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    EFFICIENT MULTICHANNEL FILTERING FOR CDMA
    21.
    发明专利
    EFFICIENT MULTICHANNEL FILTERING FOR CDMA 未知

    公开(公告)号：CA2434522A1

    公开(公告)日：1997-12-31

    申请号：CA2434522

    申请日：1997-06-24

    Applicant: INTERDIGITAL TECH CORP

    Inventor： REGIS ROBERT T

    IPC: G06F17/10 ,  H03H17/02 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/7093 ,  H04B7/216

    Abstract: An efficient, multichannel filter for CDMA modems permits multiple serial, digital bit streams to be filtered by digital signal processing techniques including sample weighting and summing functions. Each individual channel may have custom weighting coefficients or weighting coefficients common for all channels. If the weighting coefficients are by adoption, the same approach may be taken. The multichannel FIR filter is implemented with no multipliers and a reduction. in the number of adders. To increase the speed of operation, the filter structure utilizes look-up tables storing the weighting coefficients. The invention can be embodied either as a field programmable gate array or an application specific integrated circuit, The use of look-up tables saves significant chip resources.

    EFFICIENT MULTICHANNEL FILTERING FOR CDMA MODEMS
    22.
    发明专利
    EFFICIENT MULTICHANNEL FILTERING FOR CDMA MODEMS 未知

    公开(公告)号：CA2259261A1

    公开(公告)日：1997-12-31

    申请号：CA2259261

    申请日：1997-06-24

    Applicant: INTERDIGITAL TECH CORP

    Inventor： REGIS ROBERT T

    IPC: G06F17/10 ,  H03H17/02 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/7093 ,  H04B7/216

    Abstract: An efficient, multichannel filter for CDMA modems permits multiple serial, digital bit streams to be filtered by digital signal processing techniques including sample weighting and summing functions. Each individual channel may have custom weighting coefficients or weighting coefficients common for all channels. If the weighting coefficients are by adaption, the same approach may be taken. The multichannel FIR filter is implemented with no multipliers and a reduction in the number of adders. To increase the speed of operation, the filter structure utilizes look-up tables storing the weighting coefficients. The invention can be embodied either as a field programmable gate array or an application specific integrated circuit. The use of look-up tables saves significant chip resources.

    25.
    发明专利
    未知

    公开(公告)号：DE69736444T2

    公开(公告)日：2007-08-02

    申请号：DE69736444

    申请日：1997-06-24

    Applicant: INTERDIGITAL TECH CORP

    Inventor： REGIS ROBERT T

    IPC: H03H17/02 ,  G06F17/10 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/7093 ,  H04B7/216 ,  H04B7/26

    Abstract: The present invention provides a multichannel digital filter for filtering a plurality of signals transmitted via a plurality of channels in a code division multiple access (CDMA) communication system, the multichannel digital filter comprising: a plurality of filter inputs, one for each of the plurality of channels; a filter output for generating a single filter output for the plurality of filter inputs from the plurality of channels; a plurality of look-up tables (LUTs), each LUT comprising a plurality of memory addresses, for storing respective ones of precomputed weighted sums for all possible combinations of the plurality of filter inputs, whereby each LUT outputs a weighted sum of the plurality of filter inputs in accordance with the filter inputs from the plurality of channels; and a plurality of registers and a plurality of adders alternately arranged in series, whereby each adder adds outputs of the LUT and the value stored in each register in each operation cycle and each register buffers the output of each adder temporarily until the next operation cycle.

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