MIMO-OFDM系统中一种新的有限反馈及调度方法

A Novel Limited Feedback and Scheduling Method in MIMO-OFDM Systems

在多输入多输出正交频分复用(MIMO-OFDM)系统中,利用OFDM子载波信道的相关性,将子载波动态关联分组,并对每一子载波,用所关联子载波上的波束进行匹配,获得更准确的信道方向信息,提高平均系统流量.再对子载波分组的信道状态信息采用有限反馈,供基站进行用户调度,减少了上行反馈信息量,提高了上行反馈效率.仿真表明,该方法的上行反馈信息量约为子载波独立有限反馈时的30%,平均系统流量超过模拟反馈信干噪比时的1%.

In MIMO-OFDM systems, opportunistic beam-forming needs a heavy uplink feedback load. A novel limited feedback and scheduling method was proposed aiming at this problem. The method aggregates sub-carriers with correlation. Each sub-carrier is matched with the beams of correlated sub-carriers so that a more exact CDI （channel direction information） is obtained to increase the average system throughput. Limited feedback is used to feedback channel state information of sub-carrier groups to decrease the uplink feedback load. The simulation shows that the method can achieve 1% more throughput compared with that using analog SINR feedback, with only about 30% feedback load of sub-carrier inde- pendently limited feedback.