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A Time-Frequency Energy Complete Averaging Transmission Method Based on Extended Weighted Fractional Fourier Transform

A technology of fractional Fourier transform and transmission method, which is applied in the field of signal time-frequency energy complete average transmission, which can solve the problems of poor ability to disperse and compensate for channel fading, improve dispersion and compensation capabilities, improve anti-fading performance and transmission The effect of reliability and good compatibility

Active Publication Date: 2022-04-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the poor ability of the existing method to disperse and compensate channel fading, and propose a completely averaged transmission method of signal time-frequency energy

Method used

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  • A Time-Frequency Energy Complete Averaging Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Time-Frequency Energy Complete Averaging Transmission Method Based on Extended Weighted Fractional Fourier Transform
  • A Time-Frequency Energy Complete Averaging Transmission Method Based on Extended Weighted Fractional Fourier Transform

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specific Embodiment approach 1

[0047] Specific implementation mode 1. Combination figure 1 This embodiment will be described. A signal time-frequency energy complete average transmission method based on extended weighted fractional Fourier transform described in this embodiment, the method divides the 0 and 1-bit data generated by the information source into several pieces with the same length at the sending end After the frame, the extended weighted fractional Fourier transform is performed on each frame of data respectively to obtain the output signal of each frame data after the extended weighted fractional Fourier transform;

[0048] The manner of the extended weighted fractional Fourier transform is:

[0049]

[0050] Among them, F k Represents the kth frame data, F k1 Represents the output signal of the k-th frame data after the extended weighted fractional Fourier transform, the superscript T represents the transpose, E is the transformation matrix, β l is the weighting coefficien...

specific Embodiment approach 2

[0064] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the method at the sending end needs to go through the following processing steps before framing the 0 and 1 bit data generated by the source:

[0065] Baseband constellation mapping is performed on the 0 and 1 bit data generated by the source to obtain the modulation result after constellation mapping.

[0066] In the present invention, the modulation result after constellation mapping is subjected to frame processing, and the specific process of frame processing is as follows:

[0067] The first bit, the second bit, ..., the second bit of the modulation result N bit data as the first frame, the modulation result of the 2nd N +1 place, 2nd place N +2 digits, ..., 2nd N+1 bit data as the second frame, and so on.

[0068] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0069] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the output signal F corresponding to each frame data k1 , k=1, 2, ..., K is processed, and it is specifically:

[0070] The output signal F corresponding to each frame data k1 , k=1, 2,..., K is expressed as a serial digital signal F, F=[F 11 f 21 …F k1 …F K1 ], the signal F is processed by digital / analog conversion and up-conversion in turn, and the processed signal is transmitted to the channel.

[0071] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

A signal time-frequency energy complete average transmission method based on extended weighted fractional Fourier transform belongs to the technical field of wireless communication. The invention solves the problem of poor capability of dispersing and compensating channel fading in existing methods. The invention realizes the design of the extended mixed carrier signal having both time-domain energy averaging characteristics and frequency-domain energy averaging characteristics through the extended weighted fractional Fourier transform. In a fading channel, the energy loss of each symbol is shared by other symbols, and its energy is well preserved. The receiving end only needs to perform the corresponding inverse transformation to achieve signal recovery with high probability. The solution proposed by the invention greatly improves the dispersion and compensation capabilities for channel fading, effectively reduces the bit error rate under fading channels, and improves the reliability of the communication system. At the same time, the method has good compatibility with the existing communication system. The present invention can be applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a signal time-frequency energy complete average transmission method based on extended weighted fractional Fourier transform. Background technique [0002] In the field of wireless communication technology, single-carrier and multi-carrier are currently two standardized mainstream communication systems. Single-carrier signals have good frequency-domain energy distribution and are sensitive to time-domain dispersion; multi-carrier signals have good time-domain energy distribution and is more suitable for combating time-selective fading. On this basis, the mixed carrier system combines the advantages of the two, and the signal energy is dispersed and backed up in the time-frequency plane through the weighted fractional Fourier transform, and the superior performance under the time-frequency dual fading channel is obtained. However, the existing methods ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
CPCH04L25/03012H04L25/03159H04L25/03343
Inventor 沙学军宋鸽房宵杰
Owner HARBIN INST OF TECH
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