 Electrical and Electronic Engineering  Research Publications
Electrical and Electronic Engineering  Research Publications
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ItemCentralized Scheduling with SumRate optimization in Flexible HalfDuplex NetworksDayarathna, S ; Razlighi, M ; Senanayake, R ; Zlatanov, N ; Evans, J (IEEE, 202005)In this paper, we focus on maximization of the instantaneous sumrate in flexible halfduplex networks, where nodes have the flexibility to choose to either transmit, receive or be silent in a given time slot. Since the corresponding optimization problem is NPhard, we design lowcost algorithms that give suboptimal solutions with good performance. We first consider two existing approximation techniques to simplify the sumrate optimization problem: arithmeticgeometric means inequality and another utilising the tight lower bound approximation. We then propose a novel pattern search algorithm that performs close to exhaustive search but with significantly lower complexity. Comparing the performance of the proposed algorithm with respect to existing resource allocation techniques, we observe that our proposed algorithm provides significant sumrate gains.

ItemBinary Power Optimality for Two Link FullDuplex NetworkDayarathna, S ; Senanayake, R ; Evans, J (IEEE, 202005)In this paper, we analyse the optimality of binary power allocation in a network that includes fullduplex communication links. Considering a network with four communicating nodes, two of them operating in halfduplex mode and the other two in fullduplex mode, we prove that binary power allocation is optimum for the fullduplex nodes when maximizing the sum rate. We also prove that, for halfduplex nodes binary power allocation is not optimum in general. However, for the two special cases, 1) the low signaltonoiseplusinterference (SINR) regime and, 2) the approximation by the arithmetic meangeometric mean inequality, binary power allocation is optimum for the approximated sum rate even for the halfduplex nodes. We further analyse a third special case using a symmetric network for which the optimum power allocation is binary, under a sufficient condition. Numerical examples are included to illustrate the accuracy of the results.