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

Author(s): Kim, Kyeong Jin; Liu, Hongwu; Lei, Hongjiang; Ding, Zhiguo; Orlik, Philip V; et al

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Abstract: 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 near-far 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 cyclic-prefixed single carrier transmissions. To maximize a far user’s rate and two users’ sum rate over independently but non-identically distributed frequency selective fading channels and under a near-far user pairing constraint, we first derive closed-form expressions for the rates of the two users with full CSIT. Considering that only partial CSIT is available, a new RRH assignment and power allocation scheme is proposed for dCDD-Pseudo-NOMA. For various simulation scenarios, the provided link-level simulations verify that higher rates can be achieved by dCDD-Pseudo-NOMA compared with 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-Pseudo-NOMA achieve almost the same rate as that of ideal dCDD-Pseudo-NOMA which requires full CSIT.
Publication Date: 23-Oct-2020
Citation: Kim, Kyeong Jin, Liu, Hongwu, Lei, Hongjiang, Ding, Zhiguo, Orlik, Philip V, Poor, H Vincent. (2021). A dCDD-Based Transmit Diversity Scheme for Downlink Pseudo-NOMA Systems. IEEE Transactions on Wireless Communications, 20 (2), 1217 - 1232. doi:10.1109/twc.2020.3031809
DOI: doi:10.1109/twc.2020.3031809
ISSN: 1536-1276
EISSN: 1558-2248
Pages: 1217 - 1232
Type of Material: Journal Article
Journal/Proceeding Title: IEEE Transactions on Wireless Communications
Version: Author's manuscript

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