Pilot Optimization and Channel Estimation for Two-Way Relaying Network Aided by IRS With Finite Discrete Phase Shifters

Sun, Zhongwen; Wang, Xuehui; Feng, Siling; Guan, Xinrong; Shu, Feng; Wang, Jiangzhou

doi:10.1109/tvt.2022.3230423

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…Solution to optimization problem has been presented in the literature for different scenarios, for example, MISO systems [11] where only the cascade channel (BS-IRS-Users) information is necessary and MIMO system [12] where the individual channel information (BS-IRS and IRS-User) are required. In this context, many works have been focused on the joint precoder and phase shifts design, while few works are dedicated to investigating the joint pilot and phase shift design [13], [14]. In this sense, the authors in [15] highlight the difficulty of a joint model/design for the IRS phase shift matrix and pilot symbols, while pointing out the challenge involved with a decoupled estimation of the individual communication channels.…”

Section: Introductionmentioning

confidence: 99%

Joint Pilot and Phase Shift Design for IRS-assisted MIMO Communications

Araújo,

Almeida

2023

Anais Do XLI Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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Intelligent reflecting surface (IRS) is envisioned for beyond 5G systems due to its capacity to boost the spectral and energy efficiencies of wireless communications. The decoupled estimation of the involved communication channels is a non-trivial task in IRS-assisted wireless communications, especially for passive IRS structures. In this context, the joint design of the pilot sequences and the IRS phase shifts for channel estimation (CE) is challenging. In this paper, we provide an analytical solution to jointly design an optimal pilot and IRS phase shift matrices, leading to an improved CE performance. The solution consists of a factorization procedure that exploits the intrinsic Khatri-Rao structure of the combined pilot and phase shift matrices. This design is also used to obtain decoupled estimates of the individual channel matrices. Our results also show the noise rejection gain obtained from the proposed CE scheme compared to the conventional LS method. The proposed joint design offers a more efficient computation in terms of FLOPs and results in a faster channel estimation process than that of the individual design approach.

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