51,599 research outputs found
Internet Predictions
More than a dozen leading experts give their opinions on where the Internet is headed and where it will be in the next decade in terms of technology, policy, and applications. They cover topics ranging from the Internet of Things to climate change to the digital storage of the future. A summary of the articles is available in the Web extras section
The voice activity detection (VAD) recorder and VAD network recorder : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Computer Science at Massey University
The project is to provide a feasibility study for the AudioGraph tool, focusing on two application areas: the VAD (voice activity detector) recorder and the VAD network recorder. The first one achieves a low bit-rate speech recording on the fly, using a GSM compression coder with a simple VAD algorithm; and the second one provides two-way speech over IP, fulfilling echo cancellation with a simplex channel. The latter is required for implementing a synchronous AudioGraph. In the first chapter we introduce the background of this project, specifically, the VoIP technology, the AudioGraph tool, and the VAD algorithms. We also discuss the problems set for this project. The second chapter presents all the relevant techniques in detail, including sound representation, speech-coding schemes, sound file formats, PowerPlant and Macintosh programming issues, and the simple VAD algorithm we have developed. The third chapter discusses the implementation issues, including the systems' objective, architecture, the problems encountered and solutions used. The fourth chapter illustrates the results of the two applications. The user documentations for the applications are given, and after that, we analyse the parameters based on the results. We also present the default settings of the parameters, which could be used in the AudioGraph system. The last chapter provides conclusions and future work
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
UAV-Empowered Disaster-Resilient Edge Architecture for Delay-Sensitive Communication
The fifth-generation (5G) communication systems will enable enhanced mobile
broadband, ultra-reliable low latency, and massive connectivity services. The
broadband and low-latency services are indispensable to public safety (PS)
communication during natural or man-made disasters. Recently, the third
generation partnership project long term evolution (3GPPLTE) has emerged as a
promising candidate to enable broadband PS communications. In this article,
first we present six major PS-LTE enabling services and the current status of
PS-LTE in 3GPP releases. Then, we discuss the spectrum bands allocated for
PS-LTE in major countries by international telecommunication union (ITU).
Finally, we propose a disaster resilient three-layered architecture for PS-LTE
(DR-PSLTE). This architecture consists of a software-defined network (SDN)
layer to provide centralized control, an unmanned air vehicle (UAV) cloudlet
layer to facilitate edge computing or to enable emergency communication link,
and a radio access layer. The proposed architecture is flexible and combines
the benefits of SDNs and edge computing to efficiently meet the delay
requirements of various PS-LTE services. Numerical results verified that under
the proposed DR-PSLTE architecture, delay is reduced by 20% as compared with
the conventional centralized computing architecture.Comment: 9,
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