METHOD AND SYSTEM FOR LOCATION ESTIMATION
First Claim
1. A location estimation method comprising:
- performing a wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively, at one or more floors from among a plurality of floors within a multi-floor environment;
computing a first set of received signal strength indication (RSSI) measurements corresponding to the wireless signals;
determining absolute floor location information in the multi-floor environment based on the first set of RSSI measurements and a pre-defined objective function, the pre-defined objective function configured to maximize a probability of a user being located at a floor from among the plurality of floors so as to receive the wireless signals corresponding to the first set of RSSI measurements, wherein the probability is estimated based on a three-dimensional channel model comprising a plurality of channel model parameters;
determining a user floor location based on the absolute floor location information; and
estimating the user location in the multi-floor environment based at least in part on the user floor location.
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Abstract
Several systems and methods for location estimation in a multi-floor environment are disclosed. In an embodiment, the method includes performing wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively at one or more floors from among a plurality of floors within the multi-floor environment. A first set of RSSI measurements is computed corresponding to the wireless signals. Absolute floor location information is determined based on the first set of RSSI measurements and a pre-defined objective function. The pre-defined objective function is configured to maximize a probability of a user being located at a floor so as to receive the wireless signals. A user floor location is determined based on the absolute floor location information. The user location is estimated at least in part based on the user floor location.
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Citations
20 Claims
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1. A location estimation method comprising:
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performing a wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively, at one or more floors from among a plurality of floors within a multi-floor environment; computing a first set of received signal strength indication (RSSI) measurements corresponding to the wireless signals; determining absolute floor location information in the multi-floor environment based on the first set of RSSI measurements and a pre-defined objective function, the pre-defined objective function configured to maximize a probability of a user being located at a floor from among the plurality of floors so as to receive the wireless signals corresponding to the first set of RSSI measurements, wherein the probability is estimated based on a three-dimensional channel model comprising a plurality of channel model parameters; determining a user floor location based on the absolute floor location information; and estimating the user location in the multi-floor environment based at least in part on the user floor location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A location estimation system comprising:
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a transceiver module configured to perform a wireless scanning so as to receive wireless signals from one or more access points from among a plurality of access points positioned at plurality of locations, respectively, at one or more floors from among a plurality of floors within a multi-floor environment; and a location estimation module communicatively associated with the transceiver module and configured to; compute a first set of received signal strength indication (RSSI) measurements corresponding to the wireless signals; determine absolute floor location information in the multi-floor environment based on the first set of RSSI measurements and a pre-defined objective function, the pre-defined objective function configured to maximize a probability of a user being located at a floor from among the plurality of floors so as to receive the wireless signals corresponding to the first set of RSSI measurements, wherein the probability is estimated based on a three-dimensional channel model comprising a plurality of channel model parameters; determine a user floor location based on the absolute floor location information; and estimate the user location in the multi-floor environment based at least in part on the user floor location. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A location estimation system comprising:
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a transceiver module configured to receive a user floor location and associated floor location uncertainty estimate within a multi-floor environment; and a location estimation module communicatively associated with the transceiver module and configured to; generate an imaginary two-dimensional grid across the user floor location; and compute a two-dimensional location estimate within the user floor location along with associated uncertainty measure based on RSSI measurements corresponding to wireless signals received from at least one of access points positioned in the user floor location and access points positioned in the vicinity of the user floor location, wherein the two-dimensional location estimate is computed based on MMSE algorithm configured to compute weighted probabilities of a user being located at various positions in the imaginary two-dimensional grid. - View Dependent Claims (20)
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Specification