IEEE Transactions on Wireless Communications
Error performance of transmit beamforming with delayed and limited feedback
IEEE Transactions on Wireless Communications
A simple distributed antenna processing scheme for cooperative diversity
IEEE Transactions on Communications
A performance study of dual-hop transmissions with fixed gain relays
IEEE Transactions on Wireless Communications
MIMO Configurations for Relay Channels: Theory and Practice
IEEE Transactions on Wireless Communications
Distributed beamforming and power allocation for cooperative networks
IEEE Transactions on Wireless Communications - Part 2
IEEE Transactions on Wireless Communications - Part 2
An overview of limited feedback in wireless communication systems
IEEE Journal on Selected Areas in Communications
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In relay networks, partial channel state information at the transmitter due to feedback delay can severely degrade the beamforming performance. In this paper, the decremental effect of transmit beamforming with feedback delay on the downlink performance of a two hop Amplify-and-Forward (AF) relay network over Rayleigh fading channels is investigated. The source is equipped with multiple antennas while the relay and the destination has a single antenna. We have derived closed-form expressions for the outage probability, probability density function of the received signal-to-noise ratio (SNR) at the destination and the average bit error rate (BER). To gain further insights, outage probability and average BER approximations at high SNR are also presented. Numerical results supported by simulations are provided to illustrate the decremental effects feedback delay on the performance of the considered AF relay system.