MULTI-PATH COMPENSATION

OBJECT POSITIONING

RADIO STATION AND RADIO SYSTEM WITH MODELLING OF THE MULTIPATH TRANSMISSION

RADIO STATION WITH MULTI-WAY SIGNAL MODELLING

POSITIONING PROCEDURE AND - DEVICE

METHOD OF, AND APPARATUS FOR, DETERMINING POSITION

Radio station

A radio station ( 10 ) in which the value of parameters for a model of a received multipath signal are estimated, the model comprising a value representative of the perpendicular distance between the plane of the reflecting surfaces ( 40, 50 ) and the radio station. This perpendicular distance may be measured from the round trip delay of a sounding signal transmitted by the radio station. The amount of computation is reduced by applying constraints to the parameters, and these constraints may comprise this perpendicular distance. The constraints may also be a function of parameters such as the path length, angle of arrival or amplitude of the direct path signal, and the amplitude of reflections of the sounding signal. The values of the parameters may be estimated initially by analysis of the received signals, followed by a parameter estimation process. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation.

POSITIONING SYSTEM AND METHOD

METHOD OF, AND APPARATUS FOR, OPERATING A RADIO SYSTEM

OBJECT LOCATION

A positioning method uses backscattered signals from a radio station (10, 20) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database (37) to identify objects in the vicinity of the radio station (10, 20). © KIPO & WIPO 2007 ...

MULTIPATH MITIGATION

Positioning method and apparatus

In a GPS or GSM system using DSSS signals, accurate and robust time-of-flight signal processing is achieved by selection of leading-edge or correlation techniques based on a variety of tests and environmental conditions.

RADIO STATION WITH MULTIPATH SIGNAL MODELING

A radio station (10) in which the value of parameters for a model of a received multipath signal are estimated, the model comprising a value representative of the perpendicular distance between the plane of the reflecting surfaces (40, 50) and the radio station. This perpendicular distance may be measured from the round trip delay of a sounding signal transmitted by the radio station. The amount of computation is reduced by applying constraints to the parameters, and these constraints may comprise this perpendicular distance. The constraints may also be a function of parameters such as the path length, angle of arrival or amplitude of the direct path signal, and the amplitude of reflections of the sounding signal. The values of the parameters may be estimated initially by analysis of the received signals, followed by a parameter estimation process. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation. © KIPO & WIPO 2007 ...

FUNKSTATION MIT MEHRWEGESIGNALMODELLIERUNG

RADIO STATION AND RADIO SYSTEM WITH MODELING OF MULTIPATH PROPAGATION

A radio station (10) and radio system (1, 2) in which the value of parameters for a model of a received multipath signal transmitted by a remote station (20) are estimated. A sounding signal transmitted and received by the radio station is used to derive data about the reflecting environment and this data is incorporated into the model after scaling it to represent the multipath signal received from a remote station. Optionally or alternatively the remote station may transmit a sounding signal and derive data about its reflecting environment and transmit this data to the radio station, The model may incorporate both sets of derived data, particularly if they are uncorrelated. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation. © KIPO & WIPO 2007 ...

FUNKSSTATION UND FUNKSSYSTEM MIT MODELLIERUNG DER MEHRWEGAUSBREITUNG

MULTIPLE-INPUT MULTIPLE-OUTPUT COMMUNICATIOIN SYSTEM

Radio stations (10, 20) include a variety of propagation models. A radio signal is transmitted from a first to a second radio station, and the received signal is fitted to a plurality of models. Alternatively, the correlation of the received signals is fitted to models. The received signals are processed based on the best fit model, and the corresponding propagation effects. In some cases, the model can be used to correct for propagation effects. In other cases, other techniques such as beam steering can be used. © KIPO & WIPO 2007 ...

OBJEKTPOSITIONSBESTIMMUNG

FUNKSSTATION UND FUNKSSYSTEM MIT MODELLIERUNG DER MEHRWEGAUSBREITUNG

A radio system ( 10 ) and radio system ( 1, 2 ) in which the value of parameters for a model of a received multipath signal transmitted by a remote station ( 20 ) are estimated. A sounding signal transmitted and received by the radio station is used to derive data about the reflecting environment and this data is incorporated into the model after scaling it to represent the multipath signal received from a remote station. Optionally or alternatively the remote station may transmit a sounding signal and derive data about its reflecting environment and transmit this data to the radio station, The model may incorporate both sets of derived data, particularly if they are uncorrelated. The values of the resulting parameters are exploited in applications such as ranging, location or equalization.

Multiple-input multiple-output communication system

Radio stations ( 10, 20 ) include a variety of propagation models. A radio signal is transmitted from a first to a second radio station, and the received signal is fitted to a plurality of models. Alternatively, the correlation of the received signals is fitted to models. The received signals are processed based on the best fit model, and the corresponding propagation effects. In some cases, the model can be used to correct for propagation effects. In other cases, other techniques such as beam steering can be used.

Method of, and apparatus for, determining position

A method of, and apparatus for, determining position, comprises a receiver ( 14 ) receiving a signal from a remote transmitter ( 22 ) whose position has to be determined. The Fourier transform of a power spectrum density of the received signal is determined and a check is made to see if a line-of-sight (LOS) signal is present. If so, a multipath mitigation technique is implemented to identify the LOS signal and once identified the position of the remote transmitter is determined by deriving the propagation time of the LOS signal. Current can be saved by inhibiting the multipath mitigation technique in the absence of detecting a LOS signal. In one embodiment the presence or absence of the LOS signal is determined by dividing the magnitude of the peak at zero frequency by the maximum magnitude of all the other peaks and if the answer is less than unity, LOS is not present.

Mehrwegkompensation

POSITIONIERUNGSVERFAHREN UND -VORRICHTUNG

Radio station and radio system

FUNKSTATION MIT MEHRWEGESIGNALMODELLIERUNG

METHOD OF POSITION DETERMINATION

Unit 1 has antenna (10) receive incoming signal R(t) and it pass it to multiplier block (11) for multiplication with output C from the carrier generator (12) in order to mix down signal R(t) which is passed to a block of correlators (13) for sequential correlation replica code of the mixed down signal and the generator correlators (13) from code generator, in order to produce correlation data from the I (imaginary) and Q (real) channels using input signals from code generator (14). The correlation data is then passed to signal processing block (15) which adjusts appropriately both the code generator (13) and carrier generator (12) to provide accurate position measurement in indoor environments with multiple diffuse reflections. © KIPO & WIPO 2007 ...

Object location

A positioning method uses backscattered signals from a radio station (10, 20) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database (37) to identify objects in the vicinity of the radio station (10, 20).

OBJEKTPOSITIONSBESTIMMUNG

Positioning method and apparatus

In a GPS or GSM system using DSSS signals, accurate and robust time-of-flight signal processing is achieved by selection of leading-edge or correlation techniques based on a variety of tests and environmental conditions.

Method of, and apparatus for, determining position

Radio station and radio system

A radio system ( 10 ) and radio system ( 1, 2 ) in which the value of parameters for a model of a received multipath signal transmitted by a remote station ( 20 ) are estimated. A sounding signal transmitted and received by the radio station is used to derive data about the reflecting environment and this data is incorporated into the model after scaling it to represent the multipath signal received from a remote station. Optionally or alternatively the remote station may transmit a sounding signal and derive data about its reflecting environment and transmit this data to the radio station, The model may incorporate both sets of derived data, particularly if they are uncorrelated. The values of the resulting parameters are exploited in applications such as ranging, location or equalization.

Multipath mitigation

Object location

A positioning method uses backscattered signals from a radio station ( 10, 20 ) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database ( 37 ) to identify objects in the vicinity of the radio station ( 10, 20 ).

Method of, and apparatus for, operating a radio system

Multi-input multi-output system

Radio stations (10, 20) include a variety of propagation models. A radio signal is transmitted from a first to a second radio station, and the received signal is fitted to a plurality of models. Alternatively, the correlation of the received signals is fitted to models. The received signals are processed based on the best fit model, and the corresponding propagation effects. In some cases, the model can be used to correct for propagation effects. In other cases, other techniques such as beam steering can be used.

Object location

Radio station with multipath signal modeling

Method of position determination

A device includes an antenna for receiving an incoming signal. A multiplier multiplies the incoming signal with an output from a carrier generator in order to mix down signal the incoming signal. The output of the multiplier is provided to correlators for sequential correlation with a replica code of the mixed down signal provided from a code generator, in order to produce correlation data including I (imaginary) and Q (real) channels. The correlation data is then passed to a signal processor which adjusts appropriately both the code generator and the carrier generator to provide accurate position measurement in indoor environments with multiple diffuse reflections.

Radio station and radio system with modeling of multipath propagation

Radio station and radio system with modeling of multipath propagation

A radio station (10) and radio system (1, 2) in which the value of parameters for a model of a received multipath signal transmitted by a remote station (20) are estimated. A sounding signal transmitted and received by the radio station is used to derive data about the reflecting environment and this data is incorporated into the model after scaling it to represent the multipath signal received from a remote station. Optionally or alternatively the remote station may transmit a sounding signal and derive data about its reflecting environment and transmit this data to the radio station, The model may incorporate both sets of derived data, particularly if they are uncorrelated. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation.

Positioning method and apparatus

In a GPS or GSM system using DSSS signals, accurate and robust time-of-flight signal processing is achieved by selection of leading-edge or correlation techniques based on a variety of tests and environmental conditions.

Positioning method and apparatus

In a GPS or GSM system using DSSS signals, accurate and robust time-of-flight signal processing is achieved by selection of leading-edge or correlation techniques based on a variety of tests and environmental conditions.

Object location

A positioning method uses backscattered signals from a radio station ( 10, 20 ) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database ( 37 ) to identify objects in the vicinity of the radio station ( 10, 20 ).

Method of, and apparatus for, determining position

A method of, and apparatus for, determining position, comprises a receiver (14) receiving a signal from a remote transmitter (22) whose position has to be determined. The Fourier transform of a power spectrum density of the received signal is determined and a check is made to see if a line-of-sight (LOS) signal is present. If so, a multipath mitigation technique is implemented to identify the LOS signal and once identified the position of the remote transmitter is determined by deriving the propagation time of the LOS signal. Current can be saved by inhibiting the multipath mitigation technique in the absence of detecting a LOS signal. In one embodiment the presence or absence of the LOS signal is determined by dividing the magnitude of the peak at zero frequency by the maximum magnitude of all the other peaks and if the answer is less than unity, LOS is not present.

Positionierungsverfahren und -vorrichtung

Mehrwegkompensation

Objektpositionsbestimmung

Funksstation und funkssystem mit modellierung der mehrwegausbreitung

Positioning system and method

Radio station with multipath signal modeling

A radio station ( 10 ) in which the value of parameters for a model of a received multipath signal are estimated, the model comprising a value representative of the perpendicular distance between the plane of the reflecting surfaces ( 40, 50 ) and the radio station. This perpendicular distance may be measured from the round trip delay of a sounding signal transmitted by the radio station. The amount of computation is reduced by applying constraints to the parameters, and these constraints may comprise this perpendicular distance. The constraints may also be a function of parameters such as the path length, angle of arrival or amplitude of the direct path signal, and the amplitude of reflections of the sounding signal. The values of the parameters may be estimated initially by analysis of the received signals, followed by a parameter estimation process. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation.

Funkstation mit mehrwegesignalmodellierung

Radio station with multipath signal modeling

A radio station (10) in which the value of parameters for a model of a received multipath signal are estimated, the model comprising a value representative of the perpendicular distance between the plane of the reflecting surfaces (40, 50) and the radio station. This perpendicular distance may be measured from the round trip delay of a sounding signal transmitted by the radio station. The amount of computation is reduced by applying constraints to the parameters, and these constraints may comprise this perpendicular distance. The constraints may also be a function of parameters such as the path length, angle of arrival or amplitude of the direct path signal, and the amplitude of reflections of the sounding signal. The values of the parameters may be estimated initially by analysis of the received signals, followed by a parameter estimation process. The values of the resulting parameters are exploited in applications such as ranging, location or equalisation.

Object location

A positioning method uses backscattered signals from a radio station ( 10, 20 ) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database ( 37 ) to identify objects in the vicinity of the radio station ( 10, 20 ).

Object location

A positioning method uses backscattered signals from a radio station ( 10, 20 ) to locate the radio station within an area, for example in a room in a building. The difference between the measured backscattered signals and the expected signals is then found, and the difference is compared with data stored in an object database ( 37 ) to identify objects in the vicinity of the radio station ( 10, 20 ).