Outage probability and channel capacity for the Nth best relay selection AF relaying over INID Rayleigh fading channels

Abstract

SUMMARY Cooperative diversity systems have recently been proposed as a way to form virtual antenna schemes without utilizing collocated multiple antennas. In this paper, we consider the Nth best opportunistic amplify‐and‐forward (AF) cooperative diversity systems. The AF type can be regarded as one on the basis of modified channel state information. Wireless channels between any pair of nodes (i.e., direct and dual hop links) are assumed quasi‐static independent and nonidentically distributed (INID) Rayleigh fading. The best opportunistic AF (OAF) scheme requires two phases of transmission. During the first phase, the source node transmits a signal to all relays and the destination. In the second phase, the best relay is only selected on the basis of highest signal‐to‐noise ratio (SNR) scheme to forward the source signal to the destination. Therefore, the indirect link (i.e., source‐selected relay destination) can give the highest received SNR. However, the best relay selection cannot be available so that we might choose the second, third, or generally the Nth best relay. In this paper, we derive the approximated outage probability and channel capacity for the Nth best OAF relay systems over INID Rayleigh fading channels. At first, the indirect link's received SNR is approximated as harmonic mean upper bound. With this information, we obtain the given relay's Nth best selection probability as the closed form. Finally, both outage probability and channel capacity are derived as the closed forms. Simulation results are finally presented to validate the analysis. Copyright © 2011 John Wiley & Sons, Ltd.

Best relay selection for underlay cognitive relaying networks over Weibull fading channels

“…In [7], OP of dual-hop DF and amplify-and-forward (AF) relaying systems with multiple interferences over Rayleigh fading channels have been investigated. OP performance of partial relay selection in dual-hop AF relaying systems over Rayleigh fading channels are discussed in [8], and in [9] N th best opportunistic AF cooperative diversity systems are evaluated over i.n.i.d. Rayleigh fading channels.…”

Average Error Rate Expressions for DF relay Networks with CE Error for PSA-CE schemes Over Rayleigh Fading Channels

“…The advantages of general cooperative diversity schemes come at the expense of the spectral efficiency since the source and all the relays must transmit on orthogonal channels (i.e., different time slots or frequency bands) in order to avoid interfering with each other as well [2]. Recent researches are carried out for relay-selection schemes in which only two channels are need (one for the direct link and the other one for best relay link) [5][6][7][8]. However, they need to additional process or feedback information for channel states.…”

Effects of CEE on ASER performance for Cooperative AF Relay Systems with PSA-CE Schemes

“…In the former, the relay node transmits the received signals from both the source and the destination at the same time. In the latter, the single-relay node is selected so that only two channels are need (one for the direct link and the other for the selected indirect link) [5][6][7][8]. However, they need to additional process or feedback information for channel states.…”