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Unequal Error Protection Using Low-Density Parity-Check Codes

Unequal Error Protection Using Low-Density Parity-Check Codes. Nazanin Rahnavard Georgia Institute of Technology School of Electrical and Computer Engineering, {nazanin}@ece.gatech.edu. Outline. Background on error-control coding and low-density parity-check (LDPC) codes

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Unequal Error Protection Using Low-Density Parity-Check Codes

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  1. Unequal Error Protection Using Low-Density Parity-Check Codes Nazanin Rahnavard Georgia Institute of TechnologySchool of Electrical and Computer Engineering, {nazanin}@ece.gatech.edu

  2. Outline • Background on error-control coding and low-density parity-check (LDPC) codes • The need for unequal error protection (UEP) • Design of UEP-LDPC codes, Method I • Design of UEP-LDPC codes, Method II • Simulation results • Conclusion and future work

  3. Message bits Encoding Decoding Codeword bits c1 c2 c3 c4 Background on Error-Control Coding Noisy channel Graph representation c1+c2+c3=0 c2+c4=0

  4. LDPC Codes c2 c1 c3 c4 c5 v1 v2 v3 v4 v5 v6 v7 v8 v9

  5. Unequal Error Protection (UEP) LDPC Codes • Applications: • Networking • Transmitting an image Intuition: Larger variable node degrees provide more protections

  6. dc dm dl dp kl km m Design of UEP-LDPC Codes, Method I # of more important bits (MIB) # of less important bits (LIB) m

  7. Simulation Results R(3,6) LIB MIB

  8. Design of UEP-LDPC Codes, Method II MIB Encoder 1 Encoder 2 Transmission Channel LIB m1 Code 1 dc1 Code 2 dM1 dp11 m1 m2 kM kL dL dp2 dp12 dM2 dc2 m2

  9. Simulation Results

  10. Conclusion and Future Work • Two design methodologies for providing UEP property • were proposed. • Simulation results showed the efficiency of the proposed • method. • Method II improved the performance of MIB. • The extension to more than two levels of protection • will be investigated in future.

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