Phase jitter compensation arrangement using an adaptive IIR filt

Details Phase jitter compensation arrangement using an adaptive IIR filt Phase jitter compensation arrangement using an adaptive IIR filt

1988-06-22

1989-07-11

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

3647242, H04B 314

Patent

active

048478644

ABSTRACT:
A voice-band data symbol is typically impaired by so-called phase jitter prior to symbol being received at a data modem. Modem circuitry estimates the phase angle of the jitter and an infinite-impulse-response (IIR) filter adjusts to that phase angle so that the jitter can be corrected for by a demodulator circuit. Advantageously, the IIR filter is arranged so that its pair of complex, conjugate poles are initially positioned at a first predetermined radius within a unit circle. The angular displacement of the poles around the unit circle is adaptively increased in response to receipt of a series of such estimates until such displacement substantially equals the phase angle of the jitter. The poles are then positioned at a second predetermined radius to increase the gain of the filter.

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