摘要:
Mobile station positioning is implemented using various methods and devices. According to one example embodiment of the present invention, an azimuth angle estimation of the location of a mobile station is accomplished using a radio-signal processing apparatus. The azimuth angle is estimated with respect to a nearby base station that covers a service area using common sectorization via multiple directional antennas respectively transmitting at different azimuth angles. The apparatus has a memory for storing information that associates directional sector antennas of the nearby base station and expected antenna radiation gains in the common sectorization service area corresponding to locations relative to the nearby base station. The apparatus also includes a processor arrangement that determines received signal strengths of respective signals received from different ones of the directional sector antennas of the nearby base station and that determines estimated azimuth angles by comparing the stored information with the received signal strengths.
摘要:
A method and an apparatus for acquiring an ultra-fast global navigation satellite systems (GNSS) initial position with peer assistance are disclosed. The apparatus includes a communication unit configured to receive assistance generated using a distance from a master terminal to a slave terminal and frequency error of a counterpart's terminal, a communication signal system configured to immediately receive immediately necessary information of the assistance, a Global Positioning System (GPS) receiver configured to rapidly search for a GPS satellite signal using the assistance and continuously track the GPS satellite signal so as to extract a pseudorange, and a computation processor configured to compute the position of the slave terminal using the assistance and the pseudorange. By this configuration, it is possible to perform fast initial position measurement as compared to the existing A-GPS technique, achieve direct communication between two GPS receivers regardless of presence/absence of a mobile communication network, and solve various limitations of the A-GPS technique.
摘要:
Systems and methods for an item placement configuration optimization are provided. A system and method can include receiving a first selection including two or more first items corresponding to a first level in an item placement configuration. A first score is determined for the first selection by applying an algorithm to data corresponding to the first items. A second selection including two or more second items and corresponding to a second level in the item placement configuration is received. A second score for the second selection is determined by applying an algorithm to the first score and data corresponding to the second items.
摘要:
A device and method for locating a mobile station (MS) in a mobile communication system. In the MS locating device for an MS which receives signals synchronized to a predetermined time from at least one adjacent base station (BS) and is located within a serving BS of the at least one BS, an analog to digital converter (ADC) converts the received BS signals to digital chip sample data, a memory stores the chip sample data, a dedicated searcher detects at least two signals by correlating the chip sample data received from the memory by off-line processing and calculates the signal-to-interference ratios (SIRs) and time difference of arrival (TDOA) of the two signals, and a controller estimates the MS location based on the SIRs and TDOA received from the dedicated searcher.
摘要:
A device and method for locating a mobile station (MS) in a mobile communication system. In the MS locating device, a first antenna and a second antenna of a base station (BS) are spaced from each other by a distance equivalent to a wavelength of an MS transmission channel multiplied by a predetermined coefficient, such as one half. A first frequency downconverter and a second frequency downconverter convert signals received from the first and second antennas to baseband signals and digitize the baseband signals to chip sample data. A first channel demodulator and a second channel demodulator recover the chip sample data received from the first and second frequency downconverters and output information about the symbol start and PN code of a specific MS signal. A controller outputs a PN code for identifying the specific MS and finger position information based on the symbol start and PN code information received from the first and second demodulators. In addition, the controller may be supplied with orthogonal code information from the demodulator; in this case, the controller will output information concerning the specific Walsh code. A symbol data extractor extracts two symbols of the specific MS from the chip sample data received from the first and second frequency downconverters based on the PN code and finger position information. An incident angle estimator estimates the incident angle of the received signal from the phase difference between the extracted two symbols. A location estimator estimates the location of the specific MS based on the estimated incident angle and the round trip delay (RTD) measured for the MS.
摘要:
Techniques are provided for frequency and/or timing synchronization of a small base station with a network. In one example, small base station may be configured to detect a macro signal of a macro base station, and set a frequency reference based at least in part on the macro signal, in response to the macro signal being available in a different band than that for the small base station. The small base station may be configured to set the frequency reference based at least in part on a Global Positioning System (GPS) signal, in response to detecting that the different band macro signal is not available.
摘要:
Methods and apparatuses are provided which may be adapted for use in and/or with mobile device positioning systems and/or the like. In an example, a method may include accessing a plurality of measurements associated with a plurality of location signals as received by the mobile device from at least a first portion of a plurality of transmitters. The method may include dynamically establishing at least one location signal transmission parameter based, at least in part, on the plurality of measurements. The location signal transmission parameter(s) may be adapted for use by at least a second portion of the plurality of transmitters to operatively initiate subsequent transmission of an additional plurality of location signals adapted to be received by the mobile device.
摘要:
A spread-spectrum signal receiver, a multipath signal super-resolution method thereof, and a recording medium thereof are disclosed. Using a least-squares based iterative multipath super-resolution (LIMS) algorithm, the spread-spectrum signal receiver accurately resolves multipath signals in a multipath channel environment so as to extract necessary information such that a rake receiver tracks the multipath signals more accurately. Since the LIMS technique has high resistance against noise and require less computation, it may be used to resolve the multipath signals in real time and to extract a first arrival path signal of a first arrival signal and may be easily implemented offline.
摘要:
A power control bit inserting method between a base station and a terminal. The base station and the terminal each use a plurality of adjacent frequency bands as signal paths with independent signal paths of a real part and an imaginary part given to each frequency. In the power control bit inserting method, a unit time is set to a power control group period, n-bit data is allocated to each signal path, the power control group period is divided by the number of signal paths, and a power control bit is inserted in each divided segment, so that the insertion positions in the real and imaginary parts of each frequency are spaced from each other by n/2 bit and the start position of the real signal path of each frequency is inserted at an appointed bit position of the corresponding frequency.