User's Manual

AnyDATA.NET Inc. AnyTime AnyPlace Any Wireless Data Solution

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 DTG series. The DTG2000-Dual

V2.0 is AnyDATA.NET’s latest compact Wireless Data Module operating in the Cellular and PCS

spectrum band. The DTG2000-Dual V2.0 contains not only a complete digital modulation and

demodulation system for CDMA standards as specified in IS-95 A/B and IS-2000, 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 the DTG2000-Dual V2.0 includes a CDMA processor (MSM6050), an integrated

CODEC with an ear piece and microphone amplifiers, and an RS-232 serial interface supporting forward

link data communications at a rate of 153kbps.

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The DTG2000-Dual V2.0 provides an external interface that includes the standard RS-232, Digital

Audio, External reset control, parallel LCD Display, Keypad, Ringer extension ports and R-UIM for