摘要
针对OFDMA系统多小区上行链路资源分配问题,提出了一种新的基于基站合作(BSC)和软频率复用(SFR)的资源分配方案。该方案通过相邻小区使用不同的子载波的软频率复用减少小区间干扰,利用基站合作对边缘用户的信号重构,使小区间干扰进一步消除,从而将多小区资源分配转化为单一小区资源分配。然后根据选择子载波避免冲突原则进行第一次子载波分配。最后根据速率要求,在不影响其他用户最低速率要求的前提下,对子载波进行二次分配。分析和仿真结果表明,该方案可以很好地解决小区边缘干扰严重的问题,降低用户的中断率,使多小区资源分配更加简单、公平、有效,尤其可保证边缘用户的服务质量,从而改善了系统的性能。
A new resource allocation scheme based on base station cooperation （BSC） under soft frequency reuse （SFR） is pro- posed for the uplink of multi-cell orthogonal frequency division multiple access （OFDMA） systems. Firstly, the inter-cell inference （ICI） is decreased by using the SFR of different subcarriers in adjacent cells, meanwhile, and the base stations combine the interference users＇ signal to further efficiently mitigate ICI. Thus, the multi-cell resource allocation is trans- formed into the single-cell allocation. Secondly, the subcarriers are initially allocated by the channel gain under avoiding collision for each others. Thirdly, redistribution is accomplished on the premise of not influencing other users＇ rate tar- get. The analysis and the simulation results show that IC! can be efficiently mitigated and the outage ratio decreases quickly with SNR. Besides, the complexity of resource allocation is reduced and fairness is achieved. The proposed scheme guarantees QoS and improves system performance, especially for users at the cell boundary.
出处
《高技术通讯》
EI
CAS
CSCD
北大核心
2010年第12期1235-1240,共6页
Chinese High Technology Letters
基金
973计划(2007CB310601)
新一代宽带无线移动通信网科技重大专项(2009ZX03004-001)资助项目
