Abstract
The performance of the turbo codes can be improved by varying parameters such as block size, code polynomial structure and constraint length. This paper proposes a new asymmetric turbo codes that consists of parallel concatenated component codes with mixed type generator polynomials and also different constraint lengths. This scheme optimizes the BER performance of asymmetric turbo codes of both Waterfall region at lower SNR’s and error-floor region at higher SNR’s. The simulation results shows better BER performance of asymmetric turbo codes for block size of 128, 512 bits, code-rate of 1/2 and Maximum-A-Posteriori (MAP) decoding algorithm over AWGN channel with BPSK modulation by using MATLAB.
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