CN-121984819-A - Symbol transmission waveform processing method and system based on Bezier curve

CN121984819ACN 121984819 ACN121984819 ACN 121984819ACN-121984819-A

Abstract

The application discloses a Bezier curve-based code element transmission waveform processing method and system, which comprises the steps of generating a Bezier curve based on a group of preset control point sets, defining ordinate sample values of the Bezier curve as code element transmission waveforms, constructing a transmission message sequentially comprising a synchronous head, an information head and a data section, wherein the information head is used for storing coordinate information of the control point sets for generating the Bezier curve, modulating the transmission message and sending the transmission message to a receiving end, receiving and demodulating code element transmission waveform signals, analyzing the coordinate information from the information head of the transmission message, restoring the Bezier curve and corresponding code element transmission waveforms by utilizing the analyzed coordinate information, sampling the signals of the received data section, positioning the initial time point of each code element waveform according to a minimum difference criterion, and resampling and demodulating the data section signals based on the positioned initial time point to obtain original data.

Inventors

ZOU NING
ZHOU CHEN
SUN ZHENCHAO
CUI WEI
PENG GANG
WU SHAOFENG
LI CHAOYANG
XU ZHEN

Assignees

武汉船舶通信研究所(中国船舶集团有限公司第七二二研究所)

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A method for processing a symbol transmission waveform based on a bezier curve, comprising: generating a Bezier curve based on a group of preset control point sets at a transmitting end, and defining an ordinate sample value of the Bezier curve as a code element transmission waveform; constructing a transmission message sequentially comprising a synchronous head, an information head and a data section, wherein the information head is used for storing coordinate information of the control point set required by generating the Bezier curve; Receiving and demodulating the code element transmission waveform signal at a receiving end, and analyzing the coordinate information of the control point set from an information head of a transmission message; Restoring a Bezier curve used by a transmitting end and a corresponding code element transmission waveform by utilizing the analyzed coordinate information; In the received data segment sampling signal, the reduced code element transmission waveform is translated, the difference value between the reduced code element transmission waveform and the received sample value is calculated, and the starting time point of each code element waveform is positioned according to the minimum difference value criterion; resampling the data segment signal based on the located starting point in time, and demodulating the original data from the resampled signal.
2. The method for processing a transmission waveform of a symbol based on a bezier curve according to claim 1, wherein the information header and the data segment adopt the same modulation scheme, and a transmission rate of the information header is lower than a transmission rate of the data segment.
3. The method of processing a symbol transmission waveform based on a bezier curve according to claim 1, wherein the step of shifting the restored symbol transmission waveform and calculating a difference between the restored symbol transmission waveform and the received sample value, and locating a start time point of each symbol waveform according to a minimum difference criterion comprises: shifting the restored code element transmission waveform in a target time interval determined by the moment of the sampling point; Calculating the sum of squares of the difference between the restored code element transmission waveform and the received sample value at different translation positions; and determining the position corresponding to the minimum square sum as the starting time point.
4. The method for processing a symbol transmission waveform based on a bezier curve according to claim 1, wherein generating the bezier curve based on a set of predetermined control points at the transmitting end, defining the ordinate samples of the bezier curve as the symbol transmission waveform, comprises: the control point set contains control points of target number; Generating the Bezier curve by adopting control points with the number of targets and axisymmetric distribution; And forming the code element transmission waveform according to the ordinate sample value of the Bezier curve, wherein the abscissa of the Bezier curve carries out equidistant value taking according to the sampling rate of a communication system.
5. The method for processing a symbol transmission waveform based on a bezier curve according to claim 4, wherein said generating the bezier curve using the control points of the target number distributed in an axisymmetric manner comprises: Substituting the control point set into a Bernstein polynomial to generate the Bezier curve; And the code element transmission waveform generated by the Bezier curve presents a raised cosine roll-off shape.
6. The method for processing a symbol transmission waveform based on a bezier curve as claimed in claim 4, wherein after said forming said symbol transmission waveform from ordinate samples of said bezier curve, said method further comprises: And determining the extremum of the code element transmission waveform, and determining the extremum of the code element transmission waveform as a target sampling point.
7. The method of processing a symbol transmission waveform based on a bezier curve according to claim 1, wherein resampling the data segment signal based on the located start time point, demodulating the original data from the resampled signal comprises: Synchronous correction is carried out on the received data segment sampling signals by utilizing the positioned starting time point, and sampling deviation between a transmitting end and a receiving end is eliminated; resampling the corrected signal to restore a symbol sequence without deviation; the transmitted original data is demodulated from the resampled symbol sequence.
8. A symbol transmission waveform processing system based on bezier curves, comprising a transmitting end and a receiving end, characterized in that: The transmitting end is used for generating a Bezier curve based on a group of preset control point sets, defining the ordinate sample value of the Bezier curve as a code element transmission waveform, constructing a transmission message sequentially comprising a synchronous head, an information head and a data section, wherein the information head is used for storing the coordinate information of the control point sets required by generating the Bezier curve; The receiving end is used for receiving and demodulating code element transmission waveform signals, analyzing the coordinate information of the control point set from an information head of a transmission message, restoring a Bezier curve and a corresponding code element transmission waveform used by the sending end by utilizing the analyzed coordinate information, calculating a difference value between the restored code element transmission waveform and a received sample value in a received data segment sampling signal by translating the restored code element transmission waveform, positioning a starting time point of each code element waveform according to a minimum difference value criterion, resampling the data segment signal based on the positioned starting time point, and demodulating original data from the resampled signal.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program when run performs the method of any one of claims 1 to 7.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of claims 1 to 7 by means of the computer program.

Description

Symbol transmission waveform processing method and system based on Bezier curve Technical Field The present application relates to the field of communications, and in particular, to a method and a system for processing a symbol transmission waveform based on a bezier curve. Background Orthogonal time-frequency space (Orthogonal Time Frequency Space, OTFS) modulation is an emerging modulation technique, which can obtain higher delay-doppler gain, and has obvious advantages in resisting doppler frequency offset in a high-speed moving scene, and is considered as a key technology with great potential in a sixth generation mobile communication (6G) system in the future. For example, in a high-speed mobile scene of 500km/h using a MIMO system, OTFS modulation can obtain larger channel capacity, and serious limitation of Doppler frequency offset on communication performance when OFDM modulation is used in 4G and 5G systems is effectively overcome. However, the performance of OTFS modulation systems is in practice susceptible to severe effects of sampling bias between the transmitting and receiving ends. Such sampling bias can destroy the orthogonality of the OTFS signals, which in turn leads to degradation of system performance. Currently, the dominant solution to this problem is to use polynomial function interpolation in combination with resampling techniques. Although the method can alleviate the orthogonality damage caused by sampling deviation to a certain extent, the inherent defects limit the further improvement of the performance, firstly, unavoidable differences exist between the interpolated curve and the original code element transmission waveform, so that the waveform shape cannot be accurately restored, and secondly, in the actual noisy transmission channel, the polynomial interpolation-based method can introduce additional distortion, so that the waveform distortion restored in a noisy environment is more serious, and the improvement of the overall performance of the system is restricted. Therefore, there is an urgent need in the art for a technical solution that can more accurately restore the symbol transmission waveform and effectively combat noise interference, so as to solve the problem of performance degradation of the OTFS system caused by sampling deviation. Disclosure of Invention Aiming at least one defect or improvement requirement of the prior art, the invention provides a symbol transmission waveform processing method and a system based on a Bezier curve, solves the problem of system performance deterioration caused by sampling deviation of a transmitting end and a receiving end, and can restore an original symbol transmission waveform more completely and accurately, thereby effectively correcting the sampling deviation, showing better robustness in a noise environment and remarkably reducing phase error of signal processing of the receiving end. According to a first aspect of the present invention, there is provided a method for processing a symbol transmission waveform based on a bezier curve, the method comprising generating a bezier curve based on a set of predetermined control points at a transmitting end, defining a vertical coordinate sample of the bezier curve as a symbol transmission waveform, constructing a transmission packet sequentially including a synchronization header, an information header and a data segment, the information header being used to store coordinate information of the set of control points required to generate the bezier curve, modulating and transmitting the transmission packet including the information header to a receiving end, receiving and demodulating a symbol transmission waveform signal at the receiving end, parsing the coordinate information of the set of control points from the information header of the transmission packet, restoring the bezier curve and a corresponding symbol transmission waveform used at the transmitting end using the parsed coordinate information, positioning a start time point of each symbol waveform according to a minimum difference criterion by translating the restored symbol transmission waveform and calculating a difference between the restored symbol transmission waveform and the received sample, and re-sampling data from the original data segment based on the start time point after positioning. In an exemplary embodiment, the information header and the data segment adopt the same modulation mode, and the transmission rate of the information header is lower than the transmission rate of the data segment. In an exemplary embodiment, the shifting the restored symbol transmission waveform and calculating the difference between the restored symbol transmission waveform and the received sample value, and locating the start time point of each symbol waveform according to the minimum difference criterion comprises shifting the restored symbol transmission waveform within a target time interval determined by the sampling point mom