作者: Kazushi Mimura , Masato Okada
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摘要: We investigate the detection dynamics of a soft parallel interference canceler (soft-PIC), which includes hard-PIC as special case, for code-division multiple-access (CDMA) multiuser detection, applied to randomly spread, fully synchronous base-band uncoded CDMA channel model with additive white Gaussian noise under perfect power control in large-system limit. analyze some iterative detectors, namely soft-PIC, Onsager-reaction-canceling (ORC-PIC) and belief-propagation-based detector (BP-based detector), by generating functional analysis (GFA). The GFA allows us study asymptotic behavior infinitely large system without assuming independence messages. stationary estimates an algorithm. also show decoupling principle algorithms For generic algorithm binary input, it is shown that equivalent bank independent single-user non-Gaussian channels, whose signal-to-noise ratio degrades due both Onsager reaction, at each stage If cancels channels coincide channel. discuss ORC-PIC BP-based detector.