Effect of the threshold offset on the performance of UEP LDPC codes

Author

Wakeel, Abdul ; Henkel, Werner ; Gao, Feng

Author_Institution

Jacobs Univ. Bremen, Bremen, Germany

fYear

2013

fDate

12-14 Aug. 2013

Firstpage

50

Lastpage

54

Abstract

This letter addresses the effect of threshold offset on the average performance and UEP capability of higher order constellation (HOC) unequal error protection low density parity check (UEP-LDPC) codes. We optimize the variable node degree distribution for an HOC UEP-LDPC code at a minimum threshold, with a fixed check node degree distribution and code rate. The average performance and the UEP capability of the ensemble code for a marginal offset in the threshold value were investigated. The simulation results show that the average performance and UEP capability can be enhanced by a slight offset in the threshold value. We looked into the connectivity between protection classes due to the threshold offset for a possible answer to the performance gain.

Keywords

block codes; linear codes; parity check codes; sparse matrices; HOC UEP-LDPC code; fixed check node degree distribution; higher order constellation; low density parity check; threshold offset effect; unequal error protection codes; variable node degree distribution; Bit error rate; Error correction codes; Modulation; Parity check codes; Signal to noise ratio; Vectors; ACE algorithm; LDPC; Unequal error protection; higher order constellation; parity-check matrix;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications in China (ICCC), 2013 IEEE/CIC International Conference on

Conference_Location

Xi´an

Type

conf

DOI

10.1109/ICCChina.2013.6671088

Filename

6671088