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This paper is focused on the cross-layer design problem of joint multiuserdetection and power control for energy-efficiency optimization in a wirelessdata network through a game-theoretic approach. Building on work of Meshkati,et al., wherein the tools of game-theory are used in order to achieveenergy-efficiency in a simple synchronous code division multiple access system,system asynchronism, the use of bandlimited chip-pulses, and the multipathdistortion induced by the wireless channel are explicitly incorporated into theanalysis. Several non-cooperative games are proposed wherein users may varytheir transmit power and their uplink receiver in order to maximize theirutility, which is defined here as the ratio of data throughput to transmitpower. In particular, the case in which a linear multiuser detector is adoptedat the receiver is considered first, and then, the more challenging case inwhich non-linear decision feedback multiuser detectors are employed isconsidered. The proposed games are shown to admit a unique Nash equilibriumpoint, while simulation results show the effectiveness of the proposedsolutions, as well as that the use of a decision-feedback multiuser receiverbrings remarkable performance improvements.

Power control and receiver design for energy efficiency in multipath CDMA channels with bandlimited waveforms