Pulse or digital communications – Repeaters – Testing
Patent
1983-09-14
1985-09-03
Masinick, Michael A.
Pulse or digital communications
Repeaters
Testing
375 15, 375118, 455229, H04B 304
Patent
active
045396892
ABSTRACT:
An automatic adaptive equalizer operative on a test pattern including a carrier-only period, clock-only period and a single test impulse. The equalizer employs a transversal filter under control of a microprocessor. Samples of in-phase and quadrature phase components of the received impulse response are cross correlated and autocorrelated to form elements of a complex matrix equation describing the optimum equalizer tap settings. The microprocessor performs a special interative operation utilizing elements of this equation to rapidly and exactly calculate the optimum initial settings for the tap constants. The clock-only portion of the test pattern is analyzed to accurately set a sampling clock to properly sample the received impulse so that matrix formation can be carried out within the duration of the received impulse. Initial equalization can be achieved in a time on the order of 30 milliseconds at a data rate of 9600 bits per second.
REFERENCES:
patent: 3614623 (1971-10-01), McAuliffe
patent: 3935535 (1976-01-01), Motley et al.
patent: 3962637 (1976-06-01), Motley
patent: 3992616 (1976-11-01), Acker
patent: 4004226 (1977-01-01), Qureshi
patent: 4027250 (1977-05-01), Lang
patent: 4035625 (1977-01-01), Chiu et al.
patent: 4053837 (1977-10-01), Ryan
patent: 4061977 (1977-12-01), Motley
patent: 4061978 (1977-12-01), Motley
Zohar, The Solution of a Toeplitz Set of Linear Equations, Journal of Association of Computing Machinery, vol. 21, No. 2, Apr. 1971, pp. 272-276.
Farden, Solution of a Toeplitz Set of Linear Equations, IEEE Transactions on Antenna and Propagation, Nov. 1976, pp. 906-907.
Trench, An Algorithm for the Inversion of Finite Toeplitz Matrices, J. Soc. in Bo. Wt., Appl. Matel., vol. 12, No. 3, Sep. 1964.
Butler, Non Iterative Automatic Equalizer, IEEE Transactions on Communications, vol. COM-23, No. 6, Jun. 1975, pp. 621-632.
Chiu Ran F.
Kao Ming L.
Kromer, III Philip F.
Parrish Henry H.
Masinick Michael A.
Racal Data Communications Inc.
LandOfFree
Fast learn digital adaptive equalizer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fast learn digital adaptive equalizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast learn digital adaptive equalizer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-617656