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Joint User Pairing and Power Allocation with Compressive Sensing in NOMA Systems

Authors:
Nasser, A. ,  Muta, O. ,  Gacanin, H.
Journal:
IEEE Wireless Communications Letters
Volume:
10
Page(s):
1-1
number:
1
Date:
Jan. 2021
ISSN:
2162-2345
DOI:
10.1109/LWC.2020.3023619
hsb:
RWTH-2020-09999
Language:
English

Abstract

In this letter, we propose a novel low-complexity user pairing (UP) and power allocation (PA) technique utilizing the compressive sensing (CS) theory for non-orthogonal multiple access (NOMA) systems. In the proposed scheme, we formulate the joint UP and PA optimization problem in NOMA systems as a relaxed sparse l1-norm problem, based on the fact that a limited, i.e.‘, sparse’, number of users has to be paired among a large number of users over a dedicated resource block (RB). By exploiting this inherent sparsity property, we can obtain a near-optimal solution by relaxing the original NP-hard problem of joint UP and PA. Then, a CS technique is proposed to find a solution for the relaxed problem. Simulation results validate the effectiveness of our proposed idea regarding the sum-rate and the reduced complexity compared to the state-of-the-art schemes.

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