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中文摘要：
针对正交随机波束成型（ORBF）当系统用户少时性能下降严重的问题,提出一种基于ORBF的多用户多波束选择策略.其基本思想是针对ORBF选定的优化用户集再次反馈部分信道信息,使得在系统用户数较少时系统总速率得到有效提高,并对功率平均分配和自适应功率分配两种情况分别进行了分析.仿真结果表明,该策略在增加部分反馈信息和提高发射机复杂性的条件下,可极大地提高系统总速率.
英文摘要：
The performances of orthonormal random beamforming （ORBF） would be degraded severely when the numbers of system＇s users decrease. Proposed is a multi-user and multi-beam selection scheme, whose basic idea is to feedback more channel information to groupsr users identified by ORBF so that much more sum-rate could be achieved even with low number of users. Equal power allocation and adaptive power allocation among beams were analyzed respectively. The simulation results show that substantial gain could be achieved at the expense of more feedback channel state information and more complexity at the transmitter.
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