Design and performance analysis of spectral-efficient hybrid CPDM-CO-OFDM FSO communication system under diverse weather conditions

Abstract

A comprehensive design is proposed for the free-space optical (FSO) communication system by hybridizing circular polarization division multiplexing (CPDM) with coherent optical orthogonal frequency division multiplexing (CO-OFDM) and its performance is investigated realistically under diverse turbulent weather conditions of Bangladesh. Here, we consider Gamma–Gamma distribution for the turbulent FSO channel model. Moreover, the proposed scheme presents an excellent performance since the CPDM technique not only maximizes the link capacity of the FSO system but also enhances the spectral efficiency of the system. Besides, multipath fading, which is appeared during the FSO transmission, is significantly mitigated by OFDM modulation. The outcomes from the simulation confirm the advantages of the proposed hybrid scheme and also it can serve as a reference for the FSO application even in turbulent weather conditions. Performance analysis of the proposed model is described in terms of the optical power spectrum, optical signal-to-noise ratio, bit error rate, Q factor, constellation diagrams, and eye diagrams.

An integrated design for improving spectral efficiency of FSO communication system in 6G applications

“…Existing works on FSO communication systems have several drawbacks, including insufficient link capacity, 21 inefficient degree of polarization, 22 high BER and less SNR outcomes, 23 high error rate, less spectral efficiency, 24 less system performance, 25 high model complexity, model maintenance is risky, 26 impair wavelength stability, 27 reducing the communication range, reliability, 28 FSO linkages suffer from beam divergence, 29 and high-cost consumption 30 employed. To address the shortcomings of previous efforts, a new hybrid methodology for enhancing the spectrum efficiency and link capacity of FSO systems in 6G applications is needed.…”

“…A significant scheme was created by Chowdhury et al 22 through the integration of coherent optical orthogonal frequency division multiplexing (CO‐OFDM) and circular polarization division multiplexing (CPDM). Upon contemplating the atmospheric turbulence in the Bangladesh region, performances like BER, eye drawings, optical power spectrum, OSNR, and constellation diagrams were analyzed.…”

Error Analysis of Free Space Communication System Using Machine Learning

“…The irradiance fluctuations' depends on the scintillation strength. According to [6], [11], and [12], the lognormal distribution is commonly used to represent weak scintillation, while the exponential is used to describe strong turbulence [3]. Whereas for moderate scintillation conditions, not much literature is available, while the Beckmann, Gamma-Gamma (GG) and K-distribution are based on heuristic arguments [3].…”

“…for data transmission [4], [5]. Because of many issues, internet service providers and mobile phone companies plan to opt for a different technology, which offers a huge spectrum, secure link and high-speed data transmissions [6], [7].…”

Enhanced Performance of the 4 × 20 Gbit/s-40 GHz OFDM-Based RoFSO Transmission Link Incorporating WDM-MDM of Hermite Gaussian and Laguerre Gaussian Modes

“…The performance comparison of on/off keying, binary, differential, quadrature, and 8-level PSK under the effect of strong atmospheric turbulent conditions is reported in [63]. The application of circular PDM with coherent detection OFDM transmission in FSO for enhanced performance was reported in [64].…”