Codebook Design and Power Allocation for Distributed Space Time Codes

Recently, distributed antenna system (DAS) has received considerable attentions due to its promising potential in various metrics compared with traditional co-located MIMO (C-MIMO) systems. Aiming to further improve the performance of the DAS, linear precoding along with distributed space time codes is proposed to exploit the diversity and coding gains simultaneously. The focus of this paper is on analyzing and designing a simple but powerful codebook suitable for the DAS to quantize the precoding information. Furthermore, a suboptimal power allocation strategy that requires no additional information at the base station (BS), is derived by minimizing the upper bound on the average pairwise error probability (PEP) of the preceded space time codewords. Numerical results show that obvious gains can be obtained over conventional transmission schemes, such as antenna selection.