Samsung Electronics Co., Ltd.

Skhynix Inc.

Korea Advanced Institute of Science and Technology

In-Cheol Park

Jaehwan Jung

Yong-seok Yi

An operation method of a LPC decoder includes: initializing variable nodes of a Tanner graph representing a parity check matrix; performing a check node update to check nodes of the Tanner graph based on variable node values of the variable nodes; performing a variable node update when there are USC nodes among the updated check nodes as a result of the check node update; and repeating the performing of the check node update and the variable node update when there are USC nodes as the result of the check node update, wherein the performing of the variable node update includes: selecting among the variable nodes a predetermined number of variable nodes having a USC value greater than a threshold; and flipping the variable node values of the selected variable nodes, and wherein the USC value is a number of the USC nodes linked to one of the variable nodes.

LDPC decoder, semiconductor memory system and operating method thereof

A method and device for decoding a syntax element are provided. The method includes reading candidate context models which correspond to a syntax element to be decoded; determining a context index increment for the syntax element; selecting a candidate context model of the candidate context models according to the context index increment; and performing binary arithmetic decoding for the syntax element based on the selected candidate context model. The device includes a context model reservoir which reads and stores candidate context models corresponding to a syntax element to be decoded; an increment determining unit which determines a context index increment for the syntax element; a context model selection unit which selects a candidate context model of the candidate context models by using the context index increment; and a decoding unit which performs a binary arithmetic decoding operation for the syntax element based on the selected candidate context model.

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Daejeon, South Korea

In-Cheol Park