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在保证一定吞吐量前提下,为了降低传输功率,文中提出了一种基于部分信道反馈信息的多用户OFDM系统子载波分配方案。该方案利用少量已反馈子载波的状态信息来线性推导未反馈子载波的信道增益。仿真结果表明,在平坦瑞利信道衰落中,相比传统方式该方案在不增加反馈开销的前提下该方案能够大幅度地改善系统的性能,提高资源利用率。
In order to reduce the transmission power, a subcarrier allocation scheme of multi-user OFDM system based on partial channel feedback is proposed in the premise of ensuring a certain throughput. The scheme uses the state information of a few feedback subcarriers to linearly deduce the channel gain of non-feedback subcarriers. Simulation results show that in the flat Rayleigh channel fading, compared with the traditional method, this scheme can greatly improve the system performance and improve the resource utilization without increasing the feedback overhead.