Viterbi IP Core User Guide

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ID 683280
Date 11/06/2017
Public
Document Table of Contents
Document Table of Contents x
1. About the Viterbi IP Core 2. Viterbi IP Core Getting Started 3. Viterbi IP Core Functional Description A. Viterbi IP Core User Guide Document Archives 4. Document Revision History
1. About the Viterbi IP Core x
1.1. Intel® DSP IP Core Features 1.2. Viterbi IP Core Features 1.3. DSP IP Core Device Family Support 1.4. DSP IP Core Verification 1.5. Viterbi IP Core Release Information 1.6. Viterbi IP Core Performance and Resource Utilization
2. Viterbi IP Core Getting Started x
2.1. Installing and Licensing Intel® FPGA IP Cores 2.2. IP Catalog and Parameter Editor 2.3. Generating IP Cores ( Intel® Quartus® Prime Pro Edition) 2.4. Simulating Intel® FPGA IP Cores 2.5. DSP Builder for Intel® FPGAs Design Flow
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode 2.1.2. Viterbi IP Core Intel® FPGA IP Evaluation Mode Timeout Behavior
2.3. Generating IP Cores ( Intel® Quartus® Prime Pro Edition) x
2.3.1. IP Core Generation Output ( Intel® Quartus® Prime Pro Edition)
3. Viterbi IP Core Functional Description x
3.1. Decoder 3.2. Convolutional Encoder 3.3. Trellis Coded Modulation 3.4. Viterbi IP Core Parameters 3.5. Viterbi IP Core Interfaces and Signals
3.3. Trellis Coded Modulation x
3.3.1. Half-Rate Convolutional Codes 3.3.2. Trellis Decoder 3.3.3. About Converting Received Signals 3.3.4. Trellis Termination 3.3.5. Trellis Initialization
3.4. Viterbi IP Core Parameters x
3.4.1. Architecture 3.4.2. Code Sets 3.4.3. Viterbi Parameters 3.4.4. Test Data
3.4.1. Architecture x
3.4.1.1. BER Estimator 3.4.1.2. Node Synchronization
3.4.3. Viterbi Parameters x
3.4.3.1. Soft Symbol Input 3.4.3.2. State Metrics 3.4.3.3. Throughput Calculator 3.4.3.4. Latency Calculator
3.4.4. Test Data x
3.4.4.1. External Puncturing
3.5. Viterbi IP Core Interfaces and Signals x
3.5.1. Avalon-ST Interfaces in DSP IP Cores 3.5.2. Global Signals 3.5.3. Avalon-ST Sink Signals 3.5.4. Avalon Source-ST Signals 3.5.5. Configuration Signals 3.5.6. Status Signals 3.5.7. Viterbi IP Core Timing Diagrams
1. About the Viterbi IP Core
2. Viterbi IP Core Getting Started
3. Viterbi IP Core Functional Description
A. Viterbi IP Core User Guide Document Archives
4. Document Revision History

3.4.3.1. Soft Symbol Input

The number of soft decision bits per symbol, softbits, represent 2 softbits – 1 soft 0s and 2 softbits – 1 soft 1s. The input values represent received signal amplitudes. If the input is in log-likelihood format, a transformation is required and you must use extra softbits to retain signal integrity. The decoder marks depunctured values separately. The decoder allows a hard-decision input when softbits = 1.

Table 9.  Soft Symbol Input Representation softbits = 3
Soft Symbol Meaning
011 Strongest '0'
010 Strong '0'
001 Weak '0'
000 Weakest '0'
111 Weakest '1'
110 Weak '1'
101 Strong '1'
100 Strongest '1'
Level Two Title