Successive interference cancellation algorithm in m-QAM nonorthogonal multicarrier systems

This article investigates non-linear and linear receivers to detect N non-orthogonal m-QAM signals through AWGN channel: maximum likelihood receiver (ML), minimum mean square error (MMSE), successive interference cancellation (SIC) and a completely new architecture called modified SIC. An analytical development of the project from each one of the proposed architecture is performed. As contribution we present the performance of the modified SIC in terms of bit error rate (BER) which is close to the performance of the ML receiver with less computational complexity. Another contribution is the determination of the minimum distance among non-orthogonal signals according to spectral overlapping considering N = 5. Finally, the results are discussed as well as our future prospects of research.