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US 5,703,908 AGranted
Fixed reference shift keying modulation for mobile radio telecommunications
AssigneeRutgers University
InventorsRichard J. Mammone, Kevin Farrell, Brian Freeman
Life of this patent
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Abstract
A method and apparatus for improved mobile radio telecommunications employs the transmission of a pilot reference signal within the coherence band of the modulated carrier wave. The receiver in this system uses instantaneous phase estimation techniques of the pilot and carrier received waveforms to provide immunity from phase distortion introduced by the channel.
Claims16
A phase modulated communication system including:
- transmitter means for transmitting a phase modulated carrier wave and a tone signal, the tone signal being within 1 coherence band of the carrier wave;
- and
- a receiver means for receiving the transmitted tone signal and phase modulated carrier wave;
- wherein
- the receiver means includes means for separating the tone signal and phase modulated carrier wave and means for estimating the instantaneous phase of the tone signal and phase modulated carrier wave to obtain a relative phase measurement between the tone signal and the phase modulated carrier wave.
2 more elements
A receiver for receiving communications signal, the receiver including:
- means for receiving a transmitted tone signal and a phase modulated carrier wave wherein the tone signal is within the coherence band of the phase modulated carrier wave;
- and
- means for separating the tone signal and phase modulated carrier wave and means for estimating the instantaneous phase of the tone signal and phase modulated carrier wave to obtain a measurement of the relative phase between the phase modulated carrier wave and the tone signal.
A method for reducing effects of distortion in a communication channel comprising the steps of:
- transmitting a phase modulated carrier wave and a tone signal, the tone signal being within the coherence band of the phase modulated carrier wave;
- receiving the tone signal and phase modulated carrier wave;
- and
- estimating the relative instantaneous phase of the phase modulated carrier wave and the tone signal to obtain a measurement of the relative phase between the phase modulated carrier wave and the tone signal.
1 more element
Dependencies are inferred from the claim text.