Reference : Cache-Aided Nonorthogonal Multiple Access: The Two-User Case
Scientific journals : Article
Engineering, computing & technology : Electrical & electronics engineering
Security, Reliability and Trust
Cache-Aided Nonorthogonal Multiple Access: The Two-User Case
Xiang, Lin mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > >]
Ng, Derrick Wing Kwan []
Ge, Xiaohu []
Ding, Zhiguo []
Wong, Vincent W.S. []
Schober, Robert []
IEEE Journal on Selected Topics in Signal Processing
Yes (verified by ORBilu)
[en] Non-orthogonal multiple access (NOMA) ; Caching ; Achievable rate region ; Radio resource allocation ; Convex and Nonconvex optimization ; Pareto optimality
[en] 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 cancellation. 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 cache-aided 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.
FNR CORE projects ROSETTA (11632107) and ProCAST (grant R-AGR-3415-10)
FnR ; FNR11632107 > Lei Lei > ROSETTA > Resource Optimization for Integrated Satellite-5G Networks with Non-Orthogonal Multiple Access > 01/09/2018 > 31/08/2021 > 2017

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