Research On Turbo Channel Encoding And Decoding Technologies In Deep Space Communication

Turbo code is a new class of error-correcting codes that can approach the Shannon bound. It is considered as the most exciting and potentially important development in coding theory in recent years. So Turbo code becomes one of the focuses on the channel-coding field. Two or more rationsystematic convolution encoders linked by an interleaver form Turbo encoder Anterative algorithm whose central core is a maximum a posteriori symbol-by-symbol decoder implements the proposed sub-optimal decoder.The contents that the article involve is as follow. First of all,the article introduces Deep Space Communication, and the history of channel coding development will be looked back on. It gives an introduction about international research condition of Turbo code.Secondly, the article explains in great detail the normal method of encoding and decoding, compares some algorithmic performance and introduces the new development of turbo codes. And then,it shows several methods of interleaver,In this chapter ,the author produces a new random interleaver which has the performances about S-distance,mode-2 and symmetry.The article introduces the simulated method, compares these performance and analyzes the cause,compare other parameter's influence, proposes an ameliorative decoding arithmetic;At last,it introduces the EDA and proposes the VHDL method of some structure in turbo code, mainly about interleaver and encoding.