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Title: Partial and opportunistic relay selection with outdated channel estimates
Authors: Soysa, M.
Suraweera, H.A.
Tellambura, C.
Garg, H.K. 
Keywords: amplify-and-forward
error performance
outage probability
outdated channel state information
Relay selection
Issue Date: Mar-2012
Citation: Soysa, M., Suraweera, H.A., Tellambura, C., Garg, H.K. (2012-03). Partial and opportunistic relay selection with outdated channel estimates. IEEE Transactions on Communications 60 (3) : 840-850. ScholarBank@NUS Repository.
Abstract: This paper investigates the impact of using outdated channel estimates for relay selection and signal amplification on the performance of amplify-and-forward (AF) relays under partial relay selection (PRS) and opportunistic relay selection (ORS). In practice, outdated channel state information (CSI) can occur due to feedback or scheduling delay. Both variable gain (VG) AF and fixed gain AF schemes are considered. Outage probability, the average bit error rate (BER) and simplified high signal-to-noise ratio approximations are derived. The effect of parameters such as the number of relays, the rank of chosen relay, and the correlation between the delayed and current channel state information are analyzed. Outdated CSI for computing relay gains in PRS causes about 2 dB loss. In ORS, a 3% reduction in correlation causes up to an order of magnitude increase in the outage probability. © 2012 IEEE.
Source Title: IEEE Transactions on Communications
ISSN: 00906778
DOI: 10.1109/TCOMM.2012.12.100671
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