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On the Effect of Outdated Channel Estimation in Variable
Gain
Relaying: Error Performance and PAPR
Abstract
For the conventional three-node amplify-andforward (AF) relaying
setup, we
investigate the effect of imperfect channel state information
(CSI) at the relay on the
overall performance. In particular, we consider variable gain
(a.k.a, CSIassisted) AF
relaying and derive expressions for the outage and the error
probability for the case
where the relay gain is adjusted based on outdated estimates of
the source-relay
channel, when operating over Nakagami-mfading. For the case of
Rayleigh fading in
the source-relay link, we show that the results can be extended
to the versatile case of
imperfect CSI, where the estimation error is caused either by
additive white Gaussian
noise or by quantization noise. The obtained expressions are
functions of the correlation
coefficient between the actual source relay channel and its
corresponding estimate. We
also optimize the power allocation for minimization of the
outage probability under a
total transmits power constraint. Numerical results reveal a
considerable degradation of
the overall performance, when CSI acquisition is not perfect.
Moreover, it is shown that
the average relay transmit power is affected when the CSI is
outdated, a fact which
impacts the design of variable gain relaying in practice. Since
outdated CSI leads to
fluctuations of the relay transmit power, we derive expressions
for the complementary
cumulative distribution function (CCDF) of the
peak-to-average-power ratio (PAPR) at
the relay.
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ZEBROS PROJECTS
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0th Review 1st Review
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![PAPR analysis in Wavelet Packet Modulationmatthieugautier.free.fr/media/Gautier_ISCCSP_08.pdf · PAPR reduction techniques [2]-[5] have been proposed to reduce the PAPR problem in](https://img.pdfslide.us/doc/110x75/603d707e6c45f80b6138be06/papr-analysis-in-wavelet-packet-modul-papr-reduction-techniques-2-5-have-been.jpg)
