A Hybrid Millimeter-Wave and Free-Space-Optics Communication Architecture with Adaptive Diversity Combining and HARQ Techniques

Yinjun Liu; Xiaochuan Tan; Junlian Jia; Boyu Dong; Changle Huang; Penghao Luo; Jianyang Shi; Nan Chi; Junwen Zhang

doi:10.3390/photonics10121320

Photonics (Nov 2023)

A Hybrid Millimeter-Wave and Free-Space-Optics Communication Architecture with Adaptive Diversity Combining and HARQ Techniques

Yinjun Liu,
Xiaochuan Tan,
Junlian Jia,
Boyu Dong,
Changle Huang,
Penghao Luo,
Jianyang Shi,
Nan Chi,
Junwen Zhang

Affiliations

Yinjun Liu: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Xiaochuan Tan: The 54th Research Institute of CETC, Shijiazhuang 050081, China
Junlian Jia: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Boyu Dong: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Changle Huang: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Penghao Luo: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Jianyang Shi: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Nan Chi: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China
Junwen Zhang: Key Lab of EMW Information (MoE), Fudan University, Shanghai 200433, China

DOI: https://doi.org/10.3390/photonics10121320
Journal volume & issue: Vol. 10, no. 12
p. 1320

Abstract

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We propose and demonstrate a hybrid communication architecture that combines millimeter-wave (MMW) in the radio frequency (RF) domain and free-space-optics (FSO) technologies using adaptive combining and hybrid automatic repeat request (HARQ) techniques. At the receiving end, we employed joint signal processing with an adaptive diversity combining technique (ADCT) based on a maximum ratio combining (MRC) algorithm. We derived closed-form expressions for the outage probability and throughput of the hybrid RF and FSO (RF/FSO) system, considering various characteristics of atmospheric turbulence in the FSO link. Experimental testing with 10-Gbaud quadrature phase shift keying (QPSK) data was conducted under different simulated atmospheric turbulence intensities, FSO and MMW speed-ratios, and forward error correction (FEC) overheads. Additionally, we validated improvements in terms of bit error ratio (BER), outage probability, and throughput performance.

Published in Photonics

ISSN: 2304-6732 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: http://www.mdpi.com/journal/photonics

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