Optimum Linear Detection of a Modified V-BLAST System with Delay Offsets

In [1], a modified Vertical-Bell Labs layered space- time (V-BLAST) system has been proposed, where different delay offsets are intentionally applied to the spatially multiplexed data streams. Compared with the conventional synchronous V- BLAST system, the modified system with only a simple linear detection under zero-forcing(ZF) criterion can achieve M_r th- order diversity(where M_r is the number of receive antennas), therefore giving a reasonable tradeoff between complexity and performance. In this paper, we focus on how to find the optimum linear detection of the Modified V-BLAST Systems. Simulations demonstrate that the optimum linear detection is superior to the ZF detection algorithm used in [Shihai Shao et al., 2007], especially when the number of transmit antennas is large.