Abstract

Sparse code multiple access (SCMA) has been considered as one of the candidate techniques to realize nonorthogonal multiuser transmission. In this paper we investigate the SCMA transmission in block fading channels with arbitrary coherent bandwidth. The extension from the SCMA base graph is performed by the cyclic shift of identity matrices. We derive the condition for generating the extended factor graph to combat the block fading, and then we present an algorithm for constructing the superposition matrix simply. Numerical results in terms of symbol error rate is evaluated, which shows that the proposed structure significantly outperforms the base graph and the randomly extended graph. The full diversity can be achieved in block fading channels by following the proposed algorithm.

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