关键词: 长期演进, 干扰避免, 调度, 正交补空间, 公平性

Abstract:

For avoiding severe performance degradation led by the inter-cell interference (ICI) in OFDMA systems with the frequency factor 1, the distributed coordination algorithm (CO-OCS) and coordination proportional fairness algorithm (PF-OCS) based on orthogonal complement space are proposed. The CO-OCS algorithm chooses the right regular vector of the user channel as the beamforming vector and the row span as an interference space from the left regular vectors of the interference channels. A suitable user lying in the orthogonal complement space of the interference space is scheduled to be free of suffering inter-cell interference and aggravating the interference in neighboring cells. The PF-OCS algorithm takes the fairness into account in scheduling. The CO-OCS algorithm gives a higher frequency efficiency and expands the system capacity. The PF-OCS algorithm can achieve almost 50％ the cell edge performance gain at the cost of 6％ cell throughput degradation than the CO-OCS algorithm.

Key words: long term evolution, interference avoidance, schedule, orthogonal complement space, fairness