Efficient Adaptive Relaying Protocols Analysis for Wireless Cooperative Networks with Channel Estimation Errors

摘要

This work investigates the performance of Adaptive Decode-amplify-and-forward (ADAF) relaying 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.