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The maximum information rates for bandlimited channels with direct detectionare achieved with joint detection and decoding (JDD), but JDD is often toocomplex to implement. Two receiver structures are studied to reduce complexity:separate detection and decoding (SDD) and successive interference cancellation(SIC). For bipolar modulation, frequency-domain raised-cosine pulse shaping,and fiber-optic channels with chromatic dispersion, SIC achieves rates close tothose of JDD, thereby attaining significant energy gains over SDD and intensitymodulation. Gibbs sampling further reduces the detector complexity and achievesrates close to those of the forward-backward algorithm at low to intermediatesignal-to-noise ratio (SNR) but stalls at high SNR. Simulations with polarcodes, higher-order modulation, and multi-level coding confirm the predictedgains.

Successive Interference Cancellation for Bandlimited Channels with Direct Detection