Differential chaotic shift keying modulator, demodulator and method based on reference modulation

Abstract

The present invention discloses a differential chaotic shift keying modulator, demodulator and method based on reference modulation, which realizes reference modulation by PPM modulation, and uses the position of reference signals in different time slots as a dimension of data transmission, so that additional information bits are mapped to specific indexes of active time slots. Therefore, more bits can be transmitted in one symbol under the same transmission energy, thereby obtaining superior bit error rate performance. Compared with the existing code-shift differential chaotic shift keying system method, the present invention improves the transmission rate and energy efficiency of the system. In general, the method realizes reference modulation by PPM modulation; the chaotic mapping is logistic mapping; the present invention improves the transmission rate and energy efficiency of the CS-DCSK system.

Description

Technical Field

[0001] The invention relates to the field of communication technology, and in particular to a differential chaotic shift keying modulator, a demodulator and a method based on reference modulation. Background Art

[0002] In recent years, chaos-based incoherent communication systems have attracted much attention due to their low cost and low power consumption, and have great application potential in short-range wireless communications. As a promising chaos-based incoherent communication system, the Differential Chaos ShiftKeying (DCSK) system has become the most widely studied system due to its simple hardware structure and excellent anti-multipath fading performance.

[0003] However, as a transmission reference (TR) transmission scheme, DCSK has two disadvantages. First, half of the symbol period is used to transmit the reference data, resulting in low data rate and energy efficiency. Second, the long delay circuit of the receiver limits its application in ultra-wideband systems. In order to overcome these two disadvantages, many improved chaotic communication schemes have been proposed in the past two decades. In the prior art, the Code-Shifted Differential ChaosShift Keying (CS-DCSK) system avoids the use of broadband RF delay lines at the receiving end by using Walsh codes instead of time delays, thereby improving the data transmission rate and simplifying the circuit implementation. This scheme sends the reference signal and the information signal in the same time slot, and distinguishes the two by Walsh codes. However, the data rate of the CS-DCSK system is limited by the Walsh code matrix, and its reference signal does not carry any data information, which makes the transmission rate and energy efficiency of the system relatively low. Summary of the invention

[0004] In order to overcome the shortcomings of low transmission rate and energy efficiency in the existing CS-DCSK technology, the present invention proposes a differential chaotic shift keying modulation method based on reference modulation, which can at least solve one of the technical problems in the background technology.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for index differential chaotic shift keying modulation based on reference modulation comprises the following steps:

[0007] Step 1: Generate a length of Discrete chaotic signal sequence .

[0008] Step 2: The discrete chaotic signal sequence generated in step 1 Perform Hilbert transform to generate orthogonal reference chaotic sequence .

[0009] Step 3: Substitute the discrete chaotic signal sequence generated in step 1 copy times, generating q identical discrete chaotic signal sequences .

[0010] Step 4: Generate the bit-parallel index bit and Bit serial modulation bits.

[0011] Step 5: Create the The bit serial modulation bit is polarity-inverted to generate Bit serial bipolar bit.

[0012] Step 6: Create the The bit parallel index bit performs bit sign conversion and changes to a Binary index symbol.

[0013] Step 7: Create the Discrete chaotic signal sequence with the same segment and the one generated in step 5 The bit serial bipolar bits are polarity modulated to generate A modulated signal.

[0014] Step 8: Create the The modulated signals are combined into one signal S.

[0015] Step 9: Generated according to step 6 The binary index symbol converts the orthogonal reference chaotic sequence generated in step 2 into Insert into the specific position of the signal S generated in step 8 to generate a transmission signal, which is sent through the antenna; wherein the insertion rule is: divide the signal S generated in step 8 into subsequences of the same length, according to Subsequences are determined interval positions, and then according to the step 6 generated The binary index symbol converts the orthogonal reference chaotic sequence generated in step 2 into Insert into One of the interval positions.

[0016] The present invention also discloses a modulator of a differential chaotic shift keying modulation method based on reference modulation, comprising a chaotic signal generator, a Hilbert filter, a replicator, a polarity converter, a bit symbol converter, a polarity modulator, and a PPM modulator, wherein:

[0017] The chaotic signal generator is used to generate a discrete chaotic signal sequence .

[0018] The Hilbert filter is used to transform the discrete chaotic signal sequence Perform Hilbert transform to generate orthogonal reference chaotic sequence .

[0019] The replicator is used to replicate the discrete chaotic signal sequence .

[0020] The polarity converter is used to change the modulation bit into a polarity modulation bit.

[0021] The bit-to-symbol converter is used to change index bits into index symbols.

[0022] The polar modulator is used for multiplying polarity modulation bits and discrete chaotic signal sequences to generate a modulation signal.

[0023] The PPM modulator is used to generate The modulated signals are combined into a signal S, and the signal S is divided into subsequences of the same length, according to Subsequences are determined The orthogonal reference chaotic sequence is then Inserted into signal S One of the interval positions.

[0024] On the other hand, the present invention also discloses a reference modulation index-based differential chaotic shift keying demodulation method, comprising the following steps:

[0025] Step S1: Receive the modulated signal from the transmitter and store it in the form of rows into the matrix In which the length of each row element is .

[0026] Step S2: The storage matrix generated in step S1 Each pair of adjacent rows in Row and OK, , No. Row and , and generate Correlation values, stored in row vectors middle.

[0027] Step S3: For the row vector generated in step S2 Take the absolute value of each element in and find the subscript of the element with the smallest absolute value .

[0028] Step S4: The storage matrix generated in step S1 Each pair of intervals is The two rows of elements in the row (i.e. Row and OK, , No. Row and , and generate Correlation values, stored in row vectors middle.

[0029] Step S5: Convert the row vector generated in step S4 Take the absolute value of each element in and find the subscript of the element with the smallest absolute value .

[0030] Step S6: According to the subscript value generated in step S3 and the subscript value generated in step S5 2 Make reference signal position decision and find reference signal In the matrix The row position in , convert the row position L into bit-parallel binary bit, output The demodulation index bit.

[0031] Step S7: Based on the row position generated in step S6 , from the matrix Select the The elements of the row are used as reference signals .

[0032] Step S8: The reference signal generated in step S7 Perform Hilbert transform to generate orthogonal chaotic sequence .

[0033] Step S9: The orthogonal chaotic sequence generated in step S8 With the matrix Except The rest of the line The row elements are related in order, generating related values.

[0034] Step S10: The generated The relevant values ​​are used for threshold decision and output The demodulated bits are demodulated.

[0035] Step S11: The generated The demodulated modulated bits are combined into one demodulated modulated bit stream through parallel-to-serial conversion.

[0036] On the other hand, the present invention also discloses a demodulator of a differential chaotic shift keying demodulation method based on reference modulation, comprising a storage matrix , A correlator, A decision maker, a reference signal position decider, a reference signal acquirer, a Hilbert filter, Threshold decision device, parallel-to-serial converter, where:

[0037] The storage matrix Used to store the modulated signal from the transmitter in the form of lines.

[0038] Said The front of the correlator A correlator is used to transform the matrix Each pair of adjacent rows (i.e. Row and OK, , No. Row and , and generate The relevant value To A correlator is used to convert each pair of intervals in matrix A into The two rows of elements in the row (i.e. Row and OK, , No. Row and , and generate The relevant value to A correlator is used to transform the orthogonal chaotic sequence With the matrix Except The rest of the line The row elements are related in order, generating related values.

[0039] Said A decision arbiter is used to find the index value of the element with the smallest absolute value.

[0040] The reference signal position decision device is based on The decision maker generates The subscript value is used to determine the reference signal In the matrix The row position in .

[0041] The reference signal acquirer is used to obtain the reference signal according to the row position. From the matrix Select the The elements of the row are used as reference signals .

[0042] The Hilbert filter is used to convert the reference signal Perform Hilbert transform to generate orthogonal chaotic sequence .

[0043] Said A threshold decision device is used to The correlation values ​​are used to make a threshold decision with a threshold of zero.

[0044] The parallel-to-serial converter is used to change the generated parallel modulation bits into a serial modulation bit stream.

[0045] On the other hand, the present invention further discloses a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor executes the steps of the above method.

[0046] On the other hand, the present invention further discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0047] It can be seen from the above technical scheme that the differential chaotic shift keying modulation method and system based on reference modulation of the present invention realizes reference modulation by adopting PPM modulation; the chaotic mapping is logistic mapping; the present invention improves the transmission rate and energy efficiency of the CS-DCSK system.

[0048] The present invention uses PPM modulation to implement reference modulation. According to the position of the reference signal in different time slots as a dimension of data transmission, the additional information bits are mapped to the specific index of the active time slot. Therefore, under the same transmission energy, more bits can be transmitted in one symbol, thereby obtaining superior bit error rate performance. Compared with the existing method under the code shift differential chaotic shift keying system, the present invention uses the reference signal position as a data transmission dimension, increases the information bit transmission, and improves the transmission rate and energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is an overall flow chart of an embodiment of the present invention;

[0050] Figure 2 It is a structural schematic diagram of a reference modulation differential chaotic shift keying modulator according to an embodiment of the present invention;

[0051] Figure 3 It is a structural schematic diagram of a reference modulation differential chaotic shift keying demodulator according to an embodiment of the present invention;

[0052] Figure 4 The figure is a comparison diagram of the bit error performance of the modulation and demodulation method of the present invention and the existing CS-DCSK method in an additive white Gaussian noise channel. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0054] In order to verify that the carrier index differential chaotic shift keying modulation and demodulation method based on reference modulation provided by the present invention can improve transmission efficiency and energy efficiency, the present invention cites a verification example for verification and explanation.

[0055] Reference Figure 1 , is an embodiment of the present invention, which provides a differential chaotic shift keying modulation and demodulation method based on reference modulation, including a modulation method and a demodulation method.

[0056] A modulation system of a differential chaotic shift keying modulation method based on reference modulation according to an embodiment of the present invention, such as Figure 2 As shown: including a chaotic signal generator, a Hilbert filter, a replicator, a polarity converter, a bit symbol converter, a polarity modulator, and a PPM modulator, wherein:

[0057] The chaotic signal generator is used to generate a discrete chaotic signal sequence .

[0058] The Hilbert filter is used to transform the discrete chaotic signal sequence Perform Hilbert transform to generate orthogonal reference chaotic sequence .

[0059] The replicator is used to replicate the discrete chaotic signal sequence .

[0060] The polarity converter is used to change the modulation bit into a polarity modulation bit.

[0061] The bit-to-symbol converter is used to change index bits into index symbols.

[0062] The polar modulator is used for multiplying polarity modulation bits and discrete chaotic signal sequences to generate a modulation signal.

[0063] The PPM modulator is used to generate The modulated signals are combined into a signal S, and the signal S is divided into subsequences of the same length, according to Subsequences are determined The orthogonal reference chaotic sequence is then Inserted into signal S One of the interval positions.

[0064] At the transmitting end, the signal is modulated by differential chaotic shift keying based on reference modulation, specifically including:

[0065] Step 1: Select the implementation conditions of the present invention: use one symbol period The length of the inner discrete chaotic signal sequence 160, the number of times the sequence is replicated 3, index bit , modulation bit , send time slot .

[0066] Step 2: In one symbol period The chaotic signal generator generates a discrete chaotic signal sequence with a length of 160. .

[0067] Step 3: Pass the discrete chaotic signal sequence generated in step 2 through the Hilbert filter to generate an orthogonal reference discrete chaotic signal sequence .

[0068] Step 4: Pass the discrete chaotic signal sequence generated in step 2 through a replicator to generate three identical discrete chaotic signal sequences.

[0069] Step 5: Generate parallel index bits 01 with a length of 2 and serial modulation bits 101 with a length of 3 to be transmitted in the current symbol period.

[0070] Step 6: The serial modulation bit 101 generated in step 5 is converted into a bipolar bit +1-1+1 through a polarity converter.

[0071] Step 7: Convert the parallel index bit 01 generated in step 5 into index symbol 1 through a bit symbol converter.

[0072] Step 8: The three identical discrete chaotic signal sequences generated in step 4 and the bipolar bit +1-1+1 generated in step 6 are passed through a polar modulator to generate three modulation signals. , , .

[0073] Step 9: The index symbol generated in step 7, the orthogonal reference discrete chaotic signal sequence generated in step 3 and the modulation signal generated in step 8 are passed through a PPM modulator to generate a transmission signal and send it through an antenna. The transmission signal is in the form of:

[0074]

[0075]

[0076] On the other hand, the present invention also discloses a differential chaotic shift keying demodulation system based on reference modulation, such as Figure 3 As shown, including the storage matrix , A correlator, A decision maker, a reference signal position decider, a reference signal acquirer, a Hilbert filter, Threshold decision device, parallel-to-serial converter, where:

[0077] The storage matrix Used to store the modulated signal from the transmitter in the form of lines.

[0078] Said The front of the correlator A correlator is used to transform the matrix Each pair of adjacent rows (i.e. Row and OK, , No. Row and , and generate The relevant value To A correlator is used to convert each pair of intervals in matrix A into The two rows of elements in the row (i.e. Row and OK, , No. Row and , and generate The relevant value to A correlator is used to transform the orthogonal chaotic sequence With the matrix Except The rest of the line The row elements are related in order, generating related values.

[0079] Said A decision arbiter is used to find the index value of the element with the smallest absolute value.

[0080] The reference signal position decision device is based on The decision maker generates The subscript value is used to determine the reference signal In the matrix The row position in .

[0081] The reference signal acquirer is used to obtain the reference signal according to the row position. From the matrix Select the The elements of the row are used as reference signals .

[0082] The Hilbert filter is used to convert the reference signal Perform Hilbert transform to generate orthogonal chaotic sequence .

[0083] Said A threshold decision device is used to The correlation values ​​are used to make a threshold decision with a threshold of zero.

[0084] The parallel-to-serial converter is used to change the generated parallel modulation bits into a serial modulation bit stream.

[0085] At the receiving end, the signal is received and demodulated, including:

[0086] Step S1: The receiver stores the signal received by the antenna in the form of rows into the matrix In which the length of each row element is .

[0087] Step S2: store the storage matrix of step S1 Before passing correlators, so that the matrix Each pair of adjacent rows in Row and OK, , No. Row and , and generate Correlation values, stored in row vectors middle.

[0088] Step S3: Convert the row vector generated in step S2 Through the decision maker, the row vector Take the absolute value of each element in and find the subscript of the element with the smallest absolute value .

[0089] Step S4: The matrix stored in step S1 Through the to correlators, so that each pair of intervals in matrix A is The two rows of elements in the row (i.e. Row and OK, , No. Row and , and generate Correlation values, stored in row vectors middle.

[0090] Step S5: The row vector generated in step S4 Through the decision arbiter, the row vector Take the absolute value of each element in and find the subscript of the element with the smallest absolute value 2.

[0091] Step S6: Subscript value generated in step S3 and the subscript value generated in step S5 2. Find the reference signal through the reference signal position decider In the matrix The row position , convert the row position L into Bit parallel binary, output The demodulation index bit.

[0092] Step S7: Set the row position generated in step S6 Through the reference signal acquisition device, the reference signal acquisition device obtains the matrix according to the row and column positions. Select the The elements of the row are used as reference signals .

[0093] Step S8: The reference signal generated in step S7 Generate orthogonal chaotic sequence through Hilbert filter .

[0094] Step S9: The orthogonal chaotic sequence generated in step S8 and matrix Through the to correlators, so that the orthogonal chaotic sequence Except The rest of the line The row elements are related in order, generating related values.

[0095] Step S10: The generated in step S9 The correlation values ​​pass through the threshold decision device and Correlation value and threshold value Compare, Output The demodulation rule is: when the correlation value > threshold value When , the demodulated data bits are " ", otherwise, the demodulated data bits are " ”.

[0096] Step S11: Through the parallel-to-serial converter, the output of step S10 is converted to The parallel demodulation modulated bits are combined into The modulated bit stream is serially demodulated.

[0097] Figure 4 ] is the bit error rate performance of the method of the present invention obtained by simulation in an additive white Gaussian noise channel. As a comparison, the figure also shows the bit error rate performance of the existing CS-DCSK method obtained by simulation under the same conditions. It can be seen from the figure that compared with the existing CS-DCSK method, the present invention has better bit error rate performance.

[0098] In summary, the beneficial effects of the present invention are: 1) Under the same conditions as the existing methods, the BER performance is improved; 2) It has a higher transmission rate and energy efficiency.

[0099] On the other hand, the present invention further discloses a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor executes the steps of the above method.

[0100] On the other hand, the present invention further discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0101] In another embodiment provided in the present application, a computer program product including instructions is also provided. When the computer program product is run on a computer, the computer executes any differential chaotic shift keying modulation method based on reference modulation in the above embodiments.

[0102] It is understandable that the system, device and storage medium provided in the embodiments of the present invention correspond to the method provided in the embodiments of the present invention, and the explanation, examples and beneficial effects of the relevant contents can refer to the corresponding parts in the above methods.

[0103] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive Solid State Disk (SSD)), etc.

[0104] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0105] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A differential chaotic shift keying modulation method based on reference modulation, characterized in that: The following steps are included: Step 1: Generate a length of Discrete chaotic signal sequence ; Step 2: Substitute the discrete chaotic signal sequence generated in step 1 Perform Hilbert transform to generate orthogonal reference chaotic sequence ; Step 3: Substitute the discrete chaotic signal sequence generated in step 1 copy times, generate The same discrete chaotic signal sequence ; Step 4: Generate the bit-parallel index bit and Bit serial modulation bits, ; Step 5: Create the The bit serial modulation bit is polarity-inverted to generate bit serial bipolar bit; Step 6: Create the The bit parallel index bit performs bit sign conversion and changes to a Base index symbol; Step 7: Create the The same discrete chaotic signal sequence and the one generated in step 5 The bit serial bipolar bits are polarity modulated to generate A modulated signal; Step 8: Create the The modulated signals are combined into one signal S; Step 9: Generated according to step 6 The binary index symbol converts the orthogonal reference chaotic sequence generated in step 2 into Insert it into the specified position of the signal S generated in step 8 to generate a transmission signal, which is sent through the antenna; wherein the insertion rule is: divide the signal S generated in step 8 into subsequences of the same length, according to Subsequences are determined interval positions, and then according to the step 6 generated The binary index symbol converts the orthogonal reference chaotic sequence generated in step 2 into Insert into One of the interval positions.

2. A reference-modulated differential chaotic shift keying modulator, used to implement the reference-modulated differential chaotic shift keying modulation method according to claim 1, characterized in that: It includes a chaotic signal generator, a Hilbert filter, a replicator, a polarity converter, a bit symbol converter, a polarity modulator, and a PPM modulator, wherein: The chaotic signal generator is used to generate a discrete chaotic signal sequence ; The Hilbert filter is used to transform the discrete chaotic signal sequence Perform the Hilbert transform to generate Orthogonal reference chaotic sequence ; The replicator is used to replicate the discrete chaotic signal sequence ; The polarity converter is used to change the modulation bit into a polarity modulation bit; The bit-to-symbol converter is used to change the index bit into an index symbol; The polar modulator is used to multiply the polarity modulation bit and the discrete chaotic signal sequence to generate a modulation Signal; The PPM modulator is used to generate The modulated signals are combined into a signal S, and the signal S is divided into subsequences of the same length, according to Subsequences are determined The orthogonal reference chaotic sequence is then Inserted into signal S One of the interval positions.

3. A differential chaotic shift keying demodulation method based on reference modulation, characterized in that: The following steps are involved: Step S1: Receive the modulated signal from the transmitter and store it in the form of rows into the matrix In which the length of each row element is ; Step S2: The storage matrix generated in step S1 Correlate each pair of adjacent rows in to generate Correlation values, stored in row vectors middle; Step S3: For the row vector generated in step S2 Take the absolute value of each element in and find the subscript of the element with the smallest absolute value ; Step S4: The storage matrix generated in step S1 Each pair of intervals is The two rows of elements are correlated to generate Correlation values, stored in row vectors middle; Step S5: Convert the row vector generated in step S4 Take the absolute value of each element in and find the subscript of the element with the smallest absolute value ; Step S6: According to the subscript value generated in step S3 and the subscript value generated in step S5 2 Make reference signal position decision and find reference signal In the matrix The row position in , convert the row position L into bit-parallel binary bit, output Path demodulation index bit; Step S7: Based on the row position generated in step S6 , from the matrix Select the The elements of the row are used as reference signals ; Step S8: The reference signal generated in step S7 Perform Hilbert transform to generate orthogonal chaotic sequence ; Step S9: The orthogonal chaotic sequence generated in step S8 With the matrix Except The rest of the line The row elements are related in order, generating Correlation values; Step S10: The generated The relevant values ​​are used for threshold decision and output The demodulation bits are demodulated; Step S11: The generated The demodulated modulated bits are combined into one demodulated modulated bit stream through parallel-to-serial conversion.

4. A demodulator based on reference modulation differential chaotic shift keying, used to implement the reference modulation index differential chaotic shift keying demodulation method according to claim 3, characterized in that: Including storage matrix , A correlator, A decision maker, a reference signal position decider, a reference signal acquirer, a Hilbert filter, Threshold decision device, parallel-to-serial converter, where: The storage matrix Used to store the modulated signal from the transmitting end in the form of lines; Said The front of the correlator A correlator is used to transform the matrix Each pair of adjacent rows is correlated to generate The relevant value To A correlator is used to convert each pair of intervals in matrix A into The two rows of elements are correlated to generate The relevant value; to A correlator is used to transform the orthogonal chaotic sequence With the matrix Except The rest of the line The row elements are related in order, generating Correlation values; Said A decision arbiter is used to find the subscript value of the element with the smallest absolute value; The reference signal position decision device is based on The decision maker generates The subscript value is used to determine the reference signal In the matrix The row position in ; The reference signal acquirer is used to obtain the reference signal according to the row position. From the matrix Select the The elements of the row are used as reference signals ; The Hilbert filter is used to convert the reference signal Perform Hilbert transform to generate orthogonal chaotic sequence ; Said A threshold decision device is used to The correlation values ​​are used to make a threshold decision with a threshold of zero; The parallel-to-serial converter is used to change the generated parallel modulation bits into a serial modulation bit stream.

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