Multi-Antenna Two-Way Relay Based Cooperative NOMA

In this paper, we investigate a non-orthogonal multiple access (NOMA) assisted multi-antenna two-way relay system, where multi-antenna users apply NOMA to support bidirectional superposition transmission via multiple multi-antenna relays. Specifically, we propose two cooperative strategies, namely m...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2020-10, Vol.19 (10), p.6486-6503
Main Authors: Lv, Lu, Ye, Qiang, Ding, Zhiguo, Li, Zan, Al-Dhahir, Naofal, Chen, Jian
Format: Article
Language:English
Subjects:
Antennas
cooperative diversity
joint antenna-and-relay selection
Mathematical analysis
multi-antenna techniques
NOMA
Non-orthogonal multiple access
Nonorthogonal multiple access
outage probability
Power system reliability
Probability
Relay systems
Relays
Reliability analysis
Resource management
Time division
two-way relay
Wireless communication
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Summary:In this paper, we investigate a non-orthogonal multiple access (NOMA) assisted multi-antenna two-way relay system, where multi-antenna users apply NOMA to support bidirectional superposition transmission via multiple multi-antenna relays. Specifically, we propose two cooperative strategies, namely multiple-access broadcast NOMA and time division broadcast NOMA. For each of the two cooperative strategies, we devise a joint antenna-and-relay selection scheme to enhance the transmission reliability. Analytical expressions for the outage probability and diversity order are derived to evaluate the system performance achieved by the proposed cooperative strategies with the corresponding joint antenna-and-relay selection schemes. To further reduce the outage probability, we use the derived analytical results as objective functions to optimize the transmit power allocation under both cooperative strategies. Finally, extensive simulations are carried out to validate the accuracy of the derived analytical results. Our simulation results indicate that the proposed strategies significantly outperform existing benchmark strategies in terms of outage probability and diversity order.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2020.3003615