Data transmission with dual psk modulation

Details Data transmission with dual psk modulation Data transmission with dual psk modulation

H - Electricity

03

C

332/60

H03C 3/00 (2006.01) H03K 7/06 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1060554

ABSTRACT OF THE DISCLOSURE A binary data stream of cadence f to be transmitted by PSK (phase-shift keying) modulation is split into two pulse sequences, composed of alternate bits of that data stream, which are translated into 180° phase shifts of respective sinusoidal carrier waves in quadrature with each other, the frequency f of the two carrier waves being the reciprocal of the pulse width 2/f of the two pulse sequences in a specific instance. A pair of interleaved trains of trigger pulses, each coinciding with the zero crossings of a re- spective carrier wave, enable the operation of associated phase shifters -- in response to amplitude changes of the respective pulse sequences -- only at a peak of a carrier wave in trailing position or at a zero crossing of a carrier wave in leading position, thereby minimizing the amplitude excursions occurring upon a subsequent passage of the combined carrier waves through a band-pass filter or other network of limited bandwidth.

204555

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