基于纠错纠删RS-Turbo级联码的跳频抗干扰方法

发布时间：2018-07-08 18:54

本文选题：跳频 + RS码　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：短突发跳频通信由于在通信隐蔽性和增大设备干扰容限等方面有优越的性能,因此被广泛应用在军事通信抗干扰中。在低信噪比、短突发、大多普勒频移条件下,能够进行高速率数据传输是跳频通信系统所必需的要求。针对短突发跳频通信系统的干扰方式有很多,其中最为典型的是部分频带干扰。为了达到可靠通信的目的,短突发跳频通信系统不仅需要在极低信噪比下利用开销小的短导频序列实现高精度的载波同步,同时还需要采用纠错能力极强的纠错编码对数据进行保护。本文在研究国内外信道编码和载波同步算法的基础上,首先论述了Turbo码的编译码原理,分析了Turbo码的“错误平层”现象,并仿真了影响Turbo译码性能的因素。其次,研究了RS码有关代数知识,分析了RS编码原理,重点论述了代数译码原理。结合QPSK调制载波同步要求,本文利用RPA算法对载波进行估计,利用Costas算法对载波相位进行跟踪。为了同时利用RS码在高信噪比下的性能优势和Turbo码在低信噪比时的性能优势,改善Turbo码的“错误平层”现象,克服部分频带干扰下无法正常通信的问题,提出码元-频点帧结构,并巧妙的将纠删RS码与码元-频点帧结构相结合,在此基础上,提出可变删除位的纠错纠删RS-Turbo级联码的跳频抗干扰方法,仿真分析了该算法在高斯白噪声信道和部分频带干扰信道下的性能,通过仿真验证系统能抗60%左右的频点干扰。
[Abstract]:Short burst frequency hopping communication is widely used in military communication because of its excellent performance in communication concealment and increasing the interference tolerance of equipment. Under the condition of low signal-to-noise ratio, short burst and large Doppler frequency shift, it is necessary for FH communication system to be able to transmit data at high rate. There are many interference modes for short burst frequency hopping communication system, among which partial frequency band interference is the most typical. In order to achieve reliable communication, the short burst frequency hopping communication system not only needs to use the short pilot sequence with small overhead to achieve high precision carrier synchronization at very low SNR. At the same time, it is necessary to protect the data by error correcting coding. Based on the research of channel coding and carrier synchronization algorithms at home and abroad, this paper first discusses the encoding and decoding principle of Turbo codes, analyzes the "error level" phenomenon of Turbo codes, and simulates the factors that affect the performance of Turbo decoding. Secondly, the algebraic knowledge of RS code is studied, the RS coding principle is analyzed, and the algebraic decoding principle is emphasized. Considering the requirement of QPSK modulation carrier synchronization, this paper uses RPA algorithm to estimate the carrier and Costas algorithm to track the carrier phase. In order to make use of the performance advantages of RS codes under high SNR and Turbo codes with low SNR at the same time, the "error level" phenomenon of Turbo codes is improved, and the problem of normal communication under partial band interference is overcome. The code-frequency frame structure is proposed, and the erasure RS code and the code-frequency frame structure are skillfully combined. On this basis, a frequency-hopping anti-jamming method of error-correcting RS-Turbo concatenated code with variable deletion bit is proposed. The performance of the algorithm in Gao Si white noise channel and partial band interference channel is analyzed by simulation. The simulation results show that the system can resist about 60% frequency point interference.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.22

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