Resonant beam communications (RBCom) is capable of providing wide bandwidth when using light as the carrier. Besides, the RBCom system possesses the characteristics of mobility, high signal-to-noise ratio (SNR), and multiplexing. Nevertheless, the channel of the RBCom system is distinct from other light communication technologies due to the echo interference issue. In this article, we reveal the mechanism of the echo interference and propose the method to eliminate the interference. Moreover, we present an exemplary design based on frequency shifting and optical filtering, along with its mathematic model and performance analysis. The numerical evaluation shows that the channel capacity is greater than 15 b/s/Hz.
Bibliographical noteFunding Information:
Manuscript received May 9, 2020; revised August 5, 2020; accepted August 28, 2020. Date of publication September 1, 2020; date of current version February 4, 2021. The work of Mingliang Xiong and Qingwen Liu was supported by the National Natural Science Foundation of China under Grant 61771344. The work of Gang Wang was supported by the National Natural Science Foundation of China under Grant 61720106011, Grant 61925303, and Grant U1613225. The work of Georgios B. Giannakis was supported by the National Science Foundation under Grant 1711471 and Grant 1901134. This article was presented in part at the 11th International Conference on Wireless Communications and Signal Processing (WCSP), Xi’an, China, October 23–25, 2019. (Corresponding author: Qingwen Liu.) Mingliang Xiong and Qingwen Liu are with the College of Electronics and Information Engineering, Tongji University, Shanghai 201804, China (e-mail: firstname.lastname@example.org; email@example.com).
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- Frequency-shift filtering
- Internet of Things
- laser communications
- optical mobile communications (OMC)
- resonant beam system (RBS)