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The problem of signal design for bandwidth efficient multiple access is addressed under Quality of Service (QoS) constraints specified by (possibly different) BER. Indeed, BER more accurately measures the performance than the Signal-to-Interference Ratio (SIR) for uncoded communication. Furthermore, the authors argue that the Asymptotic Effective Energy (AEE) faithfully characterizes BER, and they translate the BER-specified QoS into AEE-specified ones. They then propose a recursive, greedy algorithm for joint signal design to minimize the system bandwidth while ensuring that each user achieves its desired AEE (and hence BER). This algorithm successfully converts excess power into bandwidth savings under reliability constraints, and significantly improves spectral efficiency over full-rank (e.g. orthogonal) signaling and SIR-based approaches.
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