Generalized OSTBC‐based subcarrier intensity‐modulated MIMO optical wireless communication system

Abstract

In this paper, we analyze an optical wireless communication (OWC) system having a source and a destination node, equipped with multiple transmit and receive apertures, respectively. We utilize generalized orthogonal space-time block codes (OSTBCs) of any arbitrary order and subcarrier intensity modulation scheme for data transmission over gamma-gamma (GG) fading optical links using M -ary phase-shift keying (PSK) constellation. A symbol-wise decoding is utilized, and the closed-form expression of the approximate average symbol error rate (SER) of multi-aperture-based OWC system is obtained for the generalized OSTBC and an arbitrary M -PSK constellation. Using the derived SER expression, we analytically evaluate the diversity order and the coding gain of the OWC system with GG atmospheric turbulence. It has been shown by the numerical results that the maximum possible diversity is achieved by using the symbol-wise maximum likelihood decoding in the destination.

DIANA: A Machine Learning Mechanism for Adjusting the TDD Uplink-Downlink Configuration in XG-PON-LTE Systems

“…Recently, the concept of multiple transmit and receive apertures was investigated in [20]. The authors utilized generalized orthogonal space-time block codes of any arbitrary order and subcarrier intensity modulation scheme for data transmission over gamma-gamma fading optical links.…”

“…The OLT, the ONU-eNBs, and the UEs maintain quite large buffers, for example, 1 GB each; hence, no packet drop was considered due to buffer overflow. The distance between the OLT and the ONU-eNBs was uniformly selected within [20,60] Km. This results in propagation delay between [1,3] msec given a propagation speed of 200000 Km/s.…”

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.…”

Spectrally efficient TWR‐aided free‐space optical communication over turbulent channel with generalized pointing error

“…The free-space optical (FSO) communication system follows line-of-sight technology and uses lasers to provide optical connections. It is a simple cost-effective extension of optical fiber communication and has gained interest because of its inherent advantages such as higher bandwidth and capacity [1][2][3]. The link performance and reliability of the FSO system is dependent on the pointing accuracy and atmospheric attenuation.…”

“…Thus, the study in this paper accounts for zero and non-zero boresight component as well as identical and non-identical jitter component in both horizontal and vertical directions. Major contributions of this paper are as follows: (1) we model a spectrally efficient bi-directional, two-time phase, dual hop FSO system over Gamma-Gamma distribution impaired by generalised pointing errors; (2) we obtain the composite PDF of Gamma-Gamma channel distribution impaired by generalised pointing error with Rayleigh and Rician distributed radial displacement component; (3) we provide the novel closed-form expression of composite PDF of Gamma-Gamma distribution impaired with Hoyt-distributed radial displacement component of pointing error. Thus, generalizing the previous works and removing the assumption of identical jitter variance along horizontal and vertical axes; (4) we analyse the statistical characteristics of the aggregated channels and finally provide the outage and error rate performance for the considered system.…”