A group modulation and demodulation method and device for combating high-frequency phase noise

Abstract

The present invention discloses a packet modulation and demodulation method and device for combating high-frequency phase noise. On the transmitter side, a symbol alphabet is generated according to the modulation orders of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, and a bit sequence is symbol-mapped. The amplitude of ASK and the phase of PSK are then combined with the power sum and phase sum of Stokes sphere modulation to obtain a packet modulation symbol block. On the receiver side, the power sum of the packet modulation symbol block is used to independently demodulate the ASK modulation information. After normalizing the symbol block power to remove the ASK modulation information, the Stokes sphere modulation and PSK modulation information of the symbol block are jointly demodulated. Finally, the transmitted bit sequence information is obtained according to the transmitter modulation combination. The present invention can effectively combat the influence of phase noise on signal distortion in high-frequency communication systems, significantly improving the spectrum efficiency and high-performance information transmission capabilities of high-frequency communication systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of nonlinear wireless communication, and relates to a group modulation and demodulation method and device for combating high-frequency phase noise. Background Art

[0002] In 5G and 6G communications, to achieve greater capacity and higher communication rates, systems must operate in higher frequency bands, such as millimeter-wave and terahertz frequencies. As frequency increases, the non-idealities of communication system hardware become more pronounced in these high-frequency bands. In particular, phase noise generated by oscillators and mixers becomes increasingly significant in impacting system performance as operating frequency increases. On the one hand, phase noise distorts the received signal constellation of the modulated signal, leading to inter-symbol interference and increased bit error rates. On the other hand, phase noise reduces spectral purity and generates spectrum leakage, increasing out-of-band interference. This limits the application of high-frequency and wide-bandwidth technologies, making it impossible to support higher-order modulation schemes and dense spectrum reuse, and reducing the reliability and performance of high-frequency communication systems. As carrier frequencies rise to millimeter-wave and terahertz frequencies, even minor phase instabilities can lead to significant performance losses, necessitating robust phase noise suppression and mitigation strategies.

[0003] To combat the interference of phase noise on signal distortion, pilot-based phase noise estimation and compensation techniques, as well as modulation and demodulation techniques based on circular quadrature amplitude modulation (QAM) and spiral, have been proposed. However, due to the inherent randomness of phase noise, which is mainly affected by changes in RF devices, and the independence of changes in the transmitted signal and phase noise, pilot-based phase noise estimation and compensation techniques can only roughly estimate and compensate for phase noise, making it difficult to combat the random variations in phase noise. In the millimeter wave and terahertz frequency bands, the presence of phase noise also limits the use of high-order modulation schemes, thereby affecting system capacity and performance. By designing modulation and demodulation technologies for transmitting and receiving signals, the ability of transmitted signals to combat phase noise variations can be enhanced, but existing modulation and demodulation technology solutions are difficult to adapt to the performance of high-order modulation and demodulation in high-frequency communication systems. Summary of the Invention

[0004] Purpose of the invention: In response to the problems in the prior art, the present invention aims to provide a packet modulation and demodulation method and device for combating high-frequency phase noise, thereby enhancing the ability of the modulation symbol phase term to combat phase noise at the same spectral efficiency, and further improving the reliability and high-performance transmission capability of high-frequency wireless communication systems.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a packet modulation and demodulation method for combating high-frequency phase noise. By utilizing the powerful phase noise combating capability of Stokes sphere modulation, which transmits information between two adjacent sub-symbols, Phase Shift Keying (PSK) modulation is introduced to constrain the phase sum of the Stokes sphere modulation to transmit partial information in order to compensate for spectral efficiency. However, when the PSK modulation order increases, the modulation scheme's ability to combat phase noise decreases significantly. Therefore, Amplitude Shift Keying (ASK) modulation is further introduced to constrain the power sum of the Stokes sphere modulation, thereby obtaining a flexible packet modulation and demodulation method. The packet modulation and demodulation method mainly includes the following steps:

[0007] When transmitting a bit sequence on the transmitter side, a symbol alphabet is generated according to the modulation order of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, and the bit sequence is symbol-mapped. The amplitude of ASK and the phase of PSK are then combined with the power sum and phase sum of Stokes sphere modulation to obtain a block of grouped modulation symbols.

[0008] After receiving the grouped modulation symbol block at the receiver side, the ASK modulation information is independently demodulated using the grouped modulation symbol block power and normalized to remove the ASK modulation information. The Stokes sphere modulation and PSK modulation information of the symbol block are then jointly demodulated. Finally, the transmitted bit sequence information is obtained according to the transmitter modulation combination.

[0009] Furthermore, the combined modulation obtains a block of group modulation symbols represented as:

[0010] ;

[0011] in, and They represent adjacent sub-symbols in the group modulation symbol block, E represents the amplitude information of the ASK modulation symbol, and They represent the pitch angle and azimuth angle information of the Stokes sphere modulation symbol on the Stokes three-dimensional sphere, and are the amplitude terms of the two sub-symbols of Stokes sphere modulation, and are the phase terms of the two sub-symbols of Stokes spherical modulation, Represented as the angle information of the PSK modulation symbol, is the phase information of the PSK modulation symbol.

[0012] Furthermore, before performing symbol mapping, it also includes: determining the modulation information order on the transmitter side, constructing a group modulation combination scheme of ASK modulation, PSK modulation and Stokes sphere modulation, and obtaining a symbol alphabet for different modulation methods; based on the obtained modulation orders of the different modulation method combinations, allocating bit information to the transmitted bit sequence according to the modulation order.

[0013] Furthermore, according to the modulation order on the transmitter side, the scheme of the Stokes sphere modulation order that is the same as the transmission modulation order is first selected, and the modulation order combination of PSK and ASK whose minimum Euclidean distance (MED) of the PSK modulation symbol is greater than and closest to the Stokes sphere modulation symbol MED is selected while ensuring that the transmission modulation order has the same spectral efficiency as the orthogonal amplitude modulation QAM. M and ASK modulation order M a , PSK modulation order M p , Stokes sphere modulation order M s The corresponding relationship is expressed as: ; Then the respective symbol alphabets are obtained from the set of all modulation symbols corresponding to the modulation order.

[0014] Furthermore, in the method of utilizing the power of grouped modulation symbol blocks and independently demodulating ASK modulation information, adjacent received symbols in the modulation symbol sequence are grouped into a symbol block, which are processed in sequence to obtain a received symbol block sequence, the power and size of each symbol block are calculated, and maximum likelihood probability demodulation is performed based on the ASK modulation symbol alphabet information to achieve independent demodulation of ASK modulation information.

[0015] Furthermore, in the joint demodulation of the Stokes sphere modulation and PSK modulation information of the symbol block, the information in the power-normalized grouped modulation symbol block is jointly demodulated according to a joint symbol alphabet of Stokes sphere modulation symbols and PSK modulation symbols.

[0016] Furthermore, on the basis of determining the Stokes sphere modulation order and the PSK modulation order, the modulation symbols in their respective symbol alphabets are combined in pairs to obtain a joint symbol alphabet of Stokes sphere modulation symbols and PSK modulation symbols; according to the joint symbol alphabet, the power-normalized grouped modulation symbol blocks are subjected to maximum likelihood probability demodulation to realize joint demodulation of Stokes sphere modulation information and PSK modulation information.

[0017] In a second aspect, the present invention provides a packet modulation and demodulation device for combating high-frequency phase noise, comprising a modulation device and a demodulation device, for implementing the packet modulation and demodulation method for combating high-frequency phase noise described in the first aspect;

[0018] The modulation device is used to generate a symbol alphabet according to the modulation orders of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation when transmitting a bit sequence at the transmitter side, and to perform symbol mapping on the bit sequence, and then to combine the amplitude of ASK and the phase of PSK with the power sum and phase sum of Stokes sphere modulation to obtain a block of grouped modulation symbols;

[0019] The demodulation device is used to independently demodulate the ASK modulation information using the power of the grouped modulation symbol block after receiving the grouped modulation symbol block on the receiver side, and after normalizing the symbol block power to remove the ASK modulation information, jointly demodulate the Stokes sphere modulation and PSK modulation information of the symbol block, and finally obtain the transmitted bit sequence information according to the transmitter modulation combination.

[0020] In a third aspect, the present invention provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps on the transmitter side and / or the steps on the receiver side of the packet modulation and demodulation method for combating high-frequency phase noise described in the first aspect are implemented.

[0021] In a fourth aspect, the present invention provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps on the transmitter side and / or the steps on the receiver side of the packet modulation and demodulation method for combating high-frequency phase noise described in the first aspect.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects: (1) On the transmitter side, the present invention can implement group modulation of multiple modulation methods on the phase terms and amplitude terms of two adjacent symbols, and use ASK modulation to enhance the ability of the phase term to combat phase noise under the same spectrum efficiency. It further improves the ability of the transmitted signal to carry information and enhances spectrum efficiency. (2) On the receiver side, the present invention can achieve a certain communication capacity under strong phase noise interference through independent demodulation of ASK modulation. (3) According to changes in communication scenarios and needs, the present invention can flexibly modify the combination scheme of ASK modulation, PSK modulation, and Stokes sphere modulation to improve the transmission performance of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 4 is an overall flow chart of the method according to an embodiment of the present invention.

[0024] Figure 2 Detailed flowchart of the method according to an embodiment of the present invention.

[0025] Figure 3 Figure 1 shows the constellation diagram of the block modulation symbol alphabet when the transmit modulation order M is 16, and the change in the modulation symbol constellation diagram after being affected by phase noise, according to an embodiment of the present invention. (a) shows the constellation diagram of the block modulation symbol, and (b) shows the change in the constellation diagram of the block modulation symbol after being affected by phase noise.

[0026] Figure 4 2 is a graph showing the variation of the single-sideband power spectrum density of the phase noise with the frequency offset at a carrier frequency of 29.55 GHz used in an embodiment of the present invention.

[0027] Figure 5 Figure 1 compares the symbol error rate of received signals affected by phase noise for different modulation methods in an embodiment of the present invention. (a) shows the comparison result for a modulation order of 16, (b) shows the comparison result for a modulation order of 32, (c) shows the comparison result for a modulation order of 64, and (d) shows the comparison result for a modulation order of 128.

[0028] Figure 6 Figure 1 compares the communication capacity of different modulation methods affected by phase noise in an embodiment of the present invention. (a) shows the comparison result for a modulation order of 16, (b) shows the comparison result for a modulation order of 32, (c) shows the comparison result for a modulation order of 64, and (d) shows the comparison result for a modulation order of 128. DETAILED DESCRIPTION

[0029] In order to better understand the purpose, scheme and effect of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, an embodiment of the present invention discloses a group modulation and demodulation method for combating high-frequency phase noise. When a bit sequence is transmitted on the transmitter side, a symbol alphabet is generated according to the modulation orders of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, and the bit sequence is symbol mapped. Then, the amplitude of ASK and the phase of PSK are combined with the power sum and phase sum of Stokes sphere modulation to obtain a group modulation symbol block. After the group modulation symbol block is received on the receiver side, the ASK modulation information is independently demodulated using the power sum of the group modulation symbol block, and after the symbol block power is normalized to remove the ASK modulation information, the Stokes sphere modulation and PSK modulation information of the symbol block are jointly demodulated. Finally, the transmitted bit sequence information is obtained according to the transmitter modulation combination.

[0031] The present invention can construct a group modulation symbol block by designing a flexible combination scheme of ASK modulation, PSK modulation, and Stokes sphere modulation on the transmitter side according to the change of phase noise. On the receiver side, independent demodulation of ASK modulation and joint demodulation of PSK modulation and Stokes sphere modulation information can be performed to effectively combat the influence of phase noise of high-frequency communication systems on signal distortion, achieve high-speed and high-performance communication under strong phase noise interference, and significantly improve the spectrum efficiency and information transmission capability of high-frequency communication systems.

[0032] Specifically, in this embodiment, the system flow of the group modulation and demodulation method for combating high-frequency phase noise is as follows: Figure 2 As shown, the specific steps include:

[0033] Step 1: Determine the modulation order on the transmitter side and construct the group modulation combination schemes of ASK modulation, PSK modulation, and Stokes sphere modulation as well as their respective symbol alphabets.

[0034] Step 2: Based on the modulation orders of different modulation method combinations obtained in step 1, bit information is allocated to the transmitted bit sequence according to the modulation order.

[0035] Step 3: Based on the bit information allocated in step 2, bits are mapped to symbols according to the symbol alphabets of ASK modulation, PSK modulation, and Stokes sphere modulation.

[0036] Step 4: Based on the symbol information in step 3, the amplitude information of the ASK modulation symbol is combined and modulated as the power and constraint of the Stokes sphere modulation symbol block.

[0037] Step 5: Based on the symbol information in step 3, the phase information of the PSK modulation symbol is combined and modulated as the phase and constraint of the Stokes sphere modulation symbol block.

[0038] Step 6: Construct a block sequence of group modulation symbol blocks based on the group modulation implementing the ASK modulation information, PSK modulation information, and Stokes sphere modulation information in steps 4 and 5.

[0039] Step 7: Based on the block sequence of grouped modulation symbols in step 6, after up-conversion and transmission by the antenna, it passes through the wireless channel to the receiver side and is down-converted to obtain the baseband signal. The pilot information is used to estimate the channel and perform frequency domain equalization to eliminate the interference of channel noise. The instability of the oscillator in the up- and down-conversion process will introduce phase noise.

[0040] Step 8: Based on the processing result of step 7, the power and information of the received group modulation symbol block are solved, and the power and information are demodulated according to the maximum likelihood probability based on MED maximization and the ASK modulation symbol alphabet to obtain the independent demodulation result of the ASK modulation information.

[0041] Step 9: Perform power normalization processing on the grouped modulation symbol block based on the power sum information in step 8.

[0042] Step 10: Based on the normalized group modulation symbol block in step 9, the Stokes sphere modulation and PSK modulation information are jointly demodulated according to the joint symbol alphabet of Stokes sphere modulation and PSK modulation and the calculation method of maximum likelihood probability.

[0043] Step 11: Based on the demodulation results of steps 8 and 10, the demodulated information is combined according to the bit allocation scheme in step 2 to restore the transmitted bit information.

[0044] In step 1, based on the modulation order on the transmitter side, in order to combat phase noise, the decision threshold for demodulating the phase term in the packet modulation symbol block is increased as much as possible. First, a Stokes sphere modulation order scheme with the same modulation order as the transmit modulation order is selected. While ensuring that the transmit modulation order has the same spectral efficiency as quadrature amplitude modulation (QAM), a modulation order combination of PSK and ASK is selected in which the MED of the PSK modulation symbol is greater than and closest to the MED of the Stokes sphere modulation symbol. This allows packet modulation to combat phase noise. The corresponding relationship between the modulation order of the information transmitted on the transmitter side and the ASK modulation order, PSK modulation order, and Stokes sphere modulation order is expressed as: Then the respective symbol alphabet is obtained from the set of all modulation symbols of the corresponding modulation order.

[0045] In step 2, based on the group modulation combination scheme of step 1, the bit sequence to be transmitted is allocated in the order of Stokes sphere modulation, PSK modulation, and ASK modulation.

[0046] In step 3, according to the joint combined modulation scheme in step 1, modulation symbol alphabets corresponding to modulation orders of different modulation methods are obtained respectively, and symbol mapping is implemented according to the bits and modulation orders allocated in step 2.

[0047] In step 4, the ASK modulation symbol is modulated to obtain the corresponding amplitude change. By taking advantage of the fact that the power sum of the Stokes sphere modulation symbol block is 1, the power sum is adjusted to be the same as the amplitude change of the ASK modulation symbol, and a combination of Stokes sphere modulation information and ASK modulation information can be obtained. One modulation symbol block can be expressed as:

[0048] ;

[0049] in, and They represent adjacent sub-symbols in the symbol block, E represents the amplitude information of the ASK modulation symbol, and They represent the pitch angle and azimuth information of the Stokes spherical modulation symbol on the Stokes three-dimensional sphere. The Stokes spherical modulation is adjusted by and The combination of carries the modulation information, and are the amplitude terms of the two sub-symbols of Stokes sphere modulation, and They are the phase terms of the two sub-symbols of Stokes sphere modulation.

[0050] In step 5, based on the combined modulation symbol block of Stokes sphere modulation information and ASK modulation information obtained in step 4, the angle of the complex signal of the PSK modulation symbol on the constellation diagram is calculated to obtain the corresponding phase change information. Using the fact that the phase sum of the Stokes sphere modulation information is 0, and following the principle that the phase change of the PSK modulation symbol is the same as the phase sum change, a sequence of grouped modulation symbol blocks of Stokes sphere modulation information, ASK modulation information, and PSK modulation information can be obtained. One of the grouped modulation symbol blocks can be expressed as:

[0051] ;

[0052] in, and Respectively represent adjacent sub-symbols in the grouped modulation symbol block, Represented as the angle information of the PSK modulation symbol. is the phase information of the PSK modulation symbol.

[0053] In step 6, a time-domain block modulation symbol sequence is obtained according to the processing operations of steps 4 and 5.

[0054] In step 7, the baseband signal undergoes pulse shaping and up-conversion, and is then transmitted through a power amplifier. It then reaches the receiver via a wireless channel. It then undergoes low-noise amplification and down-conversion processing to obtain a modulation symbol sequence that is affected by channel interference and oscillator phase noise. The pilot sequence is used to estimate the channel noise, and frequency domain equalization is used to eliminate the channel interference on the transmitted symbols, resulting in a modulation symbol sequence after eliminating channel interference. The received symbol sequence is then expressed as:

[0055] ;

[0056] in, Denote the received modulation symbol sequence, Denoted as the transmitted modulation symbol sequence, is the phase noise sequence generated by the local oscillator, is represented as the channel interference term.

[0057] In step 8, adjacent received symbols in the modulation symbol sequence obtained in step 7 are grouped into a symbol block, which is processed sequentially to obtain a received symbol block sequence. The power and size of each symbol block are calculated, and maximum likelihood probability demodulation is performed based on the ASK modulation symbol alphabet information to achieve independent demodulation of the ASK modulation information. The power sum of one received symbol block can be expressed as:

[0058] ;

[0059] in, and are two adjacent received sub-symbols, Indicates the amplitude of the received ASK modulation symbol.

[0060] In step 9, power normalization is performed on the received block of packet modulation symbols. The power normalization of a received symbol block can be expressed as:

[0061] .

[0062] In step 10, the information in the power-normalized block of modulated symbols is jointly demodulated based on a joint symbol alphabet of Stokes sphere modulation symbols and PSK modulation symbols. Based on the determination of the Stokes sphere modulation order and the PSK modulation order, the modulation symbols in their respective symbol alphabets are combined pairwise to obtain a joint symbol alphabet of Stokes sphere modulation symbols and PSK modulation symbols. Maximum likelihood demodulation is performed on the power-normalized block of modulated symbols based on the joint symbol alphabet to achieve joint demodulation of the Stokes sphere modulation information and the PSK modulation information.

[0063] In step 11, the bit information of the independently demodulated ASK modulation information and the jointly demodulated Stokes sphere modulation information and PSK modulation information are combined according to the bit allocation order in the corresponding modulation combination scheme to restore the transmitted bit sequence information.

[0064] In order to verify the performance of the packet modulation and demodulation method for combating high-frequency phase noise in this embodiment, the corresponding communication system parameters are configured to carry out simulation experiments. According to the demodulation performance based on the maximum likelihood probability and the ability to combat phase noise of different modulation orders, the combination schemes of different modulation orders under packet modulation in Table 1 are given.

[0065] Table 1 Various modulation combinations under group modulation

[0066] Modulation order Stokes PSK ASK 16 16 8 2 32 32 8 4 64 64 16 4 128 128 16 8

[0067] Exemplarily, the combination scheme given in Table 1 is used to design the single-carrier communication system configuration parameters of this embodiment in Table 2.

[0068] Table 2 Parameter configuration

[0069] Carrier frequency Signal bandwidth Sampling frequency Channel 29.55GHz 80MHz 320MHz AWGN

[0070] Based on the parameter configuration information in Table 2, the implementation effect of a group modulation and demodulation method for combating high-frequency phase noise disclosed in an embodiment of the present invention is described in detail below. Figure 3 (a) is the constellation diagram of the group modulation symbols when the transmit modulation order M is 16, where the amplitude of the ASK modulation symbol is 1 or 2, which corresponds to the joint symbol constellation diagram of Stokes sphere modulation and PSK modulation.

[0071] In this embodiment, the multi-pole and multi-zero phase noise model of a 29.55 GHz carrier frequency measured in the 3GPP document is selected as the phase noise model for the simulation experiment. Figure 4 The power spectrum density of the phase noise model with a carrier frequency of 29.55 GHz varies with frequency offset. In the simulation experiment, by adding simulated time-domain phase noise at the transmitter, the received signal will have a phase offset. When the phase noise is greater than the phase resolution threshold, a demodulation error will occur. Affected by the phase noise, Figure 3 As can be seen in (b), phase noise will make Figure 3 The modulation symbols in (a) are randomly rotated in the angle domain, which makes the demodulation decision of a single symbol prone to errors. However, by using the grouped modulation symbol block of the present invention, the information transmission is more reliable using two symbols and has a stronger ability to resist phase noise.

[0072] Figure 5 The symbol error rates of received signals of different modulation methods affected by phase noise are compared. From the comparison results, it can be seen that the packet modulation and demodulation method of the present invention for combating high-frequency phase noise is superior to the existing modulation and demodulation methods at higher modulation orders such as 16, 32, 64, and 128. In particular, as the modulation order increases, other modulation methods basically cannot achieve normal communication transmission, and an error floor with a higher symbol error rate will appear. In contrast, the packet modulation and demodulation method of the present invention can achieve a lower symbol error rate at different modulation orders, and has a stronger ability to combat phase noise at higher modulation orders, and can ensure high-speed and high-performance transmission of high-frequency communication systems under a certain signal-to-noise ratio.

[0073] Figure 6The figure shows the change in communication capacity when the carrier frequency changes with different modulation methods. The signal-to-noise ratio is set to 20dB. The change in communication capacity is represented by the amount of information that can be transmitted per unit time and per unit bandwidth, which is the information rate. Since the phase noise and carrier frequency change are proportional, the phase noise gradually increases with the increase of carrier frequency, and the distortion effect on the signal also increases. Based on the phase noise model of the measured 29.55 GHz carrier frequency, the phase noise changes at different carrier frequencies can be calculated, and the following can be obtained: Figure 6 The curve of the achievable information rate index change of different modulation methods as the carrier frequency changes. Figure 6 From the comparison results of different modulation orders, it can be found that the method of the present invention is superior to other modulation methods. It can achieve a higher achievable information rate under the influence of strong phase noise, has a stronger ability to resist phase noise, and further improves the information capacity and transmission performance of high-frequency wireless communication systems.

[0074] Based on the same inventive concept, an embodiment of the present invention discloses a packet modulation and demodulation device for combating high-frequency phase noise, comprising a modulation device and a demodulation device, for implementing the aforementioned packet modulation and demodulation method for combating high-frequency phase noise. The modulation device is configured to, when transmitting a bit sequence on the transmitter side, generate a symbol alphabet according to the modulation orders of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, and perform symbol mapping on the bit sequence. The amplitude of the ASK and the phase of the PSK are then combined with the power sum and phase sum of the Stokes sphere modulation to obtain a packet modulation symbol block. The demodulation device is configured to, upon receiving the packet modulation symbol block on the receiver side, independently demodulate the ASK modulation information using the power sum of the packet modulation symbol block, normalize the symbol block power to remove the ASK modulation information, and then jointly demodulate the Stokes sphere modulation and PSK modulation information of the symbol block. Finally, the transmitted bit sequence information is obtained according to the transmitter modulation combination.

[0075] An embodiment of the present invention also discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps on the transmitter side and / or the steps on the receiver side of the aforementioned packet modulation and demodulation method for combating high-frequency phase noise are implemented.

[0076] An embodiment of the present invention further discloses a computer program product, comprising a computer program, which, when executed by a processor, implements the transmitter-side steps and / or receiver-side steps in the aforementioned packet modulation and demodulation method for combating high-frequency phase noise.

[0077] Anything not described in detail in the present invention is well known to those skilled in the art.

[0078] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A packet modulation and demodulation method for combating high-frequency phase noise, characterized in that: The following steps are involved: On the transmitter side, the modulation orders of different modulation methods are determined, and a group modulation combination scheme of ASK modulation, PSK modulation, and Stokes sphere modulation is constructed; Based on the modulation order and group modulation combination scheme, the bit sequence to be transmitted is allocated in the order of Stokes sphere modulation, PSK modulation, and ASK modulation; When transmitting a bit sequence on the transmitter side, a symbol alphabet is generated according to the modulation order of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, and the bit sequence is symbol-mapped. The amplitude of ASK and the phase of PSK are then combined with the power sum and phase sum of Stokes sphere modulation to obtain a block of grouped modulation symbols. After receiving the block modulation symbol block, the receiver side uses the block modulation symbol power and the ASK modulation information to independently demodulate. After normalizing the symbol block power to remove the ASK modulation information, the Stokes sphere modulation and PSK modulation information of the symbol block are jointly demodulated. Finally, they are combined according to the bit allocation order in the corresponding modulation combination scheme on the transmitter side to obtain the transmitted bit sequence information. The combined modulation results in a group modulation symbol block represented as: ； in, and They represent adjacent sub-symbols in the group modulation symbol block, E represents the amplitude information of the ASK modulation symbol, and They represent the pitch angle and azimuth angle information of the Stokes sphere modulation symbol on the Stokes three-dimensional sphere, and are the amplitude terms of the two sub-symbols of Stokes sphere modulation, and are the phase terms of the two sub-symbols of Stokes spherical modulation, Represented as the angle information of the PSK modulation symbol, is the phase information of the PSK modulation symbol.

2. The method for group modulation and demodulation against high frequency phase noise according to claim 1, characterized in that: According to the modulation order on the transmitter side, the scheme of Stokes sphere modulation order that is the same as the transmission modulation order is first selected. Then, under the premise of ensuring that the transmission modulation order has the same spectrum efficiency as the orthogonal amplitude modulation QAM, the modulation order combination of PSK and ASK whose minimum Euclidean distance MED of the PSK modulation symbol is greater than and closest to the Stokes sphere modulation symbol MED is selected. The modulation order on the transmitter side is M and ASK modulation order M a , PSK modulation order M p , Stokes sphere modulation order M s The corresponding relationship is expressed as: ; Then the respective symbol alphabets are obtained from the set of all modulation symbols corresponding to the modulation order.

3. The method for group modulation and demodulation against high-frequency phase noise according to claim 1, wherein: In the method of utilizing the power of grouped modulation symbol blocks and independently demodulating ASK modulation information, adjacent received symbols in the modulation symbol sequence are combined into a symbol block, which is processed in sequence to obtain a received symbol block sequence. The power and size of each symbol block are calculated, and maximum likelihood probability demodulation is performed according to the ASK modulation symbol alphabet to achieve independent demodulation of ASK modulation information.

4. The method for group modulation and demodulation against high-frequency phase noise according to claim 1, wherein: In the joint demodulation of the Stokes sphere modulation and PSK modulation information of the symbol block, the information in the power-normalized grouped modulation symbol block is jointly demodulated according to a joint symbol alphabet of the Stokes sphere modulation symbols and the PSK modulation symbols.

5. The method for group modulation and demodulation against high frequency phase noise according to claim 4, characterized in that: On the basis of determining the Stokes sphere modulation order and the PSK modulation order, the modulation symbols in their respective symbol alphabets are combined in pairs to obtain a joint symbol alphabet of Stokes sphere modulation symbols and PSK modulation symbols; according to the joint symbol alphabet, the power-normalized grouped modulation symbol blocks are demodulated with maximum likelihood probability to realize joint demodulation of Stokes sphere modulation information and PSK modulation information.

6. A packet modulation and demodulation device for combating high-frequency phase noise, characterized in that: It comprises a modulation device and a demodulation device, used to implement a group modulation and demodulation method for combating high-frequency phase noise according to any one of claims 1 to 5; The modulation device is configured to determine, on the transmitter side, the modulation orders of different modulation methods and construct a group modulation combination scheme of ASK modulation, PSK modulation, and Stokes sphere modulation; allocate the bit sequence to be transmitted in the order of Stokes sphere modulation, PSK modulation, and ASK modulation based on the modulation order and the group modulation combination scheme; when transmitting the bit sequence on the transmitter side, generate a symbol alphabet according to the modulation orders of amplitude shift keying (ASK), phase shift keying (PSK), and Stokes sphere modulation, perform symbol mapping on the bit sequence, and then combine the amplitude of ASK and the phase of PSK with the power sum and phase sum of Stokes sphere modulation to obtain a group modulation symbol block; The combined modulation results in a group modulation symbol block represented as: ； in, and They represent adjacent sub-symbols in the group modulation symbol block, E represents the amplitude information of the ASK modulation symbol, and They represent the pitch angle and azimuth angle information of the Stokes sphere modulation symbol on the Stokes three-dimensional sphere, and are the amplitude terms of the two sub-symbols of Stokes sphere modulation, and are the phase terms of the two sub-symbols of Stokes spherical modulation, Represented as the angle information of the PSK modulation symbol, is the phase information of the PSK modulation symbol; The demodulation device is used to independently demodulate the ASK modulation information using the power of the grouped modulation symbol block after receiving the grouped modulation symbol block on the receiver side, normalize the symbol block power to remove the ASK modulation information, and then jointly demodulate the Stokes sphere modulation and PSK modulation information of the symbol block, and finally combine them according to the bit allocation order in the corresponding modulation combination scheme on the transmitter side to obtain the transmitted bit sequence information.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the computer program is executed by a processor, the steps on the transmitter side and / or the steps on the receiver side are implemented in the packet modulation and demodulation method for combating high-frequency phase noise according to any one of claims 1 to 5.

8. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps on the transmitter side and / or the steps on the receiver side are implemented in the packet modulation and demodulation method for combating high-frequency phase noise according to any one of claims 1 to 5.

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