Unequal Error Protection Using Low-Density Parity-Check Codes
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Unequal Error Protection Using Low-Density Parity-Check Codes. Nazanin Rahnavard Georgia Institute of Technology School of Electrical and Computer Engineering, [email protected] 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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Unequal error protection using low density parity check codes

Unequal Error Protection Using Low-Density Parity-Check Codes

Nazanin Rahnavard

Georgia Institute of TechnologySchool of Electrical and Computer Engineering, [email protected]


Unequal error protection using low density parity check codes

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


Unequal error protection using low density parity check codes

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


Unequal error protection using low density parity check codes

LDPC Codes

c2

c1

c3

c4

c5

v1

v2

v3

v4

v5

v6

v7

v8

v9


Unequal error protection using low density parity check codes

Unequal Error Protection (UEP) LDPC Codes

  • Applications:

  • Networking

  • Transmitting an image

Intuition:

Larger variable node degrees provide more protections


Unequal error protection using low density parity check codes

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


Unequal error protection using low density parity check codes

Simulation Results

R(3,6)

LIB

MIB


Unequal error protection using low density parity check codes

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


Unequal error protection using low density parity check codes

Simulation Results


Unequal error protection using low density parity check codes

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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