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    Method and arrangement for estimation of line properties
    72.
    发明专利
    Method and arrangement for estimation of line properties 未知

    公开(公告)号：AU2004236618B2

    公开(公告)日：2009-02-19

    申请号：AU2004236618

    申请日：2004-05-11

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LINDQVIST FREDRIK ,  JENSEN AXEL FRANK ,  WIA ADAM

    IPC: G01R27/28 ,  G01V1/00 ,  H04B3/46 ,  H04M3/30

    Abstract: The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.

    73.
    发明专利
    未知

    公开(公告)号：BRPI0410286A

    公开(公告)日：2006-05-16

    申请号：BRPI0410286

    申请日：2004-03-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： RJESSON PER OLA B ,  FERTNER ANTONI ,  JENSEN AXEL FRANK ,  LINDQVIST FREDRIK ,  ROSENBERG JONAS ,  WIA ADAM ,  IDLING PER

    IPC: G01R27/28 ,  G01V1/00 ,  H04M3/30 ,  H04B3/46

    Abstract: The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.

    74.
    发明专利
    未知

    公开(公告)号：BRPI0410263A

    公开(公告)日：2006-05-16

    申请号：BRPI0410263

    申请日：2004-05-11

    Applicant: ERICSSON TELEFON AB L M

    Inventor： JENSEN AXEL FRANK ,  LINDQVIST FREDRIK ,  WIA ADAM

    IPC: G01R27/28 ,  G01V1/00 ,  H04M3/30 ,  G01B7/02 ,  G01R31/08 ,  H04B3/46 ,  H04M3/22

    Abstract: The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.

    Method and arrangement for signal loop test
    75.
    发明专利
    Method and arrangement for signal loop test 未知

    公开(公告)号：AU2004237642A1

    公开(公告)日：2004-11-18

    申请号：AU2004237642

    申请日：2004-03-04

    Applicant: ERICSSON TELEFON AB L M

    Inventor： FERTNER ANTONY ,  ROSENBERG JONAS ,  WIA ADAM ,  BORJESSON PER OLA ,  JENSEN AXEL FRANK ,  LINDQVIST FREDRIK ,  ODLIN PER

    IPC: G01R27/28 ,  G01V1/00 ,  H04M3/30 ,  H04B3/46

    Abstract: The length and attenuation of a signal line between a transmitter and a customer premises equipment is to be estimated. A frequency dependent line input impedance (Z in (f)) as seen from the transmitter, is measured and an absolute impedance value (oe Z in (f) oe), is generated. The latter is shown as a curve (A1) in the diagram with the frequency (f) on the abscissa and the impedance (oe Z in (f) oe) on the ordinate. Extreme values (Max. 1 , Max 2 , Max 3 ; Min 1 , Min 2 , Min 3 ) arc denoted and a frequency distance (FD 1 -FD 4 ) between two consecutive of the extreme values is generated. The line length (L) is generated as L=½.vop/FD 1 , in which vop is the velocity of propagation of a signal on the line. The attenuation is estimated by multiplying the line length with an average attenuation value for the actual line type. The advantages are that the line length can be estimated with good accuracy in a simple manner for short lines and that the line attenuation is estimated in a simple manner.

    76.
    发明专利
    未知

    公开(公告)号：SE521665C2

    公开(公告)日：2003-11-25

    申请号：SE0002715

    申请日：2000-07-19

    Applicant: ERICSSON TELEFON AB L M

    Inventor： LINDQVIST FREDRIK ,  FERTNER ANTONI ,  FRENGER PAAL

    IPC: H04B3/23 ,  H04B3/20

    Abstract: An echo canceller reduces an echo signal produced when the transmitted signal leaks back into the receiver via a hybrid. The echo canceller estimates the echo signal from the transmitted signal, and then subtracting the estimated echo signal from the received signal. In practice, the echo path channel in a DMT-modem is much longer than the cyclic prefix, and therefore, the received echo signal will be subjected to both ISI (inter-symbol-interference) and ICI (inter-carrier-interference). A traditional echo canceller, designed for a xDSL-modem, uses either a time domain adaptive FIR-filter or a combined echo canceller implemented in both time and frequency domain. A matrix-based adaptive echo canceller is implemented in the frequency domain. Various example embodiments are disclosed.

    Diseño SRS para portadoras sin licencia
    79.
    发明专利
    Diseño SRS para portadoras sin licencia 未知

    公开(公告)号：ES2835050T3

    公开(公告)日：2021-06-21

    申请号：ES17705970

    申请日：2017-02-06

    Applicant: ERICSSON TELEFON AB L M

    Inventor： WANG MENG ,  MUKHERJEE AMITAV ,  LINDQVIST FREDRIK ,  CHENG JUNG-FU ,  SAHLIN HENRIK

    IPC: H04L5/00 ,  H04L25/02

    Abstract: Un terminal (10) para una red de comunicación inalámbrica de Evolución a Largo Plazo, LTE, en un espectro sin licencia, estando el terminal (10) adaptado para realizar un procedimiento de Escuchar Antes de Hablar, LBT, para uno o más anchos de banda de transmisión de dicho espectro sin licencia; estando el terminal además adaptado para: transmitir la señalización del Canal Compartido de Enlace Ascendente Físico, PUSCH, en una subtrama PUSCH en uno o más entrelazados dentro de uno o más anchos de banda de transmisión, en donde el terminal se adapta además para transmitir la Señalización de Referencia de Sondeo en el uno o más entrelazados en la subtrama PUSCH, estando el terminal caracterizado por que la transmisión de la Señalización de Referencia de Sondeo comprende la multiplexación de la Señalización de Referencia de Sondeo transmitida en los diferentes puertos de antena en base a desplazamientos cíclicos.

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