8,031 research outputs found
A Real-Time Visible Light Communication System on Chip Design for High Speed Wireless Communication
The increasing demand of wireless communication bandwidth due to advancement of IoT and smartphone technology, requires the new wireless communication technology that can provide high speed wireless communication. The Visible Light Communication (VLC) has been proven can provide multi gigabit wireless communication throughput using unlicensed visible light spectrum. Therefore, VLC is a promising technology to solve bandwidth limitation problem. In order to achieve high speed throughput, VLC signal processing has to be implemented using Application Specific Integrated Circuits (ASICs) technology. In this research, we develop a baseband processor architecture for VLC application. We use System on Chip (SoC) design approach to reduce design time and easy system integration to various applications. In order to increase spectrum efficiency, we utilize OFDM modulation scheme. Several OFDM processing blocks, such as synchronizer, FFT/IFFT, modulator, demodulator, are designed in the system. The real-time system performance is verified in FPGA based system prototyping. The design includes optical wireless front end module, baseband processing and network layer. The developed prototype shows a real-time performance for high speed internet access
An Overview of Broadband communication over Power Lines
Broadband over power lines are Systems for carrying
data on conductors used for electric power
transmission. Power line communication technologies
can be used for different applications ranging from
home automation to internet access.
With the spread of broadband technologies in the last
few years, there are yet significant areas in the world
that do not have access to high speed internet, as
compared with the few internet service providers in
existence, the additive expenditures of laying cables
and building necessary infrastructure to provide DSL
in many areas most especially rural areas is too great.
But if broadband is served through power lines
considering the fact that it exist all over the country,
there will be no need to build new infrastructure.
Therefore, anywhere there is electricity, there could
also be broadband.
Broadband over Power line is designed to offer an
alternative means to provide high speed internet
access, voice over Internet protocol (VOIP) and other
broadband services, using medium and low voltage
lines to reach customers and businesses by combining
the principle of wireless networking, modems and
Radio. Researchers and developers have created ways
to transmit data over power lines into homes at
speeds between 500kilobits and 3 megabits per
second which is equivalent to the cable DSL (Digital
Subscriber Line) and this is achieved by modifying
the present power grids with specialized equipments.
With this knowledge, the broadband power line
developers could partner with power companies and
Internet service providers to bring broadband to
everyone with access to electricity
A survey on OFDM-based elastic core optical networking
Orthogonal frequency-division multiplexing (OFDM) is a modulation technology that has been widely adopted in many new and emerging broadband wireless and wireline communication systems. Due to its capability to transmit a high-speed data stream using multiple spectral-overlapped lower-speed subcarriers, OFDM technology offers superior advantages of high spectrum efficiency, robustness against inter-carrier and inter-symbol interference, adaptability to server channel conditions, etc. In recent years, there have been intensive studies on optical OFDM (O-OFDM) transmission technologies, and it is considered a promising technology for future ultra-high-speed optical transmission. Based on O-OFDM technology, a novel elastic optical network architecture with immense flexibility and scalability in spectrum allocation and data rate accommodation could be built to support diverse services and the rapid growth of Internet traffic in the future. In this paper, we present a comprehensive survey on OFDM-based elastic optical network technologies, including basic principles of OFDM, O-OFDM technologies, the architectures of OFDM-based elastic core optical networks, and related key enabling technologies. The main advantages and issues of OFDM-based elastic core optical networks that are under research are also discussed
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