Performance Analysis of Opportunistic Relaying Over Imperfect Non-identical Log-normal Fading Channels

Motivated by the fact that full diversity order is achieved using the "best-relay" selection technique, we consider opportunistic amplify-and-forward and decode-and-forward relaying systems. We focus on the outage probability of such a systems and then derive closed-form expressions for the outage probability of these systems over independent but non-identical imperfect Log-normal fading channels. We consider the error of channel estimation as a Gaussian random variable. As a result the estimated channels distribution are not Log-normal either as would be in the case of the Rayleigh fading channels. This is exactly the reason why our simulation results do not exactly matched with analytical results. However, this difference is negligible for a wide variety of situations.Comment: IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Toronto, ON, Canada, September 11-14, 201

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