基于时变信道和射频非理想性补偿算法结合的大规模MIMO信道互易性研究

Massive MIMO Channel Reciprocity based on Combination of Time-Varying Channel and RF Non-Ideality Compensation Algorithm

信道时变性、射频器件非理想性是影响信道互易性的主要因素。目前,独立进行补偿的方法难以充分发挥大规模MIMO的优势。基于AR模型预测模型的信道时变性补偿算法和OTA(Over-The-Air)校准算法的射频非理想性补偿方法,提出了两种时变信道和射频非理想性补偿算法的结合方案,同时实现了补偿射频失真和信道时变造成的信道互易性损失。此外,基于3GPP信道模型,仿真了提出的结合方案。仿真结果表明,结合方案能有效补偿互易性损失,取到了良好效果。

Channel time variability and non-ideality of RF devices are the main factors affecting channel reciprocity. At present, it is difficult for independent compensation to make full use of the advantages of massive MIMO. In consideration of both the channel time variation compensation algorithm based on AR prediction model and radio frequency non-ideality compensation method based on OTA （Over-The-Air） calibration algorithm, a combination scheme of the two time-varying channels and RF non-ideality compensation algorithm is proposed, and meanwhile the compensation for channel-reciprocity loss caused by RF distortion and channel time variation is realized. In addition, based on the 3GPP channel model, the proposed combination scheme is simulated, and the simulation indicates that the combination scheme could effectively compensate reciprocity loss and achieve good results.