in the initial signal sequence, that is, the first block sequence; the negative value portion of the initial signal sequence is reversed to a positive value and recorded in the second block sequence of length N. Therefore, the second block sequence is used to record the negative signal points in the initial signal sequence. For example, the initial signal sequence is [-2, 1, -6, 0, 5]. After only the negative value portion is reversed, the corresponding sequences obtained are [0, 1, 0, 0, 5] and [2, 0, 6, 0, 0]. The positions of -2 and -6 in the initial signal sequence are 0th and 2nd, respectively. Correspondingly, the reversed values ​​2 and 6 are also 0th and 2nd in the second block sequence. At the same time, the signal values ​​of the 0th and 2nd positions in the first block sequence are recorded as 0. Of course, when the signal values ​​of the points in the initial signal sequence are not less than 0, the signal values ​​of each point in the second block sequence can be recorded as 0.

[0094] Corresponding to the third expression on the right side of formula (1), the initial signal sequence is clipped and the clipping information is recorded in the third signal sequence of length N, that is, the third block sequence to reduce distortion. If the clipped signal value is still higher than the preset peak value, the clipping is continued and recorded in the next signal sequence of length N until the signal values ​​at the midpoints of all block sequences are no greater than the peak value. For example, if the initial signal sequence is [1,4,7,3,6] and the preset peak value is 3, then the enhanced signal sequence corresponding to the initial signal sequence includes the following four block sequences: [1,3,3,3,3], [0,0,0,0,0], [0,1,3,0,3], [0,0,1,0,0], where the signal value at the second position in the initial signal sequence is 7, which exceeds the preset peak value and needs to be clipped twice. The clipped information is recorded in the second position of the third and fourth block sequences.

[0095] In order to further fully illustrate the shear enhancement process described in formula (1), the present invention provides the following example for the case where there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence of length N, and there is a signal value less than 0 in the initial signal sequence:

[0096] Assuming that the initial signal sequence is [-6, 4, 7, -3, -1, 2] and the preset peak value is 3, the four block sequences included in the enhanced signal sequence corresponding to the initial signal sequence are: [0, 3, 3, 0, 0, 2], [3, 0, 0, 3, 1, 0], [3, 1, 3, 0, 0, 0], and [0, 0, 1, 0, 0, 0]. The first block sequence records signal points with positive signal values, and the second block sequence records signal points with negative signal values. However, since the amplitude of some signals in the initial signal sequence exceeds the peak value, clipping is required. Among them, since the signal value of the 0th bit in the initial signal sequence is negative and the amplitude exceeds the peak value, it is necessary not only to record the signal value of 3 at the 0th bit in the second block sequence, but also to record the signal value of 3 at the 0th bit in the third block sequence. In other words, the sum of the signal values ​​of the 0th bit in the second and third block sequences is the signal amplitude of the 0th bit in the initial signal sequence.

[0097] Therefore, the enhanced signal sequence obtained through clipping enhancement not only retains the amplitude, positive and negative information, and signal point information of the initial signal sequence, but also effectively suppresses clipping distortion caused by peak power limitation, reducing the bit error rate. Furthermore, the enhanced signal sequence comprising multiple block sequences obtained through clipping enhancement helps improve the accuracy of symbol offset calculation based on the cyclic prefix at the receiving device, thereby reducing the impact of delay on signal recovery and improving the accuracy of optical sensing ranging and speed measurement, achieving simultaneous enhancement of optical communication and optical sensing.

[0098] Step 13: The length of the rear part of each block sequence is The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = ; The length of the cyclic prefix enhanced signal is .

[0099] In order to eliminate the inter-symbol interference (ISI) caused by the channel multipath effect, the length of the rear of each block sequence is The signal is used as a cyclic prefix and added to the front end of the block sequence to obtain a cyclic prefix enhanced signal. The block sequence after adding the cyclic prefix can be expressed as follows:

[0100] , (3)

[0101] in, Indicates the signal value of the nth point in a block sequence after adding a cyclic prefix, Indicates the signal value of the nth point in the block sequence before adding the cyclic prefix. N represents the length of the block sequence before adding the cyclic prefix, which is equal to the length of the initial signal sequence. represents the length of the block sequence after adding the cyclic prefix. Accordingly, the length of the cyclic prefix enhanced signal composed of L block sequences is ,Right now .

[0102] As an example, assume the block sequence is [5,2,3,6,1], =2, then the block sequence after adding the cyclic prefix is ​​[6,1,5,2,3,6,1].

[0103] Moreover, adding a cyclic prefix to the block sequence is equivalent to creating a periodic extension in the series. This periodicity exhibits autocorrelation characteristics when performing correlation calculations at the receiving end. Therefore, when performing signal recovery on the receiving device side, the autocorrelation of the cyclic prefix can be used to determine the symbol offset caused by the delay. Specifically, when performing correlation calculations on the signal, the correlation value between the cyclic prefix part at the front end of the sequence and the same part at the back end of the sequence will reach a peak, while the correlation between the non-cyclic prefix parts of the sequence is relatively weak, with a low correlation value or even close to 0. Based on this correlation difference, by calculating the correlation value of the sequence under different symbol offsets, the symbol offset can be determined, and then the delay can be determined, so that the distance and speed measurement operations between the transmitting device and the receiving device can be performed based on the delay.

[0104] Therefore, by adding a cyclic prefix, not only can the inter-symbol interference caused by the channel multipath effect be effectively eliminated, but its autocorrelation characteristics can also be utilized to realize passive time difference estimation (TDOA) perception. That is, without the need for additional pilot or perception signals, optical perception ranging and speed measurement can be realized, thereby achieving a deep integration of communication and perception functions, reducing system complexity and saving spectrum resources.

[0105] In addition, it can be understood that no matter whether step 12 is executed first and then step 13 or step 13 is executed first and then step 12, the same cyclic prefix signal can be obtained. Therefore, the numbers of step 12 and step 13 are only used to distinguish different processing processes and should not be a limitation on the execution order of the processing processes.

[0106] Optionally, the length of the cyclic prefix is ​​greater than the maximum delay extension of the channel.

[0107] The maximum channel delay spread refers to the maximum difference in time delay caused by different paths or dispersion effects when a signal propagates in the channel, and can be determined based on the signal propagation environment. In this embodiment of the present invention, the length of the cyclic prefix is ​​greater than the maximum channel delay spread, which helps to suppress multipath interference.

[0108] Step 14: Generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device.

[0109] Specifically, a digital-to-analog converter is used to convert the cyclic prefix enhancement signal into a current signal, and then the current signal is used to drive a light source to generate an optical signal and send it to a receiving device.

[0110] The receiving part includes:

[0111] Step 21: Receive the optical signal from the transmitting device and convert the optical signal to obtain a signal sequence to be processed.

[0112] Among them, a photoelectric detector is set on one side of the receiving device to receive the optical signal sent by the sending device; after the optical signal is converted, a signal sequence to be processed carrying communication information is obtained.

[0113] Step 22: Perform inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence.

[0114] The inverse shear enhancement process is the inverse process of the shear enhancement process described in step 12. As can be seen from step 12, the amplitude of each signal point in the initial signal sequence is the sum of the amplitudes of the corresponding signal points in each block sequence, and the positive or negative sign of the signal value of each point can be determined based on whether the signal point has an amplitude at the corresponding position in the second block sequence. Therefore, in the process of inverse shear enhancement, the signal amplitude of each point in the reconstructed signal can be obtained by first summing the signal values ​​of the same points in each block sequence to be processed, and then the positive or negative sign of the signal value can be determined.

[0115] As an example, assume that three block-to-be-processed signal sequences constitute a signal sequence to be processed: [2, 0, 3, 2, 0], [0, 3, 0, 0, 3], and [0, 3, 2, 0, 3]. The preset peak value is 3. Then, the corresponding reconstructed signal amplitude sequence is [2, 6, 5, 2, 6]. Then, the sign of the signal value at each point is determined to obtain the reconstructed signal sequence [2, -6, 5, 2, -6]. The positive and negative values ​​can be determined by directly reading or by taking the difference between the first block-to-be-processed sequence and the second block-to-be-processed sequence and then using a sign function to determine the positive and negative values. This is not limited in the present invention.

[0116] However, in actual situations, the transmission of optical communication channels will cause signal gain and delay, which will cause the signal sequence to be processed obtained by the receiving device to have a sign offset. In the case of no sign offset, an initial signal sequence carrying communication information corresponds to a length of In the case of symbol offset, an initial signal sequence carrying communication information may correspond to a signal sequence to be processed plus another signal sequence with a length less than The sequence of signals to be processed.

[0117] The above symbol offset will make it impossible to determine the starting point of the real signal sequence, and thus make it impossible to obtain effective communication information. Therefore, in order to improve the accuracy of the recovered signal, during the reverse shearing enhancement process described in step 22, the lengths corresponding to different symbol offsets will be calculated as The reconstructed signal sequence is used to estimate the symbol offset in step 23 and then restore the signal.

[0118] Step 23: perform a correlation operation on the reconstructed signal sequence to determine the estimated value of the symbol offset, thereby obtaining an initial restored signal sequence; wherein the length of the initial restored signal sequence is .

[0119] When calculating signal correlation, the correlation between the cyclic prefix portion at the beginning of the sequence and the same portion at the end reaches a peak, while the correlation between the non-cyclic prefix portion of the sequence is relatively weak, with values ​​low or even close to zero. Based on this correlation difference, by calculating the correlation values ​​of the sequence under different symbol offsets, the symbol offset estimate can be determined, and then the initial recovered signal sequence, which includes the cyclic prefix and the initial signal sequence, can be determined.

[0120] Specifically, the correlation values ​​of different reconstructed signal sequences can be calculated separately, and the symbol offset corresponding to the reconstructed signal sequence with the largest correlation value can be determined as the estimated value; or the different reconstructed signal sequences can be aggregated into one signal sequence, and correlation operations can be performed on different symbol offsets through a sliding window, and the symbol offset corresponding to the value with the largest correlation value can be determined as the estimated value.

[0121] As an example, the estimated value of the symbol offset can be obtained according to the following formula:

[0122] , (4)

[0123] Where ε represents the sign offset, is the estimated value of the symbol offset; is the maximum point function, It indicates that correlation operation is performed on the reconstructed signal sequences corresponding to different symbol offsets.

[0124] Therefore, by utilizing the characteristics of cyclic prefix autocorrelation, accurate estimation of symbol offset can be achieved during signal recovery, effectively reducing the impact of delay on communication and improving communication reliability.

[0125] Step 24: Remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence.

[0126] It is understandable that the target recovery signal obtained by the receiving device in step 24 corresponds to the initial signal sequence of the sending device in step 11, so the purpose of step 24 is to restore the initial signal sequence. Specifically, the initial recovery signal sequence consists of a length of The cyclic prefix and the effective signal part of length N are composed of the cyclic prefix and the effective signal part of length N. The cyclic prefix removal refers to removing the initial recovery signal sequence. The target signal is recovered by combining the signal points of lengths. This process helps eliminate the interference introduced by the multipath effect and ensures the integrity of the signal.

[0127] Step 25: Perform information recovery processing on the target recovery signal to obtain communication information.

[0128] Performing information recovery processing on the target recovery signal refers to extracting communication information from the target recovery signal, which is the inverse process of step 11. Specific processing methods include but are not limited to fast Fourier transform, serial-to-parallel conversion, demodulation, etc.

[0129] Step 26: Determine the delay according to the estimated value of the symbol offset.

[0130] In the embodiment of the present invention, the initial signal sequence is obtained based on OFDM technology, and OFDM is obtained by dividing the preset bandwidth into The OFDM symbol is divided into multiple orthogonal subcarriers to realize data transmission. Correspondingly, the sampling interval of the OFDM symbol, that is, the initial signal sequence, is 1 / B, that is, the sampling interval of the reconstructed signal is also 1 / B. When the symbol offset is determined, the delay can be expressed as follows:

[0131] , (5)

[0132] in, Indicates delay, represents the estimated value of the symbol offset obtained in step 23.

[0133] Step 27: Determine the distance and relative speed between the sending device and the receiving device according to the time delay.

[0134] When the time delay is determined, the distance between the transmitting device and the receiving device can be expressed according to the following formula:

[0135] , (6)

[0136] Here, c represents the speed of light.

[0137] Repeat step 26 twice to measure the receiver speed. Specifically, the estimated value of the symbol offset for the first measurement is , the distance measured by the time delay corresponding to the symbol offset is . Elapsed time After that, the second symbol shift estimate is The measured distance is .

[0138] Then the relative speed between the sending device and the receiving device It can be expressed as follows:

[0139] . (7)

[0140] Therefore, by adding a cyclic prefix to the signal sequence and using the characteristics of the cyclic prefix autocorrelation to calculate the estimated value of the symbol offset, passive time difference estimation and perception can be achieved without the need for additional pilot or perception signals, thereby realizing optical perception, ranging and speed measurement, achieving a deep integration of optical communication and perception functions, reducing system complexity and saving spectrum resources.

[0141] In summary, an embodiment of the present invention provides an integrated method for optical communication perception based on cyclic prefix shearing enhancement. In the sending part, the initial signal sequence carrying the communication information is subjected to shearing enhancement processing and cyclic prefix addition, so as to obtain a cyclic prefix enhanced signal, and then the cyclic prefix enhanced signal is converted into an optical signal and sent to the receiving device. In the receiving part, the signal sequence to be processed obtained after the conversion is subjected to inverse shearing enhancement processing to obtain a reconstructed signal sequence, and then the reconstructed signal sequence is subjected to correlation operation based on the cyclic prefix to determine the estimated value of the symbol offset, thereby obtaining the initial recovered signal sequence, and then after removing the cyclic prefix and performing information recovery processing, the communication information can be obtained, thereby realizing the communication function; at the same time, the optical communication delay can be further determined according to the estimated value of the symbol offset, and then the distance and relative speed between the sending device and the receiving device can be determined according to the delay, thereby realizing optical perception ranging and speed measurement.

[0142] In the above approach, adding a cyclic prefix not only effectively eliminates inter-symbol interference caused by channel multipath effects, but also leverages its autocorrelation characteristics to achieve passive time difference of arrival (TDOA) perception. Without the need for additional pilots or sensing signals, this achieves a deep integration of communication and sensing functions, reduces system complexity, and conserves spectrum resources. At the same time, the use of clipping enhancement processing effectively preserves communication information while suppressing clipping distortion caused by peak power limitation, reducing the bit error rate. It also helps improve the accuracy of calculating symbol offsets based on the cyclic prefix, thereby reducing the impact of delay on signal recovery and improving the accuracy of optical sensing ranging and speed measurement, achieving a simultaneous enhancement of optical communication and optical sensing effects.

[0143] Optionally, the step 11 includes:

[0144] Step 111: Generate target bit stream information, and map the target bit stream information into a complex-valued symbol sequence according to a preset modulation method; wherein the target bit stream information carries communication information;

[0145] Step 112: performing an inverse fast Fourier transform on the complex-valued symbol sequence to obtain parallel time-domain signals;

[0146] Step 113: performing parallel-to-serial conversion on the parallel time domain signals to obtain a serial time domain signal sequence;

[0147] Step 114: Perform power control on the serial time-domain signal sequence to obtain an initial signal sequence.

[0148] Among them, by introducing the power factor to control the signal, it is possible to control the signal attack and the degree of clipping distortion through power scaling, and also to amplify the signal power when the signal amplitude is too small to reduce the impact of noise and interference signals.

[0149] Figure 2 A flowchart of the steps of another embodiment of the optical communication perception integration method based on cyclic prefix cutting enhancement of the present invention is given, and the formulas and symbols included therein are consistent with the formulas and symbols in the embodiment of the present invention. Figure 2 The flowchart includes a step flow chart of the method embodiment of steps 111 to 114.

[0150] Corresponding to step 111, the information source generates a bit stream carrying communication information, and maps the bit stream into a complex symbol sequence according to the M-QAM mapping method [ ]. Where N is the number of subcarriers, which is also the length of the initial signal sequence, and the complex-valued symbol sequence must satisfy Hermitian symmetry to ensure that the parallel time-domain signals output by the inverse fast Fourier transform are real-valued.

[0151] Corresponding to step 114, by introducing the power factor Power control is performed to obtain an initial signal sequence.

[0152] Optionally, the step 21 includes:

[0153] Step 211: Receive an optical signal sent by a transmitting device and convert the optical signal into an electrical signal;

[0154] Step 212: input the electrical signal into an analog-to-digital converter to obtain an initial signal sequence to be processed;

[0155] Step 213: input the initial signal sequence to be processed into a digital signal processor for modeling processing to obtain a modeled signal sequence;

[0156] Step 214: According to the length The signal sequence after modeling is segmented to obtain a signal sequence to be processed, and then the signal sequence is segmented according to the length. The signal sequence to be processed is segmented to obtain a segmented signal sequence to be processed.

[0157] Regarding step 211 , the receiving device is provided with a photodetector (PD) for receiving the incident light signal sent by the sending device and converting the incident light signal into an electrical signal.

[0158] Regarding step 213, the initial signal sequence to be processed is input into a digital signal processor (DSP) and modeled according to a preset model to obtain a modeled signal sequence. .

[0159] As an example, the initial signal sequence to be processed can be modeled according to the following formula:

[0160] y s =ρ∙ h s * x ̃ s + w y [s] , (8)

[0161] in, Represents the signal value of the sth point in the modeled signal sequence, Represents the signal value of the sth point in the initial signal sequence to be processed; Represents the unit impulse response of the preset model, represents the responsivity of the photodetector, w y [ s ] Represents additive noise. It should be noted that, in the embodiment of the present invention, “ ” is only used in formula (8) and is represented as the convolution operator. ” are all multiplication operators.

[0162] Regarding step 214, you can use y m [l,p] represents the signal value of the p-th point in the l-th block of the m-th sequence to be processed, where p ranges from 0 to N-1, and l ranges from 0 to L-1. m, l, and p can be obtained according to the following formulas:

[0163] , (9)

[0164] , (10)

[0165] , (11)

[0166] Wherein, s is the same as that in step 213. The s in has the same meaning, indicating the sth signal point in the modeled signal sequence; represents the rounding function, It represents the remainder of a over b.

[0167] Optionally, based on the contents of steps 211 to 214, the reconstructed signal sequence in step 22 may be expressed according to the following formula:

[0168] , (12)

[0169] in, Indicates the sign offset, Indicates that the symbol offset is In the case of , the signal value of the p-th point in the m-th reconstructed signal sequence; Represents the mth sample sequence to be processed; represents the rounding function, represents the remainder of a over b, represents a symbolic function. For example, Indicates the mth sample sequence to be processed The first block in the sequence The value of a signal point.

[0170] Reference Figure 2 middle to The flowchart of the steps describes the process of inverse shear enhancement using the method described in formula (12), that is, Figure 2 Zhongyou to The reverse process of the shear enhancement process.

[0171] It is worth noting that in the signal transmission part, the embodiment of the present invention first performs the initial signal sequence Enhanced signal sequence was obtained by splicing enhancement , and then enhance the signal sequence Add a cyclic prefix (CP) to obtain a cyclic prefix enhanced signal sequence In the receiving part, inverse clipping and enhancement are performed before cyclic prefix removal. This is because the cyclic prefix must be retained for symbol offset estimation. Performing inverse clipping and enhancement first can effectively reduce the computational complexity during signal recovery, improving communication efficiency, compared to estimating the symbol offset first.

[0172] In addition, although Figure 2 Simplified the Segment processing to obtain y m [ l ,p] However, this process is very important for the inverse shear enhancement process. Using segmented processing to obtain the signal sequence to be processed can effectively simplify the processing process and improve the interpretability of the inverse shear enhancement process.

[0173] Figure 3 Taking a signal sequence of length 18 as an example, a flowchart of an inverse shear enhancement process provided by an embodiment of the present invention is given. The segmentation process is performed, that is, , L=3, one of the sequences to be processed includes 3 The block sequence to be processed, the other sequence to be processed includes 1 The block sequence to be processed. y m [ l ,p] represents the lth block sequence to be processed in the mth block sequence to be processed, and p represents the position of the signal point in the block sequence to be processed, for example y 0 [1, p ] 、 y 0 [2, p ] 、 y 1 [0, p ] ; It represents the signal value of the p-th point in the l-th block of a certain signal sequence to be processed, for example 、 wait; As shown in formula (12), it means that when the symbol offset is In the case of , the mth reconstructed signal sequence, p represents the position of the signal point in the reconstructed signal sequence, for example 、 etc.; [p, ] means that the symbol offset is In the case of , the signal value of the pth point in the reconstructed signal sequence is reconstructed. Boxes of different colors are used to identify the processing process of reconstructing the signal sequence corresponding to different symbol offsets.

[0174] It is understandable that to calculate a length of The reconstructed signal sequence needs to be based on a length of Therefore, to calculate the reconstructed signal sequence when the symbol offset is 0, it is necessary to calculate the 0th to 14th signals, that is, ~ Divide these 15 signals into three block sequences in sequence, and then process them according to the method described in formula (12), and you can get the reconstructed signal sequence when the symbol offset is 0. Take [0, 0] as an example, , which determines the positive or negative value of the signal by taking the difference between the signal values ​​of the corresponding points in the first block sequence and the second block sequence.

[0175] Optionally, based on the reconstructed signal sequence obtained by formula (12), step 23 includes:

[0176] Step 231: Determine an estimated value of the symbol offset by performing a correlation operation on the reconstructed signal sequence according to the following formula:

[0177] , (13)

[0178] in, Indicates that the symbol offset is In the case of , the signal value of the i-th point in the m-th reconstructed signal sequence; is the estimated value of the sign offset, is the length of the sliding window; is the maximum point function;

[0179] Step 232: Determine an initial recovered signal sequence according to the estimated value of the symbol offset.

[0180] As an example, assume that the reconstructed signal sequences obtained when the symbol offsets are 0, 1, and 2 are [2, 0, 3, 2, 1], [0, 3, 2, 1, 3], and [3, 2, 1, 3, 2], respectively, N=3, and the length of the sliding window is 2. A correlation operation is performed on each reconstructed signal sequence, and the result corresponding to the 0th reconstructed signal sequence is , the result corresponding to the first reconstructed signal sequence , the result corresponding to the second reconstructed signal sequence Therefore, the correlation value of the reconstructed signal sequence is the highest when the offset is 2, and the estimated symbol offset is determined to be 2. Accordingly, the second reconstructed signal sequence can be determined to be the initial recovered signal sequence. At the same time, the signal values ​​of the first two digits and the signal values ​​of the last two digits in the second reconstructed signal sequence [3,2,1,3,2] are the same, meeting the cyclic prefix requirements, indicating that the estimated symbol offset is correct.

[0181] like Figure 2As shown in the perception part, the initial recovery signal sequence can be determined based on the estimated value of the returned symbol offset, which is helpful for the realization of communication function; at the same time, the time delay can be further determined based on the estimated value of the symbol offset to realize optical perception speed and distance measurement, which realizes the integration of optical communication perception function.

[0182] Therefore, utilizing the autocorrelation of the cyclic prefix helps to realize passive time difference estimation perception in the optical communication perception process. Without the need for additional pilot or perception signals, it can achieve deep integration of communication and perception functions and save spectrum resources.

[0183] Optionally, the length of the sliding window in formula (13) is .

[0184] Selecting the length of the cyclic prefix as the length of the sliding window helps to fully utilize the correlation of the cyclic prefix and improve the accuracy of symbol offset estimation.

[0185] Optionally, the step 25 includes:

[0186] Step 251: Convert the initial recovery signal sequence into parallel initial recovery signals;

[0187] Step 252: Perform fast Fourier transform on the parallel initial restored signals to obtain initial restored signals in the frequency domain;

[0188] Step 253: Process the initial restored signal in the frequency domain using a first-order equalizer to obtain an equalized initial restored signal;

[0189] Step 254: demodulate the equalized initial recovery signal according to a preset demodulation method to obtain the communication information.

[0190] As an example, Figure 2 A flowchart of the method embodiment of step 24 and step 251-step 254 is also provided.

[0191] Regarding steps 24 and 251, after removing the cyclic prefix to obtain the initial recovered signal sequence, before performing the serial-to-parallel conversion, corresponding processing must be performed based on whether the receiving part has performed power control: if a power factor is introduced in the receiving part for power control, corresponding inverse processing is required; if not, no inverse processing of power control is required.

[0192] Regarding step 253, the main function of the first-order equalizer is to compensate for signal distortion caused by multipath propagation, thereby improving signal quality. By equalizing the restored time domain signal, inter-symbol interference can be effectively reduced, and the clarity and reliability of the received signal can be improved.

[0193] Regarding step 254, M-QAM demodulation is performed on the equalized initial recovered signal. Through demodulation, the receiving end can accurately recover the transmitted bit stream information, and the information source receives the bit stream information and then obtains the communication information, thereby achieving a communication effect.

[0194] Optionally, the sending part further includes: when there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and the signal values ​​of the midpoints of the initial signal sequence are not less than zero, L is equal to 1;

[0195] When there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and there is a point with a signal value less than zero in the initial signal sequence, L is equal to 2.

[0196] When L=1 or 2, the communication strategy can be adjusted according to the actual situation. For example, when the environmental interference is small, the initial signal sequence can be sent directly; when the environmental interference is strong, the signal amplitude can be amplified through power control, and then the signal can be sent after the processing such as clipping enhancement and adding cyclic prefix described in the above steps to reduce the interference of environmental interference on the effective information in the signal.

[0197] Figure 4 A structural block diagram of an integrated optical communication perception system based on cyclic prefix clipping enhancement provided by an embodiment of the present invention is provided. The system 300 includes a sending device 310 and a receiving device 320, wherein the sending device includes:

[0198] The signal generating module 311 is configured to generate at least one initial signal sequence of length N carrying communication information, where N is a positive integer;

[0199] The shear enhancement module 312 is used to determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. When there is a signal with an amplitude exceeding the preset peak value in the initial signal sequence, the initial signal sequence is shear enhanced using the following formula to obtain a value of length The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3:

[0200] ,

[0201] in, Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point When 0~N-1 is taken, is the actual signal value, when Pick hour, The value is 0; is a preset peak value used to perform trimming processing on the initial signal sequence; It is expressed as the following formula:

[0202] ;

[0203] The cyclic prefix adding module 313 is used to add the length of each block sequence to the The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = ; The length of the cyclic prefix enhanced signal is ;

[0204] a signal conversion and sending module 314, configured to generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device;

[0205] The receiving device includes:

[0206] The signal receiving and converting module 321 is configured to receive the optical signal from the transmitting device and convert the optical signal to obtain a signal sequence to be processed;

[0207] A signal reconstruction module 322 is configured to perform inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence;

[0208] The correlation calculation module 323 is used to perform a correlation operation on the reconstructed signal sequence to determine the estimated value of the symbol offset, and then obtain the initial restored signal sequence; wherein the length of the initial restored signal sequence is ;

[0209] a cyclic prefix removal module 324, configured to remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence;

[0210] An information recovery module 325 is configured to perform information recovery processing on the target recovery signal to obtain communication information;

[0211] A delay determination module 326, configured to determine a delay based on the estimated value of the symbol offset;

[0212] The distance and speed measurement module 327 is configured to determine the distance and relative speed between the sending device and the receiving device according to the time delay.

[0213] To illustrate the technical effects of the above-mentioned optical communication perception integrated method and system based on cyclic prefix clipping enhancement, the embodiment of the present invention provides the following simulation parameters and data results:

[0214] Table 1 Simulation parameters

[0215]

[0216] Figure 5 A comparative chart shows the communication perception simulation results of three different systems under specific conditions provided by embodiments of the present invention. These systems are: an asymmetrically clipped optical (ACO) OFDM system, a DC biased optical (DCO) OFDM system, and a Clipping Enhanced Optical-Orthogonal Frequency Division Multiplexing (CEO-OFDM) system provided by embodiments of the present invention. All three systems communicate by adding a cyclic prefix. Indicates the power index, which is used to control the signal power.

[0217] Figure 5 Specifically, it is shown in different The changing trends of the bit error rate (BER) and passive time difference of arrival (TDOA) perception error of DCO-OFDM, ACO-OFDM and CEO-OFDM systems under different values ​​of . The performance of the three systems in communication and perception is analyzed through simulation. The results show that as Increase, BER first decreases and then increases, the reason is that the initial power increase can improve the signal to noise ratio, while too large The introduction of clipping noise will cause the bit error rate to increase. This is due to the improved correlation brought about by the enhanced signal power. Regardless of BER or TDOA, the CEO-OFDM system provided by the present invention always shows the best perception accuracy.

[0218] Figure 6 The figure shows the joint estimation result of the distance and speed of a single target obtained by the optical communication perception integrated system provided by the embodiment of the present invention in a simulation scenario. Figure 7 A distribution diagram of the single target distance estimation results obtained by the optical communication perception integrated system provided by an embodiment of the present invention in a simulation scenario is given. Figure 8 The distribution diagram of the single target speed estimation results obtained by the optical communication perception integrated system provided by the embodiment of the present invention in the simulation scenario is given. In other words, in the simulation scenario of the CEO-OFDM system, Figure 6-Figure 8 This constitutes the joint estimation result graph of the distance and speed of a single target.

[0219] Figure 6 In the figure, the blue triangle represents the estimation result of CEO-OFDM, the red ellipse is the three-sigma range, which is used to mark the confidence boundary of the estimation error; the blue dot represents the actual distance and speed. Figure 7 and Figure 8 The marginal distribution of the distance and speed estimation results is shown in Figure 2, which shows the concentration of the estimation results in two dimensions. The results show that the CEO-OFDM system can achieve high-precision estimation of target distance and speed under these simulation conditions, and the errors are concentrated near the target, verifying the effectiveness and robustness of the proposed method in joint perception scenarios.

[0220] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referenced. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0221] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An integrated optical communication perception method based on cyclic prefix clipping enhancement, characterized in that: The method includes a sending part and a receiving part; the sending part includes: Step 11: Generate at least one initial signal sequence of length N carrying communication information, where N is a positive integer; Step 12: Determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. If there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence, perform shear enhancement processing on the initial signal sequence using the following formula to obtain a value with a length of The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3: ， in, Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point Pick hour, is the actual signal value, when Pick hour, The value is 0; is the preset peak value; It is expressed as the following formula: ； Step 13: The length of the rear part of each block sequence is The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = ; The length of the cyclic prefix enhanced signal is ; Step 14: Generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device; The receiving part includes: Step 21: receiving the optical signal from the transmitting device and converting the optical signal to obtain a signal sequence to be processed; Step 22: performing inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence; Step 23: perform a correlation operation on the reconstructed signal sequence to determine the estimated value of the symbol offset, thereby obtaining an initial restored signal sequence; wherein the length of the initial restored signal sequence is ; Step 24: remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence; Step 25: Perform information recovery processing on the target recovery signal to obtain communication information; Step 26: Determine the delay according to the estimated value of the symbol offset; Step 27: Determine the distance and relative speed between the sending device and the receiving device according to the time delay.

2. The optical communication sensing integrated method according to claim 1, characterized in that: The step 11 includes: Generate target bit stream information, and map the target bit stream information into a complex-valued symbol sequence according to a preset modulation method; wherein the target bit stream information carries communication information; Performing an inverse fast Fourier transform on the complex-valued symbol sequence to obtain parallel time-domain signals; Performing parallel-to-serial conversion on the parallel time-domain signals to obtain a serial time-domain signal sequence; Power control is performed on the serial time-domain signal sequence to obtain an initial signal sequence.

3. The optical communication sensing integrated method according to claim 1, characterized in that: The length of the cyclic prefix is ​​greater than the maximum delay spread of the channel.

4. The optical communication sensing integrated method according to claim 1, characterized in that: The step 21 includes: receiving an optical signal sent by a transmitting device and converting the optical signal into an electrical signal; Inputting the electrical signal into an analog-to-digital converter to obtain an initial signal sequence to be processed; Inputting the initial signal sequence to be processed into a digital signal processor for modeling processing to obtain a modeled signal sequence; According to length The signal sequence after modeling is segmented to obtain a signal sequence to be processed, and then the signal sequence is segmented according to the length. The signal sequence to be processed is segmented to obtain a segmented signal sequence to be processed.

5. The optical communication sensing integrated method according to claim 4, characterized in that: The reconstructed signal sequence is expressed according to the following formula: ， in, Indicates the sign offset, Indicates that the symbol offset is In the case of The first The signal value of each point; Indicates the A sequence of samples to be processed; represents the rounding function, express right The remainder of Represents a symbolic function.

6. The optical communication sensing integrated method according to claim 5, characterized in that: The step 23 includes: The estimated value of the symbol offset is determined by performing a correlation operation on the reconstructed signal sequence according to the following formula: ， in, Indicates that the symbol offset is In the case of The first The signal value of each point; is the estimated value of the sign offset, is the length of the sliding window; is the maximum point function; An initial recovered signal sequence is determined according to the estimated value of the symbol offset.

7. The optical communication sensing integrated method according to claim 6, characterized in that: The length of the sliding window is .

8. The optical communication sensing integrated method according to claim 1, characterized in that: The step 25 includes: Converting the initial recovery signal sequence into parallel initial recovery signals; Performing a fast Fourier transform on the parallel initial recovery signals to obtain initial recovery signals in the frequency domain; Processing the initial restored signal in the frequency domain using a first-order equalizer to obtain an equalized initial restored signal; The equalized initial recovery signal is demodulated according to a preset demodulation method to obtain the communication information.

9. The optical communication sensing integrated method according to claim 1, characterized in that: The sending part further includes: when there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and the signal value of each point in the initial signal sequence is not less than zero, is equal to 1; When there is no signal with an amplitude exceeding a preset peak value in the initial signal sequence, and there is a point with a signal value less than zero in the initial signal sequence, Equal to 2.

10. An optical communication perception integrated system based on cyclic prefix clipping enhancement, characterized in that: The system includes a sending device and a receiving device; The sending device includes: A signal generating module, configured to generate at least one initial signal sequence of length N carrying communication information, where N is a positive integer; The shear enhancement module is used to determine whether there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence. When there is a signal with an amplitude exceeding a preset peak value in the initial signal sequence, the initial signal sequence is sheared and enhanced by the following formula to obtain a value of length The enhanced signal sequence is divided into L block sequences, where the length of the block sequence is N, and L is an integer not less than 3: ， in, Indicates the mth enhanced signal sequence The signal value of the point, The value is ; Indicates the mth initial signal sequence The signal value of the point Pick hour, is the actual signal value, when Pick hour, The value is 0; is a preset peak value used to perform trimming processing on the initial signal sequence; It is expressed as the following formula: ； The cyclic prefix adding module is used to add a cyclic prefix to each block sequence. The signal is used as a cyclic prefix, and the cyclic prefix is ​​copied and added to the front end of the corresponding block sequence to obtain a cyclic prefix enhanced signal; wherein, is the preset cyclic prefix length; the length of the block sequence with the cyclic prefix added is , = +N; the length of the cyclic prefix enhanced signal is ; a signal conversion and sending module, configured to generate an optical signal based on the cyclic prefix enhanced signal and send the optical signal to a receiving device; The receiving device includes: a signal receiving and converting module, configured to receive the optical signal from the transmitting device and convert the optical signal to obtain a signal sequence to be processed; A signal reconstruction module, configured to perform inverse shearing enhancement processing on the signal sequence to be processed to obtain a reconstructed signal sequence; A correlation calculation module is used to perform a correlation operation on the reconstructed signal sequence to determine an estimated value of the symbol offset, thereby obtaining an initial restored signal sequence; wherein the length of the initial restored signal sequence is ; a cyclic prefix removal module, configured to remove the cyclic prefix from the initial recovered signal sequence to obtain a target recovered signal corresponding to the initial signal sequence; An information recovery module, configured to perform information recovery processing on the target recovery signal to obtain communication information; A delay determination module, configured to determine the delay according to the estimated value of the symbol offset; The distance and speed measurement module is used to determine the distance and relative speed between the sending device and the receiving device according to the time delay.

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