4.6-km D-Band Photonic-Assisted Terahertz Wireless Communication Employing SIMO and MRC Technology

• Published in: IEEE transactions on microwave theory and techniques 2024-11, Vol.72 (11), p.6657-6668
• Main Authors: Zhang, Qiutong, Yu, Jianjun, Zhao, Xianming, Li, Weiping, Wei, Yi, Yang, Xiongwei, Tan, Jingwen, Zhang, Bing, Wang, Kaihui, Zhang, Ying, Wang, Yanyi, Zhou, Wen, Liu, Bo, Zhao, Feng, Yu, Jianguo
• Format: Article
• Language: English
• Subjects: Algorithms; Bandwidth; Bit error rate; Digital signal processing; Diversity gain; Error correction; heterodyne detection; High gain; multiple-input–multiple-output (MIMO)-maximum ratio combining (MRC); Optical filters; photon-assisted terahertz (THz) communication; Photonics; Photons; Signal generation; Signal processing; Signal processing algorithms; Signal quality; Signal to noise ratio; single-input–multiple-output (SIMO); Terahertz communications; Training; Wireless communication; Wireless communication systems; Wireless communications
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2024.3400272

Photon-assisted generation of terahertz (THz) signals can support larger modulation bandwidths in future ultrahigh-speed wireless communication systems. Single-input-multiple-output (SIMO) or multiple-input-multiple-output (MIMO) technology effectively uses the spatial dimension to improve the quality of the received signal, such as signal-to-noise ratio (SNR) and bit error rate (BER) ratio. Therefore, we experimentally demonstrate D-band photon-assisted THz 1\times 2 SIMO 4.6-km wireless communication. We use a photon-assisted THz technology to generate a 124.37-GHz D-band signal, which is received according to the maximum ratio combining (MRC) technology after 1\times 2 SIMO wireless transmission and uses fully blind digital signal processing (DSP) for carrier recovery algorithm without any training sequence. According to the experimental results, the maximum SNR diversity gain between 1\times 1 and 1\times 2 SIMO can be up to 2.8 dB. After the MRC algorithm, the BER can be reduced by one order of magnitude, which is less than 15% of soft decision forward error correction (SD-FEC). This is the first experimental demonstration of high gain and long range in a D-band THz 1\times 2 SIMO system with a line rate of 43.5 Gb/s. These results will provide important assistance to our future efforts in photon-assisted THz wireless communications.