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MMSE-beamforming for multi-user multiple-input multiple-output systems with distributed antennas

机译:具有分布式天线的多用户多输入多输出系统的MMSE波束成形

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In this paper, we study the optimum transceiver design of multi-user multiple-input multiple-output (MU-MIMO) systems with distributed antennas. The basestation in the system is equipped with multiple distributed antenna units (DAUs) spreading out at different locations in a service area, and they are connected to a central unit (CU) through high-throughput low-latency links such as optical fibers. In the downlink, signals for multiple users are first modulated and precoded at the CU, and are then forwarded to the DAUs, which broadcast the signals to all the users in the system. Each user extracts its own information with a linear filter. The beamforming precoder at the CU and the linear filters at the UEs are jointly designed to minimize the sum mean squared error (MSE) of all the users. The optimum designs are performed under two different power constraints: a constraint on the total power of all DAUs, and constraints on the power consumption of each DAU. Simulation results demonstrate that the performance of the proposed system improve with the number of DAUs and the number of UEs under both power constraints.
机译:在本文中,我们研究了带有分布式天线的多用户多输入多输出(MU-MIMO)系统的最佳收发器设计。系统中的基站配备有分布在服务区域中不同位置的多个分布式天线单元(DAU),并且它们通过高吞吐量,低延迟的链路(例如光纤)连接到中央单元(CU)。在下行链路中,多个用户的信号首先在CU上进行调制和预编码,然后转发到DAU,DAU将信号广播到系统中的所有用户。每个用户都使用线性过滤器提取自己的信息。 CU处的波束成形预编码器和UE处的线性滤波器共同设计为最小化所有用户的总均方误差(MSE)。最佳设计是在两种不同的功率约束下执行的:对所有DAU的总功率的约束,以及对每个DAU的功耗的约束。仿真结果表明,在两种功率约束下,提出的系统的性能均随着DAU的数量和UE的数量的增加而提高。

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