Exploiting Direct Links in Multiuser Multirelay SWIPT Cooperative Networks with Opportunistic Scheduling
Autor: | Nhu Tri Do, Beongku An, Daniel Benevides da Costa, Vo Nguyen Quoc Bao, Trung Q. Duong |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Mathematical optimization
business.industry Computer science Applied Mathematics Real-time computing Monte Carlo method ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020206 networking & telecommunications 020302 automobile design & engineering 02 engineering and technology Data_CODINGANDINFORMATIONTHEORY Computer Science Applications Scheduling (computing) 0203 mechanical engineering Channel state information Diversity gain Telecommunications link 0202 electrical engineering electronic engineering information engineering Computer Science::Networking and Internet Architecture Wireless Electrical and Electronic Engineering business Communication channel Computer Science::Information Theory |
Zdroj: | Do, N T, da Costa, D B, Duong, Q, Bao, V N Q & An, B 2017, ' Exploiting Direct Links in Multiuser Multirelay SWIPT Cooperative Networks with Opportunistic Scheduling ', IEEE Transactions on Wireless Communications . https://doi.org/10.1109/TWC.2017.2710307 |
DOI: | 10.1109/TWC.2017.2710307 |
Popis: | In this paper, we analyze the downlink outage performance of opportunistic scheduling in dual-hop cooperative networks consisting of one source, multiple radio-frequency energy harvesting relays, and multiple destinations. To this end, two low-complexity, suboptimal, yet efficient, relay-destination selection schemes are proposed, namely direct links plus opportunistic channel state information (CSI)-based selection (DOS) scheme and direct links plus partial CSI-based selection (DPS) scheme. Considering three relaying strategies, i.e., decode-and-forward (DF), variable-gain amplify-and-forward (VG-AF), and fixed-gain amplify-and-forward (FG-AF), the performance analysis in terms of outage probability (OP) is carried out for each selection scheme. For the DF and VG-AF strategies, exact analytical expressions and tight closed-form approximate expressions for the OP are derived. For the FG-AF strategy, an exact closed-form expression for the OP is provided. Additionally, we propose a gradient-based search method to find the optimal values of the power-splitting ratio that minimizes the attained OPs. The developed analysis is corroborated through Monte Carlo simulation. Comparisons with the optimal joint selection scheme are performed and it is shown that the proposed schemes significantly reduce the amount of channel estimations while achieving comparable outage performance. In addition, regardless of relaying strategy used, numerical results show that the DOS scheme achieves full diversity gain, i.e., $M+K$ , and the DPS scheme achieves the diversity gain of $M+1$ , where $M$ and $K$ are the numbers of destinations and relays, respectively. |
Databáze: | OpenAIRE |
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