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US5095493A Expired / Lapsed US ⏱️ 0.0 years remaining

Wireless alarm system

Assignee: NORTHPEAK WIRELESS LLC
•
Filing: 1990-08-20
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Granted: 1992-03-10
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Expires: 2010-08-20
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Abstract

Abstract A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled to a microprocessor with chip code generation means, preamble register, address register and data register. The spread spectrum receiver acquires synchronization of the spread spectrum signal using a microprocessor coupled to the quieting, signal strength or baseband output of the receiver, with a two step algorithm. The steps comprise achieving a coarse lock and a fine lock to the spread spectrum signal.

Inventors

  • 👤 James D. Arthur
  • 👤 H. Britton Sanderford, Jr.
  • 👤 Robert E. Rouquette

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 14:39
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; G; G08; G08B; G08B25/00; G08B25/01; G08B25/10; H04B1/70757; H04B1/7077; H04B1/70756; H04B2201/00; H04B2201/69; H04B2201/707; H04B2201/70715

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 130 words
An apparatus for achieving spread spectrum chip code synchronization using a two step algorithm in a processor coupled to a receiver having an output, comprising: means coupled to the output of said receiver for correlating a first signal from the output of said receiver within one chip of said spread spectrum chip code by comparing the first signal to an adaptive average to determine whether the first signal achieves coarse correlation; and means coupled to the output of said receiver for correlating a second signal, in response to the first signal achieving coarse correlation, from the output of said receiver within a portion of one chip of said spread spectrum chip code by comparing the second signal to the adaptive average to determine whether the second signal achieves coarse correlation.
Claim 2
Independent Claim 130 words
An apparatus for achieving spread spectrum chip code synchronization using a two step algorithm in a processor coupled to a receiver having an output, comprising: means coupled to the output of said receiver for correlating a first signal from the output of said receiver within one chip of said spread spectrum chip code by comparing the first signal to an adaptive average to determine whether the first signal achieves coarse correlation; and means coupled to the output of said receiver for correlating a second signal, in response to the first signal achieving coarse correlation, from the output of said receiver within a portion of one chip of said spread spectrum chip code by comparing the second signal to the adaptive average to determine whether the second signal achieves coarse correlation.
Claim 3
Dependent Claim 43 words
The apparatus as set forth in claim 1 further including means coupled to said correlating means for computing the adaptive average, in response to the first signal not exceeding the preset margin, for adding the first signal to the previously computed adaptive average.
Claim 4
Dependent Claim 146 words
A spread spectrum chip code synchronization method using a two step algorithm in a processor coupled to a receiver having an output, comprising the steps, performed by said processor, of: correlating a first signal from the output of said receiver within one chip of said spread spectrum chip code by comparing the first signal to an adaptive average to determine whether the first signal exceeds the preset margin; computing the adaptive average, in response to the first signal not exceeding the preset margin, by adding the first signal to the previously computed adaptive average; and correlating a second signal, in response to the first signal exceeding the preset margin, from the output of said receiver within a portion of one chip of said spread spectrum chip code by comparing the second signal to the adaptive average to determine whether the second signal exceeds the preset margin.
Claim 5
Dependent Claim 146 words
A spread spectrum chip code synchronization method using a two step algorithm in a processor coupled to a receiver having an output, comprising the steps, performed by said processor, of: correlating a first signal from the output of said receiver within one chip of said spread spectrum chip code by comparing the first signal to an adaptive average to determine whether the first signal exceeds the preset margin; computing the adaptive average, in response to the first signal not exceeding the preset margin, by adding the first signal to the previously computed adaptive average; and correlating a second signal, in response to the first signal exceeding the preset margin, from the output of said receiver within a portion of one chip of said spread spectrum chip code by comparing the second signal to the adaptive average to determine whether the second signal exceeds the preset margin.
Claim 6
Independent Claim 243 words
A method of using a processor for synchronizing the timing acquisition of a spread spectrum signal received by a receiver, the spread spectrum signal having a plurality of information bits with each information bit including a plurality of chips from a spread spectrum chip code, comprising the steps, performed by said processor, of: sampling and digitizing a first signal at the end of one information bit time from the output of said receiver to generate a first data signal; comparing the first data signal during the one information bit time to an adaptive average to determine whether coarse correlation has been achieved; computing the adaptive average by adding a first portion of the first data signal to a second portion of previously computed adaptive average in response to tee first data signal not achieving coarse correlation; shifting a chip code phase shifter by a third portion of one information bit time in response to the first data signal achieving coarse correlation; sampling and digitizing a second signal from the output of said receiver to generate a second data signal; comparing the second data signal during one information bit time to the adaptive average to determine whether fine correlation has been achieved; shifting a chip code phase shifter by a fourth portion of one information bit time in response to the second data signal not achieving fine correlation; and initiating a data capture algorithm in response to the second data signal achieving fine correlation.
Claim 7
Independent Claim 243 words
A method of using a processor for synchronizing the timing acquisition of a spread spectrum signal received by a receiver, the spread spectrum signal having a plurality of information bits with each information bit including a plurality of chips from a spread spectrum chip code, comprising the steps, performed by said processor, of: sampling and digitizing a first signal at the end of one information bit time from the output of said receiver to generate a first data signal; comparing the first data signal during the one information bit time to an adaptive average to determine whether coarse correlation has been achieved; computing the adaptive average by adding a first portion of the first data signal to a second portion of previously computed adaptive average in response to tee first data signal not achieving coarse correlation; shifting a chip code phase shifter by a third portion of one information bit time in response to the first data signal achieving coarse correlation; sampling and digitizing a second signal from the output of said receiver to generate a second data signal; comparing the second data signal during one information bit time to the adaptive average to determine whether fine correlation has been achieved; shifting a chip code phase shifter by a fourth portion of one information bit time in response to the second data signal not achieving fine correlation; and initiating a data capture algorithm in response to the second data signal achieving fine correlation.
Claim 8
Independent Claim 151 words
A method of using a process for synchronizing timing acquisition of a spread spectrum signal received by a receiver, the spread spectrum signal having a plurality of information bits with each information bit including a plurality of chips from a spread spectrum chip code, comprising the steps, performed by said processor, of: sampling and digitizing a first signal at the end of one information bit time from the output of said receiver to generate a first data signal; comparing the first data signal during the one information bit time to an adaptive average to determine whether coarse correlation has been achieved; computing the adaptive average by adding a first portion of the first data signal to a second portion of previously computed adaptive average in response to the first data signal not achieving coarse correlation; and initiating a data capture algorithm in response to the second data signal achieving fine correlation.
Claim 9
Independent Claim 151 words
A method of using a process for synchronizing timing acquisition of a spread spectrum signal received by a receiver, the spread spectrum signal having a plurality of information bits with each information bit including a plurality of chips from a spread spectrum chip code, comprising the steps, performed by said processor, of: sampling and digitizing a first signal at the end of one information bit time from the output of said receiver to generate a first data signal; comparing the first data signal during the one information bit time to an adaptive average to determine whether coarse correlation has been achieved; computing the adaptive average by adding a first portion of the first data signal to a second portion of previously computed adaptive average in response to the first data signal not achieving coarse correlation; and initiating a data capture algorithm in response to the second data signal achieving fine correlation.

References Cited (Backward Citations)

US4361890A Cited
US4193030A Cited
US4241447A Cited
US4351064A Cited
US4225939A Cited
US4317204A Cited
US4225935A Cited
US4222115A Cited
US4313211A Cited
US4360801A Cited
US4468784A Cited
US4392220A Cited
US4455651A Cited
US4418393A Cited
US4361891A Cited
US4400790A Cited
US4435821A Cited
US4387465A Cited
US4425661A Cited
US4511887A Cited
US4583090A Cited
US4517600A Cited
US4470145A Cited
US4472814A Cited
US4661804A Cited
US4484335A Cited
US4475215A Cited
US4550312A Cited
US4530008A Cited
US4594580A Cited
US4734680A Cited
US4728935A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-03-10 1995-09-09 1996-03-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-03-10 1999-09-09 2000-03-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-03-10 2003-09-09 2004-03-10 $7700.00 Window Closed / Lapsed

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