1
Abraham Bar, Ravi Rajapakse, Mati Wax, Oliver A Hilsenrath: Internet distributed real-time wireless location database. Trafficmaster USA, Motorola, Townsend and Townsend and Crew, September 24, 2002: US06456852 (308 worldwide citation)

A system for easily and inexpensively distributing real time location information of cellular telephone users to various third party information subscribers comprises an HTTP server machine which maintains a dynamic database of current cellular users. The database has a list of caller entries, where ...


2
Mati Wax, Oliver Hilsenrath, Abraham Bar: Radio transmitter location finding in CDMA wireless communication systems. U S Wireless Corporation, Lumen IPS, June 19, 2001: US06249680 (197 worldwide citation)

A method and apparatus for location finding in a CDMA wireless communication system uses multipath signals in order to accurately determine a transmitter—s location. Direct path and multipath signals from a mobile transmitter arrive at an array of p antennas belonging to a cellular network base stat ...


3
Oliver Hilsenrath, Mati Wax: Radio transmitter location finding for wireless communication network services and management. U S Wireless Corporation, Lumen Intellectual Property Services, February 15, 2000: US06026304 (161 worldwide citation)

A method and apparatus for location finding in a wireless communication system uses multipath signals in order to accurately determine a transmitter's location. Direct path and multipath signals from a mobile transmitter [74] arrive at an antenna array [80, 82, 84] of a base station receiver [76]. T ...


4
Mati Wax, Sriram Jayaraman, Oliver Hilsenrath: Antenna array calibration in wireless communication systems. US Wireless Corporation, Lumen Intellectual Property Services, May 15, 2001: US06232918 (104 worldwide citation)

A method and apparatus are provided for easily and accurately calibrating an antenna array in a multipath environment. A calibration table containing spatial signature data together with corresponding location data is used to calibrate the antenna array, i.e. to determine the array response in vario ...


5
Mati Wax, Oliver Hilsenrath: Signature matching for location determination in wireless communication systems. US Wireless Corporation, Lumen Intellectual Property Services, August 29, 2000: US06112095 (85 worldwide citation)

A method and apparatus for wireless location finding determines a set of likely locations from a signal covariance matrix R, a set of array calibration vectors {a(.theta.)}, and a set of calibrated signal covariance matrices {R.sub.k } corresponding to calibrated locations. From these quantities, an ...


6
Mati Wax, Yan Meng, Oliver Hilsenrath: Subspace signature matching for location ambiguity resolution in wireless communication systems. US Wireless Corporation, Lumen Intellectual Property Services, May 16, 2000: US06064339 (69 worldwide citation)

A method and apparatus reduces the ambiguities in the determination of cellular telephone locations in a location finding system based on the use of multipath signals. A location finding base station determines a signal signature from a subspace of an array covariance matrix. The signature is compar ...


7
Mati Wax, Sriram Jayaraman, Vladimir Radionov, Gennadi Lebedev, Oliver Hilsenrath: Efficient storage and fast matching of wireless spatial signatures. US Wireless Corporation, Lumen Intellectual Property Services, August 15, 2000: US06104344 (60 worldwide citation)

A method for determining a geographical location from a measured wireless signal signature comprises calculating from the measured wireless signal signature a multi-dimensional signature vector, wherein each component of the vector measures a degree of coincidence between the measured wireless signa ...


8
Jorma I Rissanen, Mati Wax: Algorithm for constructing tree structured classifiers. International Business Machines Corporation, Mark A Haynes, Simon K Lee, January 12, 1988: US04719571 (51 worldwide citation)

In assigning features to nodes of a tree structured classifier and determining terminal nodes in response to a training set of objects each being determined by a plurality of features, a selected characteristic, such as a cost function based on the minimum description length, of the plurality of fea ...


9
Sriram Jayaraman, Mati Wax, Oliver A Hilsenrath: Calibration table generation for wireless location determination. US Wireless Corporation, Lumen Intellectual Property Services, August 8, 2000: US06101390 (47 worldwide citation)

A system and method is provided for processing a calibration table used in a wireless location finding system. The initial calibration table data comprises points partitioned into routes followed by moving vehicles, where each point comprises a wireless signal signature and corresponding geographica ...


10
Mati Wax, Oliver A Hilsenrath: Signature matching for location determination in wireless communication systems. US Wireless Corporation, Lumen Intellectual Property Services, August 22, 2000: US06108557 (39 worldwide citation)

A method and apparatus improves the accuracy of a wireless location finding system based on the use of multipath signal signatures. A location finding apparatus measures an array covariance matrix R of a signal. The covariance matrix is compared to a database of signatures comprising calibrated sign ...



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