Patent ID: 6389080
Filing Date: 2002-05-14
Classification: H04L

Abstract:
A communication architecture comprising:(1) a transmitter comprising: a data source; a mapper coupled to the data source that produces an amplitude phase keyed (APK) waveform having a plurality of symbol phases; a transmitter multiplier for multiplying random phase signals having a random phase sequence with the APK waveform to produce a random phase keyed output signal; a vector modulator that modulates the random phase keyed output signal to produce a modulated random phase keyed output signal; and a transmitter mixer that mixes the modulated random phase keyed output signal with a local oscillator signal output by a transmit local oscillator to produce a modulated carrier signal having a large number of unique phase states for transmission over a communication channel; (2) a receiver comprising: a demodulator comprising a receiver mixer that mixes the received modulated carrier signal with a local oscillator signal derived from a receive local oscillator to produce an estimate of the random phase keyed signal; a receiver multiplier for multiplying a random phase signal with the estimated random phase keyed signal to produce an estimated APK waveform; and a carrier tracking phase lock loop coupled between the receiver multiplier and the receive local oscillator for processing the estimated APK waveform to track the received modulated carrier signal.