Hybrid transmitter design for infrared wireless link (original) (raw)
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Wireless Infrared Communications
The use of infrared radiation as a medium for high-speed, short-range wireless digital communication is discussed. Currently available infrared links and local-area networks are described. Advantages and drawbacks of the infrared medium are compared to those of radio and microwave media. Physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented, including path losses and multipath responses. Natural and artificial ambient infrared noise sources are characterized. Strategies for designs of transmitters and receivers that maximize link signal-to-noise ratio (SNR) are described. Several modulation formats are discussed in detail, including on-off keying (OOK), pulse-position modulation (PPM), and subcarrier modulation. The performance of these techniques in the presence of multipath distortion is quantified. Techniques for multiplexing the transmissions of different users are reviewed. Performance of an experimental 50-Mb/s on-off-keyed diffuse infrared link is described.
Development of Optical Wireless Audio System Using Infrared Light Communications
IOSR Journal of Electronics and Communication Engineering, 2013
A simple prototype of an optical wireless audio system by using Infrared (IR) as a source for the transmitter has been proposed. In this project, we designed and implement a wireless optical transmitter and receiver system that established an audio communication at some distances with weak signal via infrared communication. In addition, this project also proposed infrared communication at certain angle which is a new solution or techniques to undertaken the characteristic of light that propagates in a straight line although the signal is very low or weak over long distance. The wavelength that used for this project is 870nm which is infrared wavelength range. Based on the experimental results, the infrared communication system can work successfully within in distance up to 10 meters and sensitivity angle of the photodiode at receiver that view the infrared light coming from the transmitter is up to 140˚. This project is successfully improved the transmission distance and signal coverage area effectively with low cost of hardware, high communication speed and almost no limit to bandwidth.
Electronic tracking for wireless infrared communications
IEEE Transactions on Wireless Communications, 2003
A high-speed wireless system ( 100 Mb/s) for indoor infrared (IR) communications via the line of sight is described and feasibility is shown in an experimental demonstrator. A diffuse link is used for connectivity, and tracked directed links are used for high-speed communications.
Design and Implementation of Infrared (IR) Communication System
Wireless Infrared (IR) communications system is meant to use free-space propagation of light waves as a transmission medium in near infrared band. In this paper, voice communication system is simulated and implemented by protues software using IR as a source that is established an audio communication (link to transmit and receive voices and music via infrared light). The outcome of this proposed work is to design and implementation an optical wireless system to transmit voice over a certain distance in laboratory. This system has many advantages such as is a common, inexpensive, and the transmitter or receiver can be showed to another location with least distraction.
Assessing the feasibility of new diffused configuration for broadband wireless infrared links
2003
Traditionally, diffused infrared configuration has been studied with the assumption that the illuminated region is placed at room ceiling. This is done to ensure minimum path loss to a maximum number of receiver locations. In many practical situations, this arrangement might be difficult to implement, either due to the ceiling structure or the difficulty in illuminating the entire ceiling uniformly without introducing an intrusive transmitter. In this paper, we propose a new configuration, in which the upper regions of the walls are illuminated. Path loss and delay spread are used as performance measures to assess the feasibility of the proposed configuration.
Optical Wireless Communications, 1999
The performance of optical wireless transmission systems is mainly impaired by the shot noise induced by ambient light, interference produced by artificial light sources, transmitted optical power limitations due to high path losses and channel bandwidth limitations due to inter-symbol interference (ISI) produced by the multipath dispersion of the optical signal. The contribution of these factors to the performance evaluation of infrared links have only been addressed independently and the combined effect of these channel impairments was not presented yet. The work presented in this paper extends the previous analysis by taking into account the combined effects of both optical noise (shot noise and interference) and channel impulse response. A simulation package was used to determine the indoor optical channel impulse response due to the propagation losses and multipath dispersion under various room geometries and emitter/receiver parameters. The contribution of the interference produced by incandescent and fluorescent lamps was done through the utilisation of analytical models. The penalty introduced by these channel characteristics was quantified considering the modulation schemes usually considered for optical wireless communication systems: 2-, 4-and 16-PPM (pulse position modulation) at bit rates from 1 to 10 Mbps.
Infrared wireless communication using spread spectrum techniques
IEE Proceedings - Optoelectronics, 2000
The performance of nondirected line-of-sight indoor wireless infrared communication systems is mainly affected by ambient light-induced shot noise, multipath dispersion and interference produced by artificial light sources. Application of spread spectrum techniques to combat multipath dispersion and artificial light interference is presented, with bit error rate analysis considering these two effects. Experiments were carried out to verify the bit error rate analysis and to demonstrate the practical performance of a spread spectrum system. For the lineof-sight link investigated both experimental and analytical results show that a spread spectrum system operating at 2 Mbit/s and with spreading factor 3 1 suffers a power penalty of less than 0.5 optical dB due to multipath dispersion, and less than one optical dB penalty is incurred under the influence of 10 dB artificial light interference.
Optical Wireless Communication System for Data Transfer
The last few decades have seen rapid advances in information and communication technology. We commonly use broadband technology with high-speed Internet connectivity at our homes, offices, and in our mobile devices. The bandwidth and high-capacity requirements due to the increased use of Internet and broadband services have exceeded our expectations in twenty-first century. Optical Wireless communication (OWC) uses optical carrier in the near-infrared (IR) and visible light bands (VLC) and is considered a viable solution for realizing very high-speed and large-capacity communication links. It is a line-of-sight communication using a laser/LED to transmit the information signal between two transceivers over an unguided channel which may be either the atmosphere or free space. The technology that is used to achieve Optical Wireless Communication discussed in this paper is Li-Fi technology. Keywords: Li-Fi, visible light communication (VLC), light emitting diode (LED), photo detector, optical wireless communication. (OWC) ________________________________________________________________________________________________________