Hybrid NOMA/OMA With Buffer-Aided Relay Selection in Cooperative Networks
| Autor: | George K. Karagiannidis, Risto Wichman, Themistoklis Charalambous, Demosthenes Vouyioukas, Nikolaos Nomikos |
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| Přispěvatelé: | University of Aegean, Distributed and Networked Control Systems, Aristotle University of Thessaloniki, Risto Wichman Group, Department of Electrical Engineering and Automation, Aalto-yliopisto, Aalto University |
| Rok vydání: | 2019 |
| Předmět: |
TRANSMISSION
Computer science Hybrid NOMA/OMA POWER cooperative diversity DIVERSITY 02 engineering and technology BA relays PERFORMANCE ANALYSIS law.invention Noma SYSTEMS DOWNLINK Robustness (computer science) Relay law 0202 electrical engineering electronic engineering information engineering medicine RESOURCE-ALLOCATION Electrical and Electronic Engineering ta213 business.industry NOMA 020206 networking & telecommunications Spectral efficiency Outage probability medicine.disease spectral efficiency relay selection OPPORTUNITIES OUTDATED CSI Channel state information Diversity gain Signal Processing business Internet of Things NONORTHOGONAL MULTIPLE-ACCESS Computer network |
| Zdroj: | IEEE Journal of Selected Topics in Signal Processing. 13:524-537 |
| ISSN: | 1941-0484 1932-4553 |
| DOI: | 10.1109/jstsp.2019.2894059 |
| Popis: | Non-orthogonal multiple access (NOMA) aims to increase the spectral efficiency of fifth generation networks by relaxing the orthogonal use of radio-resources. In this paper, a network with multiple half-duplex buffer-aided (BA) relays is considered, where the source transmits with a fixed rate toward two users. The users might demand the same rate by the source (e.g., two cellular users requiring the same service), or they could have different rate requirements (e.g., a cellular user coexisting with an Internet of Things device). By deploying multiple BA relays, increased reliability and additional degrees of freedom are provided. Leveraging the spectral efficiency of NOMA and the increased diversity gain of BA relaying, two relay selection algorithms with broadcasting are proposed for power-domain NOMA and hybrid NOMA/OMA, namely BA-NOMA and BA-NOMA/OMA, respectively. BA-NOMA can improve the performance in terms of the outage probability when the power allocation factor α is selected such that robustness against channel uncertainties due to, e.g., outdated channel state information is provided. Moreover, BA-NOMA/OMA further improves the sum-rate by switching to OMA when the relays cannot serve the users through NOMA. For both cases, a theoretical analysis for the outage probability is conducted and the asymptotic performance is studied. Finally, numerical results and comparisons with other state-of-the-art algorithms are provided for the outage probability, average throughput, and average delay. |
| Databáze: | OpenAIRE |
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