接收端配备滤波器的分布式波束形成技术

基于频率选择性信道中由一个发射节点、一个目标节点和多个中继节点构成的中继网络，该文提出一种新型的分布式波束形成技术。该技术除了在中继节点上采用滤波而后转发的中继数据中转策略之外，在接收节点也配备一个有限长响应(Finite Impulse Response, FIR)滤波器，共同均衡发射节点与中继节点以及中继节点与接收节点之间的频率选择性信道。该文中，此两种滤波器将得到联合优化以提高接收节点的服务质量，并同时满足中继节点的发射功率限制。仿真结果表明，相较于放大而后转发以及滤波而后转发但无接收滤波器的波束形成器而言，所提波束形成技术极大地提高了频率选择性信道中中继网络的性能。

Distributed Beamforming with Receive Filter

In this paper, a new distributed beamforming technique for relay networks in frequency selective channels is proposed. The relay network consists of one transmitter, multiple relays and one receiver. To equalize the transmitter-to-relay and relay-to-receiver frequency selective channels, a Finite Impulse Response (FIR) filter at the receiver is used in addition to employing Filter-and-Forward (FF) relaying strategy at the relays. The FIR filters at the relays and the receiver are designed jointly to maximize the receive quality-of-service subject to the constraint of total relay transmitted power. Simulation results demonstrate that the proposed beamforming technique outperforms both the amplify-and-forward based beamforming method and the FF based beamforming technique without receiver filtering in frequency selective fading environments.