A MIMO-NOMA Framework with Complex-Valued Power Coefficients - Archive ouverte HAL
Article Dans Une Revue IEEE Transactions on Vehicular Technology Année : 2019

A MIMO-NOMA Framework with Complex-Valued Power Coefficients

Résumé

This article proposes a widely linear processing(WLP) framework for multiple-input multiple-output nonorthogonalmultiple access (MIMO-NOMA) downlink systems.In the framework, a widely linear MIMO-NOMA (WL-MIMONOMA)model is derived by assuming that the base station(BS) transmits real-valued downlink signals. WL-MIMO-NOMAadopts complex-valued power allocation coefficients to staggerthe user signals in phase. The main features of WL-MIMONOMAare the following: (I) In general case, WL-MIMO-NOMAcan remove all the inter-cluster interference and at least halfof the intra-cluster interference; (II) In user pairing case, bothinterferences can be completely eliminated. This is distinct fromthe existing work where real power coefficients are used, whichcan’t guarantee the complete separation of the paired user signalsbecause the signals transmitted to the paired users are overlappedin phase. In addition, the closed-form expressions of outageprobabilities are derived. The phase difference of the complexpower coefficients is optimized to minimize the outage probability.It is proven that, with the optimal phase difference, successiveinterference cancellation (SIC) is unnecessary in user pairingcase. Finally, the framework is extended to the mixed case ofreal/complex circular signals. Simulation results show that theproposed framework outperforms the existing work, and thenumerical results agree well with the analytical analysis.

Dates et versions

hal-01980297 , version 1 (14-01-2019)

Identifiants

Citer

Di Tong, Yuehua Ding, Yonggui Liu, Yide Wang. A MIMO-NOMA Framework with Complex-Valued Power Coefficients. IEEE Transactions on Vehicular Technology, 2019, 68 (3), pp.2244-2259. ⟨10.1109/TVT.2018.2890546⟩. ⟨hal-01980297⟩
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