Patent Document ID: 5533063
Application ID: 08189959
Patent Flag: 1

Claim One:
1. A method for shaping the channel impulse response of a radio frequency communications channel and extracting digital data transmitted over said communications channel, comprising the steps of: (a) receiving and sampling a radio frequency signal on an antenna, said radio frequency signal containing digital information, said radio frequency signal being transmitted over a communications channel, said communications channel having a time-varying non-minimum phase channel impulse response, said radio frequency signal including a signal of interest and interference; (b) estimating said channel impulse response for said radio frequency signal; (c) filtering said received radio frequency signal using a non-causal digital allpass filter operating in reversed time, said digital allpass filter using filter coefficients determined from the estimated channel impulse response; (d) estimating a minimum phase desired impulse response for said filtered radio frequency signal, said estimated desired impulse response being the time reversal of said estimated channel impulse response; and (e) decoding data contained in said signal of interest using the estimated desired impulse response and the filtered radio frequency signal.