Performance of multiple relay selection with QoS requirement for cooperative relay networks

This paper investigates the performance of the multiple relay selection scheme where more than one relay participates in the relaying. We consider a network consisting of one source node, one destination node and several relay nodes, which are used to aid communication between source and destination. With the help of order statistics, the performance of the system is analyzed. By deriving probability density function (PDF) and cumulative density function (CDF) of the receive signal, the outage probability, bit error ratio (BER) and capacity of the system are obtained. With these results, a quality-of-service (QoS) based multiple relay selection scheme is proposed such that the number of selected relays is simply determined by the QoS constraint and transmit signal-to-noise ratio (SNR). All analytical results are validated via Monte Carlo simulation.