Abstract

Millimeter-wave (MMW) transmission has the advantage of larger available bandwidth compared with traditional wireless communications. Compared with the electrical algorithms, photonics-aided MMW signals generation can support a large modulation bandwidth and is regarded as a potential candidate for future RoF link. In this experiment, we demonstrate a W-band (75 GHz ∼ 110 GHz) photonics-aided MMW communication system. To overcome the high-frequency power loss induced by the limited bandwidth of photoelectric devices, we adopt orthogonal frequency division multiplexing (OFDM) signal with hybrid quadrature amplitude modulation (QAM) formats. Moreover, the probabilistic constellation shaping (PCS) technique is used to further improve the system capacity. In the offline digital signal processing (DSP), a time-domain Volterra series based nonlinear equalizer with I/Q multiple input multiple output (MIMO) structure can compensate for the nonlinearity during the fiber and wireless transmission. Finally, a hybrid time-frequency domain least mean square (LMS) equalizer is proposed to eliminate the crosstalk in the adjacent OFDM symbols and subcarriers. With the aid of advanced modulation and hybrid time-frequency domain equalization, 30 Gbaud OFDM MMW signals with hybrid PS-512QAM and PS-128QAM at 92.5 GHz can be successfully transmitted over 1-m wireless link, whose raw transmission rate is 208.4 Gbit/s. It is worth noting that the hybrid time-frequency domain LMS equalizer can increase the maximal AIR to 178.8 Gbit/s.

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)

OFDM-PS-256QAM signal delivery at 47.45 Gb/s over 4.6-kilometers wireless distance at the W band

Weiping Li, Jianjun Yu, Yanyi Wang, Feng Wang, Bowen Zhu, Li Zhao, Wen Zhou, Jianguo Yu, and Feng Zhao
Opt. Lett. 47(16) 4072-4075 (2022)

Wireless transmission of a 200-m PS-64QAM THz-wave signal using a likelihood-based selection radius-directed equalizer

Junjie Ding, Mingxu Wang, Weiping Li, Bowen Zhu, Feng Wang, Chen Wang, Yanyi Wang, Wen Zhou, Jiao Zhang, Min Zhu, and Jianjun Yu
Opt. Lett. 47(15) 3904-3907 (2022)

Hybrid time-frequency domain equalization for LED nonlinearity mitigation in OFDM-based VLC systems

Jianfeng Li, Zhitong Huang, Xiaoshuang Liu, and Yuefeng Ji
Opt. Express 23(1) 611-619 (2015)

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)