New Parallel Interference Cancellation for Coded MC-DS-CDMA

In this paper, by the application of Turbo principle, a new parallel interference cancellation and decoding (PIC/decoding) algorithm for convolutionally-coded multi-carrier DS-CDMA (MC-DS-CDMA) is proposed. We give a detailed description of the proposed algorithm, and further mathematical analysis is also performed over it. The numerical simulation is made and corresponding results are obtained. From the numerical results we conclude that the proposed algorithm acquires much better performance than the conventional PIC/decoding, and what’s more, if a posteriori log-likelihood rate (LLR) rather than a priori LLR is used to estimate the tentative values at each interference cancellation stage, the proposed algorithm exihibits more dominant performance advantages. Keywords-multi-carrier; code division multi-access; loglikelihood rate (LLR); frequency diversity; BCJR algorithm