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MingZheng Lei

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Proceedings Article | 8 July 2022 Paper

Joint waveforms generation for wireless communication and sensing at MMW-band based on heterodyne detection

A. J. Li, M. Z. Lei, J. Zhang, B. C. Hua, Y. C. Cai, Y. C. Zou, M. Zhu

Proceedings Volume 12284, 1228409 (2022) https://doi.org/10.1117/12.2616531

KEYWORDS: Wireless communications, Radar, Extremely high frequency, Signal generators, Telecommunications, Sensing systems, Transmitters, Heterodyning, Amplitude shift keying, Optical filters

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Wireless communication and sensing show more and more similarities in system design and signal processing flows. A common transmitter sharing is preferred for communication and sensing to reduce equipment cost, hardware size, and power consumption. In this paper, we propose and demonstrate a joint photonic transmitter for wireless communication and sensing at mmW-band based on heterodyne detection. The key device of the photonic transmitter is a dual-drive Mach- Zehnder modulator (DMZM) and a multichannel tunable optical filter (MTOF). The two arms of the DMZM are driven by a specially coded sine wave and a specially coded single chirped linear frequency modulation (LFM) wave, respectively. Besides, both of the two amplitude-coded waves are simultaneously modulated onto the two lasers coupled into the DMZM. By filtering out appropriate sidebands using the MTOF, an amplitude-shift-keying (ASK) signal for wireless communication and a dual-chirp LFM for sensing at mmW-band can be simultaneously generated after heterodyne detection. When the product of the two baseband signals used to code the sine and LFM waves is fixed, the envelope of the mmW LFM wave for radar sensing keeps constant. The simulation results show that a 11.5-Gbit/s ASK signal and a dual-chirp LFM signal with constant envelope are successfully generated at the same time. By properly setting the frequencies of the lasers and the sine wave, the generated ASK signal can be centered at 28GHz for 5G mmW communication, and the generated LFM wave can be distributed around 79GHz for vehicle radar sensing. Thanks to the dual chirps of the mmW LFM wave, range-Doppler decoupling is achieved.

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