Fir filters with multiplexed inputs suitable for use in reconfig

Details Fir filters with multiplexed inputs suitable for use in reconfig Fir filters with multiplexed inputs suitable for use in reconfig

1995-03-01

1997-06-24

Chin, Wellington

Pulse or digital communications

Equalizers

Automatic

375233, 375321, 3647242, 348725, H03H 730

Patent

active

056423829

ABSTRACT:
Methods and apparatus for providing implementation efficient adaptive equalizers suitable for use with QAM and/or VSB signals are disclosed. Finite impulse response ("FIR") filters are used to implement the disclosed adaptive equalizers. A plurality of arithmetic operator sharing techniques are disclosed for reducing the number of arithmetic operators required to implement the adaptive equalizers. In addition, methods of reconfiguring the arithmetic operators used to implement a QAM equalizer so that they can be used to implement a VSB equalizer circuit are disclosed. Methods of the present invention use multiplexers to reconfigure the FIR filters from a complex decimating FIR filter for use during QAM operation, to a half complex feedforward FIR filter and a real decision feedback FIR filter suitable for use during VSB mode operation of the equalizer circuit of the present invention. Using the methods of the present invention it is possible to implement a 256-tap FIR filter using only 64 sets of arithmetic operators. The adaptive equalizer of the present invention may be used in a demodulator for demodulating QAM and/or VSB signals.

REFERENCES:
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patent: 5363408 (1994-11-01), Paik et al.
patent: 5367476 (1994-11-01), Elliott
patent: 5381357 (1995-01-01), Wedgwood
patent: 5398073 (1995-03-01), Wei
patent: 5483529 (1996-01-01), Baggen et al.
patent: 5493343 (1996-02-01), Knutson et al.
patent: 5506636 (1996-04-01), Patel et al.
patent: 5550596 (1996-08-01), Strolle et al.

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