多基站合作下行统计特征模式传输

Jun Zhang, Bin Jiang, Shi Jin, Xiqi Gao
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引用次数: 1

摘要

本文利用统计信道状态信息研究了多基站和单移动基站协同蜂窝网络的下行传输。我们考虑了一个通用的联合相关MIMO信道模型。我们首先提出了一种最大遍历和容量的最优传输方案,该方案揭示了所有基站的发射信号是相互独立的,最优信令方向是MIMO信道发射相关矩阵的特征向量。然后利用矩阵的恒等式,导出了遍历和容量的闭紧上界。基于这些结果,我们利用凸优化技术和简单的迭代注水算法开发了一个低复杂度的功率分配方案。仿真结果表明,遍历和容量的上界是紧的,基站合作传输方案提高了下行系统的和容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi-base station cooperation downlink statistical eigenmode transmission
This paper investigates the downlink transmission for cooperative cellular networks with multi-base stations and single mobile station using statistical channel state information at the base stations. We consider a general jointly correlated MIMO channel model. We first propose an optimal transmission scheme to maximize the ergodic sum capacity, which reveals the transmit signals of all base stations are mutual independent and the optimal signaling directions are the eigenvectors of the transmit correlation matrix of the MIMO channel. Then we employ the matrix permanents to derive a closed-form tight upper bound for the ergodic sum capacity. Based on these results, we develop a low-complexity power allocation solution using convex optimization techniques and a simple iterative water-filling algorithm. Simulations demonstrate the upper bound of ergodic sum capacity is tight and the cooperative base stations transmission schemes increase the downlink system sum capacity.
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