Browse Prior Art Database

WIDE AREA SYSTEMS USING REMOTE RF SITE EQUIPMENT THAT IS TRANSPARENT TO RF MODULATION AND BANDWIDTH

IP.com Disclosure Number: IPCOM000008664D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-02
Document File: 2 page(s) / 116K

Publishing Venue

Motorola

Related People

James Schroedl: AUTHOR [+2]

Abstract

A wide area system is disclosed that makes the remote site RF equipment transparent to the modu- lation and bandwidth. This creates a base station as being a IF-RF translator and removes all of the remote site modulation and demodulation processing and baseband processing out of the base station to a central location.

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MOTOROLA Technical Developments

.WlDE AREA SYSTEMS USING REMOTE RF SITE EQUIPMENT THAT IS TRANSPARENT TO RF MODULATION AND BANDWIDTH

by James Schroedl and Chris Wilson

ABSTRACT

  A wide area system is disclosed that makes the remote site RF equipment transparent to the modu- lation and bandwidth. This creates a base station as being a IF-RF translator and removes all of the remote site modulation and demodulation processing and baseband processing out of the base station to a central location.

STATEMENT OF PROBLEM

  In the current wide area systems, the audio/data information is transported from site to site over wireline transport equipment. The transmit RF equipment at each remote site converts this audio/data information into a baseband signal which is then used to modulate the remote site transmitter. The receive RF equipment at each remote site demodulates the received RF carrier and converts the recovered baseband signal into the audio/data information format that is transported from site to site.

  This type of architecture forces the RF equip- ment to be designed to specific air interfaces. The more air interfaces that are allowed, the more com- plex the remote site station must be. The system business requires multiple air interfaces. New air interfaces are added but old interfaces must be maintained. This forces the station product business to develop and maintain very complex software and hardware. Systems that have life cycles of 15 years must be supported with RF equipment and compo- nents that have life cycles of 3 to 4 years. For example, a customer may install a system with equipment

that is in the third year of a four year life cycle. The customer expects support and the capability to expand that system for the next ten years. This means that products that have yet to be designed must be able to support this customer's system. Legacy feature support forces significant design requirements on new equipment designs and lengthens the development time of new equipment.

  The type of air interface has a direct impact on the design of the wireline transport interface of the RF equipment. As the number of supported air interfaces increases, the number of supported wire- line transport interfaces also increases.

PROPOSED SOLUTION TO THE PROBLEM

  The solu...