基于机会通信的多天线蜂窝系统小区间干扰协调

Inter-cell co-channel interference coordination based on opportunistic communication in multi-antenna cellular systems

通过研究有限反馈波束赋形蜂窝系统中小区间同信道干扰变化的特性,提出了一种基于机会通信的有限权值机会波束方法。该方法通过在预先设计的有限数量的赋形权值码本中随机选择赋形权值,使目标小区的干扰变化与邻小区用户调度无关,从而使干扰测量和速率预测更为准确,降低了反馈时延和干扰变化造成的中断率。理论分析和仿真均表明:采用正比公平调度的有限权值机会波束与有限反馈波束赋形具有相近的发射速率,从而系统吞吐量得到提高。

Considering the characteristic of co-channel interference based on limited feedback beamforming in cellular systems,opportunistic beamforming method with limited number of weights is proposed.By choosing beamforming vector randomly from a pre-designed codebook,the variation of desired interference is non-user specific.As a result,more precise interference measurement and rate prediction could be achieved,and outage probability due to feedback delay and fluctuation of interference is decreased.Both theoretical analysis and simulation results indicate that the transmit rate of the proposed method with proportional fair scheduling is similar to that of limited feedback beamforming,and further system throughput is increased.