Browse Prior Art Database

SIGNAL SOURCE DELAY MITIGATION

IP.com Disclosure Number: IPCOM000008606D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-26
Document File: 2 page(s) / 76K

Publishing Venue

Motorola

Related People

Phil Hargrave: AUTHOR [+3]

Abstract

Interdevice interfacing represents a significant challenge in the development and deployment of land mobile radio networks. Such networks are, which are typically purchased by public safety orga- nizations, are expected to provide 100% reliable service. No gaps in the audio are allowed. Additionally, the network components can often be distributed over wide geographic areas and are expected to continue reliable operation in subopti- ma1 conditions. These conditions can often cause delay in the transmission of a signal between the various components of a network. The variety of digital and analog voice and data modulation types, as well as the differing needs of the various radio network components makes the problem of signal source delay yet more challenging.

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MOTOROLA Technical Developments

SIGNAL SOURCE DELAY MITIGATION

by Phil Hargrave, Matt Laswell and Steven VanSickle

PROBLEM

  Interdevice interfacing represents a significant challenge in the development and deployment of land mobile radio networks. Such networks are, which are typically purchased by public safety orga- nizations, are expected to provide 100% reliable service. No gaps in the audio are allowed. Additionally, the network components can often be distributed over wide geographic areas and are expected to continue reliable operation in subopti- ma1 conditions. These conditions can often cause delay in the transmission of a signal between the various components of a network. The variety of digital and analog voice and data modulation types, as well as the differing needs of the various radio network components makes the problem of signal source delay yet more challenging.

  One specific case in which signal source delay is problematic is in communication between receivers, which receive RF signals from the system's users, and comparators, which perform best signal selection on the signals captured by the various receivers. The comparator must not propa- gate gaps in its input to its output. If the comparator does not provide stable input to the transmitters

which receive its output, they will eventually cease transmitting, dekeying on the RF channel. Once the comparator resumes sending, the stations must then take time to key up on the RF channel again....