High efficiency wireless optical links in high transmission speed wireless optical communication networks

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.

Section: Introductionmentioning

confidence: 99%

“…However, the atmospheric turbulence-induced fading is one of the major impairments affecting these OWC systems [8]. In the aforementioned studies [1][2][3][4][5][6][7][8], a very simple setup with single antenna node is considered, thus limiting the system performance due to the absence of diversity benefits.…”

Section: Introductionmentioning

confidence: 99%

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

Sharma

Bansal

Garg

2016

“…LEDs also have the advantage that their light output can be modulated with high-frequency signals. Besides indoor wireless communications, VLC technology can be applied to other applications such as the VLC between a traffic light and a vehicle [16] or outdoor wireless optical communications also called free-space optical communication [17][18][19]. VLC has gained much attention as a strong candidate for future indoor wireless communication because of several advantages including its unregulated huge bandwidth (nearly 400 THz) and not causing electromagnetic interference [15].…”

Section: Introductionmentioning

confidence: 99%

“…VLC has gained much attention as a strong candidate for future indoor wireless communication because of several advantages including its unregulated huge bandwidth (nearly 400 THz) and not causing electromagnetic interference [15]. Besides indoor wireless communications, VLC technology can be applied to other applications such as the VLC between a traffic light and a vehicle [16] or outdoor wireless optical communications also called free-space optical communication [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Half‐duplex visible light communication using an LED as both a transmitter and a receiver

Kim

Lee

2015

In typical visible light communication (VLC) systems, light-emitting diodes (LEDs) are used as optical transmitters and photodiodes are used as optical receivers. Currently, many communication devices such as smart phones have a built-in LED lamp whereas they usually do not have a built-in photodiode. If we find a way to receive VLC signals without the need to add an additional photodiode on the communication devices, it will contribute to the spread of VLC. Therefore, we propose and demonstrate a VLC scheme without the need for a photodiode. As the first step, we investigate the characteristics of an LED as a VLC receiver and find out that an LED can also be used as a VLC receiver in certain conditions. Then, we demonstrate a half-duplex VLC system using an LED as both an optical transmitter and an optical receiver, without the need for a photodiode. This technique could be used in various applications such as the VLC between smart phones with a built-in LED lamp and the VLC between LED traffic lights.

“…Free space optical (FSO) communication provides an efficient solution to the ever increasing demand for high data rates. FSO is simple to implement and provides a license-free bandwidth having high transmission capacity with an order of multiple gigabit per second [1][2][3]. However, the performance of FSO systems is immensely dependent on uncontrollable factors, such as scattering, absorption, and scintillation processes occurring in the atmospheric channel [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Bi‐directional relay‐assisted FSO communication systems over strong turbulence channels with pointing errors

Puri

Garg

Aggarwal

2015

SUMMARYThis paper presents the capacity and average bit error rate (BER)-based performance analysis of a two-way relay-assisted free-space optical communication system, over an atmospheric turbulent channel modeled by the Gamma-Gamma distribution and also affected by path loss and misalignment errors. A half-duplex, decode-and-forward, two-way, optical relay is considered, which establishes communication between two terminals, when direct communication is not possible because of non line-of-sight propagation or large distance. For the presented system and channel models and considering heterodyne detection at the receiver, we formulate the statistics of the instantaneous signal-to-noise ratio, followed by calculation of exact analytical expressions of capacity and BER. The mathematical expressions are formulated in terms of easily computable Meijer's G-function. This mathematical analysis is accompanied with several numerical examples to illustrate the effect of the key system parameters.