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    METHODS AND APPARATUS FOR EFFICIENT LOW-IF RECEIVERS
    95.
    发明申请
    METHODS AND APPARATUS FOR EFFICIENT LOW-IF RECEIVERS 审中-公开

    公开(公告)号：US20180183636A1

    公开(公告)日：2018-06-28

    申请号：US15391675

    申请日：2016-12-27

    申请人： Texas Instruments Incorporated

    发明人： Raghu Ganesan ,  Yogesh Darwhekar ,  Subhashish Mukherjee

    IPC分类号： H04L27/06 ,  H04L12/26

    CPC分类号： H04L27/06 ,  H04L43/08 ,  H04L43/16

    摘要： Described examples include a method for operating a receiver including receiving an output of an in-phase IF path; receiving an output of a quadrature IF path; measuring a blocker power on a plurality of IF channels on at least one of the in-phase path and the quadrature path within a fraction of a symbol interval; selecting a selected one of the plurality of IF channels having a low blocker power as an image channel; and providing a local oscillator output to the in-phase IF path and quadrature IF path operate corresponding to the image channel, such that a frequency of the local oscillator output is changed within a fraction of the symbol interval.

    Position error signal burst demodulation
    98.
    发明授权
    Position error signal burst demodulation 有权

    公开(公告)号：US09979573B1

    公开(公告)日：2018-05-22

    申请号：US15390447

    申请日：2016-12-23

    申请人： Seagate Technology LLC

    发明人： Marcus Marrow ,  Jason Vincent Bellorado ,  Trung Thuc Nguyen

    IPC分类号： G11B21/02 ,  H04L27/06 ,  H04L1/00 ,  H04L27/22

    CPC分类号： H04L27/06 ,  H04L27/22

    摘要： A method may generate a demodulated sine component for a sequence of samples of a servo burst window of a position error signal using a sine weight look up table and generate a demodulated cosine component for the sequence of samples of the servo burst window of the position error signal using a cosine weight look up table. The sine weight and the cosine weight look up tables may have indexes representing a phase range. The method may generate a demodulated phase component signal and a demodulated amplitude component signal for the sequence of samples of the servo burst window of the position error signal based on the demodulated sine component and the demodulated cosine component using a Coordinate Rotation Digital Computer at least in part by iteratively rotating a vector based on the demodulated sine component and the demodulated cosine component and summing angular changes in the vector.

    Filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals
    99.
    发明授权
    Filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals 有权

    公开(公告)号：US09941862B2

    公开(公告)日：2018-04-10

    申请号：US15127472

    申请日：2015-03-20

    申请人： DYNASPOT CORP.

    发明人： Marvin L. Sassler ,  Alan T. Sassler

    IPC分类号： H04L27/06 ,  H03H17/02 ,  H04B1/16

    CPC分类号： H03H17/0248 ,  H03D3/06 ,  H03D3/26 ,  H03H17/0264 ,  H03H2240/00 ,  H04B1/16

    摘要： The trans-filter compresses in band AWGN, demodulates input signals and has no threshold due to applied noise. Two frequency selective networks with opposite amplitude vs frequency slopes are designed to remain 180 degrees out of phase over the signal band. Output amplitudes are equal at band center and are summed producing a monotonic amplitude vs frequency characteristic going thru zero at center frequency with abrupt phase reversal. This produces the parabolic output noise density and differentiates applied signals. Absence of nonlinear circuit components and product devices prevents generation of noise×noise products, avoiding the threshold phenomenon. Exponentially modulated digital signals produce output impulses due to the slope and abrupt phase reversal. The impulses have strong fundamental frequency components and may be recovered at baseband without frequency conversion. Cascading trans-filters increases noise reduction and impulse amplitude. The trans-filter algorithm may be used separately or in conjunction with one or more hardware trans-filters.