DSP56300 datasheet(30/108 Pages) FREESCALE

Part #	DSP56300

Description	Implementing Viterbi Decoders Using the VSL Instruction on DSP Families

PDF	108 Pages

Scroll/Zoom	100%

Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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30 / 108 page

3-2

Viterbi Decoder Implementation

Expanding the Viterbi Algorithm

3.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.2

Partitioning the Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.3

The Inner Loop: Viterbi Butterflies . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.4

Creating the Branch Metrics . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3.5

Storing the Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

3.6

Traceback: Obtaining the Decoder Output . . . . . . . . . . . . . . . .3-13

3.7

Main: Gluing the Pieces Together . . . . . . . . . . . . . . . . . . . . . . .3-17

3.8

Memory Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19

Freescale Semiconductor, Inc.

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DSP56300 Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc