This paper presents a brief overview of spacetime algorithms for communication systems operating in quasi-static Rayleigh flat fading environments.
Overview of Space-Time Wireless Communications in Quasi-Static Rayleigh Flat Fading Channels
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This paper presents a brief overview of spacetime algorithms for communication systems operating in quasi-static Rayleigh flat fading environments. The space-time algorithms exploit a multi-input multi-output (MIMO) channel and are designed to meet criteria for optimality under three different channel state information (CSI) conditions: 1) CSI at receiver and transmitter, 2) CSI at receiver but not transmitter, and 3) CSI at neither receiver or transmitter. We analyze the theoretical capacities of the MIMO channels and give the design criteria for space-time codes (STC) under each condition. We briefly describe Grassmannian beamforming (quantized beamforming), space-time block coding (STBC), space-time trellis coding (STTC), and unitary space-time modulation (USTM) for a 2 x 2 MIMO system operating at a spectral efficiency of 2 bps/Hz. We show through simulation the comparative performance of each of the space-time transmission schemes presented.