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公开(公告)号：EP1454161A2
公开(公告)日：2004-09-08
申请号：EP02792387.9
申请日：2002-12-12
发明人： RICK, Roland, R. , STEIN, Jeremy , AMERGA, Messay , FERNANDEZ-CORBATON, Ivan , RISTIC, Borislav , BHATIA, Ashok
IPC分类号： G01S5/14
CPC分类号： H04W64/00 , G01S5/0257 , G01S19/48
摘要： A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.
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公开(公告)号：EP1454161B1
公开(公告)日：2011-06-29
申请号：EP02792387.9
申请日：2002-12-12
发明人： RICK, Roland, R. , STEIN, Jeremy , AMERGA, Messay , FERNANDEZ-CORBATON, Ivan , RISTIC, Borislav , BHATIA, Ashok
IPC分类号： G01S5/14
CPC分类号： H04W64/00 , G01S5/0257 , G01S19/48
摘要： A position determination system and apparatus for utilizing a network of cellular base stations to determine position of a mobile station includes taking a plurality of statistically independent data measurements of the pilot signals from the base stations. Each of the data measurements includes an earliest time of arrival, providing multiple independent measurements for each of the pilot signals. For each cellular base station, a representative measurement is calculated responsive to the independent measurements, which is used to determine position of the mobile station using an AFLT algorithm and/or in conjunction with a GPS algorithm. In some embodiments, the data measurements for each pilot signal further include an RMSE estimate and time of measurement for each time of arrival, and an energy measurement for all resolvable paths. If the mobile station comprises a cell phone, a cell search list and a GPS search list may be provided by a cell base station.
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公开(公告)号：EP1442316A2
公开(公告)日：2004-08-04
申请号：EP02802497.4
申请日：2002-10-29
发明人： STEIN, Jeremy, M. , FERNANDEZ-CORBATON, Ivan , RICK, Roland, R. , RISTIC, Borislav , BHATIA, Ashok , AMERGA, Messay
IPC分类号： G01S5/14
CPC分类号： G01S19/24 , G01S5/0215 , G01S5/0221 , G01S19/21 , G01S19/31 , G01S19/46
摘要： A parameter estimator for estimating one or more parameter(s) from a correlation function derived from a signal using a dynamically variable integration time is described. The parameter estimator may be employed in a subscriber station to estimate the time of arrival of one or more base station or sector pilot signals in a wireless communication system. This information may be utilized in an overall advanced forward link trilateration (AFLT) process for estimating the location of the subscriber station.
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4.发明授权METHOD AND APPARATUS FOR COMBINED SPATIAL AND TEMPORAL SIGNAL EQUALIZATION IN A COMMUNICATION SYSTEM WITH MULTIPLE RECEIVER ANTENNAS 有权方法和装置组合的空间和时间信号均衡在具有多个接收天线的通信系统
公开(公告)号：EP1413070B1
公开(公告)日：2008-10-01
申请号：EP02756726.2
申请日：2002-07-25
CPC分类号： H04B7/0854 , H04B7/0845 , H04L1/0618
摘要： A communication receiver (400) minimizes a combined local and global mean square error for signal equalization. A base station (101) or a mobile station (102-104) may include a plurality of antennas (292) for receiving a plurality of signals transmitted from a common source. The plurality of signals carry a common stream of data symbols. A pre-processing block (299) processes the received signals to produce a plurality of processed received signals (298). A signal equalizer (401) minimizes a combined local and global MSE over the processed received signals (298) to produce a combined signal (499). A decoder decodes the combined signal (499) to retrieve the stream of data symbols. A processor is configured for combining a local MSE and a global MSE in accordance with an adjustable weighting factor a to produce the combined local and global MSE.
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公开(公告)号：EP1864529A1
公开(公告)日：2007-12-12
申请号：EP06748938.5
申请日：2006-03-28
发明人： FERNANDEZ-CORBATON, Ivan , JALALI, Ahmad , OZAKI, Ernest, T. , SIMON, Harris, Smith , GREGORY, Sherman, A.
CPC分类号： H01Q25/00
摘要： At least one feature provides a way to perform point-to-multipoint transmissions using adaptive or directional antennas while reducing antenna pattern distortion. Generally, rather than transmitting the same waveform to two or more receivers, an information-bearing signal is transformed into different decorrelated waveforms and each deσorrelated waveform is transmitted to a different receiver. In one implementation, an information-bearing signal is transformed into two decorrelated signals (Sl (t) , S2 (t) ) such that their crosscorrelation, or autocorrelation of the information-bearing signal, is zero or very small . Such decorrelation may be achieved by sending a first signal to a first receiver (104) while sending a second signal, having a radio frequency spectrum that is the spectrally inverted version of the first signal, to a second receiver (106) . In another implementation, a first signal is transmitted to a first receiver (104) and is also transmitted to a second receiver (106) with a time delay.
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6.发明授权SYSTEM AND METHOD OF ESTIMATING EARLIEST ARRIVAL OF CDMA FORWARD LINK SIGNALS 有权用于估计CDMA的最早到达的方法和系统信号连接FORWARD
公开(公告)号：EP1413163B1
公开(公告)日：2005-01-12
申请号：EP02748258.7
申请日：2002-07-25
CPC分类号： H04B1/7115 , H04B1/7113 , H04B1/7117
摘要： A system and method for estimating the earliest signal arrival in a wireless communication system, is presented herein. In accordance with an embodiment of the invention, the system includes a base station that transmits a plurality of pilot signals and a mobile station configured to receive a plurality of signals corresponding to one of the transmitted pilot signals. The mobile station includes a receiver containing a searcher correlating mechanism and at least one finger correlating mechanism. The mobile station receiver detects the arrival times and energy levels of the received signals and constructs a searcher histogram and a finger histogram representing an arrival time distribution of samples corresponding to the received signals. The mobile station then generates a delay index for each of the estimated early signal arrivals and forwards the delay indices to the base station or a position determination entity to select the minimum delay index corresponding to the earliest signal arrival.
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公开(公告)号：EP1454419A1
公开(公告)日：2004-09-08
申请号：EP02734738.4
申请日：2002-06-06
IPC分类号： H04B1/707
CPC分类号： H04W64/00 , G01S5/02 , G01S5/0221
摘要： A system and method for accurately determining time of arrival using a mathematical model that mimics a correlation function. A correlation value is sampled at a predetermined periodic interval and a maximum correlation value, coinciding with a particular point in time, is determined. The mathematical model uses the maximum measured correlation value and correlation values at adjacent sample points to determine coefficients for the selected mathematical model. The coefficients may be calculated and used to determine the actual peak, which may fall in-between the sample points. The actual peak value is used to accurately determine the time of arrival of a signal. Time of arrival signals from a plurality of remote transmitters are used along with conventional triangulation techniques to accurately determine the location of the wireless unit.
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公开(公告)号：EP1444531A2
公开(公告)日：2004-08-11
申请号：EP02793872.9
申请日：2002-11-01
IPC分类号： G01S1/04
CPC分类号： H04W64/00 , G01S5/0205 , G01S5/0215
摘要： A method of producing a reliability metric for a parameter estimate derived from a signal using correlation analysis is described. The method begins by obtaining an indication of whether a non line of sight signal condition is present or likely. Responsive to one or both of these indications, the method derives a reliability metric for the parameter estimate. In one embodiment, the parameter estimate is an estimate of time of arrival (TOA) of the signal, and the reliability metric is root mean square error (RMSE) of the time of arrival estimate. This embodiment obtains an indication of whether a non line of sight signal condition is present or likely based on a measure of the strength of the correlation function at the peak thereof. The measure of the strength of the correlation function at the peak thereof may be energy per chip divided by total received power (Ec/I0) or may simply be the raw energy of the correlation function at the peak. The RMSE metric which is computed in this embodiment varies inversely with the peak strength of the correlation function.
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9.发明公开SYSTEM AND METHOD OF ESTIMATING EARLIEST ARRIVAL OF CDMA FORWARD LINK SIGNALS 有权用于估计CDMA的最早到达的方法和系统信号连接FORWARD
公开(公告)号：EP1413163A1
公开(公告)日：2004-04-28
申请号：EP02748258.7
申请日：2002-07-25
CPC分类号： H04B1/7115 , H04B1/7113 , H04B1/7117
摘要： A system and method for estimating the earliest signal arrival in a wireless communication system, is presented herein. In accordance with an embodiment of the invention, the system includes a base station that transmits a plurality of pilot signals and a mobile station configured to receive a plurality of signals corresponding to one of the transmitted pilot signals. The mobile station includes a receiver containing a searcher correlating mechanism and at least one finger correlating mechanism. The mobile station receiver detects the arrival times and energy levels of the received signals and constructs a searcher histogram and a finger histogram representing an arrival time distribution of samples corresponding to the received signals. The mobile station then generates a delay index for each of the estimated early signal arrivals and forwards the delay indices to the base station or a position determination entity to select the minimum delay index corresponding to the earliest signal arrival.
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10.发明公开METHOD AND APPARATUS FOR COMBINED SPATIAL AND TEMPORAL SIGNAL EQUALIZATION IN A COMMUNICATION SYSTEM WITH MULTIPLE RECEIVER ANTENNAS 有权方法和装置组合的空间和时间信号均衡在具有多个接收天线的通信系统
公开(公告)号：EP1413070A1
公开(公告)日：2004-04-28
申请号：EP02756726.2
申请日：2002-07-25
CPC分类号： H04B7/0854 , H04B7/0845 , H04L1/0618
摘要： A communication receiver (400) minimizes a combined local and global mean square error for signal equalization. A base station (101) or a mobile station (102-104) may include a plurality of antennas (292) for receiving a plurality of signals transmitted from a common source. The plurality of signals carry a common stream of data symbols. A pre-processing block (299) processes the received signals to produce a plurality of processed received signals (298). A signal equalizer (401) minimizes a combined local and global MSE over the processed received signals (298) to produce a combined signal (499). A decoder decodes the combined signal (499) to retrieve the stream of data symbols. A processor is configured for combining a local MSE and a global MSE in accordance with an adjustable weighting factor a to produce the combined local and global MSE.
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