Performance improvement of turbo codes by error range search method in Rayleigh fading channel

Turbo codes has better performance as the number of iteration and interleav er's size increases. This requires the delay and computational complexity f or decoding an input data. In this paper, we propose an efficient method of decoding Turbo codes that can greatly reduce the iteration number with ver y low-complexity, The MAP algorithm depends on the adjacent bits or receive d symbols, Therefore, to improve performance of MAP algorithm, the reliabil ity of adjacent received symbols has to be guaranteed Thus, we propose a si mple ERS (Error Range Search) method for reliability of received symbols in MAP algorithm. Using the proposed ERS method, we analyze the performance o f ERS/MAP algorithm and ERS/Turbo decoder in Rayleigh fading channel.