Patent US5131006A successfully refreshed from Google Patents.
US5131006A
Expired / Lapsed
US
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Carrier detection for a wireless local area network
Assignee: Mosaid Technologies Inc
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Filing: 1990-12-24
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Granted: 1992-07-14
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Expires: 2010-12-24
Abstract
Abstract A local area network (10) utilizes a wireless transmission link and has network stations (12) each having two differently polarized antennas (14, 16). Data transmission utilizes a spread spectrum code and in the receiver, correlator outputs are utilized in an integrator and registers circuit (54) to provide correlator output sample values integrated over a plurality of symbol intervals. These values are stored in registers (156) the contents of which are utilized to determine a peak value and a total value which are applied to a spike quality determination circuit (78) including a look-up table (200). The resultant spike quality output value represents the quality of the received signal and is utilized for carrier detection and for antenna selection.
Inventors
- 👤 Adriaan Kamerman
- 👤 Hans van Driest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:09
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/709; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
153 words
A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel, comprising: an analog-to-digital conversion means to provide a digital representation of a received signal; correlator means coupled to said analog-to-digital conversion means to provide a plurality of signal samples; integrator and storage means including a plurality of storage registers to store values of integrated representations of said plurality of signal samples; peak determining means to determine the maximum value stored in said plurality of storage registers; total value determining means to determine the total value of the values stored in said plurality of storage registers; spike quality determining means to provide a quality value signal representative of the quality of said received signal, with said quality being dependent upon said maximum value and said total value; and carrier detection means responsive to said quality value signal to provide a carrier detect signal.
Claim 2
Dependent Claim
153 words
A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel, comprising: an analog-to-digital conversion means to provide a digital representation of a received signal; correlator means coupled to said analog-to-digital conversion means to provide a plurality of signal samples; integrator and storage means including a plurality of storage registers to store values of integrated representations of said plurality of signal samples; peak determining means to determine the maximum value stored in said plurality of storage registers; total value determining means to determine the total value of the values stored in said plurality of storage registers; spike quality determining means to provide a quality value signal representative of the quality of said received signal, with said quality being dependent upon said maximum value and said total value; and carrier detection means responsive to said quality value signal to provide a carrier detect signal.
Claim 3
Dependent Claim
34 words
The local area network station as claimed in claim 1 in which said spike quality determining means includes a look-up table addressable by address signals dependent on said maximum value and said total value.
Claim 4
Dependent Claim
71 words
The local area network station as claimed in claim 1 in which said correlator means includes: first and second correlators having outputs corresponding to in-phase and quadrature component signals, respectively; and conversion means coupled to the outputs of said first and second correlators to convert the outputs therefrom to an amplitude signal representation and a phase signal representation, with said amplitude signal representation applied to said integrator and storage register means.
Claim 5
Dependent Claim
41 words
The local area network station as claimed in claim 3 in which said integrator and storage register means includes a leaky integrator to receive said plurality of signal samples, with said leaky integrator being coupled to said plurality of storage registers.
Claim 6
Dependent Claim
54 words
The local area network station as claimed in claim 3 in which said carrier detection means includes: first threshold means to be operated in response to said quality value signal exceeding a first predetermined value; and second threshold means to be operated in response to said quality value signal equaling a second predetermined value.
Claim 7
Dependent Claim
45 words
The local area network station as claimed in claim 5 in which said station further comprises: first and second antennas; switching means to selectively render said first and second antennas operative; and switching control means to operate said switching means for successive antenna slot intervals.
Claim 8
Dependent Claim
21 words
The local area network station as claimed in claim 6 in which said first and second antennas have different polarization directions.
Claim 9
Dependent Claim
21 words
The local area network station as claimed in claim 6 in which said first and second antennas have different orientation directions.
Claim 10
Dependent Claim
53 words
The local area network station as claimed in claim 7 in which said switching control means controls the selection of said first or second antenna in dependence on relative quality value signals provided by said spike quality determining means during successive slot intervals in which said first and second antennas are successively operative.
Claim 11
Dependent Claim
53 words
The local area network station as claimed in claim 8 in which said switching control means controls the selection of said first or second antenna in dependence on relative quality value signals provided by said spike quality determining means during successive slot intervals in which said first and second antennas are successively operative.
Claim 12
Dependent Claim
35 words
The local area network station as claimed in claim 6 in which said spike quality determination means is operative for a predetermined number of symbol periods occurring at the end of an antenna slot interval.
Claim 13
Dependent Claim
88 words
In apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, a method for processing the received signal, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; and (e) determining a spike quality value based on said peak value and said total value.
Claim 14
Dependent Claim
88 words
In apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, a method for processing the received signal, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; and (e) determining a spike quality value based on said peak value and said total value.
Claim 15
Dependent Claim
103 words
In apparatus for receiving data symbols encoded in a spread spectrum code, and transmitted using a carrier signal on a wireless communication channel, a method for carrier signal detection, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to detect the reception of said carrier signal.
Claim 16
Dependent Claim
103 words
In apparatus for receiving data symbols encoded in a spread spectrum code, and transmitted using a carrier signal on a wireless communication channel, a method for carrier signal detection, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to detect the reception of said carrier signal.
Claim 17
Independent Claim
109 words
A method of operating apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, said apparatus including a plurality of antennas, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to select one of said plurality of antennas for signal reception.
Claim 18
Independent Claim
109 words
A method of operating apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, said apparatus including a plurality of antennas, including the steps of: (a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to select one of said plurality of antennas for signal reception.
References Cited (Backward Citations)
EP0279080A2
Cited
GB2203303A
Cited
EP0286366A2
Cited
GB2211053A
Cited
US4995052A
Cited
EP0318665A2
Cited
EP0343538A2
Cited
EP0352787A2
Cited
US5031191A
Cited
US5038362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |