Digital receive filter for communications systems

Details Digital receive filter for communications systems Digital receive filter for communications systems

1996-05-30

1998-05-26

Gordon, Paul P.

Boots, shoes, and leggings

3647241, G06F 1710, G06F 1717

Patent

active

057576831

ABSTRACT:
A digital receive filter comprises first and second filter parts with a down sampler between them. Each filter part is formed by a plurality of cascaded filter stages each comprising a second order finite impulse response digital filter having symmetrical coefficients which in most cases are integer powers of two, and in other cases are zero or a sum of integer powers of two. The filter stages are implemented by delay units and add units with shifting of bits at the inputs of the add units to implement the coefficients, whereby multipliers are avoided. A described receive filter has two filter stages in the first part, a down sampling factor of two, and seven filter stages in the second part, with scaling factors and ordering of the filter stages to facilitate filtering and minimize noise.

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Jackson, et al; An Approach to the Implementation of Digital Filters; IEEE Transactions on Audio and Electroacoustics, vol. AU 16, No. 3; pp. 413-421, Sep. 1968.
"An Improved Search Algorithm for the Design of Multiplierless FIR Filters with Powers-of-Two Coefficients", H. Samueli, IEEE Transactions on Circuits and Systems, vol. 36, No. 7, pp. 1044-1047, Jul. 1989.

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