Trellis codes for partial response channels

Details Trellis codes for partial response channels Trellis codes for partial response channels

1988-03-18

1989-12-19

Smith, Jerry

Excavating

371 374, G06F 1110

Patent

active

048887757

ABSTRACT:
An improved method is described for coding input strings to improve reliability of partial response channels. This method comprises encoding an input string into an intermediate string using a binary convolutional code, and encoding the intermediate string using a nonlinear inner code that repeats and inverts selected bits of the intermediate string. The inner code has a coding rate of less than one. As specifically illustrated, this method provides coding gains for partial response channels of at least 4.8 dB.

REFERENCES:
patent: 4707681 (1987-11-01), Eggenberger
patent: 4786890 (1988-11-01), Marcus
J. K. Wolf and G. Ungerboeck, "Trellis Coding for Partial-Response Channels", IEEE Trans. Comm., vol. COM-34, No. 8, Aug. 1986, pp. 765-773.
T. A. Lee and C. Heegard, "An Inversion Technique for the Design of Binary Convolutional Codes for the 1-D.sup.N Channel", Proc. IEEE Regional Meeting, John Hopkins, Feb. 1985.
A. R. Calderbank, C. Heegard and T. A. Lee, "Binary Convolutional Codes with Application to Magnetic Recording", IEEE Trans. Info. Th., vol. IT-32, No. 6, Nov. 1986, pp. 797-815.
H. Thapare and A. Patel, "A Class of Partial Response Systems for Increasing Storage Density in Magnetic Recording", presented at Intermag 1987, Tokyo, Japan.

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