Cache-Aided Non-Orthogonal Multiple Access: The Two-User Case

Journal article

Publication Details

Author(s): Xiang L, Ng DWK, Ge X, Ding Z, Wong VWS, Schober R
Journal: IEEE Journal of Selected Topics in Signal Processing
Publication year: 2019
Volume: 13
Journal issue: 3
Pages range: 436-451
ISSN: 1932-4553


In this paper, we propose a cache-aided non-orthogonal multiple access (NOMA) scheme for spectrally efficient downlink transmission. The proposed scheme not only reaps the benefits associated with NOMA and caching, but also exploits the data cached at the users for interference cancelation. As a consequence, caching can help to reduce the residual interference power, making multiple decoding orders at the users feasible. The resulting flexibility in decoding can be exploited for improved NOMA detection. We characterize the achievable rate region of cache-aided NOMA and derive the Pareto optimal rate tuples forming the boundary of the rate region. Moreover, we optimize cacheaided NOMA for minimization of the time required for completing file delivery. The optimal decoding order and the optimal transmit power and rate allocation are derived as functions of the cache status, the file sizes, and the channel conditions. Simulation results confirm that, compared to several baseline schemes, the proposed cache-aided NOMA scheme significantly expands the achievable rate region and increases the sum rate for downlink transmission, which translates into substantially reduced file delivery times.

FAU Authors / FAU Editors

Schober, Robert Prof. Dr.-Ing.
Lehrstuhl für Digitale Übertragung

External institutions with authors

Huazhong University of Science & Technology
University of British Columbia
University of Luxembourg
University of Manchester
University of New South Wales (UNSW)

How to cite

Xiang, L., Ng, D.W.K., Ge, X., Ding, Z., Wong, V.W.S., & Schober, R. (2019). Cache-Aided Non-Orthogonal Multiple Access: The Two-User Case. IEEE Journal of Selected Topics in Signal Processing, 13(3), 436-451.

Xiang, Lin, et al. "Cache-Aided Non-Orthogonal Multiple Access: The Two-User Case." IEEE Journal of Selected Topics in Signal Processing 13.3 (2019): 436-451.


Last updated on 2019-18-06 at 18:08