Composite shift keying communication system

Details Composite shift keying communication system Composite shift keying communication system

1984-09-13

1986-03-18

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 51, 375 66, 375 91, 375104, 329112, 332 22, 332 23R, 340310R, H04L 2730

Patent

active

045773335

ABSTRACT:
A Composite Shift Keying (CSK) modulation technique is described which provides enhanced error detection capability in a noisy transmission medium, such as an AC power line. A modulating binary signal causes the generation of two of three possible transmitted signals, and when the modulating binary signal is idle, no signal is transmitted. When the modulating signal is active, a single frequency qualifying signal (of radian frequency Wqt) is transmitted. If the active binary signal is a logical 0, an additional single frequency (of radian frequency W0) is transmitted along with Wqt. If the active binary signal is a logical 1, a different single frequency (of radian frequency W1) is transmitted with Wqt.

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