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Intelligent Reflecting Surface-Enhanced OFDM: Channel Estimation and Reflection Optimization
Open accessAbstract
In the intelligent reflecting surface (IRS)-enhanced wireless communication system, channel state information (CSI) is of paramount importance for achieving the passive beamforming gain of IRS, which, however, is a practically challenging task due to its massive number of passive elements without transmitting/receiving capabilities. In this letter, we propose a practical transmission protocol to execute channel estimation and reflection optimization successively for an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system. Under the unit-modulus constraint, a novel reflection pattern at the IRS is designed to aid the channel estimation at the access point (AP) based on the received pilot signals from the user, for which the channel estimation error is derived in closed-form. With the estimated CSI, the reflection coefficients are then optimized by a low-complexity algorithm based on the resolved strongest signal path in the time domain. Simulation results corroborate the effectiveness of the proposed channel estimation and reflection optimization methods.
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Cited by
Toward Smart Wireless Communications via Intelligent Reflecting Surfaces: A Contemporary Survey
Gong, S., Lu, X., Hoang, D. T., Niyato, D., Shu, L., Kim, D. I., & Liang, Y.-C. (2020) · IEEE Communications Surveys & Tutorials · doi:10.1109/comst.2020.3004197 · Cited by 1,035
Prospective Multiple Antenna Technologies for Beyond 5G
Zhang, J., Bjornson, E., Matthaiou, M., Ng, D. W. K., Yang, H., & Love, D. J. (2020) · IEEE Journal on Selected Areas in Communications · doi:10.1109/jsac.2020.3000826 · Cited by 877
Zheng, B., You, C., Mei, W., & Zhang, R. (2022) · IEEE Communications Surveys & Tutorials · doi:10.1109/comst.2022.3155305 · Cited by 579
Self-citationPei, X., Yin, H., Tan, L., Cao, L., Li, Z., Wang, K., Zhang, K., & Bjornson, E. (2021) · IEEE Transactions on Communications · doi:10.1109/tcomm.2021.3116151 · Cited by 553
Latency Minimization for Intelligent Reflecting Surface Aided Mobile Edge Computing
Bai, T., Pan, C., Deng, Y., Elkashlan, M., Nallanathan, A., & Hanzo, L. (2020) · IEEE Journal on Selected Areas in Communications · doi:10.1109/jsac.2020.3007035 · Cited by 528
Metadata
- Authors
- Zheng, B., & Zhang, R.
- Venue
- IEEE Wireless Communications Letters
- Published
- 2020-04
- Volume
- 9
- Issue
- 4
- Pages
- 518-522
- ISSN
- 2162-2337 (ISSN-L)
- 2162-2345
- OpenAlex
- W2971912794
- Cited by
- 876
- References
- 0
- FWCI
- 34.89
- Type
- journal article
- Language
- en
- Open access
- green
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