Pulse or digital communications – Equalizers – Automatic
Patent
1996-08-06
1997-12-02
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
375232, H03H 730, H03K 5159
Patent
active
056944233
ABSTRACT:
Convergence of blind fractionally spaced equalizers is improved, and misconvergence is corrected by training the equalizers to detect convergence of one adaptive filter, copying the tap weights of the converged adaptive filter to the other adaptive filters and shifting the tap weights of the other adaptive filters according to the expected phase difference between the respective filters. In a two-dimensional orthogonal modulation scheme the converged weights of a first filter are copied to a second filter and shifted .pi./2. For the two dimensional orthogonal modulation scheme, the probability of a proper convergence can be increased by choosing initial tap weights for the two adaptive filters with a 3.pi./4 phase difference.
REFERENCES:
patent: 5230007 (1993-07-01), Baum
patent: 5416799 (1995-05-01), Currivan et al.
patent: 5455819 (1995-10-01), Sugiyama
patent: 5517435 (1996-05-01), Sugiyama
S.U.H. Qureshi, "Adaptive Equalization," Proceedings of IEEE, v. 73, No. 9, pp. 1349-1387 (1985).
G.H. Im, et al., "Bandwidth-Efficient Digital Transmission Over Unshielded Twisted-Pair Wiring," IEEE Journal on Selected Areas in Communications, v. 13, No. 9, pp. 1643-1655 (Dec. 1995).
R. D. Gitlin, et al., Data Communications Principles (1992).
D.N. Godard, "Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems," IEEE Transactions on Communications, v. 28, No. 11, pp. 1867-1875 (Nov. 1980).
G.H. Im, et al., "51.84 Mb/s 16-Cap ATM LAN Standard," IEEE Journal on Selected Areas in Communications, vol. 13, No. 4, pp. 620-632 (May 1995).
Larsson Patrik
Yu Meng-Lin
Chin Stephen
Deppe Betsy Lee
Lucent Technologies - Inc.
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