大规模MIMO-OFDM系统中的同相/正交支路不平衡问题及其补偿方法研究

项目名称： 大规模MIMO-OFDM系统中的同相/正交支路不平衡问题及其补偿方法研究

项目编号： No.61501254

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 梁彦

作者单位： 南京邮电大学

项目金额： 19万元

中文摘要： 大规模MIMO-OFDM系统具有频谱效率高、发射功率低和抗干扰能力强等诸多优势，是极具吸引力的未来移动通信备选方案。由于采用大量体积小、成本低、功耗低的天线，大规模MIMO-OFDM系统中的同相与正交支路（IQ）不平衡问题较为严重，是制约系统性能的一个重要因素。IQ不平衡影响下的大规模MIMO-OFDM系统数学模型维数巨大，这使得该环境下IQ不平衡问题的研究难度增大。本项目将针对大规模MIMO-OFDM系统中的IQ不平衡问题，分析其对系统性能的影响程度，系统性地研究其补偿方法。基于IQ不平衡影响下的大规模MIMO-OFDM系统模型及广义信道模型特点，提出计算复杂度低且易于实现的IQ不平衡参数与无线信道估计、信道互易性校准以及IQ不平衡补偿方法，有效地抑制IQ不平衡对大规模MIMO-OFDM系统性能的不利影响，为推进大规模MIMO-OFDM系统的发展及商业化提供有力的技术支撑。

中文关键词： 同相/正交支路不平衡；大规模MIMO；OFDM；信道估计；IQ不平衡补偿

英文摘要： The massive MIMO-OFDM system, with the advantages of high frequency spectrum efficiency, low transmit power and strong interference resistance ability, is an attractive alternative for the future wireless communication. However, equipped with lots of low-area, cost and power consumption antennas, the massive MIMO-OFDM system is with severe problem of in-phase and quadrature-phase imbalances, which degrades the system performance. The mathematical model of massive MIMO-OFDM system with IQ imbalances is of huge dimension, leading to difficulty in the research of IQ imbalances. So in this project, the impact of IQ imbalances on the performance of massive MIMO-OFDM systems will be analyzed and its compensation methods will be comprehensively investigated. Based on the characteristics of the system model and the general channel model of massive MIMO-OFDM with IQ imbalances, the algorithms of IQ imbalance and channel estimation, channel reciprocity calibration and IQ imbalance compensation with low computational complexity will be proposed, in order to mitigate the negative impact of IQ imbalances on the massive MIMO-OFDM system and provide strong technical support to the development and commercialization of massive MIMO-OFDM system.

英文关键词： IQ imbalance;massive MIMO;OFDM;channel estimation ;compensation of IQ imbalance