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ICC
2007
IEEE

Quantization Effects in Low-Density Parity-Check Decoders

13 years 10 months ago
Quantization Effects in Low-Density Parity-Check Decoders
−A class of combinatorial structures, called absorbing sets, strongly influences the performance of low-density paritycheck (LDPC) decoders. In particular, the quantization scheme strongly affects which absorbing sets dominate in the error-floor region. Absorbing sets may be characterized as weak or strong. They are a characteristic of the parity check matrix of a code. Conventional quantization schemes applied to a (2209,1978) array-based LDPC code can induce low-weight weak absorbing sets and, as a result, elevate the error floor. Adaptive quantization schemes alleviate the effects of weak absorbing sets, and, as a result, only the strong ones dominate the error floor of an optimized decoder implementation. Another benefit of an adaptive quantization scheme is that it performs well even in very few iterations.
Zhengya Zhang, Lara Dolecek, Martin J. Wainwright,
Added 02 Jun 2010
Updated 02 Jun 2010
Type Conference
Year 2007
Where ICC
Authors Zhengya Zhang, Lara Dolecek, Martin J. Wainwright, Venkat Anantharam, Borivoje Nikolic
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