Abstract

Orthogonal frequency division multiplexing (OFDM) is a promising solution in photonics-aided millimeter-wave (MMW) communication systems, which combine the features of fiber and wireless links. In such a fiber-wireless system, the broadband OFDM signals could be affected by the multipath effect, chromatic dispersion, frequency synchronization error, and other complex impairments. Therefore, both inter-symbol interference (ISI) and inter-carrier interference (ICI) will cause performance degradation. In this experiment, a D-band photonics-aided MMW communication system is demonstrated. To compensate for the linear and nonlinear distortions during the fiber and wireless transmission, we proposed a novel time-frequency domain equalizer based on a two-dimensional convolutional neural network (2D-CNN) with a complex-valued structure. Moreover, a residual branch is adopted. We investigate the bit error rate (BER) performance of the OFDM signals transmission with different modulation formats. With the aid of complex-valued 2D-CNN based equalization, 40 Gbit/s 16QAM and 55 Gbit/s PS-64QAM signals can be successfully transmitted over 200 m wireless distance at the D-band while satisfying the HD-FEC (3.8 × 10⁻³) and SD-FEC (2.0 × 10⁻²) threshold, respectively. Moreover, the complex-valued structure can bring significant sensitivity improvements compared to the real-valued 2D-CNN equalization.

Long-range photonics-aided 17.6 Gbit/s D-band PS-64QAM transmission using gate recurrent unit algorithm with a complex QAM input

Tangyao Xie and Jianguo Yu
Opt. Express 31(24) 40056-40069 (2023)

Photonics-aided integrated sensing and communications in mmW bands based on a DC-offset QPSK-encoded LFMCW

Mingzheng Lei, Bingchang Hua, Yuancheng Cai, Jiao Zhang, Yucong Zou, Weidong Tong, Xiang Liu, Miaomiao Fang, Jianjun Yu, and Min Zhu
Opt. Express 30(24) 43088-43103 (2022)

Sparse I/Q-joint DNN nonlinear equalization based on progressive pruning for a photonics-aided 256-QAM MMW communication system

Junting Shi, Bohan Sang, Wen Zhou, Li Zhao, Junjie Ding, and Jianjun Yu
Opt. Lett. 48(3) 602-605 (2023)

Space–time domain equalization algorithm based on complex-valued neural network in a long-haul photonic-aided MIMO THz system

Sicong Xu, Wen Zhou, Weiping Li, Yumeng Gou, Bohan Sang, Rahim Uddin, and Lingchuan Zeng
Opt. Lett. 49(5) 1253-1256 (2024)

High spectral efficient W-band optical/wireless system employing Single-Sideband Single-Carrier Modulation

Chun-Hung Ho, Chun-Ting Lin, Yu-Hsuan Cheng, Hou-Tzu Huang, Chia-Chien Wei, and Sien Chi
Opt. Express 22(4) 3911-3917 (2014)