In this paper, the succinct nonbinary MAP algorithm is derived, and the analytical performance of Turbo TCM technique is presented in mobile satellite channel.

In order to solve the problem that Sub-MAP algorithm has definite approximate error,Sub-MAP algorithms is improved by approaching by piecewise line, and a calculation model of metrics is proposed for the algorithm.

This paper first analyses the conventional algorithm for Turbo-codes decoding based on MAP,then points out the defect of these algorithm on decoding delay,analyzes conventional SW-MAP algorithm that can reduce decoding delay;and finally presents an improved scheme of SW-MAP algorithm based on its characters.

Based on the conventional Log-MAP algorithm for Turbo-codes decoding and the existing algorithm for simplifying Log-MAP,an improved algorithm is presented in this paper.

When turbo decoder is implemented by Log-MAP algorithm, it is necessary to calculate the correction term by look-up table (or other ways).

Based on Log-MAP algorithm of easy engineering implementation, the two different methods of using extrinsic information, the Berrou and Robertson schemes, are studied deeply in the paper.

The encoding and decoding of nonbinary convolutional Turbo codes and the MAP algorithms based on bit decision in 802.

This paper first analyses the conventional algorithm for Turbo-codes decoding based on MAP,then points out the defect of these algorithm on decoding delay,analyzes conventional SW-MAP algorithm that can reduce decoding delay;and finally presents an improved scheme of SW-MAP algorithm based on its characters.