| Wireless
Networked Digital Devices |
Definition The
proliferation of mobile computing devices including laptops, personal digital
assistants (PDAs),and wearable computers has created a demand for wireless personal
area networks (PANs).PANs allow proximal devices to share
information and
resources.The mobile nature of these devices places unique requirements on PANs,such
as low power consumption, frequent make-and-break connections, resource discovery
and utilization, and international regulations. This
paper examines wireless technologies appropriate for PANs and reviews promising
research in resource discovery and service utilization. We recognize the need
for PDAs to be as manageable as mobile phones and also the restrictive screen
area and input area in mobile phone. Thus the need for a new breed of computing
devices to fit the bill for a PAN. The above devices become especially relevant
for mobile users such as surgeons and jet plane mechanics who need both hands
free and thus would need to have "wearable" computers. This
paper first examines the technology used for wireless communication.Putting a
radio in a digital device provides physical connectivity;however,to make the device
useful in a larger context a networking infrastructure is required. The
infrastructure
allows devices o share data,applications,and resources such as printers, mass
storage, and computation power. Defining a radio standard is a tractable problem
as demonstrated by the solutions presented in this paper.
Designing a network
infrastructure is much more complex. The
second half of the paper describes several research projects that try to address
components of the networking infrastructure. Finally there are the questions that
go beyond the scope of this paper, yet will have he greatest effect on the direction,capabilities,and
future of this paradigm. Will these networking strategies be incompatible, like
he various cellular phone systems in the United States, or will there be a standard
upon which manufacturers and developers agree, like the GSM (global system for
mobile communication)cellular phones in Europe? Communication
demands compatibility, which is challenging in a heterogeneous
marketplace. Yet by establishing and implementing compatible systems, manufacturers
can offer more powerful and useful devices to their customers. Since these are,
after all, digital devices living in a programmed digital
world, compatibility
and interoperation are possible. Technologies
explored:
1. Electric field- use human body as a current conduit.
2.Magnetic
field-use base station technology for picocells of space.
3.Infra Red- Basic
issues including opaque body obstruction.
4.Wireless Radio Frequency- The
best technology option however has to deal with the finite resource of the electro
magnetic spectrum.
Also must meet
international standards by a compatible protocol.
a. UHF Radio.
b. Super
regenerative receiver
c. SAW/ASH Receiver.
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