Sum-Rate Maximization of Rate-Splitting Multiple Access with Zero-Forcing Beamforming 


Vol. 45,  No. 9, pp. 1483-1492, Sep.  2020
10.7840/kics.2020.45.9.1483


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  Abstract

In this paper, we propose a jointly optimal beamforming and power allocation scheme to maximize the sum-rate for multi-antenna broadcast channels in which rate-splitting multiple access (RSMA) is applied. The key feature of RSMA is the split of the messages into common and private parts. Since, the number of variables that should be considered increases by splitting messages, joint optimization problem has high complexity and non-convexity. To tackle this problem, we simplify the expression of rate by applying zero-forcing to the private stream which removes interference between private streams. Furthermore, we propose a low complexity algorithm in which the optimization problems are simplified according to cases where an optimal solution can exist. In each case, the sum-rate is re-expressed as a concave or quasi-concave function and based on this function an optimal solution is derived. Finally, an optimal solution of the sum-rate maximization problem is derived by selecting the best solution from the solutions in each case. By comparing simulation results with conventional multiple access schemes and RSMA with the existing optimization method, it turns out that RSMA with the proposed algorithm has better performance in terms of the sum-rate.

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  Cite this article

[IEEE Style]

J. An, N. Ha, W. Shin, "Sum-Rate Maximization of Rate-Splitting Multiple Access with Zero-Forcing Beamforming," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1483-1492, 2020. DOI: 10.7840/kics.2020.45.9.1483.

[ACM Style]

Jihye An, Nohgyeom Ha, and Wonjae Shin. 2020. Sum-Rate Maximization of Rate-Splitting Multiple Access with Zero-Forcing Beamforming. The Journal of Korean Institute of Communications and Information Sciences, 45, 9, (2020), 1483-1492. DOI: 10.7840/kics.2020.45.9.1483.

[KICS Style]

Jihye An, Nohgyeom Ha, Wonjae Shin, "Sum-Rate Maximization of Rate-Splitting Multiple Access with Zero-Forcing Beamforming," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 9, pp. 1483-1492, 9. 2020. (https://doi.org/10.7840/kics.2020.45.9.1483)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880