Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and method for achieving receiver diversity.SOLUTION: A wireless unit 400 includes a plurality of antennas 410, an antenna selector 430 to select one or more antennas from the plurality of antennas 410, and a processor 450 with input data from an inertial sensor 470 for monitoring the orientation of the wireless unit 400. Responsive to the input data from the inertial sensor 470, the processor 450 commands the antenna selector 430 to select one or more antennas. In one aspect, the processor 450 is a diversity processor that computes a combination of signals received on the antennas responsive to the input data from the inertial sensor 470. In another aspect, the wireless unit 400 further includes a baseband processor to process the output of the diversity processor for a particular unit application.
Abstract:
PROBLEM TO BE SOLVED: To provide systems, methods and apparatus for frequency control.SOLUTION: A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.
Abstract:
PROBLEM TO BE SOLVED: To provide systems, methods, and apparatus for a frequency control.SOLUTION: A receiver according to one embodiment includes a frequency control unit configured to receive a stream of samples including a plurality of received instances of a transmitted signal. The frequency control unit is configured to output a first correction signal (e.g. indicating a rotation) that is based on more than one of the received instances and a second correction signal (e.g. to control an oscillator) that is also based on more than one of the received instances. In some embodiments, a controlled oscillator is used to receive and/or transmit another signal, such as a signal received from a GPS space vehicle. In other embodiments, the received instances are from a GPS signal. In further embodiments, a fixed-frequency oscillator is used, and the second correction signal is used to receive and/or transmit another signal, such as a GPS signal.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system that derive a seed position of a subscriber station in support of an unassisted GPS-type position determination in a wireless communication system. SOLUTION: In the method and system for deriving a seed position of a subscriber station in the wireless communication system in supporting the unassisted GPS-type position determination, the subscriber station receives overhead messages from the wireless communication system, and derives the seed position from the parameter values. The subscriber station can use a data structure in its memory and map possible parameter values to corresponding positions that may serve as the seed positions. The data structure can be renewed according to renewal conditions. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To achieve position determination in a wireless communication system with detection and compensation for repeaters. SOLUTION: In order to detect whether or not a remote terminal is under the coverage of a repeater in a wireless communication network, techniques may be based on (1) a list of base stations expected to be received under the coverage of the repeater and (2) a characterized environment of the repeater or (3) a propagation delay for a transmission received at the remote terminal. Additional ambiguity resulting from being under the coverage of the repeater may be also accounted for or compensated by (1) discarding time measurements from repeated base stations, (2) adjusting processing for position estimates, and (3) computing a series of position estimates based on multiple transmissions received from the same originating base station and selecting the best estimate, or (4) computing a series of position estimates based on multiple transmissions from multiple originating base stations and selecting the best estimate. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A method according to an embodiment obtains a list of peaks for each of a number of frequency hypotheses. Each peak has an energy result and corresponds to a code phase hypothesis. Embodiments include methods and apparatus that may be used in identifying a location of a signal (such as a GPS signal) in a two-dimensional search space. Location information may be further applied to operations such as signal acquisition, signal tracking, position location of a receiver, and timing operations such as the synchronization of one or more other processes.
Abstract:
Methods and systems are provided for determining a position of a subscriber station in a wireless communications system. The subscriber station receives an overhead message from the wireless communications system and obtains a parameter value. A data structure stored in memory of the subscriber station is then accessed and a seed position is set to a stored position from an entry of the data structure associated with a value matching the parameter value obtained from the received overhead message. The position of the subscriber station is then determined from a set of signals from a satellite position determination system based on the set seed position.
Abstract:
An assisted wireless position determination system includes a plurality of base stations and a plurality of wireless devices, such as mobile telephones and personal digital assistants, adapted to communicate with the base stations. The wireless position determination system also includes a position determination system for determining the geographic position of the wireless devices. The position determination system includes a position determination entity (PDE) that is connected to the base stations and serves as a processing server for computing the position of the wireless devices. The system and method reduces or eliminates redundant and superfluous data. In addition, the system and method ensure that the wireless device is not loaded with additional capacity, and that the wireless device is provided with precise location information. The embodiment of the system and method of the invention are compliant with the TIA/EIA IS-801 standard or other standards
Abstract:
A system, method and apparatus for providing location services whereby location determination and location disclosure are treated as separate and independent processes. Location determination may be performed (as necessary) via a first set of network entities to obtain location information for a mobile station. The location information may be cached for subsequent disclosure to any number of applications. Location disclosure may be performed (when requested) via a second set of network entities to provide the location information. Location determination may utilize a first security procedure for authorization and to obtain a first session key used for location determination. Location disclosure may utilize a second security procedure for authorization and to obtain a second session key used for location disclosure. For a roaming mobile station, location determination may be performed via a serving network and location disclosure may be performed via a home network.