A method and apparatus for decoding spatially coupled LDPC code using sliding window

The invention discloses a method and a device for decoding a spatial coupling LDPC code by using a sliding window. The method comprises the following steps: acquiring a coupling chain of SC-LDPC; andinserting a second number of check nodes in front of the check node corresponding to each doping point, when a preset sliding window slides in the doping chain, determining the check node and the variable node which fall into the sliding window at the current time, and decoding a second decoding block which is behind the check node and is adjacent to the check node. By inserting additional check nodes, the coupling mode of the coupling chain is not changed by inserting the check nodes. According to the method, decoding is carried out on the decoding block after the check node is inserted again, so that the decoding block after the check node is inserted does not depend on the information of the previous decoding block, propagation of error information in the coupling chain can be limited,and the decoding accuracy