Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2003-01-17
2008-03-04
Tran, Pablo N. (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S456500, C455S456600, C455S515000
Reexamination Certificate
active
07340259
ABSTRACT:
Replica correlation processing, and associated representative signal-data reduction and reconstruction techniques, are used to detect signals of interest and obtain robust measures of received-signal parameters, such as time differences of signal arrival and directional angles of arrival, that can be used to estimate the location of a cellularized-communications signal source. The new use in the present invention of signal-correlation processing for locating communications transmitters. This enables accurate and efficient extraction of parameters for a particular signal even in a frequency band that contains multiple received transmissions, such as occurs with code-division-multiple-access (CDMA) communications. Correlation processing as disclosed herein further enables extended processing integration times to facilitate the effective detection of desired communications-signal effects and replication measurement of their location-related parameters, even for the communications signals modulated to convey voice conversations or those weakened through propagation effects. Using prior, constructed, signal replicas in the correlation processing enables elimination of the inter-site communications of the signal representations that support the correlation analyses. Reduced-data representations of the modulated signals for voiced conversation, or for the variable components of data communications, are used to significantly reduce the inter-site communications that support the correlation analyses.
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Maloney John E.
Stevenson James O.
KSI Inc.
Tran Pablo N.
Woodcock & Washburn LLP
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