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Error Correction Method for Parallel Interference Elimination of Spread Spectrum Signals in Weighted Fractional Fourier Transform Domain

A fractional Fourier transform and interference cancellation technology, applied to the shaping network of the transmitter/receiver, baseband system components, etc., can solve the problems of PIC method error diffusion, demodulation of other user information, etc., to achieve Effect of improving bit error performance

Active Publication Date: 2019-04-09
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The present invention solves the problem of code error diffusion brought about by the PIC method used in the receiving end of the wireless system and affects the demodulation of other user information, thereby providing a weighted fractional Fourier transform domain spread spectrum signal parallel interference elimination error Correction method

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  • Error Correction Method for Parallel Interference Elimination of Spread Spectrum Signals in Weighted Fractional Fourier Transform Domain
  • Error Correction Method for Parallel Interference Elimination of Spread Spectrum Signals in Weighted Fractional Fourier Transform Domain
  • Error Correction Method for Parallel Interference Elimination of Spread Spectrum Signals in Weighted Fractional Fourier Transform Domain

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specific Embodiment approach 1

[0040] Specific embodiments 1. Weighted Fractional Fourier Transform Domain Spread Spectrum Signal Parallel Interference Elimination Error Correction Method,

[0041] The mathematical tool that the present invention relates to is Weighted Fractional Fourier Transform (WFRFT);

[0042] Discrete Time Signal X 0 (n) α-order 4-WFRFT (in the present invention, also referred to as WFRFT):

[0043]Y(n)=F α [X 0 (n)] = ω 0 (α)X 0 (n)+ω 1 (α)X 1 (n)+ω 2 (α)X 2 (n)+ω 3 (α)X 3 (n) (1)

[0044] Where: [X 0 (n),X 1 (n),X 2 (n),X 3 (n)] are X 0 (n) 0 to 3 discrete Fourier transform (Discrete Fourier Transform, DFT), DFT is calculated using the formula (2).

[0045]

[0046] The weighting coefficient definition used is:

[0047]

[0048] Assuming that the 4-WFRFT system uses block transmission, Y(n) is a discrete-time signal after a group of baseband mapping signals undergo 4-WFRFT.

[0049] At the sending end, the K baseband mapped signals are first divided into a g...

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Abstract

A weighted fractional Fourier transform domain spread-spectrum signal parallel interference elimination error correction method relates to the field of wireless communication. The invention aims to solve the problem that the PIC method used in the receiver of a wireless system causes error diffusion and affects the demodulation of other user information. According to the invention, multiple symbol energy accumulation units and a symbol energy decision unit are added on the basis of realizing information decoding using parallel interference elimination, and if there is one signal after extension of which the energy accumulation value is smaller than the average energy accumulation value, the first judgment result is correspondingly corrected to reduce error diffusion in order to improve the bit error rate performance of the system. The method of the invention is applicable to a scene in which a weighted fractional Fourier transform domain spread-spectrum signal is demodulated using a parallel interference elimination approach.

Description

technical field [0001] The invention relates to the field of wireless communication. Background technique [0002] Recently, a hybrid carrier (HC) system based on weighted fractional Fourier transform (WFRFT) was proposed, which can combine the characteristics of single-carrier and multi-carrier systems, and has better adaptability to time-frequency interference channels (Reference 1: In June 2010, Mei Lin, Sha Xuejun, and Zhang Naitong published "The Approach to Carrier Scheme Convergence Based on 4-Weighted Fractional Fourier Transform"). [0003] At the same time, Code Division Multiple Access (CDMA) technology is an effective multiple access and anti-multipath interference technology. Therefore, in order to take advantage of the advantages of the two, the HC-CDMA system that combines the hybrid carrier technology and the code division multiple access technology is proposed (patent 2: Sha Xuejun, Qiu Xin, Mei Lin, Wang Kun, Fang Xiaojie in 2011 "A Hybrid Carrier Spread ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 沙学军王晓鲁梅林
Owner HARBIN INST OF TECH