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An MMSE Strategy at Relays With Partial CSI for a Multi-Layer Relay Network

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Title An MMSE Strategy at Relays With Partial CSI for a Multi-Layer Relay Network
 
Creator ELAMVAZHUTHI, PS
DEY, BK
BHASHYAM, S
 
Subject MMSE
channel-state-information
multi-layer relay network
relay precoder
amplify-and-forward
AMPLIFY-AND-FORWARD
USER COOPERATION DIVERSITY
WIRELESS SENSOR NETWORKS
CAPACITY THEOREMS
PRECODER DESIGN
SYSTEM
 
Description We consider a relay network with a single source-destination pair and multiple layers of relays between them. We assume that these layers sequentially relay the signal transmitted by the source to the destination. Unlike existing work, we also assume that the destination and all the forward layers present between the transmitting layer and the destination receive signals during every transmission phase. We optimally combine these signals, say mu of them, using a precoder at each relay layer for onward transmission. We obtain this precoding matrix by minimizing the mean-squared error (MSE) at the relays, and do not require channel-state- information (CSI) of the forward channels at the relays unlike existing systems that minimize MSE at the destination and require CSI of the forward channels at the relays. Our closed-form solution for this matrix is valid for any K number of layers, whereas minimizing MSE at the destination does not have closed-form solution for K > 1. For K > 1, we enhance an existing scheme to obtain a sub-optimal closed-form precoder solution and use it for comparison. We show using simulations that our scheme approaches the bit-error-rate (BER) performance of this scheme, when mu is increased, even with partial CSI.
 
Publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
 
Date 2014-12-29T04:31:25Z
2014-12-29T04:31:25Z
2014
 
Type Article
 
Identifier IEEE TRANSACTIONS ON SIGNAL PROCESSING, 62(2)271-282
1053-587X
1941-0476
http://dx.doi.org/10.1109/TSP.2013.2284471
http://dspace.library.iitb.ac.in/jspui/handle/100/17082
 
Language English