Partial response system with simplified detection

Details Partial response system with simplified detection Partial response system with simplified detection

1980-11-28

1984-03-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 39, 340347DD, H03K 1311

Patent

active

044398638

ABSTRACT:
A simple system is disclosed for detecting an 8 PSK (Phase Shift Keyed) - PRS (Partial Response System) signal output set, and other multi-level PSK and APSK (Amplitude and Phase Shift Keyed) - PRS signal sets. Quadrature interdependent channel decision feedback translates a reduced output signal set which is a scaled down version of the original full response input signal set before partial response filtering. The reduced output signal set has the same number of points and the same distribution array pattern as the input signal set. This enables the use of a conventional detector which need only detect the reduced signal set, not the complete output signal set. A decoder controls selection of predetermined interdependent signal value adjustments for each channel to translate the reduced output signal set in accordance with each successive signal relative to the then current signal value.

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patent: 3706054 (1970-11-01), Starr et al.
patent: 4110691 (1978-08-01), Lender
patent: 4123710 (1978-10-01), Stuart et al.
patent: 4140974 (1979-02-01), Lindner
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