Correction of multiple frequency offsets and detection in V-BLAST OFDM systems with distributed transmit antennas

Abstract

This paper addresses the correction of multiple carrier frequency offsets (CFO) and detection in vertical Bell Labs layered space-time (V-BLAST) orthogonal frequency division multiplexing (OFDM) systems with distributed transmit antennas. We first propose a low-complexity CFO correction method suitable for low delay spread channels by exploiting the underlying characteristics of zero-forcing (ZF) detection, and then propose a ZF based detection method involving two CFO correction processes to further improve its performance in the high delay spread case. Simulation results show that the proposed CFO correction method can effectively correct multiple CFOs in low delay spread channels, while for the high delay spread case the proposed detection method with two CFO correction processes can further improve the detection performance.