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GLOBECOM
2008
IEEE

Lowering LDPC Error Floors by Postprocessing

8 years 9 months ago
Lowering LDPC Error Floors by Postprocessing
−A class of combinatorial structures, called absorbing sets, strongly influences the performance of low-density paritycheck (LDPC) decoders at low error rates. Past experiments have shown that a class of (8,8) absorbing sets determines the error floor performance of the (2048,1723) Reed-Solomon based LDPC code (RS-LDPC). A postprocessing approach is formulated to exploit the structure of the absorbing set by biasing the reliabilities of selected messages in a message-passing decoder. The approach converges quickly and can be efficiently implemented with minimal overhead. Hardware emulation of the decoder with postprocessing shows more than two orders of magnitude improvement in the very low bit error rate performance and errorfloor-free operation below a BER of 10-12 .
Zhengya Zhang, Lara Dolecek, Borivoje Nikolic, Ven
Added 29 May 2010
Updated 29 May 2010
Type Conference
Year 2008
Where GLOBECOM
Authors Zhengya Zhang, Lara Dolecek, Borivoje Nikolic, Venkat Anantharam, Martin J. Wainwright
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