Phase perturbation compensation system

Details Phase perturbation compensation system Phase perturbation compensation system

1988-09-22

1989-07-18

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375 13, 375103, H04L 704

Patent

active

048499960

ABSTRACT:
In a phase perturbation compensation system for use in a data modem receiver, the signal from an equalizer is fed to a phase and amplitude correction circuit which is connected to a decision circuit providing a data output signal and a phase error output signal which is applied to a phase jitter compensation determination circuit. The phase jitter compensation determination circuit includes a tapped delay line the output taps of which are applied to multipliers fed with adaptive weighting coefficients to provide values which are summed to provide a phase error prediction signal. The weighting coefficients are generated in integrator circuits which include respective delays. The values generated in the delays during an initial training sequence and stored in a storage device are retrieved for use in subsequent training segments, whereby fast phase jitter adaptation is achieved and hence stort training sequences can be utilized.

REFERENCES:
patent: 4273955 (1981-06-01), Armstrong
patent: 4301417 (1981-11-01), Jansen et al.
patent: 4320526 (1982-03-01), Gitlin
patent: 4362997 (1982-12-01), van Driest
patent: 4528519 (1985-07-01), van Driest
patent: 4530104 (1985-07-01), Kamerman
patent: 4577334 (1986-03-01), Boer et al.
patent: 4606045 (1986-08-01), Miller
patent: 4792964 (1988-12-01), Yoshida
Bennett, W. R. and Davey, J. R.; Data Transmission; McGraw-Hill, New York, 1965; pp. 182-190.
Lucky, R. W., Salz, Jr. and Weldon, E. J.; Principles of Data Communication; McGraw-Hill, New York, 1968; pp. 226-232.
Bird, J. S.; Error Performance of Binary NCFSK in the Presence of Multiple Tone Interference and System Noise: IEEE Transaction on Communications, vol. COM-33, No. 3, Mar. 1985; pp. 203-209.
Sundberg, C. E.; Continuous Phase Modulation; IEEE Communications Magazine, vol. 24, No. 4, Apr. 1986; pp. 25-38.
Ansari, R. and Liu, B.; A Class of Low Noise Computationally Efficient Recursive Digital Filters; Proceedings IEEE International Symposium Circuits and Systems, Apr. 1981; pp. 550-553.
Ansari, R. and Liu, B.; A Class of Low Noise Computionally Efficient Recursive Digital Filters with Applications to Sampling rate Alterations; IEEE Transactions on Acoustics, Speech & Signal Processing, vol. ASSP-33, No. 1, 2/85.
Jennings, F.; Practical Data Communications--Modems, Networks, Protocols; Blackwell Scientific Publications, Oxford, 1986, p. 48.
Godard, D. N.; Pass-Band Timing Recovery in an All-Digital Modem Receiver; IEEE Transactions on Communications, vol. COM-26, No. 5; May 1978.
Abramowitz, M., Stegun, J. A., Handbook of Mathematical Functions; Dover Publications Inc., New York, 1972; formula 4.3.100, p. 76.
Idem Reference Abramowitz, M., Stegun, J. A.; formula 25.2.6, 25.2.7, p. 878.
CCITT--Data Communication over the Telephone Network--vol. VIII--Fascicle VIII.1--Recommendations of the V-Series; Geneva 1985, Recommendation V29; pp. 203-215.
Carey, M. B., Chen, H. T.; Descloux, A., Ingle, J. F. and Clark K. I.; 1982/83 End Office Connection Study--AT&T Bell Laboratories Technical Journal, vol. 63, No. 9, Nov. 1984; pp. 2059-2119.
Motorola Inc., 2605 Series Data User Manual, Aug. 1984, Motorola Inc., Mansfield, Mass.
Racal Milgo's 14400 Bit/s System Modem Omnimode 14.4 Manual.

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