Switching between diversity and multiplexing in MIMO systems

Multiple-input multiple-output (MIMO) wireless communication systems can offer high data rates through spatial multiplexing or substantial diversity using transmit diversity. In this letter, switching between spatial multiplexing and transmit diversity is proposed as a simple way to improve the dive...

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Bibliographic Details
Published in:IEEE transactions on communications 2005-06, Vol.53 (6), p.962-968
Main Authors: Heath, R.W., Paulraj, A.J.
Format: Article
Language:English
Subjects:
Applied sciences
Channels
Coding, codes
Communication switching
Computer simulation
Criteria
Cultural differences
Error probability
Euclidean distance
Exact sciences and technology
Information, signal and communications theory
MIMO
Monte Carlo methods
Multiple-input multiple-output (MIMO) systems
Multiplexing
Radiocommunications
Receivers
Receiving antennas
Signal and communications theory
space-time coding
State feedback
Switching
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
transmit diversity
Transmitters
Transmitters. Receivers
Transmitting antennas
Wireless communication
Wireless communication systems
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Summary:Multiple-input multiple-output (MIMO) wireless communication systems can offer high data rates through spatial multiplexing or substantial diversity using transmit diversity. In this letter, switching between spatial multiplexing and transmit diversity is proposed as a simple way to improve the diversity performance of spatial multiplexing. In the proposed approach, for a fixed rate, either multiplexing or diversity is chosen based on the instantaneous channel state and the decision is conveyed to the transmitter via a low-rate feedback channel. The minimum Euclidean distance at the receiver is computed for spatial multiplexing and transmit diversity and is used to derive the selection criterion. Additionally, the Demmel condition number of the matrix channel is shown to provide a sufficient condition for multiplexing to outperform diversity. Monte Carlo simulations demonstrate improvement over either multiplexing or diversity individually in terms of bit error rate.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2005.849774