Patent ID: 6304614
Filing Date: 2001-10-16
Classification: H03M,H04L

Abstract:
An error correction phase-shift-keying communication system with removal of phase ambiguities, comprising:a communication channel having a phase modulator at an input side of the channel and a phase demodulator at an output side of the channel;a signal preprocessor and a differential encoder, the preprocessor comprising an error correction unit for correction of errors in signal generation, the differential encoder being connected between an output terminal of the preprocessor and an input terminal of the modulator;a signal post processor and a differential decoder, the differential decoder being connected between an output terminal of the demodulator and an input terminal of the post processor; andwherein an operational function of the differential decoder is inverse to an operational function of the differential encoder to provide for removal of a phase ambiguity produced within the signal channel; andthe processor of each of said preprocessor and said post processor comprises a one-dimensional coder and a convolutional encoder serially connected to each other for processing a least significant bit of an input signal of said processor to provide an output digit of an output signal of said processor; andlogic means including a full adder responsive to the output signal of said convolutional encoder and the next more significant bit of the input signal of said processor to provide a further digit of the output signal of said processor.