Optimal Detector for Discrete Transmit Signals in Gaussian Interference Channels

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Executive Summary

This paper addresses the design of optimal and near-optimal detectors for a practical interference channel scenario where the transmitters employ discrete modulation schemes. The conventional detectors, which either ignore the interference or successively detect then cancel the interference, typically assume that the desired signal and/or the interference are Gaussian. This paper proposes detectors that explicitly take into account the modulation formats of both the desired signal and the interference. The optimal Maximum-Likelihood (ML) detector that minimizes the probability of detection error for a given set of modulation schemes is derived first.

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