带限波形多径CDMA信道能量有效性的功率控制和接收机设计
Power control and receiver design for energy efficiency in multipath CDMA channels with bandlimited waveforms
摘要：
本文通过博弈论的方法研究了无线数据网中联合多用户检测和功率控制的跨层设计问题。在Meshkati等人工作的基础上，其中，为了在简单的同步码分多址系统中实现能量效率，使用博弈论的工具，将系统非线性、带限码片脉冲的使用以及由无线信道引起的多径失真明确地结合到分析中。提出了几种非合作游戏，其中用户可以改变他们的发射功率和他们的上行链路接收机，以最大限度地提高他们的效用，这在这里被定义为数据吞吐量发射功率的比率。特别是，首先考虑在接收机处采用线性多用户检测器的情况，然后考虑采用非线性判决反馈多用户检测器的更具挑战性的情况。所提出的游戏示承认一个独特的纳什均衡点，而仿真结果表明所提出的解决方案的有效性，以及使用的决策反馈多用户接收机带来显着的性能改善。
英文摘要：
This paper is focused on the cross-layer design problem of joint multiuser detection and power control for energy-efficiency optimization in a wireless data network through a game-theoretic approach. Building on work of Meshkati, et al., wherein the tools of game-theory are used in order to achieve energy-efficiency in a simple synchronous code division multiple access system, system asynchronism, the use of bandlimited chip-pulses, and the multipath distortion induced by the wireless channel are explicitly incorporated into the analysis. Several non-cooperative games are proposed wherein users may vary their transmit power and their uplink receiver in order to maximize their utility, which is defined here as the ratio of data throughput to transmit power. In particular, the case in which a linear multiuser detector is adopted at the receiver is considered first, and then, the more challenging case in which non-linear decision feedback multiuser detectors are employed is considered. The proposed games are shown to admit a unique Nash equilibrium point, while simulation results show the effectiveness of the proposed solutions, as well as that the use of a decision-feedback multiuser receiver brings remarkable performance improvements.
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