Digital demodulator reference signal generator having DC blocker

Details Digital demodulator reference signal generator having DC blocker Digital demodulator reference signal generator having DC blocker

1994-09-30

1996-08-27

Chin, Wellington

Pulse or digital communications

Receivers

375346, 375340, 375281, 375324, 329304, 329345, H04L 2722

Patent

active

055508669

ABSTRACT:
Information often modulates an underlying carrier signal, thereby producing a modulated information signal 70. This same carrier signal is required, with a few modifications, to demodulate the modulated information signal. This required signal is called the demodulator reference signal. It must be complex, that is, it must contain separate in-phase and quadrature outputs. A degraded version 10 of this signal is often available with the correct frequency, but with the wrong phase and amplitude, and with a direct current (dc) offset. The present invention 68 produces a digital demodulator reference signal 38, 46 from the degraded signal 10. It eliminates dc offset with a dc blocker 18, adjusts amplitude with a scaler 14, adjusts phase with a first Hilbert transformer 20, multipliers 26 and 28 and summer 34, and produces in-phase and quadrature outputs with a second Hilbert transformer 36 cascaded with the first.

REFERENCES:
patent: 5406587 (1995-11-01), Horwitz et al.

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