Concatenation of space-time block codes and LDPC codes

Space-Time coding is widely used in wireless communication systems, in order to provide diversity gain and overcome fading effects of multipath propagation, also by using channel codes, such as Convolutional, Turbo and LDPC coding, we can increase coding gain and obtain performance result near to Shannon limit. In this paper, we consider the concatenation of LDPC coding as outer code and Alamouti'sG
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space-time block codes as inner codes to achieve the benefits of both techniques; In addition the performance of proposed system is studied as a function of LDPC decoding parameters e. g. frame length, number of iteration, coding rate and constellation mapping over Rayleigh flat-fading and AWGN noisy channel.