In Td-scdma Physical Layer Simulation And Turbo Encoding And Decoding Studies

We are all being exposed to a revolution in communications, which is taking us from a world where telephone subscribers were constrained to communicate over fixed telephone lines, to one where a global and mobile communications environment has become reality. The third mobile telecommunication system (3G) labeled as wide-band, multimedia service and seamless roaming has being outstanding in this revolution. Besides the research on core network technologies, one key to this system is the research on radio transmitter technologies that can achieve better bandwidth efficiency and better reliability.This thesis remarks and compares the predominant standards in the modern mobile communications, studies the key characteristics and simulation model of wireless mobile channel, constructs a simulation platform for the TD-SCDMA and is addressed to the multiplexing and channel coding. Specific contents are as follows:(l)Firstly, This thesis gives a description of multi-address, such as CDMA,FDMA, TDMA and so on. And address the theory of spread spectrum technique and draw a conclusion of the merit of spread spectrum communications system. In the end, it compares three kinds of 3G mobile standards that WCDMA, CDMA2000, TD-SCDMA, and conclude the merits and defects of TD-SCDMA.(2)Secondly, it analyses the key characteristics of physical channel in wireless mobile communications, which determine the mathematical model. In addition, it analyses and builds two kinds of simulation model, Jakes model and Multi-path Rayleigh fading model, corresponding to narrow-band and wide-band respectively.(3)Thirdly, after describing the structure of physical layer in TD-SCDMA in brief, the thesis shows the systemic diagram of its...