Differential Space-Time Modulation for Modified V-BLAST System

Abstract

This paper proposes a differential en/decoding scheme for the modified Vertical-Bell Labs layered space-time (V-BLAST) system, where each spatially multiplexed data stream is intentionally inserted with delay offset. The proposed scheme can use only one receive antenna to detect the transmitted signals, whereas neither the transmitter nor the receiver knows the channel state information (CSI). Simulation results show that the bit error rate (BER) performance is nonidentical when different delay offsets are applied. The optimum delay offset for two transmit antennas system, for example, is about 0.6 TS (where Ts denotes symbol period) when the system achieves better performance.