Abstract:
In vertical Bell labs layered space-time (V-BLAST) orthogonal frequency division multiplexing (OFDM) systems with distributed transmit antennas, since the carrier frequency offsets (CFOs) between the receiver and each transmit antenna are possibly different, the effects of multiple CFOs should be taken into account in detection. This paper first proposes a low-complexity CFO correction method for low delay spread channels by exploiting the underlying characteristics of zero-forcing (ZF) detection; and then proposes a ZF based detection method involving two CFO correction processes by combining the proposed CFO correction method with the conventional one. Simulation results show that the proposed CFO correction method can effectively eliminate the effects of multiple CFOs in low delay spread channels; while in channels with larger delay spread the proposed detection method involving two CFO correction processes can further improve the system performance.