Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 71, Issue 1, Pages 1004-1009Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2021.3122889
Keywords
Direction-of-arrival estimation; Cramer-Rao bounds; Quantization (signal); Surface waves; Simulation; Employment; Estimation; Integrated sensing and communications; constant-modulus waveform design; reconfigurable intelligent surface; exact penalty method; Cramer-Rao bound
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Funding
- National Natural Science Foundation of China [U20B2039]
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This paper investigates the use of RIS in mitigating multi-user interference (MUI) in ISAC systems. It proposes a joint waveform and phase shift design method and solves the problem using an alternating optimization algorithm. Simulation results demonstrate that the proposed algorithm can significantly improve the communication rate.
Integrated sensing and communication (ISAC) technique has been viewed as a promising component in future network. A major challenge for ISAC systems is that the constraint introduced by sensing functionality will constrain the degrees of freedom in waveform design and results in large multi-user interference (MUI), thus degrading the communication performance. In this paper, we study the employment of RIS in mitigating MUI in ISAC systems. For practical consideration, we investigate joint constant-modulus waveform and discrete RIS phase shift design, with the aim of minimizing MUI under the Cramer-Rao bound (CRB) constraint for direction of arrival (DOA) estimation. An alternating optimization algorithm is proposed to solve the formulated problem, and two schemes are proposed to deal with the discrete RIS phase shifts. Simulation results show that the proposed algorithm can dramatically improve the sum rate, and the performance under moderate phase shift quantization level is close to that under continuous phase shifts.
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