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Power allocation for statistical qo s provisioning in opportunistic multi relay df
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Power Allocation for Statistical QoS Provisioning in
Opportunistic Multi-Relay DF Cognitive Networks
In this letter, we propose a power allocation scheme for statistical quality-of-service (QoS) provisioning
in multi-relay decode-and-forward (DF) cognitive networks (CN). By considering the direct link between
the source and destination, the CN first chooses the transmission mode (direct transmission or relay
transmission) based on the channel state information. Then, according to the determined transmission
mode, efficient power allocation will be performed under the given QoS requirement, the average
transmit and interference power constraints as well as the peak interference constraint. Our proposed
power allocation scheme indicates that, in order to achieve the maximum throughput, at most two relays
can be involved for the transmission. Simulation results show that our proposed scheme outperforms the
max-min criterion and equal power allocation policy.