Interference suppression for wireless local area network and location system
First Claim
1. A wireless local area network system comprising:
- a plurality of access point stations that receive and transmit communication signals within a wireless local area network;
a mobile station in communication with a plurality of access point stations;
a processor operatively connected to each of the access point stations and operative for processing communication signals received from the mobile station and determining which communication signals are first-to-arrive signals and conducting differentiation of the first-to-arrive signals to locate a mobile station and weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighted functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference.
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Accused Products
Abstract
A wireless local area network and location system for locating objects within a monitored environment are disclosed. A plurality of access point stations receive and transmit communication signals within a wireless local area network. A processor is operatively connected to each of the access point stations and operative for processing communication signals received from the mobile station and, in one embodiment, determining which communication signals are first-to-arrive signals and conducting differentiation of the first-to-arrive signals to locate a mobile station. Delayed versions of at least one interference signal are weighted and the amplitude and phase controlled with weighted functions W1, W2 . . . Wn. The resultant weighted replicas are summed to determine an approximation of disbursed interference for cancelling interference. The location system can include a tag transmitter and spaced monitoring receivers and processor.
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Citations
35 Claims
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1. A wireless local area network system comprising:
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a plurality of access point stations that receive and transmit communication signals within a wireless local area network;
a mobile station in communication with a plurality of access point stations;
a processor operatively connected to each of the access point stations and operative for processing communication signals received from the mobile station and determining which communication signals are first-to-arrive signals and conducting differentiation of the first-to-arrive signals to locate a mobile station and weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighted functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless local area network system comprising:
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a plurality of access point stations that receive and transmit communication signals within the wireless local area network, said access point stations further comprising a system antenna and an interference receiving antenna directed for receiving an interference signal;
a mobile station in communication with a plurality of access point stations;
a processor operatively connected to each access point station for processing communication signals received from the mobile station and determining which communication signals are first-to-arrive signals and conducting differentiation of first-to-arrive signals to locate a mobile station;
a tapped delay line, summer, controller, and interference detector circuit operatively connected to said system and interference receiving antenna for weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighting functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A location system for locating objects within a monitored environment comprising:
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a tag transmitter associated with each object within the monitored environment and operative to transmit a signal encoded with information representative of the identification of the object;
a plurality of spaced monitoring receivers for receiving signals from tag transmitters; and
a processor operative with each of said monitoring receivers for receiving and processing signals received from tag transmitters for determining which signals are first-to-arrive signals and conducting differentiation of the first-to-arrive signals to locate an object and associated tag and weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighting functions W1, W2, . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A location system for locating objects within a monitored environment comprising:
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a tag transmitter associated with each object within the monitored environment and operative to transmit a signal encoded with information representative of the identification of the object;
a plurality of spaced monitoring receivers for receiving signals from tag transmitters and each including a system antenna and interference receiving antenna;
a processor operative with each of said spaced monitoring receivers for receiving and processing signals received from tag transmitters for determining which signals are first-to-arrive signals and conducting differentiation of the first-to-arrive signals to locate an object and associated tag; and
a tapped delay line, summer, controller and interference detector circuit operatively connected to said system antenna and interference receiving antenna for weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighting functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (24, 25, 26)
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27. A wireless local area network system comprising:
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a plurality of access point stations that receive and transmit communication signals within a wireless local area network;
a processor operatively connected to each of the access point stations and operative for processing communication signals received from a mobile station in communication therewith and determining first-to-arrive signals from a mobile station and conducting differentiation of the first-to-arrive signals for locating the mobile station and weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighted functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A wireless local area network system comprising:
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a plurality of access point stations that receive and transmit communication signals within the wireless local area network from a mobile station in communication therewith;
said access point stations further comprising a system antenna and an interference receiving antenna directed for receiving an interference signal;
a tapped delay line, summer, controller and interference detector circuit operatively connected to said system and interference receiving antenna for weighting delayed versions of at least one interference signal by controlling amplitude and phase with weighting functions W1, W2 . . . Wn, and summing any resultant weighted replicas to determine an approximation of the dispersed interference for cancelling interference. - View Dependent Claims (35)
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Specification