QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS

JI Wei; ZHAO Yanan; LIU Ziqing; LI Ting; LIANG Yan; SONG Yunchao; LI Fei

doi:10.11999/JEIT220946

Volume 45 Issue 10

Oct. 2023

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Article Navigation > Journal of Electronics & Information Technology > 2023 > 45(10): 3603-3611

JI Wei, ZHAO Yanan, LIU Ziqing, LI Ting, LIANG Yan, SONG Yunchao, LI Fei. QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS[J]. Journal of Electronics & Information Technology, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946

Citation:

JI Wei, ZHAO Yanan, LIU Ziqing, LI Ting, LIANG Yan, SONG Yunchao, LI Fei. QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS[J]. Journal of Electronics & Information Technology, 2023, 45(10): 3603-3611. doi: 10.11999/JEIT220946

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QoS-oriented Power Allocation Scheme for Multi-user NOMA System Assisted by RIS

doi: 10.11999/JEIT220946

1.
College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2.
College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
3.
Graduate School, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Funds: The National Natural Science Foundation of China (61871238)

Received Date: 2022-07-13
Rev Recd Date: 2023-01-20

Available Online: 2023-02-04

Publish Date: 2023-10-31

Abstract

Abstract

Reconfigurable Intelligent Surface (RIS) can be regarded as a ‘relay’ with special functions in communication network. It can cooperate with Non-Orthogonal Multiple Access (NOMA) system to construct a coordinated information transmission scheme. Considering the different Quality of Service (QoS) requirements of different user devices in the future Internet of Things (IoT) scenarios, a RIS-assisted multi-user NOMA communication system model is proposed. According to the different QoS requirements of two types of users (information users and energy users), a power allocation method based on iterative optimization is designed. This method minimizes the total transmit power of the system by jointly designing the phase-shift matrix of RIS, the beamforming of base station and the order of successive interference cancellation in NOMA system, so as to reduce comprehensively the energy consumption of base station. Simulation results show that compared with the scenario without RIS, RIS-assisted NOMA system can effectively reduce the energy consumption of base station. In the case with RIS, the energy consumption of the proposed power allocation method is significantly lower than that of random phase selection at RIS and zero-forcing beamforming at base station.
- Non-Orthogonal Multiple Access(NOMA),
- Reconfigurable Intelligent Surface(RIS),
- Quality of Service(QoS),
- Power allocation

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References(24)

References

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