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Weighted Fractional Fourier Transform Domain Spread Spectrum Signal Serial Interference Elimination Error Correction Method

A serial interference elimination and fractional Fourier technology, applied to electrical components, transmission systems, etc., can solve the problems of SIC method error diffusion and affect the next-level information demodulation, and achieve the effect of improving bit error performance

Active Publication Date: 2017-11-07
严格集团股份有限公司
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Problems solved by technology

[0005] The present invention solves the problem of error diffusion caused by the SIC method used in the receiving end of the wireless system and affects the demodulation of the next level of information, thereby providing a weighted fractional Fourier transform domain spread spectrum signal serial interference elimination error Correction method

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  • Weighted Fractional Fourier Transform Domain Spread Spectrum Signal Serial Interference Elimination Error Correction Method
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  • Weighted Fractional Fourier Transform Domain Spread Spectrum Signal Serial Interference Elimination Error Correction Method

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specific Embodiment approach 1

[0034] Specific embodiments 1. Weighted fractional Fourier transform domain spread spectrum signal serial interference elimination error correction method,

[0035] The mathematical tool that the present invention relates to is Weighted Fractional Fourier Transform (WFRFT);

[0036] In the present invention, the discrete-time signal X 0 (n) α-order 4-WFRFT (in the present invention, also referred to as WFRFT):

[0037] 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)

[0038] 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).

[0039]

[0040] The weighting coefficient definition used is:

[0041]

[0042] 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.

[0043] At the sending end, the N baseband mapped signa...

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Abstract

The invention discloses a weighted FRFT domain spread-spectrum signal successive interference cancellation error correction method, and relates to the field of wireless communication. The invention aims at solving problems that an SIC method employed at a wireless system receiving end causes error spread, and the error spread affects the information demodulation at a next stage. The method adds a plurality of symbol energy accumulation units on the basis that the method employs successive interference cancellation to achieve information decoding, and enables each symbol energy accumulation to be compared with a former symbol energy accumulation. The method needs to correct a demodulated former signal and reduces the error spread if the energy is greater than the energy of the former stage, so as to improve the overall error performance of a system. The method is suitable to be used in a hybrid carrier system, and is used for a signal demodulation scene.

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 (Document 2: Sha Xuejun, Qiu Xin, Mei Lin, Wang Kun, Fang Xiaojie in 2011 "A Hybrid Carrier Sprea...

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Application Information

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IPC IPC(8): H04B1/7097
CPCH04B1/7097
Inventor 沙学军王晓鲁梅林
Owner 严格集团股份有限公司