Roohollah HassaniZadeh

1
Turbo Coding Applications

• Roohollah HassaniZadeh
• K.N.Toosi University of Technology
• 1383/6/22

2
Introduction

• Importance
• Turbo Coding
• BTC
• SCCC
• PCCC
• Interleaving
• Decoding Algorithms
• MAP
• SOVA

3
Applications

• Deep Space
• Multimedia
• UMTS
• Information
• Other

4
Applications

• Deep Space

5
Deep Space
Applications

• CCSDS Telemetry
• SCCC
• RS(255,223) GF(256)
• Block Interleaving
• Galileo (NASA) size2
• Giotto (ESA) size8
• RSC
• g11111001
• g21011011

6
Deep Space
Applications

• Satellite ATM
• Enhanced cell532 CRC

7
Deep Space
Applications

• Satellite Modems
• TCC
• TPC
• TPCRS
• Intelsat
• IDR/IBS
• ½
• ¾

0.5-1 dB better performance no interleaver,
no error-floor
8
Applications

• Deep Space
• Multimedia
• UMTS
• Information
• Other

9
Applications

• Multimedia

10
Multimedia
Applications

• DVB
• DVB-S Satellite
• DVB-C Cable
• DVB-T Terrestrial

• Outer
• RS(204,188) shortened from (255,239)
• A Size 12 Conv. Byte Interleaver
• Inner
• 64-state Conv. K7
• A bit interleaver

11
Multimedia
Applications

• Bluetooth
• Wireless Local Network
• Computer
• Cell phone
• Headset
• 2 Coding schemes
• Repetition Code rate 1/3
• Shortened Hamming (15,10)

• Bluetooth
• A rate 2/3 4-State Turbo code
• 8 Iterations on Rayligh Fading Channel
• 2 Types of Packets

12
Multimedia
Applications

• DAB
• CD Quality Radio-1996
• S-band, Shadowing, Multipath
• CCSDS Turbo Code
• Interleaver size 8920
• 3.2 dB AWGN Ch. Gain
• 4.5 dB Fading Ch. Gain

13
Multimedia
Applications

• Inmarsat
• Multimedia services of Inmarsat-3
• 64 Kb/s with a laptop sized terminal
• Turbo Coding 16-QAM Mod.
• Reduces BW req. up to 50
• Better satellite power efficiency

14
Applications

• Deep Space
• Multimedia
• UMTS
• Information
• Other

15
Applications

• UMTS

16
Applications
UMTS

• 3GPP(3rd gen. partnership proj.)
• An ITU Standard for IMT-2000
• PCCC Encoder
• K4 conv. Code
• RSC
• Fwd 15
• Fdk 13

17
Applications
UMTS

• Interleaver
• 5,10 or 20 row
• 8-256 column
• Decoder
• RSC
• Log-MAP
• Simulation Results
• 640 input-bits, 10 iter.
• 5114 bits, 14 iter.

18
Applications

• Deep Space
• Multimedia
• UMTS
• Information
• Other

19
Applications

• Information

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Information
Applications

• Inf. Embedding in Images
• Compressed Images Protection
• Digital Signature

• PCCC Encoder
• 2 rate ½ conv. Code

• Decoding Algorithm
• Log-MAP

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Information
Applications

• Performance

22
Information
Applications

• Inf. Hiding Application
• Rate 1/9 SCCC
• RS(16,5) PC
• 1 error Hamming
• Source Coding
• Using Turbo Coding Scheme
• Uniform and Non-Uniform
• Up to 0.22 bit/symbol performance in highly
  non-uniform sources

23
Applications

• Deep Space
• Multimedia
• UMTS
• Information
• Other

24
Applications

• Other

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Other
Applications

• ADSL
• 1dB better performance than multidimensional
  TCMViterbi
• 16-state RSC puncture
• 4-state RSC instead with an only 0.2 dB loss in
  performance

• MAP Algorithm 10 iterations

26
Other
Applications

• Magnetic Recording Channels
• PR4 protocols
• High rate Turbo Codes
• Gain in versus Uncoded
• Rate 7.1dB
• Rate 6.5dB

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Other
Applications

• OCDMA
• Features
• Nearly perfect power control
• Fixed user position
• High SNR and Bit rates
• Shortcomings
• Technical issues
• Digital logic and Signal processing in Optical
  domain
• Limited No. of supported users

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Other
Applications

• Typical performance 1e-9
• Uncoded 10-20 users
• SCCC
• Rate ½ 16-state conv. Code
• gives
• RS(255,239) from GF(256)
• Improves to
• Proposed OCDMA System
• Performance

29
Thank You
Turbo Coding Applications