Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 20, Issue 5, Pages 2792-2804Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2020.3044302
Keywords
Device-to-device communication; Interference; Wireless communication; Optimization; Array signal processing; Resource management; Uplink; Device-to-device communications; discrete phase shifts; power allocation; reconfigurable intelligent surface
Funding
- National Key Research and Development Program of China [2020YFB1806903, 2016YFE0200900]
- Fundamental Research Funds for the Central Universities [2020YJS218]
- National Natural Science Foundation of China [61725101, 6196113039, 61801016, U1834210]
- Royal Society Newton Advanced Fellowship [NA191006]
- State Key Laboratory of Rail Traffic Control and Safety [RCS2020ZT010, RCS2019ZZ007]
- State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University [RCS2019ZZ005]
- Fundamental Research Funds for the Central Universities, China [I20JB0200030, 2020JBM089]
- open research fund of National Mobile Communications Research Laboratory, Southeast University [2021D09]
- U.S. National Science Foundation [CCF-1908308]
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This paper studies an RIS-assisted single cell uplink communication scenario to mitigate interference caused by D2D links and maximize system rate. The problem is decomposed into power allocation and phase shift optimization sub-problems using alternating maximization, with gradient descent and local search algorithms utilized. Simulation results demonstrate that deploying RIS with optimized phase shifts effectively eliminates interference in D2D networks.
With the evolution of 5G, 6G and beyond, device-to-device (D2D) communications have been developed as an energy-, and spectrum-efficient solution. However, D2D links are allowed to share the same spectrum resources with cellular links, which will bring significant interference to those cellular links. Fortunately, an emerging technique called reconfigurable intelligent surface (RIS), can mitigate aggravated interference caused by D2D links by adjusting phase shifts of the surface to create favorable beam steering. In this paper, we study an RIS-assisted single cell uplink communication scenario, where a cellular link and multiple D2D links share the same spectrum and an RIS is adopted to mitigate the mutual interference. The problem of maximizing total system rate is formulated by jointly optimizing transmission powers of all links and discrete phase shifts of the surface. To obtain practical solutions, we capitalize on alternating maximization and the problem is decomposed into two sub-problems. For the power allocation, the problem is a difference of concave functions (DC) problem, which is solved with the gradient descent method. For the phase shift optimization, a local search algorithm is utilized. Simulation results show that deploying the RIS with optimized phase shifts can effectively eliminate the interference in D2D networks.
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