Noise predictive maximum likelihood (NPML) detection methods and

Details Noise predictive maximum likelihood (NPML) detection methods and Noise predictive maximum likelihood (NPML) detection methods and

1996-09-17

2000-08-15

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375232, 375262, 375263, 714794, H03D 100

Patent

active

06104766&

ABSTRACT:
The invention is family of noise predictive maximum liklihood (NPML) symbol detectors that are particularly useful in direct access storage devices. Various embodiments representative of the family of detectors are described. In general, the NPML detectors include a sequence detector with imbedded feedback which may be preceded by a filter, e.g., a prediction error filter. The sequence of detectors, which may be Viterbi detectors, have an imbedded filter whose coefficients are determined by the convolution of the partial response (PR) or generalized PR function with the predictor coefficients and do not require multiplications and, thus, allows a simple RAM look-up for intersymbol-interference ISI cancelation. In one class of embodiments, the NPML detector comprises a prediction error filter of length N, cascaded with a sequence detector having 2.sup.K states, and a feedback filter imbedded in the sequence detector, having a length N+P-K, where P is length of the generalized PR shaping polynomial (P=2 yields PR4), and 0.ltoreq.K.ltoreq.N+P.

REFERENCES:
patent: 4571734 (1986-02-01), Dolivo et al.
patent: 4631735 (1986-12-01), Qureshi
patent: 4707681 (1987-11-01), Eggenberger et al.
patent: 4713829 (1987-12-01), Eyuboglu
patent: 4786890 (1988-11-01), Marcus et al.
patent: 4833693 (1989-05-01), Eyuboglu
patent: 4866736 (1989-09-01), Bergmans
patent: 5003555 (1991-03-01), Bergmans
patent: 5031195 (1991-07-01), Chevillat et al.
patent: 5196849 (1993-03-01), Galbraith
patent: 5220466 (1993-06-01), Coker et al.
patent: 5258940 (1993-11-01), Coker et al.
patent: 5285480 (1994-02-01), Chennakeshu et al.
patent: 5341387 (1994-08-01), Nguyen
patent: 5357520 (1994-10-01), Arnett et al.
patent: 5422760 (1995-06-01), Abbott et al.
patent: 5440588 (1995-08-01), Murakami
patent: 5453797 (1995-09-01), Nicolas et al.
patent: 5486956 (1996-01-01), Urata
patent: 5513216 (1996-04-01), Gadot et al.
patent: 5546430 (1996-08-01), Liao et al.
patent: 5588011 (1996-12-01), Riggle
patent: 5734680 (1998-03-01), Moore et al.
patent: 5768320 (1998-06-01), Kovacs et al.
patent: 5822143 (1998-10-01), Cloke et al.
G. D. Forney, "Maximum-Likelihood Estimation Of digital Sequences In The Presence Of Intersymbol Interference," IEEE Trans. Inform Theory, vol. IT-18, No. 3, May 1972, pp. 363-378.
P. R. Chevillat et al., Noise Predictive Partial-Response Equalizers And Applications, IEEE Conf. Records, ICC'92, Jun. 14-18, 1992, pp. 0942-0947.
R. D. Cideciyan et al., "A PRML System For Digital Magnetic Recording," IEEE Journal on Selected Areas In Communications, vol. 10, No. 1, Jan. 1992, pp. 38-56.
A. P. Hekstra, "An Alternative To Metric Rescaling In Viterbi Decoders," IEEE Transactions on Communications, vol. 37, No. 11, Nov. 1989, pp. 1220-1222.
A. H. Shakiba et al., "Analog Implementation Of Class-IV Partial-Response Viterbi Detector," Proc. ISCAS'94, 1994.
A. Eshraghi et al., "Design Of A New Squaring Function for The Viterbi Algorithm," IEEE Journal of Solid State Circuits, vol. 29, No. 9, Sep. 1994, pp. 1102-1107.
T. Wang et al., "Improved Adaptive Decision-Feedback Equalization With Interleaving For Coded Modulation Systems", Proceedings Of The Global Telecommunications Conference (GLOBECOM), San Francisco, Nov. 28-Dec. 2, 1994, vol. 1 of 3, Nov. 28, 1994, pp. 6-10, IEEE.
D. W. Lin et al., "Receiver Optimization For Dispersive Channels Employing Coded Modulation, With Application In High Rate Digital Subscriber Line Transmission," ICC'90, Atlanta, Apr. 15-19, 1990, vol. 4 of 4, Apr. 15, 1990, pp. 1742-1746 IEEE.

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