Research On Cnannel Encoding Technology In SSC

The spread spectrum communication system has stronger ability of resisting narrow band and multipath interference than that of the conservation communication systems. And it also has the characteristics of low probability of intercept and multiple access secure communication.Now,the SS technology has expanded from the military field to the commercial field.This thesis discussed the principle and the develop of the SS communication technique.And I focus on the Channel Encoding technology.Channel Encoding technology is one of the key technology in SSC. It aims to realize the non-error transmission of the signal. This paper discusses the background, history and the signification of the Channel Encoding technology. I mainly recommended the principle and software realization of Convolutional coding in this paper.Convolutional coding is the common function in wireless communications. It has legible structure and good error-check and error-correct character, but the decoder of Convolutional coding is difficult and Viterbi decoding now is the comparative good function of decoding.For channel of wireless, the error was occurred paroxysmal, a paroxysmal error will make for a succession of errors. So, many error- correcting codes will be helpless. None but to complect the code, which can lead the code be corrected by those error correcting code.In this thesis,I use convolutional interleaving technology. All these programs were written by Matlab.I arranged my paper as follow: the background and arrangement of this paper are introduced in Chapter 1 ;the principle of SSC is introduced in Chapter 2; Block coding, Convolutional coding,interleaving technology and Viterbi decoding are respectively introduced in Chapter 3 , Chapter 4 , Chapter 5 and Chapter6. Last Chapter intruduced the summarize of the paper.