Team 5 Mobile Digimedics, LLC Wireless Blood Pressure ...

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21 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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Short Distance

Wireless Communication


Team 5

Thomas French

Jordan Harris

Mike Symanow

Luseane Tangataevaha

Wireless Communication


Platforms:


Wi
-
Fi


Bluetooth


Zigbee


WWan


Concepts:


Advantages / Disadvantages


Applications


Wi
-
Fi


IEEE 802.11g


Data Rate:
Maximum 54 Mbps


Product Range:
up to 100 meters


Operating Frequency:
2.4 GHz


Security:
Password Encryption







Wi
-
Fi


How It works:


Data Transmission/Acquisition


Wired Ethernet connection


OFDM


Closely spaced orthogonal sub
-
carriers.


Reduction of attenuation with high frequencies.


Facilitates single
-
frequency networking.


Broadcasting


Decoding of the Signal


Wireless Card



Wi
-
Fi Applications


Modem for internet


Cable


DSL



Device to device
communication.

Wi
-
Fi


Advantages:


Comparatively higher data transfer rates than other
similar technologies.


Low infrastructure


Wide availability


Disadvantages:


Cost


Limited range: Restricted to “Hot Spots”





Bluetooth





Open Wireless Protocol, WPAN
standard


Operates ISM band at 2.4
-
2.4835 GHz


Uses radio technology called
frequency
-

hopping spread


spectrum



Modulation
-

Gaussian Frequency
-
Shift Key Modulation

Bluetooth


Frequency
-

Hopping Spread Spectrum


Chunks of
data transmitted


Spread
-
spectrum signals are highly
resistant to narrowband


interference


Difficult to intercept


Transmissions share a frequency


band with minimal interference


Bluetooth


Data rate up to 1Mb/s


3 Mb/s


Use in mobile phones, laptops,
telephones, printers, GPS, video
game consoles


Bluetooth USB dongle


must
use if computer is not Bluetooth
enabled

http://en.wikipedia.org/wiki/Bluetooth

Advantages/Disadvantages


Advantages:


Wireless, Inexpensive, Automatic


Low energy and power consumption


Disadvantages:


Security


Viruses over the years


Bluejacking


Health Concerns (same as mobile phones)




ZigBee


High
-
level communication protocol


Aim low


The Name


Zig
-
zagging of bees from flower to flower


Analogous to mesh networking


ZigBee Applications

Source: http://www.zigbee.org/imwp/idms/popups/pop_download.asp?ContentID=7092

ZigBee

Advantages


Extremely low power


Simple sensor: 1 AA = >5 years


Sleep modes allow decades of use


Low response time


Low cost


ZigBee

Disadvantages


Low data rate


Bluetooth = 3Mbps; ZigBee = 250kbps


Low range


<35m on average


Geared towards very specific
applications


“Aim low”

Wireless Wide Area

Network (WWAN)


Wireless communication technology for
data exchange over long distances.


~7 miles maximum range.


Uses cell phone networks for data exchange.



Applications


Mobile Internet Access


Laptop Computers


Hand Held Devices (Cell Phones)


Net Books




Operation


Cell Phone network for data transfer


WiMAX communication.



IEEE 802.16 communication standard


Allows connection continuity between service
areas

Performance


Current networks are typically 3G Cell


Typically 2.5 GHz, 70 Mb/s


Actual data transfer rates depend on range and
strength of signal and data formatting.


Limitations


Network availability


Signal strength

Future


4G Cell Networks


Higher network capacity


100Mbit/s to 1Gbit/s data transfer rates


Smoother handoff


Operational by ~2010


Satelite

Communication


Global internet access


High transfer rates

Summary

Design

Power

Usage

Range

Data

Transfer

Ease of

Integration

Cost

Bluetooth

100mW


100m


3Mbps


Easy


~$150


Wi
-
Fi

50mW


32m
-
95m


100Mbps


Medium


~$360


ZigBee

45mW


<35m


250Kbps


Difficult


~$12


WWan

N/A


7km


54Kbps


Difficult


~$850

QUESTIONS?