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| Efficient Adaptive Relaying Protocols Analysis for Wireless Cooperative Networks with Channel Estimation Errors |
| Doudou Samb, Li Yu |
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Abstract This work investigates the performance of Adaptive
Decode-amplify-and-forward (ADAF) relaying\linebreak protocol in
wireless multi-relay networks in presence of channel estimation
errors. Through statistical analyses, we obtain the received
Signal-to-noise-ratio (SNR) at the destination based on which we
establish a closed-form expression for the outage probability taking
into account the channel estimation errors. As the expression of the
outage probability is too complex, we then find an upper bound
approximation in high SNR and show the superiority of ADAF scheme
with respect to that one with fixed protocol at any error level. And
when the coefficient errors tend to zero as a special case, we show
that ADAF achieves a full diversity order for increasing the network
reliability. However, when the coefficient errors increase
independently to the SNR, an error floor is obtained as the SNR
becomes high leading to the outage probability be a constant which
reduces the diversity order to 0. In addition, simulations are
given to corroborate the analytical results.
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