Decoder for a trellis code

Details Decoder for a trellis code Decoder for a trellis code

2007-07-10

2007-07-10

Vo, Don N. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C714S792000

Reexamination Certificate

active

10781492

ABSTRACT:
The invention relates to trellis code decoder. The decoder comprises a path metrics calculation unit for calculating path metrics over at least two trellis columns in a trellis, and a memory for storing path metrics of the trellis. The decoder further comprises an input multiplexer connected between the read interface of the memory and the input interface of the path metrics calculation unit, and an output multiplexer connected between the output interface of the path metrics calculation unit and the write interface of the memory. The decoder further comprises a control for controlling configuration of the input multiplexer and configuration of the output multiplexer on the basis of states of the trellis, which state of the trellis defines the way the old path metrics and the new path metrics relate to each other, whereby internal configuration of the path metrics calculation unit remains the same for different code constraint lengths.

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