On Downlink NOMA in Heterogeneous Networks with Non-Uniform Small Cell Deployment

Tao Han, Jie Gong, Xiong Liu, S. M.Riazul Islam, Qiang Li, Zhiquan Bai, Kyung Sup Kwak

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Compared to orthogonal multiple access (OMA), non-orthogonal multiple access (NOMA) can achieve higher spectral efficiency by exploiting the power domain multiplexing. In this paper, we investigate the performance of NOMA in a two-tier heterogeneous network (HetNet) with non-uniform small cell deployment, where critical performance metrics like coverage probability and achievable rate are analyzed. First, a NOMA-based HetNet model is established, where users are paired based on the proposed user pairing scheme. Then the distribution of the order statistics for the distances between different NOMA users and the serving base station (BS) is presented considering the channel qualities from the NOMA users to the BSs. On this basis, we analytically demonstrate the impact of various network parameters on the coverage probability and achievable rate of NOMA users, such as signal-to-interference-plus-noise ratio threshold and BS density. Furthermore, an analysis is presented to provide insight into the energy efficiency of the considered system. Finally, extensive simulation and comparisons are conducted, which validate the advantages of NOMA over OMA in the considered HetNet environment.
Original languageEnglish
Article number8375949
Pages (from-to)31099-31109
Number of pages11
JournalIEEE Access
Early online date8 Jun 2018
Publication statusPublished - 26 Jun 2018
Externally publishedYes


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