Spatial Precoder Design for SpaceTime Coded MIMO Systems Based on Fixed Parameters of MIMO.pdf

Spatial Precoder Design for Space-Time Coded MIMO Systems: Based on Fixed Parameters of MIMO Channels Tharaka A. Lamahewa, Rodney A. Kennedy, Thushara D. Abhayapala, Van K. Nguyen Abstract— In this paper, we introduce the novel use of linear by these works, [3–5] have proposed several modulation and spatial precoding based on fixed and known parameters of coding schemes, namely space-time trellis codes and space- multiple-input multiple-output (MIMO) channels to improve the time block codes, to exploit the potential increase in capacity performance of space-time coded MIMO systems. We derive linear spatial precoding schemes for both coherent (channel and diversity gains using multi antenna arrays with coherent 5 is known at the receiver) and non-coherent (channel is un- detection. 0 known at the receiver) space-time coded MIMO systems. Antenna The effectiveness of these coherent space-time coding 0 spacing and antenna placement (geometry) are considered as schemes mainly relies on the accuracy of the channel es- 2 fixed parameters of MIMO channels, which are readily known timation at the receiver. Therefore, differential space-time at the transmitter. These precoding schemes exploit the antenna c coding (DSTC) schemes proposed in [6–8] make an attractive e placement information at both ends of the MIMO channel to D ameliorate the effect of non-ideal antenna placement on the alternative to combat inaccuracy of channel estimation in performance of space-time coded systems. In the