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Iterative Receivers for Downlink MIMO-SCMA: Message Passing and Distributed Cooperative Detection

Journal Article


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Abstract


  • IEEE The rapid development of the mobile communications requires ever higher spectral efficiency. The non-orthogonal multiple access (NOMA) has emerged as a promising technology to further increase the access efficiency of wireless networks. Amongst several NOMA schemes, the sparse code multiple access (SCMA) has been shown to be able to achieve better performance. In this paper, we consider a downlink MIMOSCMA system over frequency selective fading channels. For optimal detection, the complexity increases exponentially with the product of the number of users, the number of antennas and the channel length. To tackle this challenge, we propose near optimal low-complexity iterative receivers based on factor graph. By introducing auxiliary variables, a stretched factor graph is constructed and a hybrid belief propagation (BP) and expectation propagation (EP) receiver, named as & #x2018;Stretch-BP-EP & #x2019;, is proposed. Considering the convergence problem of BP algorithm on loopy factor graph, we convexify the Bethe free energy and propose a convergence-guaranteed BP-EP receiver, named as & #x2018;Conv-BP-EP & #x2019;. We further consider cooperative network and propose two distributed cooperative detection schemes to exploit the diversity gain, namely, belief consensus-based algorithm and Bregman alternative direction method of multipliers (ADMM)- based method. Simulation results verify the superior performance of the proposed Conv-BP-EP receiver compared with other methods. The two proposed distributed cooperative detection schemes can improve the bit error rate performance by exploiting the diversity gain. Moreover, Bregman ADMM method outperforms the belief consensus-based algorithm in noisy inter-user links.

UOW Authors


  •   Yuan, Wijie (external author)
  •   Wu, Nan (external author)
  •   Guo, Qinghua
  •   Li, Yonghui (external author)
  •   Xing, Chengwen (external author)
  •   Kuang, Jingming (external author)

Publication Date


  • 2018

Citation


  • W. Yuan, N. Wu, Q. Guo, Y. Li, C. Xing & J. Kuang, "Iterative Receivers for Downlink MIMO-SCMA: Message Passing and Distributed Cooperative Detection," IEEE Transactions on Wireless Communications, vol. 17, (5) pp. 3444-3458, 2018.

Scopus Eid


  • 2-s2.0-85043781537

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2381&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1379

Number Of Pages


  • 14

Start Page


  • 3444

End Page


  • 3458

Volume


  • 17

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • IEEE The rapid development of the mobile communications requires ever higher spectral efficiency. The non-orthogonal multiple access (NOMA) has emerged as a promising technology to further increase the access efficiency of wireless networks. Amongst several NOMA schemes, the sparse code multiple access (SCMA) has been shown to be able to achieve better performance. In this paper, we consider a downlink MIMOSCMA system over frequency selective fading channels. For optimal detection, the complexity increases exponentially with the product of the number of users, the number of antennas and the channel length. To tackle this challenge, we propose near optimal low-complexity iterative receivers based on factor graph. By introducing auxiliary variables, a stretched factor graph is constructed and a hybrid belief propagation (BP) and expectation propagation (EP) receiver, named as & #x2018;Stretch-BP-EP & #x2019;, is proposed. Considering the convergence problem of BP algorithm on loopy factor graph, we convexify the Bethe free energy and propose a convergence-guaranteed BP-EP receiver, named as & #x2018;Conv-BP-EP & #x2019;. We further consider cooperative network and propose two distributed cooperative detection schemes to exploit the diversity gain, namely, belief consensus-based algorithm and Bregman alternative direction method of multipliers (ADMM)- based method. Simulation results verify the superior performance of the proposed Conv-BP-EP receiver compared with other methods. The two proposed distributed cooperative detection schemes can improve the bit error rate performance by exploiting the diversity gain. Moreover, Bregman ADMM method outperforms the belief consensus-based algorithm in noisy inter-user links.

UOW Authors


  •   Yuan, Wijie (external author)
  •   Wu, Nan (external author)
  •   Guo, Qinghua
  •   Li, Yonghui (external author)
  •   Xing, Chengwen (external author)
  •   Kuang, Jingming (external author)

Publication Date


  • 2018

Citation


  • W. Yuan, N. Wu, Q. Guo, Y. Li, C. Xing & J. Kuang, "Iterative Receivers for Downlink MIMO-SCMA: Message Passing and Distributed Cooperative Detection," IEEE Transactions on Wireless Communications, vol. 17, (5) pp. 3444-3458, 2018.

Scopus Eid


  • 2-s2.0-85043781537

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2381&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1379

Number Of Pages


  • 14

Start Page


  • 3444

End Page


  • 3458

Volume


  • 17

Issue


  • 5

Place Of Publication


  • United States