Free Space Optical Communication with OOK and BPSK modulation under different turbulent condition

Abstract

Free Space Optical (FSO) Communications are able to deliver us to an age of unprecedented bandwidth, low signal attenuation, small space requirements and ultimately low cost. In FSO communications the influence of atmospheric effects can be specified by the attenuation and fluctuations of the transmitted optical power, caused by the atmospheric turbulence. This paper investigate the bit error rate (BER) performance of FSO communication systems employing on-off keying (OOK) and subcarrier binary phase-shift keying (BPSK) modulation in turbulence regimes from weak to strong, In addition, we try to compare the BER performance of FSO communication systems employing subcarrier BPSK and OOK as modulation technique.Index Terms -Free-space optics (FSO), gamma-gamma distribution, subcarrier modulation, on-off keying (OOK), binary phase-shift keying (BPSK).

Design and Implementation of the MIMO–COOK Scheme Using an Image Sensor for Long-Range Communication

“…RoI algorithms are being increasingly used to detect objects because these algorithms provide high accuracy in problem-solving. Almost all RoI algorithms use two approaches: object-based and feature-based [26]. The feature-based approach collects all possible pixels based on the similarity of optical features.…”

“…where a i is the level of the i th OOK symbol and a i ∈ {0,1}; we assumed that the probabilities of bit 0 and 1 are P 0 and P 1 , g(t) presents as the rectangular function, and T symbol is the symbol duration. Because of the only additive white Gaussian noise (AWGN) in channel model, the BER can be presented [26] in Equation (4).…”

Performance of FSO Links for BPSK Modulated Signal with Atmospheric Turbulence and Pointing Error

“…The received photocurrent signal is related to the incident optical power by the detector responsivity R. It is assumed that the receiver integrates the photocurrent for each bit period and removes any constant bias due to background illumination. The received signal y suffers from a fluctuation in signal intensity due to atmospheric turbulence and misalignment, as well as additive noise, and can be well modeled as [9] […”

“…Then, the receiver demodulates the electrical signal by using RF devices like selective filters and stable oscillators. At the receiver the received optical intensity P(t) can be written as [9] …”

Performance of Free Space Optical Communication System with BPSK and QPSK Modulation

“…Quadrature Phase Shift Keying). The OOK modulation provides good BER performance but data rate is low [5]. The need of the present time is to get high data rate along with good BER performance.…”