Turbo Decoder


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IP ExpressTurbo coding is an advanced error correction technique widely used in the communications industry. Turbo encoders and decoders are key elements in today's communication systems to achieve the best possible data reception with the fewest possible errors. The basis of turbo coding is to introduce redundancy in the data to be transmitted through a channel. The redundant data helps to recover original data from the received data. In data transmission, turbo coding helps achieve near Shannon limit performance.

Lattice provides a Turbo Decoder IP core that is both flexible and compliant with two different standards, 3GPP and CCSDS. 3GPP is widely used in WCDMA and MC-CDMA applications while CCSDS is most commonly found in telemetry and space communications.

Lattice also supplies users with a Turbo Encoder core providing users a complete state of the art error correction solution.

Features

  • Compliant with Standards:
    • 3GPP TS 25.212 version 4.2.0
    • CCSDS 101.0-B-5
  • Throughput of 2Mbps for 3GPP at 30MHz, 7 Iterations
  • Two's Complement Data/Parity Input
  • Supports Depuncturing
  • Variable Soft-Widths for Input Symbols, Branch Metrics, Path Metrics and LLRs
  • User-Defined Number of States
  • Variable Block Sizes During Runtime
  • Programmable Number of Iterations
  • Optional Hard Decision Storage
  • Selectable Max-Log-Map or Log-Map Algorithm
  • Programmable Pipe Stages for Convenient Memory Interfacing
  • Optional Double Buffering

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Block Diagram

Turbo Decoder

Performance and Size

Results for ORCA41
Parameter File Mode ORCA4 PFUs LUTs Registers PIO EBR Fmax
turbo_deco_o4_1_001.lpc 3GPP 1235 3750 3569 184 N/A 46 MHz
turbo_deco_o4_1_003.lpc CCSDS 1674 3292 4807 191 N/A 36 MHz

1 Performance and utilization characteristics are generated targeting an OR4E06-2BA352 in ispLEVER™ v.3.0 software.

Results for ispXPGA1
Parameter File Mode ispXPGA PFUs LUTs Registers PIO EBR Fmax
turbo_deco_xp_1_001.lpc 3GPP 2167 4586 3628 184 32 52 MHz
turbo_deco_xp_1_003.lpc CCSDS 3486 5834 4966 269 49 46 MHz

1 Performance and utilization characteristics are generated targeting an LFX1200B-04FE680C in ispLEVER™ v.3.0 software.

Results for LatticeECP™/LatticeEC™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2676 5230 2838 184 17 82
3GPP2 2834 5510 3020 249 49 84
CCSDS 4124 8093 4294 269 25 68

1 Performance and utilization characteristics are generated using LFEC33E-5F672C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP/EC family, performance may vary.

Results for LatticeECP2™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2732 5365 2831 184 13 126
3GPP2 2801 5490 3015 249 27 124
CCSDS 4274 8433 4295 269 16 115

1 Performance and utilization characteristics are generated using LFE2-70E-7F672C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP2 family, performance may vary.

Results for LatticeECP2M™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2747 5403 3085 184 13 110
3GPP2 2712 5311 3312 249 27 111
CCSDS 4238 8350 4540 269 16 100

1 Performance and utilization characteristics are generated using LFE2M-35E-7F672C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeECP2M family, performance may vary.

Results for LatticeXP™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2744 5372 2838 184 17 76
CCSDS 4162 8268 4316 269 25 65

1 Performance and utilization characteristics are generated using LFXP20E-5F484C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeXP family, performance may vary. Due to memory resource limitations, 3GPP2 support is not recommended for LatticeXP.

Results for LatticeXP2™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2801 5490 3077 184 17 98

1 Performance and utilization characteristics are generated using LFXP2-17E-5F484C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeXP2 family, performance may vary. Due to memory resource limitations, 3GPP2 and CCSDS support is not recommended for LatticeXP2.

Results for LatticeSC™1
IPexpress User-Configurable Mode SLICEs LUTs Registers I/Os sysMEM EBR Fmax (MHz)
3GPP 2766 5356 2827 184 13 172
3GPP2 2747 5334 3066 249 27 197
CCSDS 4008 7791 4326 269 16 174

1 Performance and utilization characteristics are generated using LFSC3GA25E-7F900C with Lattice’s ispLEVER v.7.1 SP1 software. When using this IP core in a different density, speed, or grade within the LatticeSC family, performance may vary.

Ordering Information

  Part Numbers
ORCA4 TURBO-DECO-O4-N1
ispXPGA TURBO-DECO-XP-N1
LatticeECP/EC TURBO-DECO-E2-U3
LatticeECP2 TURBO-DECO-P2-U3
LatticeECP2M TURBO-DECO-PM-U3
LatticeXP TURBO-DECO-XM-U3
LatticeXP2 TURBO-DECO-X2-U3
LatticeSC TURBO-DECO-SC-U3

To find out how to purchase the Turbo Decoder IP Core, please contact your local Lattice Sales Office.

Documentation

Quick Reference
Information Resources
Downloads
TITLE NUMBER VERSION DATE FORMAT SIZE
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Turbo Decoder IP Core User's Guide
IPUG14 04.4 11/11/2008 PDF 283.6 KB
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Wireless Solutions Brochure
I0197 3.0 8/14/2012 PDF 2 MB
Lattice HetNet Solutions Brochure
I0234 1.0 11/12/2013 PDF 2.2 MB
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IP Module Evaluation Tutorial
8/1/2004 PDF 216.1 KB
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Evaluation Package for Turbo Decoder for ORCA 4 - Configuration 2
5/1/2003 ZIP 2 MB
Evaluation Package for Turbo Decoder for ispXPGA - Configuration 1
7/1/2003 ZIP 4.5 MB
Evaluation Package for Turbo Decoder for LatticeECP/EC - Configuration 3
10/1/2004 ZIP 1.9 MB
Evaluation Package for Turbo Decoder for ispXPGA - Configuration 3
7/1/2003 ZIP 6.6 MB
Evaluation Package for Turbo Decoder for LatticeECP/EC - Configuration 1
10/1/2004 ZIP 1.4 MB
Evaluation Package for Turbo Decoder for ORCA 4 - Configuration 1
5/1/2003 ZIP 1.7 MB

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