User's Manual

AnyDATA.NET Inc. AnyTime AnyPlace Any Wireless Data Solution
TM
2. Overview
2.1 Application Descriptions
The CDMA Wireless Data Module is a complex consumer communications instrument that relies
heavily on both digital signal and embedded processor technologies. The Wireless Data Modules
manufactured by AnyDATA.NET support Code-Division Multiple Access (CDMA). This operates in both
the cellular and PCS spectrum band.
In a continuing effort to simplify the design and to reduce the size and production cost of the
Wireless Data Module, AnyDATA.NET has successfully developed the DTEV-series. The DTEV-Dual is
AnyDATA.NET’s latest compact Wireless Data Module operating in the Cellular and PCS spectrum band.
DTEV-Dual contains not only a complete digital modulation and demodulation system for CDMA
standards as specified in IS-95 A/B, IS-2000 , IS-856 but also GPSOne position location solution which
offers wireless callers their location wherever and whenever they need it.
GPSOne is QUALCOMM CDMA Technologies’ position location solution. It offers the availability
of position location determination in hostile environments (such as indoors) where conventional
GPS receivers do not work well.
GPSOne uses a hybrid approach that utilizes signals from the GPS satellite constellation and from
CDMA cell sites to determine location. Using the hybrid approach, GPSOne enhances location
services availability, accelerates the location determination process, and provides improved accuracy.
The hybrid mode approach for position location uses signals from CDMA cell stations and GPS
satellites to compute the user’s location. This approach basically takes advantage of an accurate
knowledge of GPS system timing on a CDMA mobile station. The knowledge of system timing
allows the GPSOne solution to use both the CDMA signal measurements and GPS signal
measurements collectively to compute the user’s location. It also allows for a central entity, named
Position Determination Entity (PDE), to send estimated signal phases to the mobile. This knowledge
reduces the time to search the satellite pseudo ranges on the mobile, thus improving the time taken to
determine the user’s position.
The subsystem in DTEV-Dual includes a CDMA processor MSM6500™ chipset’s multimedia
support for MP3 player and integrated stereo HiFi audio DAC, 64-polyphony MIDI sound synthesizer and
PC-quality wavetable , MMC Mobile™ , USB-On-The-Go transceiver, Stereo Wireband Codec for digital
music clips.
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AD-2001-06-28 Ver 1.1
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