摘要
针对基于正交频分复用(OFDM)的未来移动通信系统中的蜂窝覆盖所面临的下行小区间干扰问题,提出了一种基于子载波组的自适应干扰抑制算法.该算法根据干扰和信道情况,自适应调整子载波组空间波束方向、自适应选取传输性能较好的子载波组、自适应调整每个子载波组的调制阶数和扩频倍数,在满足数据传输误码率要求的同时,使数据传输速率最大.仿真结果显示:该算法很好地抑制了相邻小区的干扰,并自适应多径衰落信道(IMT2000步行A信道)的变化;当接收点空间信干比在-3 dB以上变化时,该算法在保证误码率要求的同时,使数据传输速率最大.
The downlink intercell area covery would be interfered severely in orthogond freguency division multiplexing （OFDM）-mobile communication system. On the basis of subcarrier-cluster, an adaptive downlink intercell interference suppressing algorithm was proposed. In the algorithm, the beamforming of the subcarrier-cluster was adaptively adjusted, well-performed subcarrier-cluster was selected, and the modulation scheme and spread spectrum scheme of the subcarrier-cluster were adjucted according to the interference and the channel change. The simulation result shows that the algorithm can suppress the interference from neighbor cells could be suppressed and the subcarrier-cluster be adaptively adjusted according to the interference and the channel change by this algorithm, to maximize the transmission data rate while to meet the desired bit error ratio.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期12-15,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(60171013)
关键词
正交频分复用
子载波组
干扰抑制
IMT2000信道
orthogond freguency division multiplexing （OFDM）
subcarrier-cluster
interference avoidance and suppressing
IMT2000 channel
