Nonregenerative MIMO Relaying with Optimal Transmit Antenna Selection
Steven W. Peters, Robert W. Heath Jr
TL;DR
This paper develops optimal antenna selection strategies for nonregenerative MIMO relay channels, improving communication efficiency with limited feedback and comparing performance to other beamforming methods.
Contribution
It introduces SNR-based optimal antenna selection rules for source and relay in nonregenerative MIMO relays, with practical feedback schemes.
Findings
Optimal antenna selection outperforms other beamforming techniques in BER.
The proposed methods require only limited feedback from the destination.
The approach is computationally tractable and practical for real systems.
Abstract
We derive optimal SNR-based transmit antenna selection rules at the source and relay for the nonregenerative half duplex MIMO relay channel. While antenna selection is a suboptimal form of beamforming, it has the advantage that the optimization is tractable and can be implemented with only a few bits of feedback from the destination to the source and relay. We compare the bit error rate of optimal antenna selection at both the source and relay to other proposed beamforming techniques and propose methods for performing the necessary limited feedback.
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