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Cell-Free Massive MIMO-NOMA Systems With Imperfect SIC and Non-Reciprocal Channels

2021; Institute of Electrical and Electronics Engineers; Volume: 10; Issue: 6 Linguagem: Inglês

10.1109/lwc.2021.3066042

2162-2345

Aline Ohashi, Daniel Benevides da Costa, André L. P. Fernandes, Waldeir Monteiro, Ruan Victor Pereira Failache, André Cavalcante, João C. W. A. Costa,

Energy Harvesting in Wireless Networks

In this letter, we investigate the impact of non-reciprocities in cell-free massive MIMO with non-orthogonal multiple access (NOMA). To this end, closed-form expressions for the users' spectral efficiency (SE) are derived assuming pilot contamination, imperfect successive interference cancellation (SIC), and non-reciprocal channels. Based on the attained expressions, illustrative numerical examples are plotted for a scenario with 100 APs covering an area of 1 km 2 with 20 users. Our results show that under mismatches and imperfect SIC, NOMA still outperforms OMA, providing a good SE gain, especially for 40% worst likely users, increasing the user fairness.