MMSE Relaying and Power Allocation over Frequency-Selective Rayleigh Fading Channels

Tung T. Pham, Ha H. Nguyen, D. Nguyen, H. Tuan
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Abstract

This paper develops an amplify-and-forward relaying technique for multiuser wireless cooperative networks under frequency-selective block-fading. Single-carrier frequency division multiple-access with frequency-domain equalization technique is employed at both the relay and destination to combat the inter-block and inter-symbol interference caused by multipath propagation. With the assumption that the full channel state information (CSI) is available at the destination, the relay only knows the uplink channels while no CSI is available at the sources, two power allocation schemes are obtained: (i) to minimize the total transmit power at the relay while maintaining the signal-to-interference-plus-noise ratio (SINR) for each user at the destination above a certain level, and (ii) to maximize the worst SINR among all the users subject to a constraint on total relay transmit power. Analysis and simulation results are provided to illustrate the effectiveness of the proposed schemes.
频率选择瑞利衰落信道上的MMSE中继和功率分配
本文研究了一种多用户无线协同网络在频率选择分组衰落条件下的放大转发中继技术。在中继和目的端均采用带频域均衡技术的单载波分频多址,以克服多径传播引起的块间和码间干扰。假设目的端有完整的信道状态信息(CSI),中继端只知道上行信道,而源端没有CSI,得到两种功率分配方案:(1)使中继处的总发射功率最小,同时使目的地各用户的信噪比(SINR)保持在一定水平以上;(2)在中继总发射功率约束下,使所有用户的最差SINR最大化。分析和仿真结果说明了所提方案的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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