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Title: A quasi-orthogonal group space-time architecture to achieve a better diversity-multiplexing tradeoff
Authors: Dai, Lin
Sfar, Sana
Letaief, K. B.
Keywords: Group detection
MIMO systems
Space-time block coding
Layered space-time
Quasi-orthogonal group space-time
Diversity-multiplexing tradeoff
Issue Date: 2005
Citation: Submitted to IEEE Transactions on Wireless Communications
Abstract: Most existing MIMO (Multiput-Input Multiput-Output) schemes optimize only either the diversity gain or the multiplexing gain. To obtain a good tradeoff between these two, the Quasi-Orthogonal Group Space-Time (QoGST) architecture is proposed, wherein the transmit stream is subgrouped but encoded via an inter-group space-time block encoder, with group interference suppression at the receiver. This paper also considers another combined space-time coding and layered space-time architecture, which we refer to as Group Layered Space-Time (GLST), where space-time block coding is employed within each group. Under the assumption of Rayleigh fading and a prior perfect channel state information at the receiver, a performance analysis will demonstrate that both QoGST and GLST can achieve a good diversity-multiplexing tradeoff. QoGST is even superior to GLST. Simulation results will validate our analysis and further show that compared to the existent Layered Space-Time Block Code (LSTBC) scheme, both QoGST and GLST can achieve a significant performance gain.
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