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公开(公告)号：AT235762T
公开(公告)日：2003-04-15
申请号：AT99971979
申请日：1999-11-03
Applicant: ERICSSON TELEFON AB L M
Inventor： ATARIUS ROOZBEH , ERIKSSON HAKAN , PALENIUS TORGNY , CARLSSON TORSTEN , OESTBERG CHRISTER , GUSTAFSSON KJELL
IPC: H04B1/7115 , H04B7/26 , H04B1/707 , H04B17/00
Abstract: The present invention provides a system and method for reducing the power consumed by a RAKE receiver. In exemplary embodiments of the present invention, an environment variation estimator is implemented in a CDMA mobile station. The environment variation estimator is connected to the searcher of the RAKE receiver and provides an estimate of the rate at which the mobile station's environment is changing. By providing an estimate of the rate of change of the mobile station's environment, the duty cycle of the searcher can be optimized, thereby reducing the overall power consumed by the receiver. By also providing the estimate to the RAKE fingers, channel tracking can be improved.
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公开(公告)号：BR9807287A
公开(公告)日：2000-03-21
申请号：BR9807287
申请日：1998-01-13
Applicant: ERICSSON TELEFON AB L M
Inventor： ISBERG MARTIN , LINDGUIST BJORN , CARLSSON TORSTEN , HAGBERG HANS , JAKOBSSON PETER , KUNKEL LARS PETER , GUSTAFSSON KJELL
Abstract: The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.
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公开(公告)号：HK1019126A1
公开(公告)日：2000-01-21
申请号：HK99104111
申请日：1999-09-22
Applicant: ERICSSON TELEFON AB L M
Inventor： GUSTAFSSON KJELL , ATARIUS ROOZBEH
Abstract: A circuit is disclosed for sampling analog signals at a rate which is a rational, non-integer fraction of a clock frequency. The analog signal is sampled at non-equidistant sampling points, with the distances between successive points forming a jitter sequence. The jitter sequence is pre-calculated and stored in a memory within the circuit, reducing processing requirements in use.
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公开(公告)号：AU1670899A
公开(公告)日：1999-06-15
申请号：AU1670899
申请日：1998-11-17
Applicant: ERICSSON TELEFON AB L M
Inventor： GUSTAFSSON KJELL , ATARIUS ROOZBEH
Abstract: A circuit is disclosed for sampling analog signals at a rate which is a rational, non-integer fraction of a clock frequency. The analog signal is sampled at non-equidistant sampling points, with the distances between successive points forming a jitter sequence. The jitter sequence is pre-calculated and stored in a memory within the circuit, reducing processing requirements in use.
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公开(公告)号：GB2331645A
公开(公告)日：1999-05-26
申请号：GB9724696
申请日：1997-11-21
Applicant: ERICSSON TELEFON AB L M
Inventor： GUSTAFSSON KJELL , ATARIUS ROOZBEH
Abstract: Analog signals are sampled at a rate which is a rational, non-integer fraction of a clock frequency. The analog signal 4 is sampled 2 at non-equidistant sampling points, with the distances between successive points forming a jitter sequence. The jitter sequence is pre-calculated and stored in a memory 12, reducing processing requirements in use.
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Patent Agency Ranking
公开(公告)号：AU5785598A
公开(公告)日：1998-08-07
申请号：AU5785598
申请日：1998-01-13
Applicant: ERICSSON TELEFON AB L M
Inventor： MANNERSTRALE JACOB , ISBERG MARTIN , LINDQUIST BJORN , CARLSSON TORSTEN , HAGBERG HANS , JAKOBSSON PETER , KUNKEL LARS PETER , GUSTAFSSON KJELL
Abstract: The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.
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公开(公告)号：MX9704753A
公开(公告)日：1997-10-31
申请号：MX9704753
申请日：1995-12-19
Applicant: ERICSSON TELEFON AB L M
Inventor： LINDQUIST BJORN , ISBERG MARTIN , WENDELRUP HEINO , SALLENHAG MARTIN , GUSTAFSSON KJELL
IPC: H04L27/38 , H03D3/00 , H04B1/10 , H04B1/22 , H04B1/26 , H04B1/30 , H04L27/14 , H04L27/227 , H04L27/233 , H04B01/10 , H03D03/00
Abstract: Un receptor de conversion directa compensado digitalmente incluye dispositivos para generar muestras digitales de una señal en fase de banda base y una señal de cuadratura de banda de base y para detectar la presencia de una señal de productos de segundo orden producida mediante una señal de interferencia modulada en amplitud. Asimismo, el aparato comprende un dispositivo para compensar digitalmente las muestras digitales removiendo la señal de producto de segundo orden, produciendo de esta manera muestras digitales compensadas. En un método para compensar digitalmente muestras de una señal de informacion que modula en cuadratura una señal portadora, las muestras calculadas de un producto de segundo orden desde una señal portadora conmutada se forman promediando las muestras digitales durante dos períodos de tiempo y determinando un tiempo de rampa en las señales en fase y de cuadratura que ocurre entre los períodos de tiempo debido a la señal de interferencia. Las muestras digitales pueden diferenciarse y los resultados rectificarse para determinar el tiempo de las rampas. En otro aparato, las muestras calculadas de la señal de producto de segundo se producen mediante un dispositivo para promediar un cuadrado de una diferencia entre las muestras digitales respectivas de la señal en fase y la señal de cuadratura, determinando de esta manera una amplitud de la señal portadora modulada en amplitud y un dispositivo para combinar la amplitud y las muestras digitales, generando de esta manera las muestras calculadas.
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公开(公告)号：DE60133657T2
公开(公告)日：2009-05-20
申请号：DE60133657
申请日：2001-09-25
Applicant: ERICSSON TELEFON AB L M
Inventor： CARLSSON TORSTEN , GUSTAFSSON KJELL , ATARIUS ROOZBEH , ERIKSSON HAKAN , OESTBERG CHRISTER , PALENIUS TORGNY
IPC: H04B1/7075 , H04B1/712
Abstract: A method and system enables matched filters of a CDMA system to be simplified using a two stage search. A course stage and a fine stage jointly produce the location(s) of received signal path-rays. In a first stage, an oversampled digital signal is decimated, and the decimated signal is applied to a matched filter to eventually produce an approximate location. In a second stage, the oversampled signal is shifted based on the determined approximate location and then correlated to a generated code, and a more-exact location is selected from the outputs of the correlations. Alternatively, a shifted version of the generated code is correlated to the oversampled signal, and the more-exact location is selected from the outputs of those correlations.
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公开(公告)号：ES2302757T3
公开(公告)日：2008-08-01
申请号：ES01986378
申请日：2001-09-25
Applicant: ERICSSON TELEFON AB L M
Inventor： CARLSSON TORSTEN , GUSTAFSSON KJELL , ATARIUS ROOZBEH , ERIKSSON HAKAN , OSTBERG CHRISTER , PALENIUS TORGNY
IPC: H04B1/7075 , H04B1/712
Abstract: Un método para localizar el emplazamiento de los rayos de trayectoria de señal en un sistema de comunicaciones, que comprende las etapas de: recibir (605) una señal; diezmar (615) dicha señal para producir una señal diezmada; procesar (625) dicha señal diezmada para obtener al menos un primer emplazamiento; y procesar (630) dicha señal y un código generado usando dicho al menos un primer emplazamiento para obtener al menos un segundo emplazamiento, caracterizado porque dicha etapa de procesar dicha señal y un código generado usando al menos un primer emplazamiento para obtener al menos un segundo emplazamiento comprende las etapas de desplazar (635, 640) uno de dicha señal y dicho código generado en respuesta a dicho al menos un primer emplazamiento para crear una variable desplazada y una variable no desplazada; correlacionar (645, 650) dicha variable desplazada con dicha variable no desplazada para obtener una pluralidad de valores de correlación; y comparar (655, 660) dicha pluralidad de valores de correlación para seleccionar el valor de correlación de entre los valores de correlación que resulte el mayor como dicho al menos un segundo emplazamiento.
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公开(公告)号：DE69833184D1
公开(公告)日：2006-04-06
申请号：DE69833184
申请日：1998-01-13
Applicant: ERICSSON TELEFON AB L M
Inventor： MANNERSTRLE JACOB , ISBERG MARTIN , LINDQUIST BJOERN , CARLSSON TORSTEN , HAGBERG HANS , JAKOBSSON PETER , KUENKEL PETER , GUSTAFSSON KJELL
Abstract: The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occurring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occurring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.
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