Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatuses for position determination and other operations.SOLUTION: A mobile station 407 uses radio signals from a plurality of wireless networks (e.g., with different air interfaces and/or operated by different service providers) for position determination. Mobile stations are used to harvest statistical data about wireless access points (e.g., the locations of mobile stations that have received signals from the wireless access points, such as from cellular base stations, wireless local area network access points, repeaters for positioning signals, or other wireless communication transmitters) and to derive location information (e.g., positions and coverage areas of the wireless access points) for the wireless networks from the collected statistical data.
Abstract:
PROBLEM TO BE SOLVED: To provide a procedure for estimating a parameter of a local maximum or minimum of a function. SOLUTION: In a method of and system for estimating a parameter of a local maximum or minimum of a correlation function derived from a received signal, an interpolated local maximum or minimum is determined. An interpolation offset is then derived, including a deviation between a position of the interpolated local maximum or minimum of the function and a position of a sampled local maximum or minimum of the function. An estimated value of the parameter is derived from the interpolation offset. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatuses for position determination and other operations in a combination of a cellular phone network and a satellite positioning system (SPS) in a mobile station.SOLUTION: A mobile station uses wireless signals from a plurality of wireless networks, for position determination, and obtains time and/or frequency information. Further, mobile stations are used to harvest statistical data about wireless access points, namely, the locations of mobile stations that have received signals from cellular base stations, wireless local area network access points, repeaters for positioning signals, or other wireless communication transmitters, and to derive location information, namely, position and service area of the wireless access points, for the wireless networks from the collected statistical data.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for detecting an interfering multi-path condition. SOLUTION: A parameter is determined from a pulse of a correlation function derived from a received signal. The parameter is examined to determine if it is inconsistent with a non-interfering multi-path hypothesis. If so, an interfering multi-path condition is detected. In one example, a width test is used for detecting the interfering multi-path condition. By this test, the width of the pulse in energy offset selected from peak energy is determined. This pulse width is compared with the range of a possible width as the characteristic of non-interfering hypothesis. If this width is out of this range, the interfering multi-path condition is detected. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To reduce or eliminate redundant and superfluous data, and further, ensure that wireless devices are not loaded with additional capacity, and that the wireless devices are provided with precise position information.SOLUTION: An assisted wireless position determination system comprises 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 assisted wireless position determination system also comprises a position determination system for determining geographic positions of the wireless devices. The position determination system comprises a position determination entity (PDE) which is connected to the base stations and serves as a processing server for computing the positions of the wireless devices.
Abstract:
PROBLEM TO BE SOLVED: To allow a GPS receiver to receive an effective signal under a jammer environment.SOLUTION: A plurality of results are obtained by correlating a received code with a reference signal. A list of peaks of each of a plurality of frequency hypotheses is obtained. Each peak has an energy result and corresponds to a code phase hypothesis. A maximum peak is selected from among the peaks of the plurality of frequency hypotheses.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for deriving a seed position of a subscriber station in support of unassisted GPS-type position determination in a wireless communications system.SOLUTION: In a method and system for deriving a seed position of a subscriber station in a wireless communications system in supporting unassisted GPS-type position determination, the subscriber station receives overhead messages from the wireless communications system, and derives the seed position from parameter values. The subscriber station may 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 updated in accordance with update conditions.
Abstract:
PROBLEM TO BE SOLVED: To accurately demodulate signals for use in satellite positioning system (SPS).SOLUTION: The present invention comprises: an input for receiving a first input signal comprising a word of transmitted data; a differential phase shift key demodulator for performing processing of the first input signal with a differential phase shift key demodulation so as to obtain from the first input signal a first set of first soft decision information values corresponding to bit index positions in a word; and receiving a second input signal. In the present invention, the differential phase shift key demodulator further processes the second input signal with shift key demodulation so as to obtain from the second input signal a second set of second soft decision information values corresponding to bit index positions in the word of transmitted data, and a mathematical function is performed on the first and second sets of corresponding first and second soft decision information values so as to obtain a third set of substitute soft decision information values corresponding to respective bit index positions in the word of transmitted data.
Abstract:
PROBLEM TO BE SOLVED: To provide a turbo code interleaver using a linear congruential sequence. SOLUTION: The turbo code interleaver (100) using the linear congruential sequences is employed as a two-dimensional interleaver (16) in a turbo coder (10) including a first structure encoder and a second structure encoder (12, 14). The interleaver (16) and the first encoder (12) are each configured to receive input bits. The first encoder (12) generates output symbols (22, 24). The interleaver (16) sequentially receives the input bits by row. The second encoder (14) is configured to receive the interleaved bits from the interleaver. The second encoder (14) generates an output symbol (28). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide 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. SOLUTION: A method according to one embodiment includes obtaining a plurality of results by correlating a received code with a reference code. Each of the results corresponds to one of a plurality of code phase hypotheses and one of a plurality of frequency hypotheses. For each of the plurality of frequency hypotheses, a plurality of peaks are selected from among the results for the frequency hypotheses and a list on which the plurality of peaks selected are ordered is stored. COPYRIGHT: (C)2011,JPO&INPIT