基于迫零检测的分布式发射天线V-BLAST OFDM系统中的载波频偏补偿
摘要
In Vertical Bell labs LAyered Space-Time (V-BLAST) Orthogonal Frequency Division Multiplexing (OFDM) systems with distributed transmit antennas, since the Caner Frequency Offsets (CFO) between the receiver and each transmit antenna are possibly different, the simple CRO compensation method used in conventional systems becomes invalid. Rather than the existing linear frequency-domain equalization method that involves computationally complex matrix inversions, we proposed a CRO compensation method without need for matrix inversion by exploiting the underlying characteristics of the Zero-Forcing (ZF) detection and assuming low delay spread of the multipath channel. Simulation results show that the Symbol Error Rate (SER) performance of the system is significantly improved by using the proposed CRO compensation method in the low delay spread cases of the three test environments in the ITU-R M. 1225 channel model.