Encoding method, encoding apparatus, decoding method, decoding a

Details Encoding method, encoding apparatus, decoding method, decoding a Encoding method, encoding apparatus, decoding method, decoding a

1997-12-09

2000-11-28

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375262, 375295, 375341, 714791, H04L 512

Patent

active

06154504&

ABSTRACT:
Partial response (1, 1) is applied to a partitioned MSN (partitioned-matched spectral null) code. A branch metric (BM) obtained in a calculation block is directly supplied to a selector, and it is also supplied to the selector via an adder. The adder adds a predetermined value to the branch metric in such a manner as to decrease the degree of likelihood associated with a state transition corresponding to the branch metric. A determination block detects an invalid state transition in a detection trellis, which cannot be generated by the partitioned MSN code, on the basis of the number of 1s or 0s included in the partitioned MSN code. The selector selects either the branch metric added with the predetermined value or the branch metric added with no predetermined value depending on the detection result of the determination block. A path metric is calculated using the selected branch metric added with the predetermined value or added with no predetermined value.

REFERENCES:
patent: 5095484 (1992-03-01), Karabed et al.
patent: 5280489 (1994-01-01), Fredrickson et al.
patent: 5379306 (1995-01-01), Noma et al.
patent: 5548800 (1996-08-01), Fredrickson et al.
patent: 5781590 (1998-07-01), Shiokawa et al.
H. Thapar et al., "On the Performance of a Rate 8/10 Matched Spectral Null Code for Class-4 Partial Response," IEEE Transactions on Magnetics, vol. 28, No. 5, Sep. 1992, pp. 2883-2888.
L. Fredrickson et al., "Improved Trellis-Coding for Partial-Response Channels," IEEE Transactions on Magnetics, vol. 31, No. 2, Mar. 1995, pp. 1141-1148.

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