TW202145732A - Spread spectrum signal sending and receiving method, device and equipment and medium - Google Patents

Abstract

The embodiment of the invention discloses a spread spectrum signal sending method, device and equipment and a medium. The method comprises the following steps: in a signal transmission process, obtaining a preset residual frequency offset tolerance threshold, and determining a spread spectrum modulation optimization parameter; obtaining at least one information unit, wherein the number of the information units is matched with the spread spectrum modulation optimization parameter; spreading the information units by adopting a Hadamard matrix to form spread spectrum signals, and modulating the spread spectrum signals and sending the modulated spread spectrum signals to signal receiving equipment, wherein the spread spectrum modulation optimization parameters are used for being provided for the signal receiving equipment in advance so as to indicate the signal receiving equipment to correct a signal de-spreading result. According to the embodiment of the invention, the tolerable frequency offset of the system can be increased, the complexity of frequency offset estimation and frequency offset tracking of the system is reduced, and the implementation cost and complexity of the system are reduced.

Description

Spread spectrum signal transmission method, spread spectrum signal reception method, device, equipment and medium

The present invention relates to the field of Internet of Things communication, for example, to a method for transmitting a spread spectrum signal, a method for receiving a spread spectrum signal, an apparatus, a device and a medium.

Spread spectrum communication has been widely used because of its strong anti-interference ability and good security performance.

In the M-ary orthogonal spread spectrum system, the spread spectrum sequence set consists of M orthogonal codewords of length n. In the modulation process at the transmitting end, every n bits (bit) constitute a modulation symbol (n=log ₂ (M)), and an orthogonal codeword with a corresponding serial number is selected for transmission according to the value of the modulation symbol. At the receiving end, M correlators are usually required to complete the orthogonal despreading operation to determine the sequence number of the transmitted spreading sequence, thereby obtaining the modulation message. Usually, the frequency of the signal will shift during the transmission process. During demodulation, the frequency offset can be estimated and compensated to reduce the frequency offset. However, the frequency offset cannot be completely eliminated. The compensated frequency offset The shift amount is the residual frequency offset. The M-ary orthogonal spread spectrum modulation technique usually requires that the residual frequency offset of the spread spectrum sequence is small.

The accuracy of frequency offset compensation can be improved by increasing the preamble length and using a high-precision synchronization algorithm for frequency offset estimation; and by improving the stability of the crystal oscillator, the introduction of frequency offset can be reduced. However, the aforementioned methods all require high-cost hardware equipment support, which greatly increases the spread spectrum system. system cost.

【Prior technical literature】 None

Embodiments of the present invention provide a method for transmitting a spread spectrum signal, a method for receiving a spread spectrum signal, an apparatus, equipment and a medium, which can increase the tolerable frequency offset of a system, reduce the complexity of system frequency offset estimation and frequency offset tracking, and reduce system implementation. cost and complexity.

In a first aspect, an embodiment of the present invention provides a method for transmitting a spread spectrum signal, including:

In the process of signal transmission, the preset residual frequency offset tolerance threshold is obtained, and the optimized parameters of spread spectrum modulation are determined;

Acquiring at least one message unit, the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter;

Each of the aforementioned message units is spread spectrum by using Hadamard matrix to form a spread spectrum signal, and the aforementioned spread spectrum signal is modulated and sent to the signal receiving device, wherein the aforementioned spread spectrum modulation optimization parameters are used to provide the aforementioned signal receiving device in advance , to instruct the aforementioned signal receiving device to correct the signal despreading result.

In a second aspect, an embodiment of the present invention further provides a method for receiving a spread spectrum signal, include:

In the process of signal transmission, a despreading result of the spread spectrum signal is obtained, and the aforementioned despreading result is determined by despreading the aforementioned spread spectrum signal by using the Hadamard matrix spreading technique;

Obtaining spread spectrum modulation optimization parameters, where the aforementioned spread spectrum modulation optimization parameters are determined according to a preset residual frequency offset tolerance threshold;

The aforementioned despreading result is modified according to the aforementioned spread spectrum modulation optimization parameters, and at least one message unit is determined, and the number of the aforementioned message units matches the aforementioned spread spectrum modulation optimization parameters.

In a third aspect, an embodiment of the present invention further provides a device for transmitting a spread spectrum signal, including:

The spread spectrum modulation optimization parameter determination module is configured to obtain a preset residual frequency offset tolerance threshold in the process of signal transmission, and determine the spread spectrum modulation optimization parameters;

a message unit acquisition module, configured to acquire at least one message unit, the number of the foregoing message units being matched with the foregoing spread spectrum modulation optimization parameters;

The signal spread spectrum module is configured to use a Hadamard matrix to spread the spectrum of each of the aforementioned message units, form a spread spectrum signal, and send the aforementioned spread spectrum signal to the signal receiving device after modulation, wherein the aforementioned spread spectrum modulation optimization parameter It is used to provide the signal receiving device in advance to instruct the signal receiving device to revise the signal despreading result.

In a fourth aspect, an embodiment of the present invention further provides a spread spectrum signal receiving apparatus, including:

The spread spectrum signal despreading module is configured to obtain the despreading result of the spread spectrum signal in the process of signal transmission. ;

The spread spectrum modulation optimization parameter acquisition module is configured to acquire the spread spectrum modulation optimization parameters, and the aforementioned spread spectrum modulation optimization parameters are determined according to the preset residual frequency offset tolerance threshold;

The despreading result correction module is configured to correct the aforementioned despreading result according to the aforementioned spread spectrum modulation optimization parameters, and determine at least one message unit, and the number of the aforementioned message units matches the aforementioned spread spectrum modulation optimization parameters.

In a fifth aspect, an embodiment of the present invention further provides a signal sending device, including a memory, a processor, and a computer program stored in the memory and running on the processor. The processor executes the computer program. The method for transmitting a spread spectrum signal according to any one of the embodiments of the present invention.

In a sixth aspect, an embodiment of the present invention also provides a signal receiving device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor. The processor executes the computer program. The method for receiving a spread spectrum signal according to any one of the embodiments of the present invention.

In a seventh aspect, an embodiment of the present invention also provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, any one of the embodiments of the present invention is implemented. The method for transmitting a spread spectrum signal may implement the method for receiving a spread spectrum signal as described in any of the embodiments of the present invention.

In the embodiment of the present invention, in the process of signal transmission, according to the residual frequency offset tolerance threshold, the optimized parameters of spread spectrum modulation are determined, and the number of message units is specified according to the optimized parameters of spread spectrum modulation, and the number of the message units is a single spread spectrum modulation The number of message bits carried by the sequence, the number of which A number of message units are used as valid data transmitted in the same unit time, which is spread spectrum and modulated, sent to the signal receiving equipment, and instructs the signal receiving equipment to modify the signal despreading result by optimizing the parameters of spread spectrum modulation, so that the signal can receive The device obtains accurate despreading results, realizes that the accuracy of signal despreading is improved by optimizing the number of transmitted message units, and solves the problems of high implementation cost and high complexity of reducing residual frequency offset in the related art. The original design of the hardware is changed, the implementation cost and complexity are reduced, the stability of the spread spectrum system is improved, the precision of the despreading result is improved, and the transmission efficiency is taken into account.

12: Computer Equipment

14: External devices

16: Processing unit

20: Network Adapter

22: Interface

24: Display

28: System Memory

30: Random Access Memory

32: Cache memory

34: Storage System

40: Programs/Utilities

42: Program Module

101: Spread spectrum signal despreading module

102: Spread spectrum modulation optimization parameter acquisition module

103: Despreading result correction module

610: Signal sending equipment

620: Signal receiving equipment

710: Serial to Parallel Converter

720: Multiplexer

730: Shaped Filter

740: Upconverter

750: Antenna

760: Hadamard Matrix

810: Antenna

820: Downconverter

830: Downsampler

840: Serial to Parallel Converter

850: Correlator

860: Peak Comparator

870: Despreading result correction processor

880: Parallel to Serial Converter

910: Spread Spectrum Modulation Optimization Parameter Determination Module

920: Information unit acquisition module

930: Signal Spread Spectrum Module

[Fig. 1] A schematic diagram of an autocorrelation peak output by a correlator in the related art.

2 is a flowchart of a method for transmitting a spread spectrum signal in Embodiment 1 of the present invention.

[FIG. 3] A schematic diagram of an autocorrelation peak output by a correlator under a residual frequency offset in an embodiment of the present invention.

[FIG. 4] A schematic diagram of an autocorrelation peak output by a correlator under another residual frequency offset in an embodiment of the present invention.

5 is a flowchart of a method for receiving a spread spectrum signal according to the second embodiment of the present invention.

[FIG. 6] A schematic diagram of an application scenario to which an embodiment of the present invention is applicable.

[FIG. 7] A schematic diagram of a signal sending device in Embodiment 3 of the present invention.

[FIG. 8] A schematic diagram of a signal receiving device in Embodiment 3 of the present invention.

FIG. 9 is a schematic structural diagram of a spread spectrum signal sending apparatus according to Embodiment 4 of the present invention.

10 is a schematic structural diagram of a spread spectrum signal receiving apparatus according to Embodiment 5 of the present invention.

[FIG. 11] A schematic structural diagram of a computer device in Embodiment 6 of the present invention.

The present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

In order to facilitate understanding of the embodiments of the present invention, the Hadamard matrix spread spectrum technology is described:

A Hadamard matrix is an n-order square matrix composed of +1 and -1 elements and satisfying H _n *H _n '=nI (where H _n ' is _{the transposed matrix of H n} , and I is the identity square matrix). In a Hadamard matrix, the row vectors of any two rows are orthogonal to each other, and the column vectors of any two columns are orthogonal to each other. The signal sending device takes M= ²ⁿ row vectors as the M-ary orthogonal spreading sequence set, and selects the matched row vectors as the orthogonal spreading sequence _{according to n=log 2 (M) bits for transmission.} Since the row vectors of any two rows are mutually orthogonal, the value of the product between the same row vectors is the largest, that is, each row vector has autocorrelation. The signal receiving device uses M correlators that match the M row vectors of the Hadamard matrix to perform despreading operations, and selects the correlator identification information (such as the correlator serial number) corresponding to the maximum correlation value from the outputs of the M correlators as the despreading operation. Spread the output, determine the row vector of the spread spectrum according to the identification information of the correlator, and the modulation symbol represented by the row vector is the effective data to be transmitted.

In an example, n=12, M=4096, in the Hadamard matrix, the row vectors are numbered from top to bottom, wherein the row vector with the serial number 500 is used as the spreading sequence, and at the same time, the row vector is numbered according to the number of the row vector. , corresponding to the number of the configured correlator, the i-th correlator multiplies the demodulated signal by the i-th row vector to calculate the peak value, which is actually the amplitude, where i is greater than or equal to less than 0 and less than n. As shown in Figure 1, the peaks of the M correlator outputs are shown.

Due to the orthogonality of each row vector in the Hadamard matrix, only the correlator with serial number 500 outputs the peak value, and the output peak value of the other correlators is 0. According to the peak value comparison of the correlators, the effective data carried by the spread spectrum sequence can be obtained.

【Example】

Example 1

2 is a schematic diagram of a flowchart of a method for transmitting a spread spectrum signal in Embodiment 1 of the present invention. This embodiment is applicable to the case of transmitting signals based on the Hadamard matrix spread spectrum technology. The device is implemented by a frequency signal sending device, which can be implemented in software and/or hardware, and can generally be integrated into computer equipment. As shown in FIG. 2, the method of this embodiment may include:

S110, in the process of signal transmission, obtain a preset residual frequency offset tolerance threshold, and determine an optimization parameter of spread spectrum modulation.

The process of signal transmission may refer to the process of transmitting signals using the multi-level orthogonal spread spectrum technology. The process of signal transmission can be in the application scenario of long-distance low-power narrow-band communication Internet of Things. In this application scenario, the signal transmission data rate is low and the sensitivity is high. Under the premise of anti-interference characteristics, the data transmission efficiency is improved by increasing the number of message bits carried by the single spreading sequence. Among them, the transmission of the signal using the multi-ary orthogonal spread spectrum technology may be: obtaining multiple bits, that is, effective transmission data, as a modulation symbol, within the same unit time (the unit time may refer to the allocated time slice), for The modulation symbol is subjected to multi-ary quadrature spread spectrum to generate a spread spectrum signal, which is then modulated to form a radio frequency signal that is sent to the outside world. Signal receiving equipment. Therefore, within the unit time, a set number of bits are transmitted at the same time.

The residual frequency offset tolerance threshold may refer to the maximum value of the residual frequency offset. The residual frequency offset tolerance threshold may be a value pre-input by the user, or may be a value preset by the system. The spread spectrum modulation optimization parameter is used to determine the maximum number of bits transmitted in parallel in the same unit time, that is, the spread spectrum modulation optimization parameter is used to specify the number of message units transmitted in the same unit time. The residual frequency offset tolerance threshold is used to determine the spread spectrum modulation optimization parameters, thereby indirectly determining the maximum number of bits transmitted in parallel in the same unit time. The maximum number of bits can be selected for transmission in the same unit time, so as to ensure the accuracy of the despreading result while taking into account the transmission efficiency. In some embodiments, the optimized parameters of the spread spectrum modulation may be calculated according to the corresponding relationship between the preset residual frequency offset tolerance threshold and the optimized parameters of the spread spectrum modulation, wherein the corresponding relationship is obtained according to experiments.

In fact, there is a frequency offset phenomenon during signal transmission, and after frequency compensation, there is still a residual frequency offset. The residual frequency offset leads to the wrong despreading result of the signal receiving equipment. When the signal to be despread has a residual frequency offset, for example, when the normalized residual frequency offset is 0.2, the peaks output by the M correlators in the previous example are shown in FIG. 3 . In fact, the residual frequency offset destroys the orthogonality of the row vectors in the Hadamard matrix. Due to the existence of the residual frequency offset, not only the correlator with serial number 500 has peaks, but also multiple correlators that are originally orthogonal. However, based on the maximum peak judgment criterion, the system can still correctly obtain the valid data carried by the spread spectrum sequence. It shows that the system has a certain anti-frequency offset capability. However, when the normalized residual frequency offset is greater than 0.5, the peak value of other correlators (such as the correlator with serial number 2620) caused by the residual frequency offset is already greater than the peak value of the correct correlator, as shown in Figure 4, causing the signal receiving equipment to obtain the wrong value. Valid data carried by the spreading sequence.

In view of this, when there is residual frequency offset, due to the inherent relationship between the peak number of the correct correlator and the peak number of the wrong correlator, the part with the previous number can be selected to spread spectrum. The sequence set performs a spreading operation, that is, reducing the number of bits transmitted in the same unit time. It can be understood that there is a corresponding relationship between the residual frequency offset and the number of bits transmitted in the same unit time.

The Hadamard matrix has the following iterative structure:

It can be seen from the iterative characteristics:

的方波訊號，其中，B為帶寬，n為所述哈達瑪矩陣的階數。由此，哈達瑪矩陣的下半矩陣相當於上半矩陣與單位頻率訊號的乘積。 The row vector of the Hadamard matrix is an even row, which can be divided into two matrices up and down. The order n of the Hadamard matrix is greater than 2, and n is a non-negative integer. The spreading sequence represented by each row vector of the Hadamard matrix is the period Signs of sexual change. The unit frequency signal is the unit frequency

where B is the bandwidth and n is the order of the Hadamard matrix. Therefore, the lower half of the Hadamard matrix is equivalent to the product of the upper half matrix and the unit frequency signal.

The 2/4 matrix of the Hadamard matrix is equivalent to the product of the 1/4 matrix and twice the unit frequency signal; the 3/4 matrix of the Hadamard matrix is equivalent to the product of the 1/4 matrix and the unit frequency signal; 4/4 of the Hadamard matrix The matrix is equivalent to the product of the 1/4 matrix and the unit frequency signal, but the initial phase of the 4/4 matrix of the Hadamard matrix and the 3/4 matrix of the Hadamard matrix are different.

Based on the above characteristics, if the residual frequency offset is less than the unit frequency, the row vector of the upper half of the matrix may be misjudged as the row vector of the lower half of the matrix at the corresponding position. For example, the vector at the p position may be misjudged as the vector at the p+2 ^n-1 position. Similarly, if there is a frequency offset less than twice the unit frequency, the vector corresponding to the 1/4 matrix may be misjudged as the vector corresponding to the 2/4 matrix, 3/4 matrix or 4/4 matrix. For example, the vector at the p position may be misjudged as A vector of p+2 ^n-2 , p+2*2 ^n-2 or p+3*2 ^n-2.

It should be noted that the normalized residual frequency offset refers to that the residual frequency offset is normalized in units of unit frequencies.

Optionally, the obtaining a preset residual frequency offset tolerance threshold and determining the spread spectrum modulation optimization parameters include:

Based on the following formula, calculate the optimized parameter d of spread spectrum modulation:

Wherein, A is the residual frequency offset tolerance threshold, B is the bandwidth, n is the order of the Hadamard matrix, and d is a non-negative integer.

In some embodiments, since the formula is an inequality, the calculated d may have multiple values, which may be determined as required, for example, the minimum value may be selected. In fact, d can be infinitely large, but the larger d, the smaller the number of message bits carried by the spread spectrum sequence transmitted at the same time, and the corresponding transmission efficiency is reduced. It can be seen that the smaller d is when the above formula is met , the higher the transmission efficiency.

為30.5Hz，A為32Hz。公式為1.05<2^d-1，d大於1.07。可以選擇d為2。 For example, B=125KHz, n=12, normalized unit frequency

is 30.5Hz and A is 32Hz. The formula is 1.05<2 ^d-1 , and d is greater than 1.07. You can choose d to be 2.

By determining the corresponding relationship between the residual frequency offset tolerance threshold and the spread spectrum modulation optimization parameters according to the iterative characteristics of the Hadamard matrix in advance, the spread spectrum modulation optimization parameters are calculated according to the residual frequency offset tolerance threshold to ensure the objectiveness of the spread spectrum modulation optimization parameters. Thus, the accuracy of the despreading result is improved.

As in the previous example, when the residual frequency offset is less than 1 unit frequency, and the row vector in the 500th row is used as the spreading sequence, ^{the correlators with the serial numbers of 500 and 500+2 n-1} will both appear autocorrelation peaks. Similarly, when the residual frequency offset is less than twice the unit frequency offset, and the row vector of the 500th row is used as the spreading sequence, the sequence numbers are ^{500, 500+2 n-2} , 500+2*2 ^n-2 and 500+ The 3*2 ^n-2 correlators all have autocorrelation peaks. By analogy, when the residual frequency offset is less than 2 ^d-1 unit frequency offset, the correlator with the serial number of 500+(2 ^j -1) 2 ^nd will have an autocorrelation peak, and j is greater than or equal to 0 and less than or equal to d. Exemplarily, when n is 3, and the row vector of the first row is used as the spreading sequence, and there is a residual frequency offset, the correlators with serial numbers 1 and 5 will both appear autocorrelation peaks, and the correlator with serial number 1 determines The valid data is 001, and the valid data determined by the correlator with the serial number 5 is 101. For another example, when n is 4 and the row vector of the first row is used as the spreading sequence, the correlations with serial numbers 1, 5 and 9 are The autocorrelation peak appears in the correlator, the valid data determined by the correlator with serial number 1 is 0001, the valid data determined by the correlator with serial number 5 is 0101, and the valid data determined by the correlator with serial number 9 is 1001. Therefore, the deviation of the correlator serial number caused by the residual frequency offset will only cause errors in the high-order bits of the valid data, and will not affect the low-order bits of the valid data. Thus, the high-order bits in the valid data can be directly zeroed.

S120: Acquire at least one information unit, where the number of the information units matches the spread spectrum modulation optimization parameter.

The message unit is used to transmit to the signal receiving device as a valid message, and a message unit may refer to a bit. In fact, a plurality of message units may be transmitted simultaneously in the same unit time, and the number of message units may refer to the number of message units transmitted simultaneously. Wherein, the number of simultaneously transmitted message units is determined according to the spread spectrum modulation optimization parameter.

Optionally, the acquiring at least one information unit, where the number of the information units matches the spread spectrum modulation optimization parameter, includes: determining the maximum number of message bits carried by the spread spectrum sequence according to the spread spectrum modulation optimization parameter; A plurality of message units are acquired, and the number of message units is the maximum number of message bits.

The maximum number of message bits carried by the spreading sequence may refer to the maximum number of bits transmitted in the same unit time. It should be noted that in the n-order Hadamard matrix spread spectrum technology, the maximum number of bits transmitted in the same unit time is n. Correspondingly, using the spread spectrum signal sending method according to the embodiment of the present invention, in some embodiments, the maximum number of message bits carried by the current spread spectrum sequence is the difference between n and the minimum value of the spread spectrum modulation optimization parameter, that is, the maximum number of message bits. k _max =n-spread spectrum modulation optimization parameter minimum value d _min .

In fact, in the application scenario based on the Hadamard matrix spread spectrum technology, the number of bits that can be transmitted in the same unit time is determined according to the order of the Hadamard matrix. Generally, selecting the maximum number of bits that can be transmitted to form a modulation symbol can increase the number of bits transmitted in the same unit time and improve the transmission efficiency. However, in this way, a high-complexity synchronization algorithm or a high-stability crystal oscillator is required to reduce the frequency offset and increase the cost of frequency offset compensation. In view of this, the embodiment of the present invention determines the acceptable maximum number of bits that can be transmitted in the same unit time according to the residual frequency offset tolerance threshold, and selects bits for signal transmission, so as to ensure the accuracy of the despreading result while taking into account the transmission. efficient.

In some embodiments, the number of message units may also be selected as the number of message units smaller than the maximum number of message bits (positive integer) carried by the spread spectrum sequence formed based on the multi-ary spread spectrum modulation technology.

S130: Spread spectrum on each of the message units by using a Hadamard matrix to form a spread spectrum signal, modulate and send it to a signal receiving device, wherein the spread spectrum modulation optimization parameter is used to be provided to the signal receiving device in advance to indicate the The signal receiving device corrects the signal despreading result.

The Hadamard matrix spread spectrum method can be to obtain a plurality of consecutive message units, according to In each message unit, valid data is determined, and a row vector matching the valid data is selected from the Hadamard matrix to generate a spread spectrum sequence as a spread spectrum signal. Exemplarily, a plurality of consecutive information units are respectively: 0, 1 and 0, that is, binary 010, which is equivalent to decimal 2, and the row vector of the second row in the Hadamard matrix (the first row is the 0th row) can be selected to generate an expansion. frequency sequence as a spread spectrum signal. Correspondingly, in the signal receiving device, the correlator with the serial number of 2 outputs the peak value. Therefore, the signal receiving device determines that the spreading sequence is the row vector of the second row, representing binary 010, that is, the effective data transmitted are 0, 1 and 0.

The signal receiving device can select the despreading result corresponding to the correlator with the previous serial number as the despreading result according to the optimized parameters of the spread spectrum modulation, thus, the despreading result corresponding to the wrong correlator can be excluded, thereby ensuring the accuracy of the despreading result. sex.

In the embodiment of the present invention, in the process of signal transmission, the spread spectrum modulation optimization parameter is determined according to the residual frequency offset tolerance threshold, and the number of message units is specified according to the spread spectrum modulation optimization parameter, and the number of message units is regarded as the same unit time. The valid data transmitted in the internal transmission is spread spectrum and modulated, sent to the signal receiving equipment, and instructs the signal receiving equipment to correct the signal despreading results by optimizing the parameters of spread spectrum modulation, so that the signal receiving equipment can obtain accurate despreading results. By optimizing the number of transmitted message units, the accuracy of signal despreading is improved, which solves the problems of high implementation cost and high complexity of reducing residual frequency offset in the related art, without changing the original design of the hardware, The implementation cost and complexity are reduced, the stability of the spread spectrum system is improved, the precision of the despreading result is improved, and the transmission efficiency is taken into account.

Embodiment 2

5 is a flowchart of a method for receiving a spread spectrum signal according to the second embodiment of the present invention. This embodiment is applicable to the case of transmitting signals based on the Hadamard matrix spread spectrum technology. It is implemented by the spread spectrum signal receiving apparatus provided in the embodiment, and the apparatus can be implemented by means of software and/or hardware, and can generally be integrated into computer equipment. The method of this embodiment may include:

S210 , in the process of signal transmission, obtain a despreading result of the signal, and the despreading result is determined by despreading the spread spectrum signal by using the Hadamard matrix spreading technique.

For the content in this embodiment, reference may be made to the description in any of the above-mentioned embodiments.

The spread spectrum signal is actually a signal obtained by demodulating the signal sent by the signal sending device. In the signal generating equipment, the Hadamard matrix spread spectrum technique is used to spread the signal, and correspondingly, the Hadamard matrix spread spectrum technique is used in the signal receiving equipment to despread the signal. In some embodiments, the signal receiving device configures a correlator corresponding to each row vector of the Hadamard matrix, and the correlator is used to multiply the spread spectrum signal by the matched row vector. If the spread spectrum signal is a matched row vector As a spread spectrum sequence, there is an autocorrelation between the spread spectrum signal and the matched row vector, and the correlator outputs an autocorrelation peak. By querying the correlator that outputs the autocorrelation peak, the row vector matching the correlator can be determined, thereby determining the valid data represented by the row vector as the despreading result.

The despreading result is a valid data, and the valid data includes a plurality of consecutive bits. For example, the valid data 010 in the previous example includes three bits of 0, 1 and 0.

S220: Obtain a spread spectrum modulation optimization parameter, where the spread spectrum modulation optimization parameter is determined according to a preset residual frequency offset tolerance threshold.

The acquisition method may include: receiving an input message from the user, and extracting the spread spectrum modulation optimization parameters from the input message; or acquiring the spread spectrum modulation optimization parameters sent by the signal sending device before signal transmission. It should be noted that the signal refers to the signal carrying the message unit.

S230, modifying the despreading result according to the spread spectrum modulation optimization parameter positive, and determine at least one message unit, the number of which matches the spread spectrum modulation optimization parameter.

k

2^d-1)，可以藉由計算相關器的序號與k*2^n-d的差值，確定準確的相關器的序號。實際上，由於減少了在同一單位時間內的傳輸的比特的數量，從而未採用序號在後的行向量生成擴頻序列，也即，得到準確解擴結果的相關器的序號小於2^n-d。在一些實施例中，修正方式可以是，計算相關器的序號與k*2^n-d的差值，直至相關器的序號小於2^n-d，將修正後的相關器對應的解擴結果作為修正數據。 In fact, as in the previous example, the correlators with serial numbers of ^{500, 500+2 n-2} , 500+2*2 ^n-2 and 500+3*2 ^n-2 all have autocorrelation peaks, that is, autocorrelation peaks appear The difference between the serial numbers of the correlators is k*2 ^nd (1

k

2 ^d -1), the exact serial number of the correlator can be determined by calculating the difference between the serial number of the correlator and k*2 ^nd. In fact, since the number of transmitted bits in the same unit time is reduced, the row vector with the later sequence number is not used to generate the spreading sequence, that is, the sequence number of the correlator that obtains an accurate despreading result is less than 2 ^nd . In some embodiments, the correction method may be to calculate ^{the difference between the serial number of the correlator and k*2 nd} until the serial number of the correlator is less than 2 ^nd , and use the despreading result corresponding to the corrected correlator as correction data.

It can be seen from the foregoing that the deviation of the correlator serial number caused by the residual frequency offset will only cause errors in the high-order bits of the valid data, and will not affect the low-order bits of the valid data. The high bits in the despreading result can be corrected to obtain correct valid data, so as to determine the actually transmitted message unit.

Optionally, modifying the despreading result according to the spread spectrum modulation optimization parameter, and determining at least one message unit, where the number of the message units matches the spread spectrum modulation optimization parameter, includes: The bit position matching the spread spectrum modulation optimization parameter in the spreading result is zero to obtain correction data; according to the correction data, at least one information unit is determined, and the number of the information unit matches the spread spectrum modulation optimization parameter.

The despreading result is the valid data carried in the spread spectrum signal, and the despreading result is the data composed of a plurality of consecutive message units. This valid data may be wrong. The corrected data is the correct valid data. The bits matching the spread spectrum modulation optimization parameter may refer to, in the order from high to low, the first target number of bits, and the target number is equal to the spread spectrum modulation optimization parameter. Exemplary, d=2, the despreading result is 1101, the first 2 bits are set to zero, and the correction data is 0001.

It can be seen from the foregoing that when n is 4 and the row vector of the first row is used as the spreading sequence, the valid data determined by the correlator with the correct sequence number 1 is 0001, and the valid data determined by the correlator with the wrong sequence number 5 is 0101, the valid data determined by the erroneous correlator with serial number 9 is 1001. It can be seen from this that when d=2, the number of error bits of valid data is the first highest order bit and the second highest order bit, that is, the number of wrong high order bits is at most two. When d=1, the number of false high bits is at most one. Therefore, the first d high-order bits in the valid data can be directly set to zero to determine the despreading result.

Correcting the despreading result may be: setting the bits of the bits matching the optimized parameters of spread spectrum modulation in each valid data to zero to obtain correct valid data, and splitting it into multiple consecutive message units according to the valid data.

According to the relationship between the despreading results, the spread spectrum modulation optimization parameters and the correction data, the correction method of the correction data is determined, and the accurate despreading results can be obtained quickly, the accuracy of the despreading is improved, and the efficiency of error correction is improved.

Optionally, after obtaining the spread spectrum modulation optimization parameter, the method further includes: if the value of the bit that matches the spread spectrum modulation optimization parameter in the despreading result is zero, then determining at least one message unit according to the despreading result. , the number of the message units matches the spread spectrum modulation optimization parameter.

In the despreading result, the value of the bits matching the optimized parameters of spread spectrum modulation is zero, indicating that the despreading result is a correct despreading result, and the message unit is directly determined according to the despreading result.

By judging the despreading result and not correcting when the despreading result is correct, the efficiency of despreading is improved.

In the embodiment of the present invention, in the process of signal transmission, the despreading result is corrected according to the optimized parameters of spread spectrum modulation, so as to obtain an accurate despreading result without changing the original design of the hardware, thereby reducing the implementation cost and complexity, The accuracy of the despreading result is improved, while taking into account the transmission efficiency.

Embodiment 3

FIG. 6 is a schematic diagram of an application scenario in Embodiment 3 of the present invention. The spread spectrum signal sending method described in any one of the embodiments of the present invention can be applied to the signal sending device 610 , and the spread spectrum signal receiving method described in any one of the embodiments of the present invention is applied to the signal receiving device 620 .

7 , the signal transmitting device may include a serial-parallel converter 710 , a multiplexer 720 , a shaping filter 730 , an up-converter 740 , an antenna 750 and a Hadamard matrix 760 .

The serial-to-parallel converter 710 is configured to perform parallel conversion on the message stream to be sent, which can be a 1:nd conversion relationship, and convert a message stream into nd bits for parallel transmission in the same unit time, and the nd bits can be transmitted as one modulation symbol.

Hadamard matrix 760 is configured to generate a spread spectrum signal matched to each row vector.

A multiplexer (MUX) 720 is configured to select an output from the spread spectrum signal generated by the Hadamard matrix 760 according to the n-d bits transmitted in parallel.

The shaping filter 730 is configured to perform shaping filtering on the spread spectrum signal output by the multiplexer 720 , which may be such that the signal has a limited bandwidth and is subjected to variable rate processing to suit channel transmission.

The upconverter 740 is configured to perform radio frequency on the shaped filtered spread spectrum signal The modulation may be to modulate the shaped and filtered spread spectrum signal onto a high frequency carrier to form a radio frequency signal.

The antenna 750 is configured to transmit radio frequency signals externally.

In some embodiments, the processor of the signaling device is configured to control the input of the serial-to-parallel converter 710 to instruct the serial-to-parallel converter 710 to convert n-d bits in the same unit of time.

The processor of the signaling device is also configured to control which channel of spread spectrum signal output the multiplexer 720 selects. In some embodiments, the processor of the signal sending device adopts the spread spectrum signal sending method provided by the embodiment of the present invention to determine the spread spectrum modulation optimization parameter d, and according to the correspondence between the nd bits and the row vector in the Hadamard matrix, Select the target row vector that matches the nd bits from the first 2 ^nd (ordered from top to bottom) row vectors of the Hadamard matrix, generate a spread spectrum signal, and control the multiplexer 720 to switch to output the spread spectrum signal. The circuit is turned on to achieve spread spectrum.

In fact, for an M×M Hadamard matrix, the signal transmitting device can transmit at most n=log ₂ (M) bits in the same unit time, and the row vector that can be used as a spreading sequence in the Hadamard matrix is the first M= 2 ⁿ row vectors. In the spread spectrum signal sending method provided by the embodiment of the present invention, the signal sending device can transmit nd bits at most in the same unit time, and the first 2 ^nd row vectors in the Hadamard matrix that can be used as the spread spectrum sequence are the first 2 nd row vectors. It can be understood that the embodiment of the present invention does not change the hardware structure of the signal transmission device, but only adjusts the serial-to-parallel conversion rate of the serial-parallel converter 710 to ensure the number of bits transmitted and the spread spectrum modulation in the same unit time. The optimized parameters are matched, and the despreading result is corrected at the signal receiving device accordingly, so as to improve the accuracy of the despreading result.

The schematic diagram of the structure of the signal receiving device is shown in FIG. 8. The signal receiving device may include an antenna 810, a downconverter 820, a downsampler 830, a serial-to-parallel converter 840, a correlator 850, a peak comparator 860, and a correction process for the despreading result. 870 and a parallel-serial converter 880.

The antenna 810 is configured to receive the radio frequency signal sent by the signal sending device.

Downconverter 820 is configured to demodulate the radio frequency signal received by antenna 810 .

The downsampler 830 is configured to downsample the demodulated signal according to the symbol rate to obtain discrete signals as the spread spectrum signal to be despread.

The serial-to-parallel converter 840 is configured to convert the spread-spectrum signal into M-channels of the spread-spectrum signal according to a 1:M conversion relationship, and transmit them to different correlators 850 in parallel.

Different correlators 850 match different Hadamard matrix row vectors. The correlator 850 is configured to multiply the spread spectrum signal by the row vector of the matched Hadamard matrix. If the spread spectrum signal is generated by using the matched row vector as the spread spectrum sequence, the spread spectrum signal and the matched row vector have autocorrelation, and the correlator 850 outputs the peak value of the autocorrelation peak.

The peak comparator 860 is configured to compare the outputs of the M correlators 850, and determine the sequence number of the correlator 850 with the largest peak value, and use the valid data represented by the row vector of the Hadamard matrix corresponding to the sequence number as the despreading result, and provide The processor 870 is corrected for the despreading result. Usually the despreading result includes n bits.

The despreading result correction processor 870 obtains the optimized parameters of spread spectrum modulation, and corrects the despreading result provided by the peak comparator 860 . In some embodiments, the low n-d bits are truncated in the despreading result, that is, the high d bits are zeroed, so as to eliminate the judgment error of the serial number of the correlator 850 caused by the residual frequency offset.

The despreading result correction processor 870 sends the corrected despreading result to the parallel-serial converter 880 .

The parallel-serial converter 880 is configured to convert the despreading result into a message stream with n-d bits according to the conversion relationship of n-d:1, and complete the transmission of the message stream from the signal sending device to the signal receiving device.

In fact, in the embodiment of the present invention, after the despreading result is determined, a step of correcting the despreading result is added, so as to eliminate the judgment error of the serial number of the correlator 850 caused by the residual frequency offset. The correction step can be performed by the peak comparator 860, or can also be completed by the processor of the signal receiving device, so that the hardware structure of the signal transmitting device is not changed, but only by adding a correction algorithm of the despreading result, the despreading The result is corrected to improve the accuracy of the despreading result.

It should be noted that FIG. 7 and FIG. 8 only show part of the structure, the signal sending device and the signal receiving device may also include other modules and circuits, which can be set as required.

In the embodiment of the present invention, the signal transmission device is used to determine the spread spectrum modulation optimization parameter according to the residual frequency offset tolerance threshold, and the number of message units is designated according to the spread spectrum modulation optimization parameter, and the number of message units is regarded as the valid transmission in the same unit time. The data is spread spectrum and modulated, sent to the signal receiving device, and the despreading result is corrected in the signal receiving device according to the optimized parameters of the spread spectrum modulation, without changing the original hardware of the signal sending device and the signal receiving device. The design reduces the implementation cost, and at the same time, in the signal receiving device, the bit position zero operation is used to realize the correction of the despreading result, which reduces the complexity of implementation, and at the same time improves the stability of the spread spectrum system, improves the accuracy of the despreading result, and takes into account the transmission efficiency at the same time.

Embodiment 4

FIG. 9 is a schematic diagram of an apparatus for transmitting a spread spectrum signal according to Embodiment 4 of the present invention. The fourth embodiment is a corresponding device for implementing the spread spectrum signal sending method provided by the above-mentioned embodiments of the present invention. The device can be realized by software and/or hardware, and can generally be integrated into computer equipment, such as a processor of a signal sending device. middle.

Correspondingly, the apparatus of this embodiment may include:

The spread spectrum modulation optimization parameter determination module 910 is configured to obtain a preset residual frequency offset tolerance threshold in the process of signal transmission, and determine the spread spectrum modulation optimization parameter;

a message unit obtaining module 920, configured to obtain at least one message unit, the number of the message unit being matched with the spread spectrum modulation optimization parameter;

The signal spread spectrum module 930 is configured to use a Hadamard matrix to spread the spectrum of each of the message units to form a spread spectrum signal and modulate it and send it to the signal receiving device, wherein the spread spectrum modulation optimization parameters are used to pre-provide to the signal receiving device to instruct the signal receiving device to modify the signal despreading result.

In some embodiments, the spread spectrum modulation optimization parameter determination module 910 , the message unit acquisition module 920 and the signal spread spectrum module 930 may refer to modules in the processor of the signal sending device.

In the embodiment of the present invention, in the process of signal transmission, the spread spectrum modulation optimization parameter is determined according to the residual frequency offset tolerance threshold, and the number of message units is specified according to the spread spectrum modulation optimization parameter, and the number of message units is regarded as the same unit time. The valid data transmitted in the internal transmission is spread spectrum and modulated, sent to the signal receiving equipment, and instructs the signal receiving equipment to correct the signal despreading results by optimizing the parameters of spread spectrum modulation, so that the signal receiving equipment can obtain accurate despreading results. By optimizing the number of transmitted message units, the accuracy of signal despreading can be improved, solving It solves the problems of high implementation cost and high complexity of reducing the residual frequency offset in the related art, without changing the original design of the hardware, reducing the implementation cost and complexity, and at the same time improving the stability of the spread spectrum system and improving the stability of the despreading result. Accuracy, while taking into account the transmission efficiency.

In some embodiments, the spread spectrum modulation optimization parameter determination module 910 includes: a spread spectrum modulation optimization parameter calculation unit, configured to calculate the spread spectrum modulation optimization parameter d based on the following formula:

Wherein, A is the residual frequency offset tolerance threshold, B is the bandwidth, n is the order of the Hadamard matrix, and d is a non-negative integer.

In some embodiments, the message unit acquisition module 920 includes: a maximum transmission quantity determination unit, configured to determine the maximum number of message bits carried by the spread spectrum sequence according to the spread spectrum modulation optimization parameter; acquire multiple A message unit, the number of which is the maximum number of message bits.

The above-mentioned apparatus can execute the spread spectrum signal sending method provided by the embodiment of the present invention, and has functional modules and functions corresponding to the execution method.

Embodiment 5

FIG. 10 is a schematic diagram of a spread spectrum signal receiving apparatus according to Embodiment 5 of the present invention. The fifth embodiment is a corresponding device for implementing the spread spectrum signal receiving method provided by the above-mentioned embodiments of the present invention. The device can be implemented in software and/or hardware, and can generally be integrated into computer equipment, such as a processor of a signal receiving device. middle.

Correspondingly, the apparatus of this embodiment may include:

The spread spectrum signal despreading module 101 is configured to obtain the despread of the signal during the signal transmission process. Spreading result, the despreading result is determined by despreading the spread spectrum signal by adopting the Hadamard matrix spreading technique;

The spread spectrum modulation optimization parameter acquisition module 102 is configured to acquire the spread spectrum modulation optimization parameters, the spread spectrum modulation optimization parameters are determined according to a preset residual frequency offset tolerance threshold;

The despreading result correction module 103 is configured to correct the despreading result according to the spread spectrum modulation optimization parameter, and determine at least one message unit, the number of which is matched with the spread spectrum modulation optimization parameter .

In some embodiments, the spread spectrum signal despreading module 101 , the spread spectrum modulation optimization parameter obtaining module 102 and the despreading result correction module 103 may refer to modules in the despreading result correction processor of the signal receiving device.

In the embodiment of the present invention, in the process of signal transmission, the despreading result is corrected according to the optimized parameters of spread spectrum modulation, so as to obtain an accurate despreading result without changing the original design of the hardware, thereby reducing the implementation cost and complexity, The accuracy of the despreading result is improved, while taking into account the transmission efficiency.

In some embodiments, the despreading result correction module 103 includes: a high-bit zeroing unit configured to zero the bit position in the despreading result that matches the spread spectrum modulation optimization parameter to obtain correction data; The correction data determines at least one information unit, and the number of the information units matches the spread spectrum modulation optimization parameter.

In some embodiments, the spread spectrum signal receiving apparatus further includes: a despreading result determination module, configured to, after obtaining the spread spectrum modulation optimization parameters, if the bits in the despreading result match the spread spectrum modulation optimization parameters If the value of the bit is zero, at least one message unit is determined according to the despreading result, and the number of the message unit matches the spread spectrum modulation optimization parameter.

The above-mentioned apparatus can execute the method for transmitting a spread spectrum signal provided by the embodiment of the present invention, It has function modules and functions corresponding to the execution method.

Embodiment 6

FIG. 11 is a schematic structural diagram of a computer device according to Embodiment 6 of the present invention. Figure 11 shows a block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention. The computer device 12 shown in FIG. 11 is only one example. Computer device 12 may include a signal sending device or a signal receiving device.

As shown in FIG. 11, computer device 12 takes the form of a general-purpose computing device. Components of computer device 12 may include: one or more processors or processing units 16, system memory 28, and a bus 18 connecting various system components including system memory 28 and processing unit 16. Computer device 12 may be a device attached to the bus.

The bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of a variety of bus structures. For example, these architectures may include Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, enhanced ISA bus, Video Electronics Standards Association (Video Electronics Standards Association, VESA) local bus and PerIPheral Component Interconnect (PCI) bus.

Computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 12, including both volatile and nonvolatile media, removable and non-removable media.

System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and/or cache memory 32 . calculate The computer device 12 may further include other removable/non-removable, volatile/non-volatile computer system storage media. For example only, storage system 34 may be used to read and write to non-removable, non-volatile magnetic media (commonly referred to as "hard drives"). Hard disk drives for reading and writing to removable non-volatile hard disks (such as "floppy disks") and removable non-volatile optical disks (such as Compact Disc Read-Only Memory) can be provided. Only Memory, CD-ROM)), DVD read-only memory (Digital Video Disc-Read Only Memory, DVD-ROM) or other optical media) optical disc drive for reading and writing. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. System memory 28 may include at least one program product having a set (eg, at least one) of program modules configured to perform the functions of embodiments of the present invention.

A program/utility 40 having a set (at least one) of program modules 42, which may be stored, for example, in system memory 28, such program modules 42 may include an operating system, one or more application programs, other program modules As well as program data, each or some combination of these examples may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods of the described embodiments of the present invention.

Computer device 12 may also communicate with one or more external devices 14 (eg, keyboard, pointing device, display 24, etc.), may also communicate with one or more devices that enable a user to interact with computer device 12, and/or communicate with Any device (eg, network card, modem, etc.) that enables the computer device 12 to communicate with one or more other computing devices. Such communication may be performed via the Input/Output (I/O) interface 22 . In addition, the computer device 12 can also communicate with one or more networks (eg, Local Area Network (LAN) and Wide Area Network (WAN)) through the network adapter 20 . As shown, the network adapter 20 communicates with other modules of the computer equipment 12 via the bus 18 . It should be understood that other hardware and/or software modules that may be used in conjunction with the computer device 12 may include: microcode, device drivers, redundant processing units, Redundant Arrays of Inexpensive Disks (RAID) systems, Tape drives and data backup storage systems, etc.

The processing unit 16 executes various functional applications and data processing by running the programs stored in the system memory 28. For example, a signal sending device implements the spread spectrum signal sending method provided by any embodiment of the present invention, or a signal receiving device realizes the present invention. A spread spectrum signal receiving method provided by any embodiment of the invention.

Embodiment 7

Embodiment 7 of the present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the methods provided by all the application embodiments of the present invention:

That is, when the program is executed by the processor, the program is implemented: in the process of signal transmission, the preset residual frequency offset tolerance threshold is obtained, and the spread spectrum modulation optimization parameter is determined; The spread spectrum modulation optimization parameters are matched; each of the message units is spread spectrum by using a Hadamard matrix to form a spread spectrum signal, which is modulated and sent to the signal receiving device, wherein the spread spectrum modulation optimization parameters are used to pre-provide the signal receiving device. The device is used to instruct the signal receiving device to revise the signal despreading result.

Or, when the program is executed by the processor: in the process of signal transmission, obtain the despreading result of the signal, and the despreading result is determined by despreading the spread spectrum signal by using the Hadamard matrix spread spectrum technology; obtain the spread spectrum frequency modulation optimization parameters, the spread spectrum modulation optimization parameters are determined according to a preset residual frequency offset tolerance threshold; If correction is made, and at least one message unit is determined, the number of message units matches the spread spectrum modulation optimization parameter.

The computer storage medium in the embodiment of the present invention may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. Examples (a non-exhaustive list) of computer-readable storage media may include: electrical connections having one or more wires, portable computer hard disks, hard disks, RAM, Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM), flash memory, optical fiber, portable CD-ROM, optical memory, magnetic memory, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code therein. Such propagated data signals may take a variety of forms and may include electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium, other than a computer-readable storage medium, that can transmit, propagate, or transport a program for use by or in connection with the instruction execution system, apparatus, or device .

Program code embodied on a computer-readable medium may be transmitted using any suitable medium, which may include wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional procedural languages, or a combination thereof. Programming language - such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any kind of network - including a LAN or WAN - or may be connected to an external computer (eg via an internet connection using an internet service provider) .

Claims (11)

A method for transmitting a spread spectrum signal, which is characterized in that it comprises: In the process of signal transmission, the preset residual frequency offset tolerance threshold is obtained, and the optimized parameters of spread spectrum modulation are determined; Acquiring at least one message unit, the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter; Each of the aforementioned message units is spread spectrum by using Hadamard matrix to form a spread spectrum signal, and the aforementioned spread spectrum signal is modulated and sent to the signal receiving device, wherein the aforementioned spread spectrum modulation optimization parameters are used to provide the aforementioned signal receiving device in advance , to instruct the aforementioned signal receiving device to correct the signal despreading result. According to the method described in item 1 of the scope of the patent application, the above-mentioned acquisition of the preset residual frequency offset tolerance threshold value and the determination of the optimized parameters of the spread spectrum modulation include: Based on the following formula, calculate the optimized parameter d of spread spectrum modulation:

Wherein, A is the aforementioned residual frequency offset tolerance threshold, B is the bandwidth, n is the order of the aforementioned Hadamard matrix, and d is a non-negative integer. According to the method described in item 1 of the scope of the patent application, at least one information unit is obtained, and the number of the information units matches the optimized parameters of the spread spectrum modulation, including: Determine the maximum number of message bits carried by the spread spectrum sequence according to the aforementioned spread spectrum modulation optimization parameters; A plurality of message units are acquired, and the number of the foregoing message units is the foregoing maximum number of message bits. A spread spectrum signal receiving method, characterized in that it includes: In the process of signal transmission, a despreading result of the spread spectrum signal is obtained, and the aforementioned despreading result is determined by despreading the aforementioned spread spectrum signal by using the Hadamard matrix spreading technique; Obtaining spread spectrum modulation optimization parameters, where the aforementioned spread spectrum modulation optimization parameters are determined according to a preset residual frequency offset tolerance threshold; The aforementioned despreading result is modified according to the aforementioned spread spectrum modulation optimization parameters, and at least one message unit is determined, and the number of the aforementioned message units matches the aforementioned spread spectrum modulation optimization parameters. The method described in item 4 of the scope of the application, wherein the above-mentioned despreading result is modified according to the above-mentioned spread-spectrum modulation optimization parameters, and at least one message unit is determined, and the number of the aforesaid information units matches the above-mentioned spread-spectrum modulation optimization parameters ,include: Zeroing the bit position matched with the aforementioned spread spectrum modulation optimization parameter in the aforementioned despreading result to obtain corrected data; According to the aforementioned correction data, at least one message unit is determined, and the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter. According to the method described in item 5 of the scope of the patent application, after obtaining the optimized parameters of spread spectrum modulation, the aforementioned method further includes: Based on the judgment result that the value of the bits matching the spread spectrum modulation optimization parameter in the despreading result is zero, at least one message unit is determined according to the despreading result, and the number of the information unit matches the spread spectrum modulation optimization parameter. A spread spectrum signal transmission device is characterized in that it comprises: The spread spectrum modulation optimization parameter determination module is configured to obtain a preset residual frequency offset tolerance threshold in the process of signal transmission, and determine the spread spectrum modulation optimization parameters; a message unit acquisition module, configured to acquire at least one message unit, the The number matches with the aforementioned spread spectrum modulation optimization parameters; The signal spread spectrum module is configured to use a Hadamard matrix to spread the spectrum of each of the aforementioned message units, form a spread spectrum signal, and send the aforementioned spread spectrum signal to the signal receiving device after modulation, wherein the aforementioned spread spectrum modulation optimization parameter It is used to provide the signal receiving device in advance to instruct the signal receiving device to revise the signal despreading result. A spread spectrum signal receiving device is characterized in that it comprises: The spread spectrum signal despreading module is configured to obtain the despreading result of the spread spectrum signal in the process of signal transmission. ; The spread spectrum modulation optimization parameter acquisition module is configured to acquire the spread spectrum modulation optimization parameters, and the aforementioned spread spectrum modulation optimization parameters are determined according to the preset residual frequency offset tolerance threshold; The despreading result correction module is configured to correct the aforementioned despreading result according to the aforementioned spread spectrum modulation optimization parameters, and determine at least one message unit, and the number of the aforementioned message units matches the aforementioned spread spectrum modulation optimization parameters. A signal sending device is characterized in that it comprises a memory, a processor, and a computer program stored in the memory and running on the processor, when the processor executes the computer program, the invention is described as the first in the scope of the patent application. To the spread spectrum signal transmission method described in any one of the 3 items. A signal receiving device is characterized in that it includes a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor executes the computer program to achieve the fourth invention in the scope of the patent application. To the spread spectrum signal reception method described in any one of the 6 items. A computer-readable storage medium, which is characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the spread spectrum signal as described in any one of items 1 to 3 of the scope of the patent application is realized. A transmission method, or a spread spectrum signal reception method as described in any one of items 4 to 6 of the scope of the patent application.

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