Influence of Independent Phase Noises on MIMO-OFDM Systems
PENG Cong①② XU Peng③ CHEN Xiang② ZHAO Ming③
①(Shenzhen Institute of Information and Technology, Shenzhen 518172, China) ②(EDA Key Laboratory, Tsinghua-Shenzhen Research Institute, Shenzhen 518057, China) ③(Research Institute of Information Technology, Tsinghua University, Beijing 100084, China)
Abstract：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.
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