TR2020-176

A dCDD-Based Transmit Diversity Scheme for Downlink Pseudo-NOMA Systems


    •  Kim, K.J., Liu, H., Lei, H., Ding, Z., Orlik, P.V., Poor, H.V., "A dCDD-Based Transmit Diversity Scheme for Downlink Pseudo-NOMA Systems", IEEE Transactions on Wireless Communications, DOI: 10.1109/TWC.2020.3031809, Vol. 20, No. 2, pp. 1217-1232, December 2020.
      BibTeX TR2020-176 PDF
      • @article{Kim2020dec2,
      • author = {Kim, Kyeong Jin and Liu, Hongwu and Lei, Hongjiang and Ding, Zhiguo and Orlik, Philip V. and Poor, H. Vincent},
      • title = {A dCDD-Based Transmit Diversity Scheme for Downlink Pseudo-NOMA Systems},
      • journal = {IEEE Transactions on Wireless Communications},
      • year = 2020,
      • volume = 20,
      • number = 2,
      • pages = {1217--1232},
      • month = dec,
      • doi = {10.1109/TWC.2020.3031809},
      • url = {https://www.merl.com/publications/TR2020-176}
      • }
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  • Research Areas:

    Communications, Signal Processing

In this paper, a new transmit diversity scheme is proposed for cooperative pseudo-non-orthogonal multiple access (Pseudo-NOMA) without assuming full channel state information at the transmitter (CSIT). To support two users under the nearfar user pairing constraint, a distributed cyclic delay diversity (dCDD) scheme is adapted into NOMA by dividing a set of remote radio heads (RRHs) into two groups for multiple cyclicprefixed single carrier transmissions. To maximize a far user’s rate and two users’ sum rate over independently but nonidentically distributed frequency selective fading channels and under near-far user pairing constraint, we first derive the closedform expressions for the rate of two users with full CSIT. Considering that only partial CSIT is available, a new RRH assignment and power allocation scheme is proposed for dCDDPseudo-NOMA. For various simulation scenarios, the provided link-level simulations verify that the superior rate can be achieved by dCDD-Pseudo-NOMA over the traditional orthogonal multiple access with dCDD and dCDD-Conventional-NOMA that uses the superimposed signals. Furthermore, the proposed RRH assignment and power allocation scheme makes dCDD-PseudoNOMA achieves almost the same rate as that of ideal dCDDPseudo-NOMA which requires full CSIT.