Dual Relay Selection for Cooperative NOMA With Distributed Space Time Coding

We consider a two-user multi-relay cooperative non-orthogonal multiple access (NOMA) network with distributed space-time coding. Two dual-relay selection strategies are proposed for cooperative NOMA, namely, two-stage dual relay selection with fixed power allocation (DRS-FPA) and two-stage dual rela...

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Vydáno v:IEEE access Ročník 6; s. 20440 - 20450
Hlavní autoři: Zhao, Jing, Ding, Zhiguo, Fan, Pingzhi, Yang, Zheng, Karagiannidis, George K.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Piscataway IEEE 01.01.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Coding
Cooperative non-orthogonal multiple access
Encoding
NOMA
Nonorthogonal multiple access
outage performance
Power system reliability
Probability
Relay
relay selection
Relays
Resource description framework
Resource management
space time coding
Upper bounds
ISSN:2169-3536, 2169-3536
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Shrnutí:We consider a two-user multi-relay cooperative non-orthogonal multiple access (NOMA) network with distributed space-time coding. Two dual-relay selection strategies are proposed for cooperative NOMA, namely, two-stage dual relay selection with fixed power allocation (DRS-FPA) and two-stage dual relay selection with dynamic power allocation (DRS-DPA). Furthermore, lower and upper bounds on the outage probability for the DRS-FPA scheme and the exact outage probability for the DRS-DPA scheme are obtained in closed-form, respectively. Numerical results show that the proposed two-stage DRS schemes not only yield better outage performance than the existing single relay selection schemes without sacrificing spectral efficiency, but can also achieve full diversity gain.
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ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2820146