公开(公告)号：AT543264T

公开(公告)日：2012-02-15

申请号：AT05855319

申请日：2005-12-22

Applicant: QUALCOMM INC

Inventor： TOMASIN STEFANO ,  PFISTER HENRY ,  HOU JILEI ,  SMEE JOHN

IPC: H04B1/707 ,  H04B7/005

Abstract: A method and system for interference cancellation (IC). One aspect relates to traffic interference cancellation. Another aspect relates to joint IC for pilot, overhead and data. Another aspect relates to improved channel estimation. Another aspect relates to adaptation of transmit subchannel gains.

公开(公告)号：AT472195T

公开(公告)日：2010-07-15

申请号：AT02806583

申请日：2002-05-17

Applicant: QUALCOMM INC

Inventor： SMEE JOHN ,  SINDHUSHAYANA NAGABHUSHANA

IPC: H04B1/7105 ,  H04B7/02 ,  H04B7/08

Abstract: Method and apparatus to compute the combiner coefficients for wireless communication systems for a space-time solution. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. A Minimizing Mean Square Error, MMSE, approach is applied allowing weight combining on a per path basis. The weights are calculated as a function of a noise correlation matrix and spatial signature per path. The noise correlation matrix is determined from an autocorrelation matrix of the received signal. In one embodiment, the MMSE approach is applied to a non-time gated pilot signal.

公开(公告)号：AU2002363722B2

公开(公告)日：2008-02-21

申请号：AU2002363722

申请日：2002-11-08

Applicant: QUALCOMM INC

Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN ,  JAYARAMAN SRIKANT

IPC: H03D7/00 ,  H03D1/00 ,  H03J7/04 ,  H04B1/26 ,  H04B1/707 ,  H04L27/00

Abstract: A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a received signal. An analog frequency reference having a wide frequency range and coarse frequency resolution is used in conjunction with a digital frequency reference having a narrow frequency range and fine frequency resolution. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjust the frequencies of the carrier signals generated by the multiple frequency generation sources.

公开(公告)号：MX2007007766A

公开(公告)日：2007-08-21

申请号：MX2007007766

申请日：2005-12-22

Applicant: QUALCOMM INC

Inventor： SMEE JOHN ,  HOU JILEI ,  TOMASIN STEFANO ,  PFISTER HENRY

IPC: H04B1/00

Abstract: Un metodo y sistema para cancelacion de interferencia (IC). Un aspecto se refiere a cancelacion de interferencia de trafico. Otro aspecto se refiere a IC conjunta para piloto, sobrecarga y datos. Otro aspecto se refiere a estimacion de canal mejorada. Otro aspecto se refiere a adaptacion de ganancias de subcanal de transmision.

公开(公告)号：AU2003213180A1

公开(公告)日：2003-09-09

申请号：AU2003213180

申请日：2003-02-19

Applicant: QUALCOMM INC

Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  JAYARAMAN SRIKANT ,  SMEE JOHN

IPC: H03H21/00

公开(公告)号：CA2466351A1

公开(公告)日：2003-05-22

申请号：CA2466351

申请日：2002-11-08

Applicant: QUALCOMM INC

Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  SMEE JOHN ,  JAYARAMAN SRIKANT

IPC: H03D7/00 ,  H03D1/00 ,  H03J7/04 ,  H04B1/26 ,  H04B1/707 ,  H04L27/00 ,  H03D7/16

Abstract: A carrier recovery method and apparatus using multiple stages of carrier frequency recovery are disclosed. A receiver uses multiple frequency generation sources to generate carrier signals used to downconvert a receive d signal. An analog frequency reference (114) having a wide frequency range an d coarse frequency resolution is used in conjunction with a digital frequency reference (110) having a narrow frequency range and fine frequency resolutio n. The multiple carrier signals are multiplied by a received signal to effect a multi-stage downconversion, resulting in a baseband signal. A frequency tracking module (108) measures the residual frequency error present in the baseband signal. The measured residual frequency error is then used to adjus t the frequencies of the carrier signals generated by the multiple frequency generation sources (114 and 110). through a processor.