OFDMA系统的信道质量信息反馈方案改进

Improvement of CQI Feedback Schemes Based on OFDMA System

在比较多种基于OFDMA(orthogonal frequency division multiple access)系统的信道质量信息(CQI)反馈方案性能的基础上,提出一种新的反馈改进方案.该方案在混合反馈方案的基础上,用减少反馈层数以降低反馈开销,同时,以增加每一层反馈资源块数量的方法来反馈信道信息.仿真结果表明,新的方案在不增加额外反馈比特开销的同时,提高了对信道描述的精确程度以及该方案在不同信道条件下应用的灵活程度.

In this paper, a new feedback scheme is presented based on comparison of several CQI feedback schemes using OFDMA（orthogonal frequency division multiple access）. The number of feedback levels is decreased, while the number of feedback resource block（RB） is increased in each level in order to enrich the feedback information of radio channel. Simulation shows that the new scheme enhances description precision of radio channel and flexibility when it is used under different channel conditions without additional bit cost as compared to some current schemes.