4G Turbo-V Intel® FPGA IP User Guide

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ID 683882
Date 4/01/2024
Public
Document Table of Contents
Document Table of Contents x
1. About the 4G Turbo-V Intel® FPGA IP 2. Getting Started with 4G Turbo-V IP 3. Designing with the 4G Turbo-V Intel® FPGA IP 4. 4G Turbo-V Intel® FPGA IP Functional Description 5. 4G Turbo-V Intel FPGA IP User Guide Document Archive 6. Document Revision History for the 4G Turbo-V Intel® FPGA IP User Guide
1. About the 4G Turbo-V Intel® FPGA IP x
1.1. 4G Turbo-V Intel® FPGA IP Features 1.2. 4G Turbo-V Intel® FPGA IP Device Family Support 1.3. 4G Turbo-V IP Release Information 1.4. 4G Turbo-V Performance and Resource Utilization
2. Getting Started with 4G Turbo-V IP x
2.1. Installing and Licensing Intel® FPGA IP Cores
2.1. Installing and Licensing Intel® FPGA IP Cores x
2.1.1. Intel® FPGA IP Evaluation Mode 2.1.2. 4G Turbo-V IP Timeout Behavior
3. Designing with the 4G Turbo-V Intel® FPGA IP x
3.1. Generating a 4G Turbo-V IP 3.2. Simulating the IP with the RTL Simulator 3.3. Simulating a 4G Turbo-V IP with MATLAB 3.4. Simulating a 4G Turbo-V IP with C-Models
4. 4G Turbo-V Intel® FPGA IP Functional Description x
4.1. 4G Turbo-V Downlink Accelerator 4.2. 4G Turbo-V Uplink Accelerator 4.3. 4G Turbo-V Signals and Interfaces
4.1. 4G Turbo-V Downlink Accelerator x
4.1.1. Turbo Encoder 4.1.2. Rate Matcher 4.1.3. Input and Output Data Formats 4.1.4. Latency Calculations 4.1.5. Throughput Calculations
4.2. 4G Turbo-V Uplink Accelerator x
4.2.1. Turbo Decoder 4.2.2. Input and Output Data Formats 4.2.3. Latency Calculations 4.2.4. Throughput Calculations
4.3. 4G Turbo-V Signals and Interfaces x
4.3.1. Avalon Streaming Interfaces in DSP Intel FPGA IP
1. About the 4G Turbo-V Intel® FPGA IP
2. Getting Started with 4G Turbo-V IP
3. Designing with the 4G Turbo-V Intel® FPGA IP
4. 4G Turbo-V Intel® FPGA IP Functional Description
5. 4G Turbo-V Intel FPGA IP User Guide Document Archive
6. Document Revision History for the 4G Turbo-V Intel® FPGA IP User Guide

4.1.1. Turbo Encoder

The 3GPP Turbo encoder uses a parallel concatenated convolutional code. A convolutional encoder encodes an information sequence and another convolutional encoder encodes an interleaved version of the information sequence. The Turbo encoder has two 8-state constituent encoders and one Turbo code internal interleaver. The Turbo encoder accepts K bits and outputs 3K+12 bits, having a natural code rate 1/3. The last 12 output bits of every packet are termination bits, which guarantee that the state of the encoder is back to state zero in the end of encoding process.
Figure 5. Turbo Encoder Block Diagram

The output from the turbo coder is:

X 0, Z 0, Z’ 0, X 1, Z 1, Z’ 1, ..., X K–1, Z K–1, Z’ K–1

Where:

  • Bits X 0, X 1, ..., X K–1 are input to both the first 8-state constituent encoder and the internal interleaver (K is the number of bits).
  • Bits Z 0, Z 1, ..., Z K–1 and Z’ 0, Z’ 1, ..., Z’ K–1 are output from the first and second 8-state constituent encoders.
  • The bits output from the internal interleaver (and input to the second 8-state constituent encoder) are X’ 0, X’ 1, ..., X’ K–1.
  • Additionally, encoder outputs 12 termination bits, X K , X K+1, X K+2, X’ K, X’ K+1, X’ K+2, Z K, Z K+1, Z K+2, Z’ K, Z’ K+1, Z’ K+2.
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