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International audience; In this paper, a binary serial turbo LDPC code is presented. It represents a serial concatenated LDPC codes separated by interleavers, with iterative decoding. In this work, we aim to investigate the performance evaluation of concatenated code, with reduced complexity and decoding delay, associated with high order constellation using Gray mapping, over Gaussian and Rayleigh channels. Simulation results show that the performance of a serial concatenated LDPC codes is higher than that of single LDPC code with the same code rate and code block length.

Achieving high spectral efficiency is the key requirement of future wireless systems and mobile communications because it provides us a high quality for high data over a limited bandwidth. In order to achieve high spectral efficiency, channel coding and modulation are the key part. Basically, high spectral efficiency can be achieved when adopting a high order modulation and low code rate. Thus, the transmission with high spectral efficiency needs a high performance error correcting code. In this paper, a high performance binary LDPC code is introduced, and the performance of this code is evaluated . It is obtained by a parallel concatenation of two identical regular binary LDPC codes, separated by an interleaver through the turbo-code structure proposed by Berrou and others. Simulation results show that the performance of the proposed code, with higher order constellations (16-QAM, 64-QAM and 256-QAM) using Gray mapping, under Gaussian and Rayleigh channels has higher performance than a single LDPC code with the same block length. Also, we show that its performance can be improved with the increasing of two numbers of iterations: global iterations and/or iterations of binary LDPC codes, and the interleaver in the proposed code has a positive effect on the performance