TWI722942B - Spread spectrum signal sending method, spread spectrum signal receiving method, device, equipment and medium - Google Patents

Abstract

The invention provides a spread spectrum signal transmission method, a spread spectrum signal reception method, device, equipment and medium. The spread spectrum signal sending method includes: obtaining a preset residual frequency deviation tolerance threshold during signal transmission, and determining a spread spectrum modulation optimization parameter; obtaining at least one message unit, and the number of the message unit corresponds to the spread spectrum Modulation optimization parameter matching; using a Hadamard matrix to spread spectrum for each of the message units to form a spread spectrum signal and send the spread spectrum signal to the signal receiving device after being modulated, wherein the spread spectrum modulation is optimized The parameter is used to provide the signal receiving device in advance to instruct the signal receiving device to correct the signal despreading result. The invention can increase the tolerable frequency offset of the system, reduce the complexity of system frequency offset estimation and frequency offset tracking, and reduce the cost and complexity of system realization.

Description

Spread spectrum signal sending method, spread spectrum signal receiving method, device, equipment and medium

The present invention relates to an Internet of Things communication field, such as a spread spectrum signal transmission method, a spread spectrum signal reception method, device, equipment and medium.

Spread spectrum communication has been increasingly widely used due to its strong anti-interference ability and good security performance.

In the M-ary orthogonal spread spectrum system, the spread sequence set is composed 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 the orthogonal codeword of the corresponding sequence 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 and determine the sequence number of the transmitted spreading sequence to obtain the modulated 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. The frequency offset cannot be completely eliminated. The compensated frequency offset The amount of shift is the residual frequency offset. The M-ary orthogonal spread spectrum modulation technology usually requires that the residual frequency offset of the spread spectrum sequence is small.

The frequency offset can be estimated by increasing the length of the preamble and a highly accurate synchronization algorithm to improve the accuracy of frequency offset compensation; it can also reduce the introduction of frequency offset by improving the stability of the crystal oscillator. However, the aforementioned methods all require the support of higher-cost hardware equipment, which greatly increases the spread spectrum system. The cost of the system.

【Prior Technical Literature】 None

The embodiments of the present invention provide a spread spectrum signal transmission method, a spread spectrum signal reception method, device, equipment and medium, which can increase the tolerable frequency offset of the system, reduce the complexity of system frequency offset estimation and frequency offset tracking, and reduce system implementation Cost and complexity.

In the 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 deviation tolerance threshold is obtained, and the optimization 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;

The Hadamard matrix is used to spread each of the aforementioned message units 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 provided to the aforementioned signal receiving device in advance , To instruct the aforementioned signal receiving equipment to correct the signal despreading result.

In the second aspect, embodiments of the present invention also provide a method for receiving spread spectrum signals, include:

In the process of signal transmission, the 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 spread spectrum technology;

Obtaining optimization parameters of spread spectrum modulation, and the foregoing optimization parameters of spread spectrum modulation are determined according to a preset residual frequency deviation tolerance threshold;

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

In the third aspect, an embodiment of the present invention also provides a spread spectrum signal sending device, including:

The spread spectrum modulation optimization parameter determination module is configured to obtain the preset residual frequency deviation tolerance threshold during the signal transmission process to determine the spread spectrum modulation optimization parameter;

The message unit acquisition module is configured to acquire at least one message unit, and the number of the aforementioned message units matches the aforementioned spread spectrum modulation optimization parameter;

The signal spread spectrum module is configured to spread each of the aforementioned message units using a Hadamard matrix to form a spread spectrum signal and send the aforementioned spread spectrum signal to the signal receiving device after being modulated, wherein the aforementioned spread spectrum modulation optimizes the parameters It is 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 fourth aspect, an embodiment of the present invention also provides a spread spectrum signal receiving device, including:

The spread-spectrum signal despreading module is configured to obtain the despreading result of the spread-spectrum signal during signal transmission. The aforementioned despreading result is determined by despreading the aforementioned spread-spectrum signal by using the Hadamard matrix spread spectrum technology ；

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 a preset residual frequency deviation tolerance threshold;

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

In a fifth aspect, an embodiment of the present invention also provides a signal sending device, including a memory, a processor, and a computer program stored on the aforementioned memory and capable of running on the aforementioned processor. The aforementioned processor executes the aforementioned computer program. The spread spectrum signal transmission method as described in any of the embodiments of the present invention.

In a sixth aspect, embodiments of the present invention also provide a signal receiving device, including a memory, a processor, and a computer program stored on the aforementioned memory and running on the aforementioned processor, which is implemented when the aforementioned processor executes the aforementioned computer program The spread spectrum signal receiving method as described in any of the embodiments of the present invention.

In a seventh aspect, an embodiment of the present invention also provides a computer-readable storage medium. The aforementioned computer-readable storage medium stores a computer program, and when the aforementioned computer program is executed by a processor, it can realize the same as described in any of the embodiments of the present invention The spread-spectrum signal transmission method or the implementation of the spread-spectrum signal receiving method as described in any of the embodiments of the present invention.

The embodiment of the present invention determines the optimization parameter of spread spectrum modulation according to the residual frequency deviation tolerance threshold during the signal transmission, and specifies the number of message units according to the optimization parameter of spread spectrum modulation. The number of message units is a single spread spectrum The number of message bits carried by the sequence, the number Measure a message unit as the effective data transmitted in the same unit time, spread spectrum and modulate it, send it to the signal receiving equipment, and instruct the signal receiving equipment to modify the signal despreading result by spread spectrum modulation optimization parameters, so that the signal can be received The equipment obtains accurate despreading results, realizes that by optimizing the number of transmitted message units, the accuracy of signal despreading is improved, and the problem of high cost and complexity of reducing residual frequency offset in related technologies is solved. The original design of the hardware is changed to reduce the implementation cost and complexity, while improving the stability of the spread spectrum system, improving the accuracy of the despreading results, and taking into account the transmission efficiency.

12: Computer equipment

14: external equipment

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: De-expansion result correction module

610: Signal sending equipment

620: signal receiving equipment

710: Serial-to-parallel converter

720: Multiplexer

730: shaping filter

740: Upconverter

750: Antenna

760: Hadamard Matrix

810: Antenna

820: Downconverter

830: down sampler

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: Message unit acquisition module

930: Signal Spread Spectrum Module

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

[Figure 2] A flow chart of a method for transmitting a spread spectrum signal in the first embodiment 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 auto-correlation peak output by a correlator under another residual frequency offset in an embodiment of the present invention.

[Figure 5] A flowchart of a method for receiving spread spectrum signals in the second embodiment of the present invention.

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

[Figure 7] A schematic diagram of a signal sending device in the third embodiment of the present invention.

[Figure 8] A schematic diagram of a signal receiving device in the third embodiment of the present invention.

[Fig. 9] A schematic structural diagram of a spread spectrum signal transmitting device in the fourth embodiment of the present invention.

[Fig. 10] A schematic structural diagram of a spread spectrum signal receiving device in the fifth embodiment of the present invention.

[Figure 11] A schematic structural diagram of a computer device in the sixth embodiment of the present invention.

The present invention will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for ease of description, only a part of the structure related to the present invention is shown in the drawings, but not all of the structure.

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

The Hadamard matrix is an n-th order square matrix composed of +1 and -1 elements and satisfies H _n *H _n '=nI (where H _n 'is _{the transposed matrix of H n} and I is the unit square matrix). In the 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 uses M=2 ⁿ row vectors as the M-ary orthogonal spreading sequence set, and selects the matching row vector as the orthogonal spreading sequence for transmission _{according to n=log 2 (M) bits.} Since the row vectors of any two rows are orthogonal to each other, the value of the product between the same row vectors is the largest, that is, each row vector has autocorrelation. The signal receiving equipment uses M correlators matching the M row vectors of the Hadamard matrix to perform despreading operations, and selects the correlator identification message (such as the correlator serial number) corresponding to the largest correlation value from the M correlators output as the solution Spread output, determine the spreading row vector according to the identification information of the correlator, and the modulation symbol represented by the row vector is the effective data for transmission.

In an example, n=12 and M=4096. In the Hadamard matrix, the row vectors are numbered in order from top to bottom, where the row vector with the sequence number 500 is used as the spreading sequence, and at the same time, the row vector is numbered , Corresponding to the number of the configured correlator, the i-th correlator multiplies the demodulated signal with the i-th row vector to calculate the peak value. The peak value is actually the amplitude, where i is greater than equal At 0, less than n. As shown in Figure 1, the peak output of M correlators is displayed.

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

[Examples]

Example one

2 is a schematic diagram of a flow chart of a method for transmitting a spread spectrum signal in the first embodiment of the present invention. This embodiment is applicable to the case of transmitting signals based on the Hadamard matrix spread spectrum technology. The method can be implemented by the spreading method provided by the embodiment of the present invention. It can be 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 Figure 2, the method of this embodiment may include:

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

The process of signal transmission can refer to the process of signal transmission using the multi-ary orthogonal spread spectrum technology. The signal transmission process can be in the application scenario of long-distance, low-power, narrow-band communication, and the Internet of Things. In this application scenario, the signal transmission data rate is low and the sensitivity is high. The multi-ary orthogonal spread spectrum technology can maintain the spread spectrum technology. Under the premise of anti-interference characteristics, the data transmission efficiency is improved by increasing the number of message bits carried by a single spreading sequence. Among them, the use of multi-ary orthogonal spread spectrum technology to transmit signals can be: obtain multiple bits, that is, effectively transmit data, as a modulation symbol, in the same unit time (the unit time can refer to the allocated time slice), The modulation symbol performs multi-ary orthogonal spread spectrum to generate a spread spectrum signal, and modulate it to form a radio frequency signal and send it to Signal receiving equipment. Thus, in the unit time, a set number of bits can be transmitted simultaneously.

The residual frequency deviation tolerance threshold may refer to the maximum value of the residual frequency deviation. The residual frequency deviation tolerance threshold can be a value input in advance by the user or 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 optimization parameters of spread spectrum modulation, 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, which ensures the accuracy of the despreading result while taking into account the transmission efficiency. In some embodiments, the spread spectrum modulation optimization parameter may be calculated according to the correspondence between the preset residual frequency deviation tolerance threshold and the spread spectrum modulation optimization parameter, wherein the correspondence relationship is obtained based on experiments.

In fact, there is a frequency offset phenomenon in the signal transmission process, and after frequency compensation, there is still a residual frequency offset. The residual frequency offset causes an error in the despreading result of the signal receiving device. When the signal to be despread has a residual frequency offset, for example, when the normalized residual frequency offset is 0.2, the peak output of the M correlators in the previous example is 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 serial number 500 correlator has peaks, but also multiple originally orthogonal correlators will also have peaks. However, based on the maximum peak decision criterion, the system can still correctly obtain the effective data carried by the spreading sequence. Shows that the system has a certain ability to resist frequency offset. 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 an error. Effective data carried by the spreading sequence.

In view of this, when there is a residual frequency offset, because the peak sequence number of the correct correlator and the peak sequence number of the wrong correlator are inherently related, it is possible to select the first part of the spread spectrum The sequence set performs a spread spectrum operation, that is, reduces 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 iteration 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 of the 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; the 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 phases 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 matrix may be misjudged as the row vector of the lower matrix at the corresponding position. For example, the vector at position p may be misjudged as the vector at position p+2 ^n-1 . Similarly, if there is a frequency deviation less than twice the unit frequency, the vector corresponding to the 1/4 matrix may be misjudged as the 2/4 matrix, the vector at the corresponding position of the 3/4 matrix or the 4/4 matrix, for example, the vector at the position p 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 with a unit frequency as a unit.

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

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

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 spreading sequence transmitted at the same time, and the corresponding transmission efficiency is reduced. It can be seen that, in accordance with the above formula, d is smaller , 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

It 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 as 2.

According to the iterative characteristics of the Hadamard matrix in advance, the corresponding relationship between the residual frequency deviation tolerance threshold and the spread spectrum modulation optimization parameter is determined, so as to calculate the spread spectrum modulation optimization parameter according to the residual frequency deviation tolerance threshold value to ensure the objectiveness of the spread spectrum modulation optimization parameter. 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 of the 500th line is used as the spreading sequence, ^{the correlators with serial numbers 500 and 500+2 n-1} will all have auto-correlation peaks. Similarly, when the residual frequency offset is less than twice the unit frequency offset, and the row vector of the 500th line is used as the spreading sequence, the sequence numbers are ^{500, 500+2 n-2} , 500+2*2 ^n-2 and 500+ 3*2 ^n-2 correlators will have auto-correlation peaks. By analogy, when the residual frequency deviation is less than 2 ^d-1 unit frequency deviation, the correlator with serial number 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 a spreading sequence, when there is a residual frequency offset, the correlators with serial numbers 1 and 5 will both have autocorrelation peaks, and the correlator with serial number 1 determines The valid data of is 001, and the valid data determined by the correlator with serial number 5 is 101. For 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 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 correlator sequence number deviation caused by the residual frequency offset will only cause errors in the high bits of the valid data, and will not affect the low bits of the valid data. In this way, the high position in the valid data can be directly zeroed.

S120: Obtain at least one message unit, where the number of the message unit matches the spread spectrum modulation optimization parameter.

The message unit is used as a valid message to be transmitted to the signal receiving device, and a message unit can refer to a bit. In fact, multiple message units can be simultaneously transmitted in the same unit time, and the number of message units can refer to the number of message units that are simultaneously transmitted. Among them, the number of simultaneously transmitted message units is determined according to the optimization parameters of spread spectrum modulation.

Optionally, the obtaining at least one message unit, the number of the message units matching 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; Acquire multiple message units, 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 for the n-th 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 of 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-the minimum value d _{min of the} optimization parameter of spread spectrum modulation.

In fact, in an 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 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 to be transmitted in the same unit time according to the residual frequency deviation tolerance threshold, and selects the bits for signal transmission, so as to ensure the accuracy of the despreading result while taking into account the transmission. effectiveness.

In some embodiments, it is also possible to select as the number of message units less than the maximum number of message bits (positive integer) carried by the spreading sequence formed based on the multi-ary spread spectrum modulation technology as required.

S130. Use a Hadamard matrix to spread spectrum on each of the message units to form a spread spectrum signal and modulate and send it to a signal receiving device, wherein the spread spectrum modulation optimization parameter is used to provide the signal receiving device in advance to instruct the The signal receiving equipment corrects the signal despreading result.

The Hadamard matrix spread spectrum method can be to obtain consecutive multiple message units, according to For 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, multiple consecutive message units are: 0, 1, and 0, which is binary 010, which is equivalent to decimal 2. You can select the row vector of the second row in the Hadamard matrix (the first row is the 0th row) to generate the extension The frequency sequence is used as a spread spectrum signal. Correspondingly, in the signal receiving device, the correlator with serial number 2 outputs the peak value. Therefore, the signal receiving device determines that the spreading sequence is the row vector of the second row, which represents binary 010, that is, the effective data transmitted is 0, 1, and 0.

The signal receiving equipment can optimize the parameters according to the spread spectrum modulation, and select the despreading result corresponding to the correlator with the first sequence number as the despreading result, thus, the despreading result corresponding to the wrong correlator can be eliminated, thereby ensuring the accuracy of the despreading result Sex.

The embodiment of the present invention determines the optimization parameter of spread spectrum modulation according to the residual frequency deviation tolerance threshold during the signal transmission, and specifies the number of message units according to the optimization parameter of spread spectrum modulation, and the number of message units is regarded as the same unit time The effective data transmitted inside is spread spectrum and modulated, sent to the signal receiving device, and instructs the signal receiving device to modify the signal despreading result by spread spectrum modulation optimization parameters, so that the signal receiving device can obtain accurate despreading results. Realize that by optimizing the number of transmitted message units to improve the accuracy of signal despreading, it solves the problem of high implementation cost and high complexity of reducing residual frequency offset in related technologies, and the original design of the hardware can not be changed. Reduce the implementation cost and complexity, at the same time improve the stability of the spread spectrum system, improve the accuracy of the despreading results, while taking into account the transmission efficiency.

Example two

FIG. 5 is a flowchart of a method for receiving spread spectrum signals in 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. The method can be implemented by the present invention. The spread spectrum signal receiving device provided in the illustrated embodiment is implemented. The device can be implemented in software and/or hardware, and generally can be integrated into computer equipment. The method of this embodiment may include:

S210: Obtain a despreading result of the signal in the process of signal transmission, and the despreading result is determined by despreading the spread spectrum signal using the Hadamard matrix spread spectrum technology.

For the content in this embodiment, reference may be made to the description in any of the above 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 technology is used to spread the signal. Correspondingly, the Hadamard matrix spread spectrum technology is used to despread the signal in the signal receiving equipment. In some embodiments, the signal receiving device is configured with a correlator corresponding to each row vector of the Hadamard matrix. The correlator is used to multiply the spread signal with the matched row vector. If the spread signal uses the matched row vector As a spreading sequence, the spreading signal and the matched row vector have autocorrelation, 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, and the valid data represented by the row vector can be determined as the despreading result.

The result of despreading is a valid data, and the valid data includes multiple 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 obtaining method may include: receiving a user's input message and extracting optimization parameters of spread spectrum modulation from the input message; or obtaining optimization parameters of spread spectrum modulation 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: Modify the despreading result according to the spread spectrum modulation optimization parameter. Positive, and at least one message unit is determined, and the number of the message unit 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 ^{500, 500+2 n-2} , 500+2*2 ^n-2 and 500+3*2 ^n-2 will all have auto-correlation peaks, that is, auto-correlation peaks. The difference between the serial numbers of the correlators is k*2 ^nd (1

k

2 ^d -1), the correct 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, because the number of bits transmitted in the same unit time is reduced, the row vector with the subsequent sequence number is not used to generate the spreading sequence, that is, the sequence number of the correlator that obtains the 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 the correction data.

From the foregoing, it can be seen that the correlator sequence number deviation caused by the residual frequency offset will only cause errors in the high bits of the valid data, and will not affect the low bits of the valid data. The high bits in the despreading result can be corrected to obtain correct and effective data, so as to determine the actual transmitted message unit.

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

The despreading result is the effective data carried in the spread spectrum signal, and the despreading result is the data composed of multiple consecutive message units. The valid data may be wrong. The corrected data is correct and valid. The bits matching the optimization parameters of the spread spectrum modulation may refer to the number of bits before the target number in the order from high to low, and the target number is equal to the optimization parameters of the spread spectrum modulation. Exemplary, d=2, the result of despreading is 1101, the first 2 bits are set to zero, and the modified 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 correct correlator with serial number 1 is 0001, and the valid data determined by the wrong correlator with serial number 5 is 0101, the valid data determined by the wrong correlator with serial number 9 is 1001. It can be seen that when d=2, the number of valid data error bits is the first highest bit and the second highest bit, that is, the number of incorrect high bits is two at most. When d=1, the number of high bits of error 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.

The correction of the despreading result can be: zeroing the bits of each valid data that match the optimization parameters of the spread spectrum modulation to obtain the correct valid data, and splitting the valid data into multiple consecutive message units.

By determining the relationship between the despreading result, the spread spectrum modulation optimization parameter, and the corrected data, the correction method of the corrected data can be determined, which can quickly obtain accurate despreading results, improve the accuracy of despreading, and improve the efficiency of error correction.

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

In the despreading result, the value of the bit matching the spread spectrum modulation optimization parameter is zero, indicating that the despreading result is the correct despreading result, and the message unit is determined directly according to the despreading result.

By judging the result of despreading, and when the result of despreading is correct, no correction is made to improve the efficiency of despreading.

In the embodiment of the present invention, by modifying the despreading result according to the optimized parameters of spread spectrum modulation during the signal transmission process, the accurate despreading result is obtained without changing the original design of the hardware, thereby reducing the implementation cost and complexity. Improve the accuracy of despreading results while taking into account transmission efficiency.

Example three

Fig. 6 is a schematic diagram of an application scenario in the third embodiment 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 transmitting 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.

The schematic diagram of the structure of the signal sending device may be as shown in FIG. 7, and the signal sending device may include a serial-to-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 of the message stream to be sent, which can be a 1:nd conversion relationship, and converts a message stream into nd bits for parallel transmission in the same unit time. The nd bits can be It is transmitted as a modulation symbol.

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

The 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 shape and filter the spread spectrum signal output by the multiplexer 720, which can make the signal have a limited bandwidth and perform variable rate processing of the signal to be suitable for channel transmission.

The upconverter 740 is configured to perform radio frequency on the spread spectrum signal after shaping and filtering. Modulation can be to modulate the spread-spectrum signal after shaping and filtering onto a high-frequency carrier to form a radio frequency signal.

The antenna 750 is configured to transmit radio frequency signals to the outside.

In some embodiments, the processor of the signal sending 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 time.

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

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

The structure diagram of the signal receiving device is shown in Figure 8. The signal receiving device may include an antenna 810, a down converter 820, a down sampler 830, a serial-to-parallel converter 840, a correlator 850, a peak comparator 860, and a despreading result correction processing 870 and parallel-serial converter 880.

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

The down converter 820 is configured to demodulate the radio frequency signal received by the antenna 810.

The down-sampler 830 is configured to down-sample the demodulated signal according to the symbol rate to obtain a discrete signal 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 according to a 1:M conversion relationship and transmit the spread-spectrum signal to different correlators 850 in parallel.

The row vectors of the Hadamard matrix matched by different correlators 850 are different. The correlator 850 is configured to multiply the spread signal and the row vector of the matched Hadamard matrix. If the spread spectrum signal uses the matched row vector as the signal generated by 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 serial number of the correlator 850 with the largest peak, and use the valid data represented by the row vector of the Hadamard matrix corresponding to the serial 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 spread spectrum modulation optimization parameter, 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 position is zero, to eliminate the judgment error of the sequence 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-to-serial converter 880.

The parallel-to-serial converter 880 is configured to convert the despreading result into a message stream according to the n-d:1 conversion relationship, 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 correction step for the despreading result is added to eliminate the judgment error of the sequence number of the correlator 850 caused by the residual frequency offset. This 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 sending device is not changed, and only by adding the correction algorithm of the despreading result, the despreading result is improved. 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, and 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 sending device determines the spread spectrum modulation optimization parameter according to the residual frequency deviation tolerance threshold, and specifies the number of message units according to the spread spectrum modulation optimization parameter, and the number of message units is regarded as the effective transmission in the same unit time. The data is spread spectrum and modulated and sent to the signal receiving device, and the despreading result is modified 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 hardware Design, reduce the implementation cost, and at the same time realize the correction of the despreading result by zero bit position operation in the signal receiving device, reduce the complexity of the implementation, and at the same time improve the stability of the spread spectrum system, improve the accuracy of the despreading result, and take into account the transmission efficiency.

Example four

FIG. 9 is a schematic diagram of a spread spectrum signal sending device in the fourth embodiment of the present invention. The fourth embodiment is a corresponding device for implementing the spread-spectrum signal sending method provided in the above embodiment of the present invention. The device can be implemented in software and/or hardware, and can generally be integrated into computer equipment, such as the processor of a signal sending device. in.

Correspondingly, the device of this embodiment may include:

The spread spectrum modulation optimization parameter determination module 910 is configured to obtain a preset residual frequency deviation tolerance threshold during the signal transmission process to determine the spread spectrum modulation optimization parameter;

The message unit acquisition module 920 is configured to acquire at least one message unit, and the number of the message unit matches the spread spectrum modulation optimization parameter;

The signal spreading module 930 is configured to use a Hadamard matrix to spread each of the message units to form a spread spectrum signal and modulate it to be sent to the signal receiving device, wherein the spread spectrum modulation optimization parameter is used to provide Give the signal receiving device to instruct the signal receiving device to correct 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.

The embodiment of the present invention determines the optimization parameter of spread spectrum modulation according to the residual frequency deviation tolerance threshold during the signal transmission, and specifies the number of message units according to the optimization parameter of spread spectrum modulation, and the number of message units is regarded as the same unit time The effective data transmitted inside is spread and modulated, sent to the signal receiving device, and instructs the signal receiving device to modify the signal despreading result by spread spectrum modulation optimization parameters, so that the signal receiving device can obtain accurate despreading results. Realize by optimizing the number of transmitted message units to improve the accuracy of signal despreading, and solve The problem of high implementation cost and high complexity of reducing residual frequency offset in related technologies is solved. The original design of the hardware can be reduced, the implementation cost and complexity can be reduced, and the stability of the spread spectrum system can be improved, and the result of despreading can be improved. Accuracy, while taking into account 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 information unit acquisition module 920 includes: a maximum transmission quantity determination unit configured to determine the maximum number of information bits carried by a spread spectrum sequence according to the spread spectrum modulation optimization parameter; Message unit, the number of message units is the maximum number of message bits.

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

Example five

FIG. 10 is a schematic diagram of a spread spectrum signal receiving device in the fifth embodiment of the present invention. The fifth embodiment is a corresponding device that implements the spread spectrum signal receiving method provided in the above embodiment of the present invention. The device can be implemented in software and/or hardware, and can generally be integrated into computer equipment, such as the processor of a signal receiving device in.

Correspondingly, the device of this embodiment may include:

The spread spectrum signal despreading module 101 is configured to obtain the solution of the signal during signal transmission. A spreading result, where the despreading result is determined by despreading the spread spectrum signal using a Hadamard matrix spread spectrum technique;

The spread spectrum modulation optimization parameter acquisition module 102 is configured to acquire a spread spectrum modulation optimization parameter, the spread spectrum modulation optimization parameter being determined according to a preset residual frequency deviation 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, and the number of the message unit matches the spread spectrum modulation optimization parameter .

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

In the embodiment of the present invention, by modifying the despreading result according to the optimized parameters of spread spectrum modulation during the signal transmission process, the accurate despreading result is obtained without changing the original design of the hardware, thereby reducing the implementation cost and complexity. Improve the accuracy of despreading results while taking into account transmission efficiency.

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

In some embodiments, the spread spectrum signal receiving device further includes: a despreading result determining module, configured to, after obtaining the spread spectrum modulation optimization parameter, if the bits in the despreading result match the spread spectrum modulation optimization parameter 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 device can execute the spread spectrum signal transmission method provided by the embodiment of the present invention, Equipped with functional modules and functions corresponding to the execution method.

Example Six

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 implementing embodiments of the present invention. The computer device 12 shown in FIG. 11 is only an example. The computer device 12 may include a signal sending device or a signal receiving device.

As shown in FIG. 11, the computer device 12 is represented in the form of a general-purpose computing device. The components of the computer device 12 may include: one or more processors or processing units 16, a system memory 28, and a bus 18 connecting different system components (including the system memory 28 and the processing unit 16). The computer device 12 may be a device connected to a bus.

The bus 18 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any bus structure among multiple 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.

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

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

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

The computer device 12 can also communicate with one or more external devices 14 (such as keyboards, pointing devices, displays 24, etc.), and can also communicate with one or more devices that enable users to interact with the computer device 12, and/or communicate with Any device (such as a network card, modem, etc.) that enables the computer device 12 to communicate with one or more other computing devices. This communication can be carried out via an input/output (Input/Output, I/O) interface 22. In addition, the computer device 12 can also communicate with one or more networks (for example, a local area network (LAN), a wide area network (WAN)) through the network adapter 20. As shown in the figure, the network adapter 20 communicates with other modules of the computer device 12 through the bus 18. It should be understood that other hardware and/or software modules that can be used in conjunction with the computer device 12 may include: microcode, device drivers, redundant processing units, external hard disk drive arrays (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 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 implements the present invention. A method for receiving a spread spectrum signal provided by any embodiment of the invention.

Example Seven

The seventh embodiment 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, the method as provided in all the application embodiments of the present invention is implemented:

That is, when the program is executed by the processor, it is realized: in the process of signal transmission, the preset residual frequency deviation tolerance threshold is obtained, and the optimization parameter of spread spectrum modulation is determined; The spread-spectrum modulation optimization parameter matching; the Hadamard matrix is used to spread the spectrum of each of the message units to form a spread-spectrum signal and modulate and send it to the signal receiving device, wherein the spread-spectrum modulation optimization parameter is used to provide the signal receiver in advance Device to instruct the signal receiving device to correct the signal despreading result.

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

The computer storage medium of 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 may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or a combination of any of the above. Examples of computer-readable storage media (non-exhaustive list) may include: electrical connections with one or more wires, portable computer hard disks, hard disks, RAM, read-only memory (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, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, device, or device.

The computer-readable signal medium may include a data signal propagated in baseband or as a part of a carrier wave, and computer-readable program code is carried therein. The transmitted data signal can take many forms, including electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than the computer-readable storage medium. The computer-readable medium can send, propagate, or transmit a program for use by or in combination with the instruction execution system, apparatus, or device .

The program code contained on the computer-readable medium can be transmitted by any suitable medium, which can include wireless, wire, optical cable, radio frequency (Radio Frequency, RF), etc., or any suitable combination of the above.

The computer program code used to perform the operations of the present invention can be written in one or more programming languages or a combination thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, and C++, as well as conventional procedural programming languages. Programming language-such as "C" language or similar programming language. The program code can be executed entirely on the user's computer, partly on the user's computer, executed as an independent software package, partly on the user's computer and partly executed on a remote computer, or entirely executed on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer via any kind of network-including LAN or WAN-or it can be connected to an external computer (for example, using an Internet service provider to connect via the Internet) .

Claims (11)

A method for transmitting a spread spectrum signal, which is characterized by including: In the process of signal transmission, the preset residual frequency deviation tolerance threshold is obtained, and the optimization 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; The Hadamard matrix is used to spread each of the aforementioned message units 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 provided to the aforementioned signal receiving device in advance , To instruct the aforementioned signal receiving equipment to correct the signal despreading result. As in the method described in item 1 of the scope of patent application, the foregoing obtaining the preset residual frequency deviation tolerance threshold and determining the optimization parameters of spread spectrum modulation includes: Based on the following formula, calculate the spread spectrum modulation optimization parameter d:

Among them, A is the aforementioned residual frequency deviation tolerance threshold, B is the bandwidth, n is the order of the aforementioned Hadamard matrix, and d is a non-negative integer. As the method described in item 1 of the scope of the patent application, the aforementioned acquisition of at least one message unit, and the number of the aforementioned message units matching the aforementioned spread spectrum modulation optimization parameters, includes: According to the aforementioned optimization parameters of spread spectrum modulation, determine the maximum number of message bits carried by the spread spectrum sequence; Acquire a plurality of message units, and the number of the aforementioned message units is the aforementioned maximum number of message bits. A method for receiving spread spectrum signals, which is characterized by: In the process of signal transmission, the 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 spread spectrum technology; Obtaining optimization parameters of spread spectrum modulation, and the foregoing optimization parameters of spread spectrum modulation are determined according to a preset residual frequency deviation tolerance threshold; The aforementioned despreading result is modified according to the aforementioned spread spectrum modulation optimization parameter, and at least one message unit is determined, and the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter. The method described in item 4 of the scope of patent application, wherein the aforementioned despreading result is modified according to the aforementioned spread spectrum modulation optimization parameter, and at least one message unit is determined, and the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter ,include: Zero the bit positions in the foregoing despreading results that match the foregoing spread spectrum modulation optimization parameters to obtain the 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. As the method described in item 5 of the scope of patent application, after obtaining the optimized parameters of spread spectrum modulation, the aforementioned method also includes: Based on the judgment result that the value of the bit matching the aforementioned spread spectrum modulation optimization parameter in the aforementioned despreading result is zero, at least one message unit is determined according to the aforementioned despreading result, and the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter. A spread spectrum signal transmission device, which is characterized by comprising: The spread spectrum modulation optimization parameter determination module is configured to obtain the preset residual frequency deviation tolerance threshold during the signal transmission process to determine the spread spectrum modulation optimization parameter; The message unit acquisition module is configured to acquire at least one message unit. The number matches the aforementioned optimization parameters of spread spectrum modulation; The signal spread spectrum module is configured to spread each of the aforementioned message units using a Hadamard matrix to form a spread spectrum signal and send the aforementioned spread spectrum signal to the signal receiving device after being modulated, wherein the aforementioned spread spectrum modulation optimizes the parameters It is used to provide the aforementioned signal receiving device in advance to instruct the aforementioned signal receiving device to correct the signal despreading result. A spread spectrum signal receiving device, which is characterized by comprising: The spread-spectrum signal despreading module is configured to obtain the despreading result of the spread-spectrum signal during signal transmission. The aforementioned despreading result is determined by despreading the aforementioned spread-spectrum signal by using the Hadamard matrix spread spectrum technology ； 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 a preset residual frequency deviation tolerance threshold; The despreading result correction module is configured to correct the aforementioned despreading result according to the aforementioned spread spectrum modulation optimization parameter, and determine at least one message unit, and the number of the aforementioned message unit matches the aforementioned spread spectrum modulation optimization parameter. A signal sending device, which is characterized in that it includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the computer program, it achieves the first in the scope of the patent application. To the spread spectrum signal transmission method described in any of the 3 items. A signal receiving device, characterized in that it includes a memory, a processor, and a computer program stored on the memory and capable of running on the processor. When the processor executes the computer program, it achieves the fourth in the scope of the patent application. To the spread spectrum signal receiving method described in any of the 6 items. A computer-readable storage medium, characterized in that a computer program is stored on the aforementioned computer-readable storage medium, and when the aforementioned computer program is executed by a processor, it realizes the spread spectrum signal described in any one of items 1 to 3 in the scope of the patent application Sending method, or implement the spread spectrum signal receiving method as described in any one of items 4 to 6 in the scope of the patent application.

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