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中文摘要：
以降低系统反馈为目标，提出一种在多天线下行系统基于信干比门限反馈的自适应传输策略。基于正交随机波束成形，提出仅当用户最大信干比超过门限时才将最大信干比和对应的波束序号反馈给基站，并给出了系统平均总速率与该信干比门限的关系表达式。仿真结果表明，通过选取有效的信干比门限，可在几乎不降低总速率的情况下，系统反馈极大降低。
英文摘要：
A novel adaptive resource allocation scheme based on signal to interference plus noise ratios（SINR） threshold is proposed to reduce the system feedback for MIMO downlink systems. Specially, based on orthonormal random beamforming（ORBF）, only when users maximum SINR is larger than SINR threshold, their maximum SINR and the index of beams are fed back to the base- station. And the relationship between SINR threshold and sum - rate is given. Simulation results show that the proposed scheme achieves greatly reduced feedback with almost the same sum- rate compared with ORBF by the proper SINR threshold.
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