2 research outputs found
Performance Analysis of Bidirectional Relay Selection with Imperfect Channel State Information
In this paper, we investigate the performance of bidirectional relay
selection using amplify-and-forward protocol with imperfect channel state
information, i.e., delay effect and channel estimation error. The asymptotic
expression of end-to-end SER in high SNR regime is derived in a closed form,
which indicates that the delay effect causes the loss of both coding gain and
diversity order, while the channel estimation error merely affects the coding
gain. Finally, analytical results are verified by Monte-Carlo simulations.Comment: Submitted to IEEE Transactions on Communications, 17 pages, 4 figure
Performance of Opportunistic Fixed Gain Bidirectional Relaying With Outdated CSI
This paper studies the impact of using outdated channel state information for
relay selection on the performance of a network where two sources communicate
with each other via fixed-gain amplifyand- forward relays. For a Rayleigh faded
channel, closed-form expressions for the outage probability, moment generating
function and symbol error rate are derived. Simulations results are also
presented to corroborate the derived analytical results. It is shown that
adding relays does not improve the performance if the channel is substantially
outdated. Furthermore, relay location is also taken into consideration and it
is shown that the performance can be improved by placing the relay closer to
the source whose channel is more outdated