Abstract
Free space optics (FSO) has been considered as the alternative to wireless radio communication system because of the inherent advantages such as huge data rate, license-free operation, easy and quick deployability. Nevertheless, the performance of the FSO system is greatly influenced by atmospheric temperature, pressure, humidity etc. To overcome these challenges various techniques have been proposed in the literature, not only in the physical layer but also in the transport layer. Generally, the average bit error rate (BER) and quality factor (Q-factor) are prime parameters to measure the performance of the FSO systems. To improve the average BER and Q-factor, different types of modulation schemes have been analyzed for different weather conditions. In this paper, for the first time, to improve the performance of the system, differential phase shift keying (DPSK) modulation technique with Manchester coding is used. Manchester encoding synchronizes the signal itself; hence, it minimizes the error rate and optimizes the reliability of the proposed system. In addition, a 16-channel wavelength division multiplexing (WDM) FSO system is considered for improving the spectral efficiency of the system. For analyzing, the low to high turbulence level of atmosphere Gamma-Gamma type channel model is preferred.
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