CN-122026998-A - Multi-star point wave beam expansion transmission method for inhibiting electric wave interference

CN122026998ACN 122026998 ACN122026998 ACN 122026998ACN-122026998-A

Abstract

A multi-star point wave beam expansion transmission method for restraining electric wave interference belongs to the technical field of wireless communication. The invention solves the problem of unstable signals in the edge coverage area caused by the interference effect of the electric waves in the multi-star coverage scene. The four communication satellites respectively perform different time-frequency domain expansion transformation on the transmitted signals, so that the four communication satellites can transmit incoherent signals with different waveforms loaded with the same information, and the ground user equipment simultaneously receives downlink signals of the four satellites and performs EWFRFT inverse transformation and conventional demodulation on the downlink signals. Different waveforms are formed in the coverage area to improve the signal quality in the edge coverage area, so that severe fluctuation of electromagnetic signals caused by interference effects is effectively restrained, severe interference fading caused by carrier phase differences when ground user equipment receives the signals simultaneously is restrained, and the signal quality of users in the edge coverage area is improved. The method of the invention can be applied to the technical field of wireless communication.

Inventors

SHA XUEJUN
WANG DING
WU WEI
FANG XIAOJIE
SUN YIFEI
DU QIRUI

Assignees

哈尔滨工业大学

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (10)

1. The multi-star point wave beam expansion transmission method for inhibiting electric wave interference is characterized by comprising the following steps: At the transmitting end: step S1, satellite The modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping ; Satellite The modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping ; Satellite The modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping ; Satellite The modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping ; Step S2, satellite Modulation result Grouping, i.e. from the modulation result Starts with the first digit of (1) and modulates the result Is divided into Each data block is provided with a length equal to N, N is a positive integer, each data block is respectively used as one frame of data, and the first frame of data is provided with a second frame of data The frame data is recorded as ; Wherein, the , Respectively the first Frame data The 1 st, 2 nd, N-th data; Satellite Modulation result Grouping, i.e. from the modulation result Starts with the first digit of (1) and modulates the result Is divided into Data blocks with equal lengths; Satellite Modulation result Grouping, i.e. from the modulation result Starts with the first digit of (1) and modulates the result Is divided into Data blocks with equal lengths; Satellite Modulation result Grouping, i.e. from the modulation result Starts with the first digit of (1) and modulates the result Is divided into Data blocks with equal lengths; Step S3, satellite Using a transformation matrix Based on the modulation result The obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame ; Satellite Using a transformation matrix Based on the modulation result The obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame ; Satellite Using a transformation matrix Based on the modulation result The obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame ; Satellite Using a transformation matrix Based on the modulation result The obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame ; The transformation matrix Transformation matrix Transformation matrix Transformation matrix Fourier transform matrix according to spread weighted score The method specifically comprises the following steps: extended weighted score fourier transform matrix The method comprises the following steps: Wherein, the Is of the size of Is used for the matrix of units of (a), Is of the size of Is used for the fourier transform matrix of (a), In order to replace the matrix of the matrix, Is a weighting coefficient; fourier transform matrix for spreading weighted scores Random distribution is carried out on four items of the matrix to determine a transformation matrix Transformation matrix Transformation matrix Transformation matrix ; Step S4, satellite Transform the results at each frame Respectively adding cyclic prefix in front of the frame to obtain conversion result after adding cyclic prefix ; And respectively at Before adding synchronous sequence, and representing each frame conversion result after adding synchronous sequence into a path of serial digital signal , Respectively show the addition of A preceding synchronization sequence; Satellite Transform the results at each frame Respectively adding cyclic prefix in front of the frame to obtain conversion result after adding cyclic prefix ; And respectively at Before adding synchronous sequence, and representing each frame conversion result after adding synchronous sequence into a path of serial digital signal , Respectively show the addition of A preceding synchronization sequence; Satellite Transform the results at each frame Respectively adding cyclic prefix in front of the frame to obtain conversion result after adding cyclic prefix ; And respectively at Before adding synchronous sequence, and representing each frame conversion result after adding synchronous sequence into a path of serial digital signal , Respectively show the addition of A preceding synchronization sequence; Satellite Transform the results at each frame Respectively adding cyclic prefix in front of the frame to obtain conversion result after adding cyclic prefix ; And respectively at Before adding synchronous sequence, and representing each frame conversion result after adding synchronous sequence into a path of serial digital signal , Respectively show the addition of A preceding synchronization sequence; Step S5, satellite Serial digital signal Obtaining an analog modulation signal to be transmitted through a digital-to-analog converter Analog modulation signal After up-conversion treatment, the treated signals are transmitted; Satellite Serial digital signal Obtaining an analog modulation signal to be transmitted through a digital-to-analog converter Analog modulation signal After up-conversion treatment, the treated signals are transmitted; Satellite Serial digital signal Obtaining an analog modulation signal to be transmitted through a digital-to-analog converter Analog modulation signal After up-conversion treatment, the treated signals are transmitted; Satellite Serial digital signal Obtaining an analog modulation signal to be transmitted through a digital-to-analog converter Analog modulation signal After up-conversion treatment, the treated signals are transmitted; At the receiving end: The signals transmitted in the step R1 and the step S5 are transmitted through a downlink channel and then reach the ground user equipment, and a receiver of the ground user equipment receives signals from satellites at the same time 、、 And Is recorded as the received signal of the ground user equipment receiver Will receive the signal Sequentially passing through a low noise amplifier, a down-converter and an analog-to-digital converter to obtain digital samples of the baseband analog signal ; Step R2, the ground user equipment transmits the signal Respectively with satellite 、、 And Performing sliding cross-correlation on the synchronization sequences added in the step S4; Step R3, for the satellites in step R2 、、 And Respectively carrying out timing measurement on the corresponding sliding cross-correlation results; r4, carrying out peak detection on the timing measurement result obtained in the step R3; If satellite 、、 And If the corresponding timing measurement results all detect the correlation peak, the symbol synchronization is considered to be completed, and then the step R5 is executed; Otherwise, the local synchronous sequences are adjusted, a group of four local synchronous sequences are taken down from the local signal memory, and the step R2 is returned; R5, the later correlation peak sample points in the four correlation peaks are the position indexes of symbol synchronization, the ground receiving equipment carries out framing treatment on the received signals according to the position indexes of symbol synchronization, and then respectively deleting the cyclic prefix and the synchronization sequence from the obtained frame signals to obtain frame signals with the cyclic prefix and the synchronization sequence deleted; R6, performing expansion weighted fractional Fourier transform on each data frame obtained in the step R5 respectively, and obtaining a first step Frame data is subjected to expansion weighted fractional Fourier transform to obtain an output signal ; Step R7, the output signal obtained in the step R6 Represented as a serial digital signal , For signals And performing constellation demapping to recover 0 and 1 bit data and obtain demodulated satellite bit data.
2. The multi-satellite spot beam spread transmission method for suppressing interference of electric waves according to claim 1, wherein said weighting coefficients are The method comprises the following steps: Wherein, the Are the phase angles of the weighting coefficients, The base number representing the natural logarithm, Representing imaginary units.
3. The multi-satellite spot beam spread transmission method for suppressing interference of electric waves according to claim 1, wherein said weighting coefficients are The method comprises the following steps: Wherein, the Are the phase angles of the weighting coefficients, The base number representing the natural logarithm, Representing imaginary units.
4. A multi-satellite spot beam spread transmission method for suppressing interference of electric waves as claimed in claim 2 or 3, wherein said transformation matrix Transformation matrix Transformation matrix Transformation matrix The method comprises the following steps of: 。
5. The multi-satellite spot beam spread transmission method according to claim 4, wherein the fourier transform matrix is: Wherein, the Is an intermediate variable.
6. The method for multi-satellite spot beam expansion transmission with interference suppression according to claim 5, wherein said intermediate variable 。
7. The method for spread spectrum transmission of multi-satellite spot beam with interference suppression according to claim 6, wherein the permutation matrix The method comprises the following steps: 。
8. The method for multi-satellite spot beam expansion transmission with interference suppression according to claim 7, wherein the first step of Output signal obtained by frame data through expansion weighted fractional inverse Fourier transform The method comprises the following steps: wherein, the upper corner mark T represents transposition and transformation matrix Is of the size of Is an extended weighted fractional inverse fourier transform matrix of (c), Representing the first obtained in step R5 And data frames.
9. The multi-star point beam spread transmission method for suppressing interference of electric waves according to claim 8, wherein said spread weighted inverse fractional fourier transform matrix is: Wherein, the Is a weighting coefficient.
10. The multi-satellite spot beam spread transmission method for suppressing interference of electric waves according to claim 9, wherein said weighting coefficients are The method comprises the following steps: Wherein, the Representing conjugation.

Description

Multi-star point wave beam expansion transmission method for inhibiting electric wave interference Technical Field The invention belongs to the technical field of wireless communication, and particularly relates to a multi-star point wave beam expansion transmission method for inhibiting electric wave interference. Background In a satellite-ground coverage scene, unprecedented higher requirements are put forward on global continuous, real-time and high-resolution ground information acquisition and service capability, and multi-satellite cooperative ground coverage becomes the leading edge and core development direction of a space information system due to rapid development of on-board processing, inter-satellite high-speed links and advanced cooperative control algorithms. Satellite-ground coverage relates to that a plurality of satellites provide wave spot beams or area coverage for the same point, and the distance between the satellites is far greater than the wavelength of electromagnetic waves, so that an ultra-long baseline multi-beam area coverage scene is formed, and the wave coverage does not conform to a general far-field model. The conventional signal can generate interference effect of electric wave under the scene that a plurality of satellites provide coverage to the same point, and the intensity fluctuation of the electromagnetic field is changed with the phase of the carrier wave, so that the signal in the coverage area is extremely unstable. Disclosure of Invention The invention aims to solve the problem of unstable signals in an edge coverage area due to the electric wave interference effect in a multi-star coverage scene, and provides a multi-star point wave beam expansion transmission method for inhibiting electric wave interference. The invention adopts the technical scheme that the multi-star point wave beam expansion transmission method for restraining the wave interference comprises the following steps: At the transmitting end: step S1, satellite The modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping; SatelliteThe modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping; SatelliteThe modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping; SatelliteThe modulator of (2) carries out digital baseband modulation on 0,1 bit data generated by the information source to obtain a modulation result after constellation mapping; Step S2, satelliteModulation resultGrouping, i.e. from the modulation resultStarts with the first digit of (1) and modulates the resultIs divided intoEach data block is provided with a length equal to N, N is a positive integer, each data block is respectively used as one frame of data, and the first frame of data is provided with a second frame of dataThe frame data is recorded as; Wherein, the ,Respectively the firstFrame dataThe 1 st, 2 nd, N-th data; Satellite Modulation resultGrouping, i.e. from the modulation resultStarts with the first digit of (1) and modulates the resultIs divided intoData blocks with equal lengths; Satellite Modulation resultGrouping, i.e. from the modulation resultStarts with the first digit of (1) and modulates the resultIs divided intoData blocks with equal lengths; Satellite Modulation resultGrouping, i.e. from the modulation resultStarts with the first digit of (1) and modulates the resultIs divided intoData blocks with equal lengths; Step S3, satellite Using a transformation matrixBased on the modulation resultThe obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame; SatelliteUsing a transformation matrixBased on the modulation resultThe obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame; SatelliteUsing a transformation matrixBased on the modulation resultThe obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame; SatelliteUsing a transformation matrixBased on the modulation resultThe obtained frame data are respectively subjected to time-frequency domain expansion transformation to obtain the transformation result of each frame; The transformation matrixTransformation matrixTransformation matrixTransformation matrixFourier transform matrix according to spread weighted scoreThe method specifically comprises the following steps: extended weighted score fourier transform matrix The method comprises the following steps: Wherein, the Is of the size ofIs used for the matrix of units of (a),Is of the size ofIs used for the fourier transf