MIMO Relaying With Linear Processing for Multiuser Transmission in Fixed Relay Networks
MIMO Relaying With Linear Processing for Multiuser Transmission in Fixed Relay Networks
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DOI：
10.1109/tsp.2007.907821
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发表时间：
2008-02
影响因子：
5.4
通讯作者：
C. Chae;Taiwen Tang;R. Heath;Sunghyun Cho
中科院分区：
文献类型：
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作者：
C. Chae;Taiwen Tang;R. Heath;Sunghyun Cho
本文提出了一种新的中继策略，使用多输入多输出（MIMO）固定中继与线性处理，以支持蜂窝网络中的多用户传输。固定中继器利用线性运算处理接收到的信号，并将处理后的信号转发给多个用户，从而创建多用户MIMO中继器。本文提出了上界和下界的可实现的和速率假设在基站迫零脏纸编码，忽略从基站到用户的直接链路，并在中继的某些结构。这些界限被用来激励一个可实现的多用户预编码策略，结合汤姆林森-原岛预编码在基站和线性信号处理在中继，自适应流选择，和QAM调制。降低复杂度的算法的基础上的总和率下限用于选择用户的子集。我们比较了所提出的系统架构和算法的总和速率的上限和解码和转发中继实现的总和速率。
In this paper, a novel relaying strategy that uses multiple-input multiple-output (MIMO) fixed relays with linear processing to support multiuser transmission in cellular networks is proposed. The fixed relay processes the received signal with linear operations and forwards the processed signal to multiple users creating a multiuser MIMO relay. This paper proposes upper and lower bounds on the achievable sum rate for this architecture assuming zero-forcing dirty paper coding at the base station, neglecting the direct links from the base station to the users, and with certain structure in the relay. These bounds are used to motivate an implementable multiuser precoding strategy that combines Tomlinson-Harashima precoding at the base station and linear signal processing at the relay, adaptive stream selection, and QAM modulation. Reduced complexity algorithms based on the sum rate lower bounds are used to select a subset of users. We compare the sum rates achieved by the proposed system architecture and algorithms with the sum rate upper bound and the sum rate achieved by the decode-and-forward relaying.