CHANNEL IMPULSE RESPONSE ESTIMATOR FOR USE IN AN ADAPTIVE MAXIMUM LIKELIHOOD SEQUENCE ESTIMATION RECEIVER WHICH IS APPLICABLE TO A COMMUNICATION SYSTEM HAVING A CHANNEL CHARACTERISTIC WITH RAPID FLUCTUATION

摘要

In a channel impulse response estimator, a localpreamble generator generates a local preamble signal identicalwith a transmission preamble signal in a received signal. Apreamble detector detects the transmission preamble signal inan estimated sequence signal to produce a preamble detectionsignal. Responsive to the preamble detection signal, a sequenceselector selects one of the local preamble signal and theestimated sequence signal as a selected sequence signal whichis supplied to a re-modulator. Responsive to the preambledetection signal, a step-size generator generates one of firstand second step-size signals as a selected step-size signalwhich is supplied to a tap coefficient producer.