Cognitive Multi-Hop Multi-Branch Relaying: Spectrum Leasing and Optimal Power Allocation
Autor: | Parham Kazemi, Ali H. Bastami |
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Rok vydání: | 2019 |
Předmět: |
Mathematical optimization
business.industry Computer science Applied Mathematics Quality of service ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS 020206 networking & telecommunications 02 engineering and technology Computer Science Applications Hop (networking) law.invention Frequency allocation Spread spectrum Cognitive radio Relay law 0202 electrical engineering electronic engineering information engineering Wireless Electrical and Electronic Engineering business Communication channel |
Zdroj: | IEEE Transactions on Wireless Communications. 18:4075-4088 |
ISSN: | 1558-2248 1536-1276 |
Popis: | In this paper, for an overlay cognitive radio network in which the primary user’s transmission is assisted by a cognitive multi-hop multi-branch network, we propose and analyze a spectrum leasing scheme that achieves full diversity in both the primary and secondary networks. Among the available branches, the best one is selected to establish a multi-hop relay link between the primary users. In return, the secondary users of the selected branch are rewarded with a fraction of spectrum to transmit their own signals over a nonorthogonal multiple-access channel. We jointly optimize the branch selection and the spectrum allocation such that the sum-rate of the secondary users is maximized under the constraint that a minimum quality-of-service (QoS) requirement in terms of the achievable rate is satisfied in the primary network. We also optimize the power allocation to the secondary users such that the asymptotic outage probability of the primary network is minimized. The analytical results show that this spectrum leasing scheme guarantees the full diversity of order $M$ in both the primary and secondary networks, where $M$ is the number of cognitive branches. The simulation results also show that optimizing the allocation of power significantly decreases the risk of spectrum leasing failure. |
Databáze: | OpenAIRE |
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