Multipath wave-signal receiving apparatus

Abstract

Abstract IN A MODULATED-CARRIER WAVE SIGNAL-TRANSLATING SYSTEM INCLUDING A TRANSMITTER AND A RECEIVER INTERRELATED BY A MULTIPATH RADIO LINK HAVING NONLINEAR PHASE CHARACTERISTICS, THERE IS PROVIDED AT THE RECEIVER AN APPARATUS FOR MINIMIZING FADING DUE TO MULTIPATH EFFECTS AND FOR MINIMIZING SIGNAL DISPERSION AND DISTORTION DUE TO SUCH PHASE CHARACTERISTICS WHICH COMPRISES AN INPUT CIRCUIT FOR THE RECEIVED MULTIPATH SIGNALS, AN OSCILLATOR COUPLED TO THE INPUT CIRCUIT FOR GENERATING OSCILLATIONS HAVING A FREQUENCY EQUAL TO THE AVERAGE CARRIER FREQUENCY OF THE RECEIVED SIGNALS, SINE AND COSINE DIVERSITY DEMODULATORS COUPLED TO THE INPUT CIRCUIT AND THE OSCILLATOR WITH ONE OF THE COUPLINGS TO ONE OF THE DEMODULATORS INCLUDING A 90* PHASE SHIFT, TOGETHER WITH A PAIR OF PARTICULARLY MATCHED CORRECTING NETWORKS INDIVIDUALLY COUPLED TO THE DEMODULATORS, EACH CORRECTING NETWORK HAVING AN IMPULSE RESPONSE WHICH IS THE TIME REVERSE OF THE IMPULSE RESPONSE OF THE SIGNAL TRANSLATING CHANNEL INCLUDING ITS ASSOCIATED DEMODULATOR AND MULTIPATH RADIO LINK. THE OUTPUTS OF THE TWO CORRECTING NETWORKS ARE COUPLED TO A LINEAR COMBINING STAGE, WHEREBY THERE IS DEVELOPED A RESULTANT SIGNAL OF RELATIVELY CONSTANT AMPLITUDE AND RELATIVELY FREE FROM THE EFFECTS OF MULTIPATH DISPERSION AND DISTORTION OF THE RADIO LINK.

Inventors

• 👤 Michael J Di Toro

Bibliographic Details