06671334 is referenced by 58 patents.

A measurement receiver demodulator has a first processing channel for producing a filtered signal sample output where the signal samples are processed through a transmission system receiver filter and a second processing channel producing an unfiltered signal sample output where the signal samples are not processed through the transmission system receiver filter. The first processing channel down converts digitally modulated IF signal samples and filters the down converted signal samples using a combined transmission system receiver filter and front end hardware compensation filter. A synchronizer produces timing phase and rate offset parameters that are applied to a resampling filter to synchronize the filtered signal samples to symbol instances of the symbol modulation. The filtered, time-aligned signal samples are scaled using a derived scaling factor. A pilot offset level, if present, is estimated and removed. The resultant signal samples are processed through an equalizer to produce filtered, time-aligned, scaled equalized signal samples that are output as filtered signal samples. The second processing channel receives the down converted signal samples and uses compensation and equalization filter coefficients, timing parameters, and the scaling from the first processing channel in compensation, resampling and equalization filters and a scaler to produce compensated, time-aligned, scaled equalized signal samples that are output as unfiltered signal samples.

Title
Measurement receiver demodulator
Application Number
9/185419
Publication Number
6671334 (B1)
Application Date
November 3, 1998
Publication Date
December 30, 2003
Inventor
Kyle L Bernard
Tigard
OR, US
Nikhil M Deshpande
Beaverton
OR, US
Xiaofen Chen
West Linn
OR, US
Thomas L Kuntz
Portland
OR, US
Agent
William K Bucher
US
Assignee
Tektronix
OR, US
IPC
H04L 27/06
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