ICTACT Journal on Communication Technology

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Construction of Regular LDPC Like Codes Based on Full Rank Codes and Their Iterative Decoding Using a Parity Check Tree


Affiliations
1 Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, India
     

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Low density parity check (LDPC) codes are capacity-approaching codes, which means that practical constructions exist that allow the noise threshold to be set very close to the theoretical Shannon limit for a memory less channel. LDPC codes are finding increasing use in applications like LTE-Networks, digital television, high density data storage systems, deep space communication systems etc. Several algebraic and combinatorial methods are available for constructing LDPC codes. In this paper we discuss a novel low complexity algebraic method for constructing regular LDPC like codes derived from full rank codes. We demonstrate that by employing these codes over AWGN channels, coding gains in excess of 2dB over un-coded systems can be realized when soft iterative decoding using a parity check tree is employed.

Keywords

LDPC Codes, Full Rank Codes, Conjugacy Class, Transform Domain Components Parity Check Tree, Soft Iterative Decoding.
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  • Construction of Regular LDPC Like Codes Based on Full Rank Codes and Their Iterative Decoding Using a Parity Check Tree

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Authors

H. Prashantha Kumar
Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, India
U. Sripati
Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, India
K. Rajesh Shetty
Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, India

Abstract


Low density parity check (LDPC) codes are capacity-approaching codes, which means that practical constructions exist that allow the noise threshold to be set very close to the theoretical Shannon limit for a memory less channel. LDPC codes are finding increasing use in applications like LTE-Networks, digital television, high density data storage systems, deep space communication systems etc. Several algebraic and combinatorial methods are available for constructing LDPC codes. In this paper we discuss a novel low complexity algebraic method for constructing regular LDPC like codes derived from full rank codes. We demonstrate that by employing these codes over AWGN channels, coding gains in excess of 2dB over un-coded systems can be realized when soft iterative decoding using a parity check tree is employed.

Keywords


LDPC Codes, Full Rank Codes, Conjugacy Class, Transform Domain Components Parity Check Tree, Soft Iterative Decoding.