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Method for realizing equalization of FBMC system by utilizing improved sphere decoding algorithm

A technology of sphere decoding and algorithm, which is applied in the field of equalization of FBMC system by using improved sphere decoding algorithm, which can solve the problems of increasing computational complexity of the algorithm

Inactive Publication Date: 2013-06-05
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, when the white noise of the system is too large, it will lead to an increase in the computational complexity of the algorithm.

Method used

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  • Method for realizing equalization of FBMC system by utilizing improved sphere decoding algorithm
  • Method for realizing equalization of FBMC system by utilizing improved sphere decoding algorithm
  • Method for realizing equalization of FBMC system by utilizing improved sphere decoding algorithm

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Embodiment Construction

[0072] The specific implementation process of the present invention will be described below in conjunction with the accompanying drawings and examples.

[0073] figure 1 Be the step flow chart of the present invention, as shown in the figure, a kind of method utilizing improved sphere decoding algorithm to realize the equalization of FBMC system of the present invention comprises the following steps:

[0074] 1. Establish FBMC system model and define FBMC system parameters

[0075] 1 Continuous time expression of FBMC system

[0076] The baseband transmission signal of the FBMC system is expressed as:

[0077]

[0078] Among them, K=2M is the number of subcarriers, F 0 =1 / T 0 =1 / 2τ 0 is the subcarrier frequency interval, p is the real even pulse waveform function, for the additional phase. a m，n The QAM modulated symbol c by the transmitted signal m，n The real and imaginary parts of , the transmitted signal can also be regarded as the basis function extension, and...

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Abstract

The invention provides a method for realizing the equalization of an FBMC system by utilizing improved sphere decoding algorithm, which comprises the following steps: by setting up an FBMC system model, and defining FBMC system parameters, analyzing the main factors of the equalization algorithm performance affecting the FBMC system; carrying out the improved sphere decoding algorithm; and carrying out simulation experiments for the algorithm and comparing; and analyzing simulation results. The improved sphere decoding algorithm means that the equalization of the FBMC system can be realized by lowering the complexity of the sphere decoding algorithm, and comprises the following steps: defining the equalization of the FBMC system; and realizing the equalization of the FBMC system by the method of probability estimate of d'2-LB (k-1) >= | | zk: M-Rk: M, K: Mbk: M | | 2 to lower the complexity of the sphere decoding algorithm. The invention utilizes the improved decoding algorithm to lower the bit error rate and the complexity of equalization algorithm of the FBMC system, and carries out verification by the simulation experiments, and the simulation results show that the improved decoding algorithm obviously lowers the complexity of the algorithm, has less loss of performance, has higher superiority and better meets the requirements of modern communications for real-time signal processing particularly when the signal to noise ratio is smaller, and has good prospects for development.

Description

Technical field: [0001] The invention belongs to the field of digital communication, and relates to a method for an equalization algorithm of an FBMC communication system, in particular to a method for realizing the equalization of an FBMC system by using an improved sphere decoding algorithm. Background technique: [0002] Multi-carrier modulation technology MCM is suitable for various communication methods, such as radio frequency communication, optical communication, etc., and is especially suitable for high-speed data transmission. Multi-carrier technology greatly reduces the symbol rate of each sub-carrier by dispersing data to many sub-carriers, so it has high spectrum utilization, higher spectrum efficiency than serial systems, and strong anti-multipath interference and frequency selective fading capabilities. Features. Traditional OFDM is one of the commonly used multi-carrier modulation techniques, which can effectively resist channel multipath fading and pulse int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26H04L1/00
Inventor 赵东峰周贤伟曾庆荣张培艳
Owner UNIV OF SCI & TECH BEIJING
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