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中文摘要：
本文对协作式中继辅助的多输入多输出（Multiple—input Multiple—output，MIMO）通信中的联合波束成形问题进行了研究。首先推导了接收信噪比的下界，并基于该下界建立了联合波束成形的数学模型；然后推导了分布式波束成形的最优方案；最后设计了联合优化信源的多天线波束成形和协作式中继的分布式波束成形的算法，从而获得联合波束成形方案。计算机实验仿真表明所提联合波束成形方案获得明显的性能增益。
英文摘要：
The joint beamforming is investigated for the multiple-input multiple-output （MIMO） wireless communication systems enhanced by cooperative relays. Firstly, the lower bound of the received SNR at the destination is derived, which is treated as the cost function in the mathematical problem for the joint beamforming optimization. Then, the optimal distributed beamforming for the cooperative relays is acquired when the multiple-antenna beamforming of the source is fixed. Finally, an iterative algorithm is designed to optimize the multiple-antenna beamforming of the source and the distributed beamforming of the cooperative relays. Simulation results show that the proposed joint beamforming scheme outperforms the scheme of no relays＇ cooperation.
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