Abstract
We propose a robust beamforming design for non-orthogonal multiple access-based multiple-input single-output downlink systems. In particular, the robust power minimization problem is studied with imperfect channel state information, where the beamformers are designed by incorporating norm-bounded channel uncertainties to provide the required quality of service at each user. This robust scheme is developed based on the worst-case performance optimization framework. In terms of beamforming vectors, the original robust design is not convex; therefore, the robust beamformers cannot be obtained directly. To circumvent this non-convex issue, the original intractable problem is reformulated into a convex problem, where the non-convex constraint is converted into a linear matrix inequality by exploiting S-Procedure. Simulation results are provided to demonstrate the effectiveness of the proposed robust design.
| Original language | English |
|---|---|
| Article number | 7922522 |
| Pages (from-to) | 2033-2036 |
| Number of pages | 4 |
| Journal | IEEE Communications Letters |
| Volume | 21 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2017 |
Bibliographical note
Funding Information:Manuscript received February 8, 2017; revised March 23, 2017 and April 14, 2017; accepted April 25, 2017. Date of publication May 9, 2017; date of current version September 8, 2017. The work of all authors was supported by H2020-MSCARISE-2015 under grant number 690750. The associate editor coordinating the review of this paper and approving it for publication was L. Dai. (Corresponding author: Faezeh Alavi.) F. Alavi, K. Cumanan, and A. G. Burr are with the Department of Electronic Engineering, University of York, York YO10 5DD, U.K. (e-mail: [email protected]).
Publisher Copyright:
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Keywords
- multiple-input single-output (MISO)
- Non-orthogonal multiple access (NOMA)
- robust beamforming
- worst-case performance optimization