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    22.
    发明专利
    未知

    公开(公告)号：DK1792462T3

    公开(公告)日：2008-11-03

    申请号：DK05797433

    申请日：2005-09-16

    Applicant: QUALCOMM INC

    Inventor： JAYARAMAN SRIKANT ,  NAMGOONG JUNE ,  XU HAO ,  BLACK PETER J

    IPC: H04L27/26 ,  H04B1/10 ,  H04L1/20

    Abstract: The present patent application comprises a method and means for demodulating symbols, comprising converting an OFDM symbol from a time domain to a frequency domain, selecting pilot tones, making a soft decision based on received data, and estimating a channel frequency response. In another example, the method and means further comprises selecting guard tones. In another example, the method and means further comprises generating channel estimates for in-band and band-edge pilot tones.

    24.
    发明专利
    未知

    公开(公告)号：AT400150T

    公开(公告)日：2008-07-15

    申请号：AT04812862

    申请日：2004-12-03

    Applicant: QUALCOMM INC

    Inventor： FERNANDEZ-CORBATON IVAN JESUS ,  JAYARAMAN SRIKANT ,  SWEET CHARLES WHEELER

    IPC: H04W72/08

    Abstract: Systems and methods for adaptively allocating resources between a dedicated reference signal and a traffic signal are disclosed. In an exemplary embodiment, a wireless communication system 100 includes a base station 404. The base station 404 includes a receiver 428 that receives a quality metric 432 from a remote station 106. The quality metric 432 indicates the quality of a signal transmitted from the base station 404 and received by the remote station 106. The base station 404 also includes a resource allocation component 434 that uses the quality metric 432 to allocate a resource between the traffic signal 422 and the dedicated reference signal 418. The base station 404 also includes a transmitter 426 that transmits the traffic signal 422 and the dedicated reference signal 418 to the remote station 106.

    26.
    发明专利
    未知

    公开(公告)号：BR0213986A

    公开(公告)日：2005-04-19

    申请号：BR0213986

    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 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.

    27.
    发明专利
    未知

    公开(公告)号：NO20042344L

    公开(公告)日：2004-07-28

    申请号：NO20042344

    申请日：2004-06-07

    Applicant: QUALCOMM INC

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

    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 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.

    METHOD AND APPARATUS FOR HYBRID DECISION FEEDBACK EQUALIZATION
    30.
    发明专利
    METHOD AND APPARATUS FOR HYBRID DECISION FEEDBACK EQUALIZATION 未知

    公开(公告)号：CA2493106A1

    公开(公告)日：2004-01-29

    申请号：CA2493106

    申请日：2003-07-18

    Applicant: QUALCOMM INC

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

    IPC: H04L27/01 ,  H04B7/005 ,  H04L25/00 ,  H04L25/03

    Abstract: A method and apparatus for a decision feedback equalizer wherein a correctio n term is used to compensate for slicer errors, thus avoiding error propagatio n. Filter coefficients for the equalizer are selected so as to minimize a cost function for the equalizer, including a correction term as a function of the energy of the filter coefficients. The equalizer includes a coefficient generator responsive to the correction term. One embodiment estimates a transmitted symbol from a received sample as a function of Signal-to- Interference and Noise Ratio (SINR) of the received sample. The received sample is quantized and mapped to a region of a grid overlaid on the transmitted symbol constellation. The region may correspond to a symbol estimate value or may be processed further to obtain a symbol estimate value .

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