Research And Simulation In AWGN Channel Of A New TURBO Code Encoding And Decoding Structure

TURBO code is the channel coding technology of the third generation mobile communication system , the study of its encoder and decoder have a very important significance.In the course of designing the system, Constitute respective system models according to the different principles of PCCC and SCCC using the method of appropriate module division. Simulate the sub modules in order to design the integer system and execute the simulations of the sub-modules. At last, by simulating the two systems, acquire the conclusions below: By increasing the length of interlleaving, choosing a good interle-rleaver, adopting a appropriate RSC encoder strcture, applying a outstanding decoding arithmetic and increasing the number of iteration can get a good performance TURBO codeThe primary contents of this thesis are:1. Elaborate the inventing, development status and the application value of TURBO code at first.2. Discuss the encoder and decoder structure and principle of three types of TURBO code (Serially Concatenated Convolutional Code (SCCC), Parallel Concatenated Convolutional Code (PCCC) and Hybrid Concatenated Convolutional Code (HCCC) detailedly.3. Dissertate the key technique in the encoding and decoding of TURBO code. Deep into discussing the decoding algorithm.4. Ground on the discussion above, establish two communication system models with SIMULINK which validate the performance of SCCC and PCCC in AWGN channel.5. Get a mass of statistics of the simulation and draw the performance curve of PCCC and SCCC in different parameter conditions. Consequently acquire the parameter conditions which affect the performance of PCCC and SCCC. And validate the basic theories of TURBO code such as iterative decoding and the PCCC error floor and so on.This design simulates the performance of TURBO code with SIMU-LINK in MATLAB and proves that TURBO code have low error rate , and have the high practical application value.