Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.

2.  Mobile Telephone System (MTS)
› Introduced in 1946
› Simplex (one-way transmission) and manual
operation
 Improved Mobile Telephone System (IMTS)
› Introduced in 1969 using a 450 MHz band
 Advanced Mobile Phone Service (AMPS)
› Introduced in 1983
› First system to employ a “cellular” concept
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3.  Cellular network:
› Series of overlapping hexagonal cells in a
honeycomb pattern
 Cellular network components
› Base Station:Transmitter, Receiver, Controller,
Antenna
› Cell: Base station’s span of coverage
› Mobile Switching Center: Contains all of the
control and switching elements to connect the
caller to the receiver, even as the receiver
moves from one cell to another
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4.  D-AMPS (Digital-AMPS)
 TDMA (Time Division Multiple Access)
 CDMA (Code Division Multiple
Access)
Digital wireless technologies provide
greater system capacity.
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5.  CDMA
› Third generation system
› Separates users by assigning them digital
codes within a broad range of the radio
frequency
› First technology to use soft-handoff
› Employs spread spectrum technique
› Advantages
 Improved capacity, coverage, voice quality,
and immunity from interference
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7.  Cellular Phone
› High mobility and narrow bandwidth (20 to 30 kHz)
 Cordless Phone
› Low mobility and narrow bandwidth (20 to 30 kHz)
 Wireless LAN
› Low mobility and high bandwidth (typically 10
Mbps)
› Wireless Application Protocol (WAP) is a standard
for wireless data delivery, loading web pages, and
navigation
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9.  Mobile telephone service - a system for
providing telephone services to multiple, mobile
receivers using two-way radio communication over
a limited number of frequencies.
 Mobile wireless evolution:
› First generation
› Second generation
› Third generation

10.  A version of time division multiple access (TDMA)
technology, because it divides frequency bands into
channels and assigns signals time slots within each
channel.
 Makes more efficient use of limited bandwidth than the
IS-136 TDMA standard common in the United States.
 Makes use of silences in a phone call to increase its signal
compression, leaving more open time slots in the
channel.

11.  Address -:
c2mTech
1313 Valwood Suite #320
Carrollton, Texas 75006
 Phone No -:
(P) 972-881-2268 Dallas
(P) 817-442-2268 Ft. Worth
(F) 972-221-9366
 Website -: http://www.c2mtech.com/
 Sales Representative -: sales@c2mtech.com
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