The Analysis Of The Design And Performance Of An Interleaver Based On Chaotic Pseudo Random Sequence

How to improve the reliability and efficiency of information transmission has been a research focus in digital communication system. In 1948, Claude Elwood Shannon put forward the way of improving the reliability of communication through channel coding in noisy channel in the thesis of A Mathematical Theory of Communication. In existing options of channel decoding, Turbo code applied the conditions of random coding and decoding in Shannon theory comparatively well, thus achieved the decoding performance close to the limit of Shannon theory, which is a milestone in the developing history of channel coding theory.This article analyses the arithmetical theory and fundamental elements of the coding and decoding of Turbo code systematically, focuses on the discussion of the interleaving technology of Turbo code, and puts forward a new interleaving option based on chaotic pseudo random sequence(CPRS). Judging from the emulation results, the above-mentioned interleaver improved the overall performance of Turbo code to some extent. This thesis mainly:1. gives an overview of the theory and development of channel coding, and summarizes the status quo and developmental trend of the research of Turbo coding at home and abroad;2. discusses the arithmetical theory and fundamental elements of the coding and decoding of Turbo code, analyzes some decoding arithmetics in particular, and compares the performances of these decoding arithmetics;3. summarizes the designing requirement rules of interleavers in allusion to the important role interleavers plays in Turbo codes; introduces some types of interleavers commonly used in present Turbo codes, and makes an emulation comparison of these interleavers;4. introduces the chaos theory briefly, and analyzes the characteristics of its mapping relations; expounds the generating principles of chaotic pseudo-random sequence which our school owns indigenous intellectual property, and analyzes its random performance; puts forward a new interleaving option based on chaotic pseudo-random sequence, and proves this interleaver brings some improvement to the overall performance of Turbo code through emulation;5. emulates and analyzes the impacts of various parameters on the performance of Turbo code, and these parameters includes:component code, interleaving length, coding rate, number of decoding iteration, decoding arithmetic, etc.