基于有限反馈的MIMO系统自适应调制
doi: 10.3724/SP.J.1146.2006.00659
Adaptive Modulation for MIMO System Based on Limited Feedback
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摘要: 该文利用信道的特征矢量，将MIMO高斯信道转化成混合信道，结合功率分配给出了自适应调制方案，使系统容量在发射功率和服务质量约束下达到最大。发射端所需的波束成形和功率分配等信息利用有限的比特反馈到发射端。仿真结果表明：在小信噪比的情况下，该自适应调制方案对系统容量有明显改善。Abstract: The MIMO channel is changed into the mixture channel using the eigenvector of the channel matrix. The adaptive modulation together with power allocation is studied in order to maximize the system capacity under the constraint of total transmit power and Quality of Service (QoS). The information needed at the transmitter such as beamforming vector and power allocation vector is conveyed back using limited feedback. The simulation results show that the proposed scheme can improve the capacity greatly at low SNR.
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