Bit error rate and reliability analysis of cooperative communication in free-space optical systems

High availability cooperative free space optical communication link with various diversity combining methods

“…The pointing accuracy is also an important issue in designing of FSO systems. The PDF of pointing error, h p is given as [16,21] where γ = w zeq /2σ s is the ratio between the equivalent beam radius at the receiver and the pointing error displacement standard deviation (jitter) at the receiver. The parameters w zeq and A 0 can be calculated using the relations [18] w zeq…”

“…In this section, we have analysed the availability and MTBF of cooperative FSO system using a Markov model up to three relays [16,22,23]. In the state diagram of three-relay cooperative FSO system, as shown in Fig.…”

“…Optical modulation formats have been discussed in [15], in which quadrature phase shift keying (QPSK) has been shown as one of the high spectral efficient modulation formats. BER analysis and reliability analysis of cooperative FSO systems have been reported earlier in [16] where QPSK subcarrier modulation with Gamma-Gamma channel model and pointing error model have been included in the study of BER performance analysis, and availability and mean time between failures (MTBF) improvement has been validated by reliability analysis.…”

Relay selection in mixed RF/FSO system using DF relaying

“…However, the traditional RF dual-hop system suffers from some crucial limitations like scarcity of licensed spectrum and limited data rates. To overcome these limitations, the free-space optical (FSO) B Parul Garg parul_saini@yahoo.co.in 1 Division of Electronics and Communication Engineering, Netaji Subhas Institute of Technology, Sector 3 Dwarka, New Delhi 110078, India communication system [4,5] is considered to be used in the relaying with the RF system due to its desirable features [6,7]. The performance analysis of decode-and-forward (DF) relaying in gamma-gamma fading channel is observed in [8], the channel statistics, namely probability density function (PDF) and cumulative distribution function (CDF), are evaluated, and average BER of the considered system is investigated.…”

Asymptotic Performance Analysis of Free-Space Optical Links with Transmit Diversity

“…FSO communications are potential solutions for a variety of applications, such as last-mile communications, fiber backup, and disaster-recovery communications [1]. Compared to traditional radio-frequency (RF) communications, their advantages include high speed, unlicensed spectrum, and excellent security [2].…”