Modulator and demodulator apparatus as well as modulation and de

Details Modulator and demodulator apparatus as well as modulation and de Modulator and demodulator apparatus as well as modulation and de

1993-08-19

1996-09-24

Kizou, Hassan

Multiplex communications

Wide area network

Packet switching

370122, 375329, H04B 138, H04J 114, H04L 2722

Patent

active

055597998

ABSTRACT:
A modulator and demodulator apparatus for use with a network is provided. The modulator and demodulator apparatus comprises a modulation section which includes a timing phase discrimination section for receiving, as an input signal thereto, a demodulation vector signal sampled into a digital value and discriminating to which one of a plurality of regions of a discrimination plane the phase of the input signal belongs. The timing phase discrimination section supplies, as an input to a next processing stage, a rotation vector obtained by rotating an input vector, moves the rotation vector to a quadrant which includes a reference discrimination region of the discrimination plane and performs, when the vector after the movement is not in the reference discrimination region, a predetermined calculation. When the vector after the movement comes to the reference discrimination region, another calculation is performed. This discriminates a timing phase of the input vector from the result of the calculation.

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