Indication of coverage area limits within digital communication systems
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United States of America Patent
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-
Nov 23, 1999
Issued Date -
N/A
app pub date -
Aug 19, 1994
filing date -
Feb 11, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital radio frequency ('RF') communication unit (103, 104) measures digital signal quality based on received signal strength information ('RSSI') and/or bit error rate ('BER') information. The RSSI and/or BER information are compared with a predetermined threshold. If the predetermined threshold is exceeded, then simulated RF channel noise is injected into the speaker path during unvoiced periods in the message at a level which indicates the RF signal quality to warn the user of the digital communication unit that the outer limits of a given coverage area are being approached.
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