Two-Way MIMO Relaying Systems Employing Layered Relay-and-Antenna Selection Strategies

In this paper, a variety of layered relay-and-antenna selection (LRAS) strategies are developed for the two-way multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying systems in the presence of spatial correlation between antennas over fading channels. On the basis of the achievable...

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Bibliographic Details
Published in:IEEE systems journal 2018-03, Vol.12 (1), p.854-861
Main Authors: Hu, Chia-Chang, Chen, Bo-Hung
Format: Article
Language:English
Subjects:
Amplify-and-forward (AF)
Antennas
Approximation algorithms
Codes
Complexity
Computation
Computer simulation
Correlation
Covariance matrices
Eigenvalues and eigenfunctions
MIMO
MIMO (control systems)
multiple-input multiple-output (MIMO)
relay
Relay systems
relay-and-antenna selection (RAS)
Relaying
Relays
Search algorithms
spatial correlation
two-way
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Summary:In this paper, a variety of layered relay-and-antenna selection (LRAS) strategies are developed for the two-way multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying systems in the presence of spatial correlation between antennas over fading channels. On the basis of the achievable sum-rate (ASR) maximization, the condition number (CN), adaptive discrete stochastic approximation (A-DSA), Gram-Schmidt (GS), and squared Frobenius norm (SFN)-based LRAS algorithms are investigated under an equal power allocation. To reduce the computational complexity of the relay-and-antenna selection (RAS) selection strategies, the best single relay and the subset of transmit-and-receive (Tx/Rx) antenna pairs are selected and separated into a two-stage manner. Remarkably, the LRAS techniques enable to alleviate substantially the computational complexity incurred by an exhaustive-mode RAS search algorithm. Finally, simulation results demonstrate the excellent sum-rate capacity of the proposed LRAS methods over other existing selection ones for MIMO two-way multiple-AF-relay systems.
ISSN:1932-8184
1937-9234
DOI:10.1109/JSYST.2016.2527715