The Benefits of Relay Selection in WiMAX Networks
نویسندگان
چکیده
In this work, we study the viability and potential gains of using a cooperative scheme in WiMAX networks. In particular, an opportunistic relay selection strategy is analyzed in a realistic scenario where the available channel state information is in general outdated. The analysis is performed in terms of outage probability, defined as the probability that instantaneous capacity is lower than a target rate. In particular, an analytical expression is derived in order to theoretically show under what conditions the cooperative scheme is advantageous. It is demonstrated that cooperation is not always beneficial unlike it is usually assumed. Cooperation causes a performance loose when the available channel state information is not sufficiently accurate and the number of relays is low. Simulation results corroborate these conclusions.
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