New NOMA-Based Two-Way Relay Networks

被引:20
作者
Fang, Zhaoxi [1 ]
Shen, Shigen [1 ]
Liu, Jianhua [1 ]
Ni, Wei [2 ]
Jamalipour, Abbas [3 ]
机构
[1] Shaoxing Univ, Dept Comp Sci & Engnr, Shaoxing 312000, Zhejiang, Peoples R China
[2] CSIRO, Sydney, NSW 2122, Australia
[3] Univ Sydney, Sch Elect & Informat Engn, Camperdown, NSW 2006, Australia
基金
中国国家自然科学基金;
关键词
Relays; NOMA; Relay networks (telecommunication); Upper bound; Signal to noise ratio; Downlink; Resource management; Cooperative NOMA; two-way relay; amplify-and-forward; decode-and-forward; NONORTHOGONAL MULTIPLE-ACCESS; COORDINATED DIRECT; SELECTION;
D O I
10.1109/TVT.2020.3039286
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
Relays have been deployed to provide connectivity to heavily blocked and isolated radio environments, but suffer from severe data rate losses due to the half-duplex nature of relays. This paper exploits non-orthogonal multiple access (NOMA) to enhance the sum-rate of two heavily blocked users to and from a base station (BS) via two-way relays (TWRs). By carefully arranging the NOMA transmissions, only two time slots are needed to complete a round of two-way transmissions between the BS and the two users. Unlike existing works where users associated with the same relay form a NOMA pair, the two users are connected to two different relays in the proposed scheme, due to the blockage. We analyze the sum-rate of the proposed NOMA-based TWR scheme with two popular relaying modes, namely, amplify-and-forward (AF) and decode-and-forward (DF) relaying, and derive closed-form expressions for the sum-rate upper bounds of the scheme. We also analyze the asymptotic sum-rate of the NOMA-based TWR schemes in high signal-to-noise ratio (SNR) regions. Simulations verify the analysis, and show that the proposed schemes outperform existing TDMA-based alternatives and a NOMA-based benchmark scheme. It is shown that the sum-rate of the schemes is independent of the transmit power of the BS in the high SNR regions, given the transmit powers of the relays and users.
引用
收藏
页码:15314 / 15324
页数:11
相关论文
共 33 条
  • [1] 3GPP, 5G NR FRAM STRUCT
  • [2] Abramowitz M, 1968, Handbook of mathematical functions
  • [3] [Anonymous], 2018, 33843 3GPP TR
  • [4] The Application of Relay to Massive Non-Orthogonal Multiple Access
    Chen, Xiaoming
    Jia, Rundong
    Ng, Derrick Wing Kwan
    [J]. IEEE TRANSACTIONS ON COMMUNICATIONS, 2018, 66 (11) : 5168 - 5180
  • [5] Dai LL, 2015, IEEE COMMUN MAG, V53, P74, DOI 10.1109/MCOM.2015.7263349
  • [6] Joint User and Relay Selection for Cooperative NOMA Networks
    Deng, Dan
    Fan, Lisheng
    Lei, Xianfu
    Tan, Weiqiang
    Xie, Dongqing
    [J]. IEEE ACCESS, 2017, 5 : 20220 - 20227
  • [7] Cooperative Non-Orthogonal Multiple Access in 5G Systems
    Ding, Zhiguo
    Peng, Mugen
    Poor, H. Vincent
    [J]. IEEE COMMUNICATIONS LETTERS, 2015, 19 (08) : 1462 - 1465
  • [8] Ho CY, 2017, IEEE I C SIGNAL IMAG, P459, DOI 10.1109/ICSIPA.2017.8120655
  • [9] Joint Power Allocation for NOMA-Based Diamond Relay Networks With and Without Cooperation
    Huang, Bo-Ying
    Lee, Yinman
    Sou, Sok-Ian
    [J]. IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY, 2020, 1 (01): : 428 - 443
  • [10] Error Probability Analysis of NOMA-Based Diamond Relaying Network
    Kara, Ferdi
    Kaya, Hakan
    [J]. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 2020, 69 (02) : 2280 - 2285