Design And Realization Of Interleaver Based On Turbo Code

With the rapid development of mobile communication, there are a series of advanced technology, which have made great contribution to its development. Channel coding is one of these technology and it plays an important role in the wireless communication. Because the environment of wireless communication is usually bad, for example, the signal to mask ratio of channel encoding is very low; the multi-path fading and Doppoler's frequency departure have influence on the environment of wireless communication. Therefore, it is desperately needed to solve this problem by seeking for the powerful debugging tools under the condition of low signal to mask ratio. Finally Berrou, Glavieux and Thitirnajshima published an article: A kind of method of encoding and decoding which is close to Sharron's error control: Turbo code. In their article, the encoding and decoding mechanism named Turbo has approached the Sharron's limit to 0.7dB than ever before.Interleaver is the most important part of Turbo coding machine. In the process of encoding, interleaver can make both two sub-encoding work respectively. Meanwhile in decoding, interleaver has become the bridge to connect the two sub-decoding machines. Owing to the inter-leaver, a mistake which can not be corrected by one sub-decoding machine at the termination of decoding, can be divided by another sub-decoding machine, and the mistake can be corrected.This article put great emphasis on the study of design and improvement about the interleaver of Turbo coding. At the same time ,it tries to make function analysis. From the point of adapting to the next generation of mobile communication with high speed, effective improvement has been made to the random interleaver. In this article, a kind of calculation has come into being from this study. The calculation can produce a new random interleaver after comparing and analyzing all sorts of interleaves. The Turbo coding machine reflect the period of multiple style. In order to improve the function of the whole coding, the inter-leaver which was designed on the basis of such period, tries to get the hamming weight code letter(can not be divided exactly), and this purpose is always in the first place. After comparison and imitative analysis of some interleaver with same length, it proves that the interleaver in study performs satisfactorily.