Communication Dans Un Congrès Année : 2020

Joint SDMA and Power-Domain NOMA System for Multi-User Mm-Wave Communications

Résumé

Digital beamsteering (DBS) is an appealing technique to overcome the severe millimeter-wave path loss, with less complexity and less channel feedback. In multiuser systems, DBS generates a beam toward each user. However, in congested cells, such a system suffers from high inter-user interference causing by the neighboring beams. In this paper, a new approach of space division multiple access (SDMA) with power-domain non-orthogonal multiple access (PD-NOMA) is considered for millimeter-wave channel to significantly reduce the inter-user interference and thus enhance the overall throughput. The proposed scheme is designed by selecting the users located at the same direction to share one beam, in which PD-NOMA multiplexes the users in power domain. The proposed user clustering method built upon an interference metric, and followed by a fixed power allocation method based on the received power, makes possible the design of a low-feedback NOMA-DBS scheme. Simulation results, based on the New York university mm-wave simulator, show that the multiuser MIMO system can achieve higher sum-rate with our proposed joint SDMA and PD-NOMA scheme, with respect to only SDMA (e.g., up to 20 bps/Hz rate gain for 45 users in the cell).

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hal-02901840 , version 1 (17-07-2020)

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Israa Khaled, Charlotte Langlais, Ammar El Falou, Michel Jezequel, Bachar Elhassan. Joint SDMA and Power-Domain NOMA System for Multi-User Mm-Wave Communications. IWCMC 2020 : International Wireless Communications and Mobile Computing Conference, Jun 2020, Limassol, Cyprus. ⟨10.1109/IWCMC48107.2020.9148204⟩. ⟨hal-02901840⟩
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