Research On Technology Of Channel Encoding In Spread Spectrum Communication System

Spread Spectrum Communication (SSC) is developed with its application in military communication. It owns a lot of advantages that other communication system do not have. With the development of Spread Spectrum Communication technology, it gradually applied in civil communication widely.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 hardware realization of Block coding, Convolutional coding and Turbo 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 decode now is the comparative good function of decoding. Turbo coding has great character of error-check and error-correct and can almost reach the Shannon limitation, also it has complicated structure in both encoder and decoder.I arranged my paper as follow: the background and arrangement of this paper are introduced in Chapter 1 ; Block coding, Convolutional coding and Turbo coding are respectively introduced in Chapter 2 , Chapter 3 and Chapter 4. In Chapter 5 I introduced LDPC coding which now is with pop research. In Chapter 6 I introduced the whole project---"design of the wireless spread spectrum chip"and it's hardware (FPGA) realization. Last Chapter intruduced the summarize of the paper.