Abstract
The limiting effect of multi-user interference from an adjacent cell upon the relays used for cooperative transmission is considered in the context of legacy networks which adopt max(min(·,·)) type relay selection policies. We extend previous work which considered single relay selection to the selection of two or four such relays, as is required in distributed space–time coding. We obtain new analytical expressions for outage probability over Rayleigh frequency flat fading channels for two signal-to-noise ratio regimes. We confirm by simulation that such a relay selection scheme has robustness to relay selection feedback error and outperforms a single relay selection scheme.
Highlights
Cooperative relaying can be considered as an effective method to combat fading by exploiting spatial diversity [1], and as a way for two users with no or weak direct connection to attain a robust link
In [10], exact outage and diversity performance expressions for a single relay selection scheme are provided for a wide range of signal-to-noise ratio (SNR) regimes in the context of an AF transmission protocol
It is difficult to use (5) to find a closed form expression for the probability density function (PDF) of γD, for high SNR, we provide an asymptotic bound as γD
Summary
Cooperative relaying can be considered as an effective method to combat fading by exploiting spatial diversity [1], and as a way for two users with no or weak direct connection to attain a robust link. In [10], exact outage and diversity performance expressions for a single relay selection scheme are provided for a wide range of signal-to-noise ratio (SNR) regimes in the context of an AF transmission protocol. This study was extended in [12] to obtain outage-optimal opportunistic relaying in the context of selecting a single relay from a set of N available relays They show that cooperative diversity gain is achieved even when certain relays remain inactive. Using a single best relay is not always sufficient to satisfy the required outage probability at a destination node These works have not considered feedback error for relay selection, which means sometimes the best relay cannot be chosen because the wrong enable feedback information is received from the destination node. ΓINFi = γS Ri = |hS Ri |2Es/N0 denotes the interference-to-noise ratio (INR) for the ith relay as a result of the neighboring source. Our two- or fourrelay selection scheme assuming interference only at the relays will be implemented as presented
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