Matched spectral null trellis codes for partial response channel

Details Matched spectral null trellis codes for partial response channel Matched spectral null trellis codes for partial response channel

1988-03-18

1989-12-19

Smith, Jerry

Excavating

G06F 1100

Patent

active

048887790

ABSTRACT:
A method is disclosed for coding input strings for a partial response channel to provide an output having a reliability determined by a preselectable coding gain. This method involves determining each frequency at which there is a zero in the transfer function of the partial response channel, and then encoding an input string into a binary code string having a power spectrum value of zero for each such frequency. A channel output sequence is generated responsively to transmission of the code string through the channel. The most probable sequence among those having a power spectrum value of zero is then calculated from the channel output sequence and decoded to provide the output.

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