Erasure zone decision feedback phase lock loop for carrier recov

Details Erasure zone decision feedback phase lock loop for carrier recov Erasure zone decision feedback phase lock loop for carrier recov

1979-04-06

1981-08-11

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

375 42, 375 81, H03D 318

Patent

active

042836824

ABSTRACT:
An improved decision feedback phase lock loop having an erasure zone detector and a feedback loop interrupting switch responsive to the output of the erasure zone detector which cooperate to eliminate from the feedback loop those error signals corresponding to detected data falling within certain predetermined regions of the encoding constellation. The erasure zone detector compares the complex input signal to certain predetermined erasure zone reference signals so as to determine when the input signal falls within an erasure zone and correspondingly actuates the loop switch to prevent certain feedback error signals from being input to the loop filter.

REFERENCES:
patent: 3710261 (1973-01-01), Low et al.
patent: 3806815 (1974-04-01), Fletcher et al.
Akashi et al., "A High Performance Digital QAM 9600 bit/s Modem", NEC Research and Development Journal, No. 45, Apr. 1977, pp. 38-49.

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