Modeling and Analysis of Two-Way Relay Non-Orthogonal Multiple Access Systems

被引:112
|
作者
Yue, Xinwei [1 ]
Liu, Yuanwei [2 ]
Kang, Shaoli [3 ,4 ]
Nallanathan, Arumugam [2 ]
Chen, Yue [2 ]
机构
[1] Beihang Univ, Sch Elect & Informat Engn, Beijing 100083, Peoples R China
[2] Queen Mary Univ London, Sch Elect Engn & Comp Sci, London E1 4NS, England
[3] Beihang Univ, Sch Elect & Informat Engn, Beijing 100083, Peoples R China
[4] China Acad Telecommun Technol, State Key Lab Wireless Mobile Commun, Beijing 100191, Peoples R China
基金
国家高技术研究发展计划(863计划); 英国工程与自然科学研究理事会;
关键词
Imperfect SIC; non-orthogonal multiple access (NOMA); two-way relay; PERFORMANCE ANALYSIS; 5G SYSTEMS; NETWORKS; SELECTION; PROTOCOLS;
D O I
10.1109/TCOMM.2018.2816063
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A two-way relay non-orthogonal multiple access (TWR-NOMA) system is investigated, where two groups of NOMA users exchange messages with the aid of one half-duplex decode-and-forward relay. Since the signal-plus-interference-tonoise ratios of NOMA signals mainly depend on effective successive interference cancellation (SIC) schemes, imperfect SIC (ipSIC), and perfect SIC (pSIC) are taken into account. In order to characterize the performance of TWR-NOMA systems, we first derive closed-form expressions for both exact and asymptotic outage probabilities of NOMA users' signals with ipSIC/pSIC. Based on the derived results, the diversity order and throughput of the system are examined. Then, we study the ergodic rates of users' signals by providing the asymptotic analysis in high signal-to-noise ratio (SNR) regimes. Finally, numerical simulations are provided to verify the analytical results and show that: 1) TWR-NOMA is superior to TWR-OMA in terms of outage probability in low SNR regimes; 2) due to the impact of interference signal at the relay, error floors and throughput ceilings exist in outage probabilities, and ergodic rates for TWR-NOMA, respectively; and 3) in delay-limited transmission mode, TWR-NOMA with ipSIC and pSIC have almost the same energy efficiency. However, in delay-tolerant transmission mode, TWR-NOMA with pSIC is capable of achieving larger energy efficiency compared with TWR-NOMA with ipSIC.
引用
收藏
页码:3784 / 3796
页数:13
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