首页|Performance predictions of VCSEL based cascaded fiber-FSO RoF system for 5G applications
Performance predictions of VCSEL based cascaded fiber-FSO RoF system for 5G applications
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NSTL
Elsevier
This work reports the performance of 5 G New Radio signal transmission over Vertical Cavity Surface Emitting Laser (VCSEL). The optical links incorporate Single Mode Fiber (SMF) upto a distance of 20 km and Free Space Optics (FSO) channels beyond that. The RF signal employed in this Radio over Fiber (RoF) system follows Orthogonal Frequency Division Multiplexing (OFDM). It is based on 5 G New Radio standard, which is a 3.5 GHz RF signal modulated by data at the rate of 2.5 Gbps. The proposed system is numerically examined over a turbulence channel apart from different weather conditions namely rain (17 dB/km), snow (30 dB/km) and light fog (70 dB/ km). The analysis is carried out for three iterations with the aid of linear equalizers namely Recursive Least Square (RLS) and Least Mean Square (LMS). For a Root Mean Square (RMS) Error Vector Magnitude (EVM) requirement of 12.5%, the maximum FSO link length is found to be 243 m, under the circumstance of rain while FSO link length is reduced to 198 m and 133 m under snow (30 dB/km) and light fog (70 dB/km). The atmospheric turbulence is modeled using Gamma-Gamma distribution for strong refractive index structure (C-n(2) =10(-14) m(-2/3)).
OFDMVCSELRoFFree space opticsTurbulence modelingRLS-LMS EqualizerError Vector Magnitude and 5 G bandCOMMUNICATION-SYSTEMMODULATIONLINK
NSTL
Elsevier
