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The performance of multiple access interference (MAI) cancellations for the asynchronous M-ary pulse position modulation (PPM) time hopping (TH) ultra-wideband (UWB) systems are investigated. Parallel interference cancellation (PIC) and successive interference cancellation (SIC) are the most popular interference cancellation schemes. However, both the PIC and SIC have some shortcomings that the PIC...
A turbo principle based iterative multiuser detection is proposed to reduce the BER in LDPC coded FFH/MFSK MA systems. First, a three-level hard-limiter on each chip with maximum-likelihood decision is made to avoid soft output ambiguity. Secondly, the reliable information from channel decoder is applied to aide multiuser interference reduction. When the soft reliability information of coded bit exceeds...
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