DocumentCode :
3494517
Title :
A virtual representation for time- and frequency-selective correlated MIMO channels
Author :
Sayeed, Akbar M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA
Volume :
4
fYear :
2003
fDate :
6-10 April 2003
Abstract :
A key to reliable communication is a fundamental understanding of the interaction between the signal space and the channel. In time- and frequency-selective MIMO (space-time) fading channels this interaction happens in time, frequency and space. In this paper we propose a four-dimensional Karhunen-Loeve-like virtual representation for space-time channels that captures the essence of such interaction and exposes the intrinsic degrees of freedom in the channel. The four dimensions are: time, frequency and the two spatial dimensions at the transmitter and receiver. The key signal space parameters are the signaling duration, bandwidth and the two array apertures. The corresponding channel parameters are the delay, Doppler and the two angular spreads associated with the scattering environment. The representation induces a virtual partitioning of propagation paths in time, frequency and space that reveals their contribution to channel capacity and diversity. It also exposes fundamental dependencies between time, frequency and space thereby revealing the essential degrees of freedom.
Keywords :
Doppler effect; Karhunen-Loeve transforms; MIMO systems; channel capacity; channel estimation; correlation theory; delay estimation; diversity reception; electromagnetic wave scattering; fading channels; radio receivers; radio transmitters; radiowave propagation; time-varying channels; Doppler spread; Karhunen-Loeve-like virtual representation; angular spreads; array apertures; bandwidth; channel capacity; channel parameters; correlated MIMO channels; degrees of freedom; delay; diversity; four-dimensional virtual representation; frequency-selective channels; propagation paths; receiver; reliable communication; scattering environment; signaling duration; space-time fading channels; time-selective channels; transmitter; virtual partitioning; Antenna arrays; Apertures; Bandwidth; Channel capacity; Delay; Fading; Frequency diversity; MIMO; Scattering parameters; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
ISSN :
1520-6149
Print_ISBN :
0-7803-7663-3
Type :
conf
DOI :
10.1109/ICASSP.2003.1202726
Filename :
1202726
Link To Document :
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