Deconstructing multiantenna fading channels
IEEE Transactions on Signal Processing
Capacity scaling and spectral efficiency in wide-band correlated MIMO channels
IEEE Transactions on Information Theory
Capacity of MIMO systems based on measured wireless channels
IEEE Journal on Selected Areas in Communications
Capacity limits of MIMO channels
IEEE Journal on Selected Areas in Communications
Spatial multiplexing in correlated fading via the virtual channel representation
IEEE Journal on Selected Areas in Communications
Near-optimum detection with low complexity for uplink virtual MIMO systems
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
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A key to maximal exploitation of MIMO (multiple-input multiple-output) systems is a fundamental understanding of the interaction between the underlying complex physical scattering environment and the space-time signal space. In time- and frequency-selective MIMO (space-time) channels, this interaction happens in time, frequency and space. We present a four-dimensional Karhunen-Loeve-like virtual representation for space-time channels that captures such interaction and exposes the intrinsic degrees of freedom in the channel. The virtual representation is a Fourier series dictated by the finite array apertures, signaling duration and bandwidth and corresponds to a uniform, fixed sampling of the angle-delay-Doppler scattering space. It provides a much-needed connection between the two existing (extreme) modeling approaches - idealized statistical models and detailed physical (ray tracing) models. In particular, it yields a simple geometric interpretation of the effects of physical scattering on channel statistics and capacity. We discuss various insights into the structure of space-time channels afforded by the virtual representation as well its application in capacity assessment, spatial multiplexing and space-time code design.