MIMO-OFDM系统中各天线独立相位噪声的影响  

Influence of Independent Phase Noises on MIMO-OFDM Systems

作　　者：彭聪 许鹏[3] 陈翔[2] 赵明[3] 

机构地区：[1]深圳信息职业技术学院,深圳518172 [2]深圳清华大学研究院深圳市EDA重点实验室,深圳518057 [3]清华大学信息技术研究院,北京100084

出　　处：《电子与信息学报》2017年第12期2999-3003,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61501527);广州市协同创新科技专项;深圳市基础研究基金~~

摘　　要：随着无线通信频段的不断提高,非理想载波所引入的相位噪声对OFDM系统正交性的破坏也越来越不容忽视。与此同时,受天线间距离等实际因素的限制,发送或接收端的天线间可能无法共用载波时钟,导致不同天线上的相位噪声互相独立。该文在各天线独立的相位噪声的假设下,得出了MIMO-OFDM系统各子流检测误差的自相关矩阵的近似表达式,其中公共相位误差(CPE),载波间干扰(ICI)和热噪声的影响具有可加性,且对于CPE和ICI二者而言,收发相位噪声的影响也近似可加。上述理论推导的合理性通过计算机仿真得以验证。With the actually used frequency band going higher and higher in wireless communications, the influence of phase noise induced by imperfect carrier on OFDM systems can no longer be ignored. At the same time, the restrictions on the antenna spacing may make it impossible for different antennas to share the same carrier clock. In a MIMO-OFDM system with independent phase noises on different antennas, the approximate expression of error covariance matrix for demodulated data streams is given, and it is shown that the influence of CPE, ICI and additive noise are additive and independent of each other; besides, for both CPE and ICI, the influence of phase noises induced by the transmitter or the receiver are additive and independent of each other too. The validity of the theoretical deduction is verified by numerical simulation.

关 键 词：多输入多输出正交频分复用 相位噪声 公共相位误差(CPE) 载波间干扰(ICI) 

分 类 号：TN92[电子电信—通信与信息系统]