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Training-Based MIMO Systems: Part I - Performance Comparison
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- Coldrey, Mikael, 1972 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Bohlin, Patrik, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
- (creator_code:org_t)
- 2005
- English.
- Reports (other academic/artistic)
Abstract
Subject headings
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- A simple and straightforward way of estimating the unknown communication channel is to transmit known training/pilot sequences. Conventionally, these non-information carrying pilots are time-multiplexed with the data and, therefore, consume valuable bandwidth. Hence in the recent past, a number of publications have instead suggested superimposing pilots to the data to perform channel estimation in, e.g., MIMO systems. However, the performance gain achieved by using superimposed pilots (SIP) compared to the more conventional time-multiplexedpilot scheme is not well studied and motivates further research. In this paper we attempt to make a fair comparison between the two schemes, their respective maximum information rate is computed and compared using lower bounds. The theory is applied to a block-wise flat-fading MIMO channel and it is found that in certain scenarios (such as many receive antennas and/or short channel coherence times), it is beneficial to use SIP. Finally, an abstract projection-based viewpoint of the training-based models using vector spaces is given.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Wireless communications
- channel estimation
- MIMO
- training
Publication and Content Type
- rap (subject category)
- vet (subject category)
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