Waveform system of single-carrier wireless communication system based on micro spread spectrum

Abstract

The invention relates to the field of communication signal processing, in particular to a waveform system of a single-carrier wireless communication system based on micro-spread spectrum, in the waveform system, a CDMA mechanism and a non-CDMA mechanism are fused through micro-spread spectrum to obtain a baseband signal, and the baseband signal comprises a plurality of burst waveform signals; wherein the waveform system comprises the step of modulating a burst waveform signal, the burst waveform signal comprises a data part, a pilot frequency part and a guard interval part, and the pilot frequency part and the data part are combined in a superposition mode. And then respectively connecting the guard interval parts to two ends of the combined pilot frequency part and data part so as to obtain a modulated burst waveform signal, and finally generating a baseband signal according to the modulated burst waveform signal. According to the invention, the problem of simultaneous transmission of the peak-to-average ratio, the pilot frequency and the data is solved in a compromise, and meanwhile, a very simple communication system is provided for single-carrier wireless communication.

Description

Technical Field

[0001] The present invention relates to the field of communication signal processing, and more specifically, to a waveform system of a single-carrier wireless communication system based on micro-spread spectrum. Background Art

[0002] Existing single-carrier communication systems can be mainly divided into two systems: CDMA and non-CDMA systems. Both systems can distinguish users and channels from the perspective of time division and frequency division. For CDMA systems, in addition to time division and frequency division, different users and channels can also be distinguished by spread spectrum codes, such as pilot channels, control channels, and data channels.

[0003] Among them, in the CDMA system, its advantage is that multiple channels can be sent at the same frequency at the same time, which is convenient for scheduling, and the pilot channel and other channels can also be sent synchronously, and the real-time performance of channel estimation is good, which is conducive to improving demodulation performance. However, the CDMA system has the disadvantages of increasing the peak-to-average ratio of the signal and reducing the power amplifier power of the radio frequency.

[0004] In non-CDMA systems, its advantages are low signal peak-to-average ratio and high RF power amplifier efficiency, but it has the disadvantage that the pilot channel cannot be sent along with other channels. When the relative movement speed of the communicating parties is high, the pilot channel cannot reflect the actual situation of the channel in time, resulting in poor demodulation performance.

[0005] Therefore, in order to solve the problems existing in the prior art, a single-carrier wireless communication system is provided in the present invention to compromise between the peak-to-average ratio and the problem of simultaneous transmission of pilot and data, and also provides a minimalist communication system suitable for small low-speed communication systems. Summary of the invention

[0006] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide a waveform system of a single-carrier wireless communication system based on micro-spread spectrum, which is used to solve the problems of peak-to-average ratio and simultaneous transmission of pilot and data.

[0007] The technical solution adopted by the present invention is a waveform system of a single-carrier wireless communication system based on micro-spread spectrum, in which CDMA and non-CDMA mechanisms are integrated through micro-spread spectrum to obtain a baseband signal, and the baseband signal includes a plurality of burst waveform signals;

[0008] The waveform system includes modulating a burst waveform signal, the burst waveform signal includes a data part, a pilot part and a guard interval part, the pilot part and the data part are combined by superposition, and then the guard interval part is respectively connected to both ends of the combined pilot part and the data part, so as to obtain a modulated burst waveform signal, and finally generate a baseband signal according to the modulated burst waveform signal;

[0009] And when the pilot part and the data part are combined by superposition, the data symbols and pilot symbols are spread using their own basic spreading codes to form corresponding data code chips and pilot code chips, and then the obtained data code chips and pilot code chips are combined according to a preset power ratio.

[0010] In the present application, a feasible communication mechanism is constructed in a very simple way, which compromises the peak-to-average ratio problem of the signal and the real-time transmission of the pilot symbol. It is particularly suitable for narrowband communication or low throughput scenarios, and effectively solves the problems of increasing the peak-to-average ratio of the signal and reducing the power amplifier power of the RF in the CDMA system, and the pilot cannot be sent along with other channels in the non-CDMA system. When the relative movement speed of the communicating parties is large, the pilot channel cannot reflect the actual situation of the channel in time, resulting in poor demodulation performance and other problems.

[0011] Preferably, under the condition of a given signal-to-noise ratio snr, the optimal power ratio is obtained through simulation according to the principle of optimal performance; under the condition of a given signal-to-noise ratio snr and a processing gain N of channel estimation, the power ratio is calculated according to the principle of maximum demodulation signal-to-noise ratio; under the condition of a given application scenario, the reference signal-to-noise ratio and the processing gain of channel estimation are determined according to a typical scenario of the network, and the power ratio is obtained by simulation or deduction.

[0012] In the prior art, the larger the power ratio of the data code bits and the pilot code bits is, the lower the peak-to-average ratio will be, but the corresponding reception performance of the weak power symbols will be worse. Therefore, in order to obtain an optimal power ratio to reduce the impact of the above situation, in the present application, different methods are adopted to calculate the optimal power ratio for different situations, so that the obtained power ratio is more targeted, while ensuring a large power ratio and a low peak-to-average ratio, and ensuring that the weak power symbols have a certain reception performance.

[0013] Preferably, the preset power ratio is β (d) / β (p) , where β (d) is the power factor of the data symbol, β (p) is the power factor of the pilot symbol, and the power ratio is a floating point number.

[0014] By using the power factor ratio of data symbols to pilot symbols to calculate the power ratio, power allocation can be performed reasonably to ensure that the power of data symbols and pilot symbols is appropriate, thereby enhancing the signal's anti-interference ability. Pilot signals are usually used for channel estimation, and a reasonable power ratio can improve the accuracy of channel estimation, thereby improving data transmission quality. Not only that, it can also help the system to adaptively adjust according to channel conditions to find the optimal power ratio, which helps to optimize the performance of single-carrier wireless communication systems in a simple way and improve signal reliability and robustness.

[0015] Preferably, the number of chips of the data chips and the pilot chips = the number of symbols × the spreading factor SF. Calculating the number of chips by the number of symbols and the spreading factor helps to optimize the anti-interference capability of the signal.

[0016] Preferably, the method further comprises using a baseband composite algorithm to represent the baseband signal, wherein the baseband composite algorithm formula is:

[0017]

[0018] c i =c i+Nc =0,i=0,1,…L GP -1,

[0019]

[0020] Among them, β (d) is the power factor of the data symbol; β (p) is the power factor of the pilot symbol; N S is the number of valid symbols; N C is the number of effective chips; L GP is the length of the guard interval in chips; m is the pilot symbol sequence number, m = 0, 1…M-1, M is the number of pilot symbol sequences; i is the valid chip number; d j is the jth valid data symbol; is the jth pilot symbol in the pilot symbol sequence; is the i′th chip in the spreading sequence of the data symbol; is the i′th chip in the spreading sequence of the pilot symbol; c i =c i+Nc =0,i=0,1,…L GP -1 means that the guard interval signals at both ends are filled with 0; Indicates that the guard interval at the left end is 0; Indicates that the guard interval at the right end is 0.

[0021] Preferably, the data part is further divided into control information and service information, and the control information is used to guide the relevant configuration of the service information and the configuration of other control information; wherein the configuration of the control information in the data part is determined by the pilot symbol sequence in the pilot part.

[0022] The data part may only contain business information, or it may be further divided into control information and business information. Control information is used to manage and control data transmission signals and indicate the relevant configuration of business information, such as modulation method, transmission block size, etc., so that the data business information contains the actual data content that the user wants to transmit. The separation of control information and business information improves the efficiency and reliability of data transmission, enables the communication system to flexibly respond to different application requirements and network conditions, and this structured approach ensures the correct transmission and management of data and adapts to the complexity of modern communication systems.

[0023] Preferably, in the pilot symbol sequence, a nested design is performed on the basis of a basic segment of a baseband signal, so that different pilot symbol sequences carry different control information, wherein the nested design includes:

[0024] S1: Design the length of a basic segment, where the basic segment is composed of a basic spreading code;

[0025] S2: Design top-level sequences The length and type of, where m is the pilot symbol sequence number, and n is the length number of the top sequence;

[0026] S3: Obtain different pilot symbol sequences according to the designed basic segments and top-level sequences, wherein the pilot symbol sequences are:

[0027] Where b is the basic fragment.

[0028] In the present application, the pilot symbol sequence can effectively improve the utilization efficiency of the pilot symbols by performing a nested design based on the basic fragments, making the signal estimation more accurate, thereby improving the demodulation performance of the data symbols, and through a reasonable embedding strategy, it can effectively reduce the multipath effect and interference from other channels, reduce the complexity of sequence detection, and improve the flexibility and adaptability of the system.

[0029] Preferably, the length of the interval protection portion is ≥0.

[0030] Due to multipath propagation in wireless communications, signals usually reach the receiving end through multiple paths, but this phenomenon will cause different versions of the signal to overlap when received, causing inter-symbol interference. Therefore, in order to solve the above problems, in this application, by setting interval protection in the waveform signal and setting its length ≥ 0 to provide sufficient time intervals, the signals of different paths can be separated at the receiving end, reducing the interference caused by overlap and improving the quality of the signal; and setting appropriate interval protection can also effectively utilize the available spectrum. In systems such as OFDM, the setting of interval protection can offset the frequency selective fading of the channel to a certain extent, thereby making the system more efficient in signal transmission in different frequency bands.

[0031] Preferably, the number of the basic spreading codes is two, one for the pilot part and one for the data part. In the present application, selecting appropriate spreading codes for data symbols and pilot symbols for spreading can improve the anti-interference capability and transmission efficiency of the system.

[0032] Preferably, in the pilot part, the pilot signal is modulated using a fixed modulation method, which not only improves the anti-interference and reliability of the signal, but also facilitates channel estimation and synchronization.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. A compromise is made between the peak-to-average ratio of the signal and the real-time transmission of pilot symbols.

[0035] 2. A feasible communication system is constructed in a very simple way, which is especially suitable for low-speed narrowband transmission systems.

[0036] 3. The nested design of spread spectrum symbol sequence is conducive to simplifying the complexity of sequence detection.

[0037] 4. Carrying simple control information through spread spectrum symbol sequences is conducive to simplifying signaling and improving transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the signal structure of a non-CDMA system.

[0039] Figure 2 A schematic diagram of the structure of a burst waveform signal provided in this embodiment. DETAILED DESCRIPTION

[0040] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0041] Example 1

[0042] In the single-carrier communication system, it can be mainly divided into two systems: CDMA system and non-CDMA system. However, there are disadvantages in both systems. In the CDMA system, the peak-to-average ratio of the signal is improved and the power of the RF power amplifier is reduced. In the non-CDMA system, the pilot channel cannot be sent along with other channels. When the relative moving speed of the two communicating parties is large, the pilot channel cannot reflect the actual situation of the channel in time, resulting in poor demodulation performance, such as Figure 1 As shown, Figure 1 A schematic diagram of the signal structure of a non-CDMA system. Figure 1 It can be seen that the channel experienced by the pilot segment can no longer reflect the channel conditions at the end of the data segment.

[0043] Therefore, in view of the above problems, in this embodiment, a waveform system of a single-carrier wireless communication system based on micro-spread spectrum is provided, in which CDMA and non-CDMA mechanisms are integrated through micro-spread spectrum to obtain a baseband signal, and the baseband signal includes a plurality of burst waveform signals;

[0044] Wherein, the waveform system includes modulating the burst waveform signal, such as Figure 2 As shown, Figure 2 A schematic diagram of a burst waveform signal provided in this embodiment, from Figure 2 It can be seen that the burst waveform signal includes a data part, a pilot part and a guard interval part, the pilot part and the data part are combined by superposition, and then the guard interval part is respectively connected to both ends of the combined pilot part and the data part, so as to obtain a modulated burst waveform signal, and finally generate a baseband signal according to the modulated burst waveform signal;

[0045] And when the pilot part and the data part are combined by superposition, the data symbols and pilot symbols are spread using their own basic spreading codes to form corresponding data code chips and pilot code chips, and then the obtained data code chips and pilot code chips are combined according to a preset power ratio.

[0046] In the present application, a feasible communication mechanism is constructed in a very simple way, which compromises the peak-to-average ratio problem of the signal and the real-time transmission of the pilot symbol. It is particularly suitable for narrowband communication or low throughput scenarios, and effectively solves the problems of increasing the peak-to-average ratio of the signal and reducing the power amplifier power of the RF in the CDMA system, and the pilot cannot be sent along with other channels in the non-CDMA system. When the relative movement speed of the communicating parties is large, the pilot channel cannot reflect the actual situation of the channel in time, resulting in poor demodulation performance and other problems.

[0047] Preferably, the data part described in this embodiment is also divided into control information and business information, and the control information is used to guide the relevant configuration of the business information and the configuration of other control information; wherein, the configuration of the control information in the data part is determined by the pilot symbol sequence in the pilot part.

[0048] The data part may only contain business information, or it may be further divided into control information and business information. Control information is used to manage and control data transmission signals and indicate the relevant configuration of business information, such as modulation method, transmission block size, etc., so that the data business information contains the actual data content that the user wants to transmit. The separation of control information and business information improves the efficiency and reliability of data transmission, enables the communication system to flexibly respond to different application requirements and network conditions, and this structured approach ensures the correct transmission and management of data and adapts to the complexity of modern communication systems.

[0049] Preferably, the number of chips of the data chips and the pilot chips = the number of symbols × the spreading factor SF. Calculating the number of chips by the number of symbols and the spreading factor helps to optimize the anti-interference capability of the signal.

[0050] Preferably, the number of the basic spreading codes is two, one for the pilot part and one for the data part. In the embodiment, selecting appropriate spreading codes for data symbols and pilot symbols for spreading can effectively reduce the peak-to-average ratio and improve the anti-interference ability and transmission efficiency of the system.

[0051] Preferably, in the pilot part, the pilot signal is modulated using a fixed modulation method, such as BPSK, QPSK, and 16-QAM. Different modulation methods have different advantages. For BPSK, it is simple to operate and has strong anti-interference performance, which is suitable for low signal-to-noise ratio environments; for QPSK, it transmits two bits in each symbol, which can effectively improve transmission efficiency; for 16-QAM, it combines amplitude and phase modulation, which is suitable for occasions with high bandwidth and good signal quality. Therefore, in this embodiment, a suitable fixed modulation method can be used to modulate the pilot signal, which helps to improve the anti-interference and reliability of the signal, and helps to facilitate channel estimation and synchronization.

[0052] Preferably, under the condition of a given signal-to-noise ratio snr, the optimal power ratio is obtained through simulation according to the principle of optimal performance; under the condition of a given signal-to-noise ratio snr and a processing gain N of channel estimation, the power ratio is calculated according to the principle of maximum demodulation signal-to-noise ratio; under the condition of a given application scenario, the reference signal-to-noise ratio and the processing gain of channel estimation are determined according to a typical scenario of the network, and the power ratio is obtained by simulation or deduction.

[0053] In the prior art, the larger the power ratio of the data code bits and the pilot code bits is, the lower the peak-to-average ratio will be, but the corresponding reception performance of the weak power symbols will be worse. Therefore, in order to obtain an optimal power ratio to reduce the impact of the above situation, in the present application, different methods are adopted to calculate the optimal power ratio for different situations, so that the obtained power ratio is more targeted, while ensuring a large power ratio and a low peak-to-average ratio, and ensuring that the weak power symbols have a certain reception performance.

[0054] Preferably, the preset power ratio is β (d) / β (p) , where β (d) is the power factor of the data symbol, β (p) is the power factor of the pilot symbol, and the power ratio is a floating point number, not limited to an integer.

[0055] By using the power factor ratio of data symbols to pilot symbols to calculate the power ratio, power allocation can be performed reasonably to ensure that the power of data symbols and pilot symbols is appropriate, thereby enhancing the signal's anti-interference ability. Pilot signals are usually used for channel estimation, and a reasonable power ratio can improve the accuracy of channel estimation, thereby improving data transmission quality. Not only that, it can also help the system to adaptively adjust according to channel conditions to find the optimal power ratio, which helps to optimize the performance of single-carrier wireless communication systems in a simple way and improve signal reliability and robustness.

[0056] Further preferably, in this embodiment, the spreading factor SF is set to 2, and the data part uses the basic spreading code

[11] , the pilot part uses the basic spreading code [1 -1], the power ratio of the pilot part of the data part is 3:1, the symbol rate before spreading is 33k per second, the chip rate after spreading is 66k per second, and a complete burst waveform signal is 10ms.

[0057] Preferably, the length of the interval protection part is ≥ 0. In this embodiment, there are 5 symbols at both ends of the waveform signal as the protection interval, and the protection interval length is calculated to be 10 chips according to the chip number calculation formula, wherein the protection interval part does not send any signal, and the protection interval contains 320 symbols, that is, the calculated number of chips is 640.

[0058] Due to multipath propagation in wireless communications, signals usually reach the receiving end through multiple paths, but this phenomenon will cause different versions of the signal to overlap when received, causing inter-symbol interference. Therefore, in order to solve the above problems, in this application, by setting interval protection in the waveform signal and setting its length ≥ 0 to provide sufficient time intervals, the signals of different paths can be separated at the receiving end, reducing the interference caused by overlap and improving the quality of the signal; and setting appropriate interval protection can also effectively utilize the available spectrum. In systems such as OFDM, the setting of interval protection can offset the frequency selective fading of the channel to a certain extent, thereby making the system more efficient in signal transmission in different frequency bands.

[0059] Preferably, as shown in Table 1, Table 1 is a data symbol spreading sequence and a pilot symbol spreading sequence.

[0060]

[0061] Table 1

[0062] In the pilot symbol sequence, a nested design is performed based on the basic segment of the baseband signal, and different pilot symbol sequences carry different control information. For example, 8 different pilot sequences can carry 3-bit information. The nested design can reduce the complexity of sequence detection. In this embodiment, the nested design includes:

[0063] Step S1: design a basic segment b=[1 -1-1 1 1 -1-1 -1 1] with a length of 8;

[0064] Step S2: Design a top-level sequence of length 80 The sequence can be designed into 8 types, namely m = 0, 1…7;

[0065] Step S3: According to the designed basic segment and the given top-level sequence, the obtained pilot symbol sequence is:

[0066] Where b is the basic fragment.

[0067] As shown in Table 2, the information indicated by different pilot symbol sequences in this embodiment may carry the following information:

[0068]

[0069]

[0070] Table 2

[0071] In the present application, the pilot symbol sequence can effectively improve the utilization efficiency of the pilot symbols by performing a nested design based on the basic fragments, making the signal estimation more accurate, thereby improving the demodulation performance of the data symbols, and through a reasonable embedding strategy, it can effectively reduce the multipath effect and interference from other channels, reduce the complexity of sequence detection, and improve the flexibility and adaptability of the system.

[0072] Preferably, a baseband composite algorithm is also used to represent the baseband signal, wherein the baseband composite algorithm formula is:

[0073]

[0074] c i =c i+Nc =0,i=0,1,…L GP -1,

[0075]

[0076] Among them, β (d) is the power factor of the data symbol; β (p) is the power factor of the pilot symbol; N S is the number of valid symbols; N C is the number of effective chips; L GP is the length of the guard interval in chips; m is the pilot symbol sequence number, m = 0, 1…M-1, M is the number of pilot symbol sequences; i is the valid chip number; d j is the jth valid data symbol; is the jth pilot symbol in the pilot symbol sequence; is the i′th chip in the spreading sequence of the data symbol; is the i′th chip in the spreading sequence of the pilot symbol; c i =c i+Nc =0,i=0,1,…L GP -1 means that the guard interval signals at both ends are filled with 0; Indicates that the guard interval at the left end is 0; Indicates that the guard interval at the right end is 0.

[0077] In summary, compared with the prior art, the present invention can compromise the peak-to-average ratio problem of the signal and the real-time transmission of pilot symbols; and construct a feasible communication system in a very simple way, which is particularly suitable for low-speed narrowband transmission systems; at the same time, the nested design of the spread spectrum symbol sequence is also conducive to simplifying the complexity of sequence detection, and carrying simple control information through the spread spectrum symbol sequence can effectively simplify signaling, improve transmission efficiency, and increase system reliability.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A waveform system of a single-carrier wireless communication system based on micro-spread spectrum, characterized in that: In the waveform system, CDMA and non-CDMA mechanisms are integrated by micro-spread spectrum to obtain a baseband signal, wherein the baseband signal includes a plurality of burst waveform signals; The waveform system includes modulating a burst waveform signal, the burst waveform signal includes a data part, a pilot part and a guard interval part, the pilot part and the data part are combined by superposition, and then the guard interval part is respectively connected to both ends of the combined pilot part and the data part, so as to obtain a modulated burst waveform signal, and finally generate a baseband signal according to the modulated burst waveform signal; And when the pilot part and the data part are combined by superposition, the data symbols and pilot symbols are spread using their own basic spreading codes to form corresponding data code chips and pilot code chips, and then the obtained data code chips and pilot code chips are combined according to a preset power ratio.

2. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 1, characterized in that: Under the condition of a given signal-to-noise ratio snr, the optimal power ratio is obtained through simulation according to the principle of optimal performance; under the condition of a given signal-to-noise ratio snr and a processing gain N of channel estimation, the power ratio is calculated according to the principle of maximum demodulation signal-to-noise ratio; under a given application scenario, the reference signal-to-noise ratio and the processing gain of channel estimation are determined according to a typical scenario of the network, and the power ratio is obtained by simulation or deduction.

3. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 2, characterized in that: The preset power ratio is β (d) / β (p) , where β (d) is the power factor of the data symbol, β (p) is the power factor of the pilot symbol, and the power ratio is a floating point number.

4. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 3, characterized in that: The number of data chips and pilot chips = the number of symbols × spreading factor SF.

5. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 4, characterized in that: It also includes using a baseband composite algorithm to represent the baseband signal, wherein the baseband composite algorithm formula is: c i =c i+Nc =0,i=0,1,…L GP -1, Among them, β (d) is the power factor of the data symbol; β (p) is the power factor of the pilot symbol; N S is the number of valid symbols; N C is the number of effective chips; L GP is the length of the guard interval in chips; m is the pilot symbol sequence number, m = 0, 1…M-1, M is the number of pilot symbol sequences; i is the valid chip number; d j is the jth valid data symbol; is the jth pilot symbol in the pilot symbol sequence; f i′ (d) is the i′th chip in the spreading sequence of the data symbol; f i′ (p) is the i′th chip in the spreading sequence of the pilot symbol; c i =c i+Nc =0,i=0,1,…L GP -1 means that the guard interval signals at both ends are filled with 0; Indicates that the guard interval at the left end is 0; Indicates that the guard interval at the right end is 0.

6. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 5, characterized in that: The data part is further divided into control information and service information, wherein the control information is used to guide the configuration of the service information and other control information; wherein the configuration of the control information in the data part is determined by the pilot symbol sequence in the pilot part.

7. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to claim 6, characterized in that: In the pilot symbol sequence, a nested design is performed based on a basic segment of a baseband signal, so that different pilot symbol sequences carry different control information, wherein the nested design includes: S1: Design the length of a basic segment, where the basic segment is composed of a basic spreading code; S2: Design top-level sequences The length and type of, where m is the pilot symbol sequence number, and n is the length number of the top sequence; S3: Obtain different pilot symbol sequences according to the designed basic segments and top-level sequences, wherein the pilot symbol sequences are: Where b is the basic fragment.

8. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to any one of claims 1 to 7, characterized in that: The length of the interval protection portion is ≥0.

9. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to any one of claims 1 to 7, characterized in that: The number of the basic spreading codes is two, one for the pilot part and one for the data part.

10. The waveform system of a single-carrier wireless communication system based on micro-spread spectrum according to any one of claims 1 to 7, characterized in that: In the pilot part, the pilot signal is modulated using a fixed modulation method.

Images