1. A method for reducing memory access when receiving a signal by a physical electronic signal receiving apparatus in a communication system supporting a low density parity check (LDPC) code, the physical electronic signal receiving apparatus including a receiver, a processor, a low power LDPC decoder, and a plurality of non-transitory computer readable recordable memories, the processor being configured to control the receiver, the low power LDPC decoder and the plurality of non-transitory computer readable recordable memories, the method comprising:receiving, via the receiver, a signal; and

performing, via the low power LDPC decoder, an LDPC decoding operation for the received signal,

wherein performing, via the low power LDPC decoder, the LDPC decoding operation comprises:

detecting, via the low power LDPC decoder, non-zero matrices among M x N sub-matrices included in a first parity check matrix;

generating, via the low power LDPC decoder, a second parity check matrix including the non-zero matrices;

grouping, via the low power LDPC decoder, the non-zero matrices into a plurality of groups, each of the plurality of groups including a preset number of non-zero matrices included in each block column of the first parity check matrix;

storing, via the low power LDPC decoder, the plurality of groups to the plurality of non-transitory computer readable recordable memories in the physical electronic signal receiving apparatus, respectively, a number of regions included in each of the plurality of non-transitory computer readable recordable memories being equal to a number of non-zero matrices included in a corresponding group of the plurality of groups;

updating, via the low power LDPC decoder, check node to variable node messages (check-to-variable messages) corresponding to at least one nonzero matrix having a same block column stored in each of the plurality of non-transitory computer readable recordable memories; and

simultaneously updating, via the low power LDPC decoder, variable node to check node messages (variable-to-check messages) using the updated check-to-variable messages.