Integration of NOMA with Reflecting Intelligent Surfaces: A Multi-cell Optimization with SIC Decoding Errors

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Khan, Wali Ullah (author)

Integration of NOMA with Reflecting Intelligent Surfaces : A Multi-cell Optimization with SIC Decoding Errors

Article/chapterEnglish2023

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Institute of Electrical and Electronics Engineers (IEEE),2023
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LIBRIS-ID:oai:DiVA.org:kth-337545
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337545URI
https://doi.org/10.1109/TGCN.2023.3263121DOI

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Language:English
Summary in:English

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QC 20231009
Reflecting intelligent surfaces (RIS) has gained significant attention due to its high energy and spectral efficiency in next-generation wireless networks. By using low-cost passive reflecting elements, RIS can smartly reconfigure the signal propagation to extend the wireless communication coverage. On the other hand, non-orthogonal multiple access (NOMA) has been proven as a key air interface technique for supporting massive connections over limited resources. Utilizing the superposition coding and successive interference cancellation (SIC) techniques, NOMA can multiplex multiple users over the same spectrum and time resources by allocating different power levels. This paper proposes a new optimization scheme in a multi-cell RIS-NOMA network to enhance the spectral efficiency under SIC decoding errors. In particular, the power budget of the base station and the transmit power of NOMA users while the passive beamforming of RIS is simultaneously optimized in each cell. Due to objective function and quality of service constraints, the joint problem is formulated as non-convex, which is very complex and challenging to obtain the optimal global solution. To reduce the complexity and make the problem tractable, we first decouple the original problem into two sub-problems for power allocation and passive beamforming. Then, the efficient solution of each sub-problem is obtained in two-steps. In the first-step of For power allocation sub-problem, we transform it to a convex problem by the inner approximation method and then solve it through a standard convex optimization solver in the second-step. Accordingly, in the first-step of passive beamforming, it is transformed into a standard semi-definite programming problem by successive convex approximation and different of convex programming methods. Then, penalty based method is used to achieve a Rank-1 solution for passive beamforming in second-step. Numerical results demonstrate the benefits of the proposed optimization scheme in the multi-cell RIS-NOMA network.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Signalbehandling hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Signal Processing hsv//eng
non-orthogonal multiple access
Reflecting intelligent surfaces
signal decoding errors
spectral efficiency optimization

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Lagunas, Eva (author)
Mahmood, Asad (author)
Ali, Zain (author)
Asif, Muhammad (author)
Chatzinotas, Symeon (author)
Ottersten, Björn,1961-University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust, Luxembourg City, 1855, Luxembourg(Swepub:kth)u120hb53 (author)
University of Luxembourg, Interdisciplinary Centre for Security, Reliability and Trust, Luxembourg City, 1855, Luxembourg (creator_code:org_t)

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In:IEEE Transactions on Green Communications and Networking: Institute of Electrical and Electronics Engineers (IEEE)7:3, s. 1554-15652473-2400

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