Equalizer for complex modulations in very noisy environments

Details Equalizer for complex modulations in very noisy environments Equalizer for complex modulations in very noisy environments

2006-08-08

2006-08-08

Patel, Jay K. (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S340000, C375S229000, C714S794000, C714S795000

Reexamination Certificate

active

07088793

ABSTRACT:
An equalizer is used with complex modulation modems to reduce intersymbol interference. The equalizer includes an equalizer filter that receives an input data signal and adapts to compensate for the noisy communications channels to reduce intersymbol interference to the input signal. A branch metric computer demodulates the equalizer filter adapted input data signal. A decision device delivers an alpha value, starting phase information and confidence values from the demodulated input data signal. A gain determination function receives the confidence values and determines adaptation gain for the equalizer filter. A remodulator receives the alpha value and starting phase information and remodulates the alpha value and starting phase information into a remodulated data signal. A summing function compares the remodulated data signal to a delayed version of the input signal to generate an error signal for the equalizer filter to adjust the equalizer filter.

REFERENCES:
patent: 6023783 (2000-02-01), Divsalar et al.
patent: 6088387 (2000-07-01), Gelblum et al.
patent: 6275525 (2001-08-01), Bahai et al.
patent: 6563877 (2003-05-01), Abbaszadeh
patent: 2002/0048331 (2002-04-01), Tran et al.
patent: 2002/0097814 (2002-07-01), Eidson et al.
patent: 2002/0186762 (2002-12-01), Xia et al.
“Synchronization Method And Apparatus For Modems Based On Jointly Iterative Turbo Demodulation And Decoding” by S. White, J. Whited, T. Tapp and R. Mickelson, U.S. Appl. No. 09/961,666, filed Sep. 24, 2001.

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