Abstract
By minimizing the outage probability, optimization is carried out in this paper to find joint optimal power allocation (OPA) and relay placement (ORP) for multihop relay networks adopting Hybrid Automatic Repeat reQuest (HARQ). Different from previous works, the joint OPA and ORP is analysed under generalized fading channels with the constraint on total transmit power, end-to-end relaying distance and maximum transmission number (delay). The simulation results demonstrate that for different fixed number of nodes and fading models, there are preferred deployments depending on path loss exponent and power retransmission strategy. By employing multiple retransmission round which can improve the reliability and energy efficiency without significant overhead, the end-to-end outage probability is no longer bounded by that of the weaker hop, i.e., the hop with a poor channel condition. The proposed strategy provides a dramatic improvement for the end-to-end outage probability by compensating the channel difference.
Highlights
Multihop Hybrid-automatic repeat request (HARQ) relay networks, which combined the advantage of multihop relay and HARQ techniques, have great potential to improve the performance of wireless networks due to their ability to improve the reliability and efficiency of transmission
By modeling the retransmission number of a packet from source to destination as delay, the e2e outage probability is derived under generalized fading channels and will be employed as the performance metric in the system optimization
This paper has addressed the problem of joint optimization of optimal power allocation (OPA) and ORP of a multihop relay networks adopting HARQ
Summary
Multihop Hybrid-automatic repeat request (HARQ) relay networks, which combined the advantage of multihop relay and HARQ techniques, have great potential to improve the performance of wireless networks due to their ability to improve the reliability and efficiency of transmission. By minimizing the outage probability of a decode-and-forward (DF) MIMO relay system with orthogonal space-time block coding, [3] shows that relay position optimization improves the finite-SNR (signal-to-noise ratio) diversity gain of a relay system whose adjacent hops have different diversity orders (unbalanced system). These studies show that joint optimization outperforms separate optimization significantly by improving the coding gain and diversity order. By modeling the retransmission number of a packet from source to destination as delay, the e2e outage probability is derived under generalized fading channels and will be employed as the performance metric in the system optimization. Due to the versatile and flexible features of generalized fading, it is worthy to note that the generalized fading channel has the advantage of including various fading models such as Hoyt, Nakagami- m , and Rician fading as special cases [6]
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