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In this paper, we propose a efficient shift index searching algorithm for design of the block LDPC codes. It is combined with the message-passing based cycle search algorithm and ACE algorithm. We can determine the shift indices by ordering of priority factors which are effect on the LDPC code performance. Using this algorithm, we can construct the LDPC codes with low complexity compare to trellis-based search algorithm and save the memory for storing the parity check matrix. ※   2013 ()      (NRF-2011-0029321) ※      IT     (NIPA-2014-H040114-1009) First Author : The department of Electrical and Electronic Engineering, Yonsei University, myungse@yonsei.ac.kr,  ° Corresponding Author : The department of Electrical and Electronic Engineering, Yonsei University, ks.kim@yonsei.ac.kr,  *  puco201@yonsei.ac.kr, bhko@yonsei.ac.kr,  **   srlee@mokpo.ac.kr,  :KICS2014-04-151, Received April 30, 2014; Revised August, 8, 2014; Accepted August 8, 2014 I.        ,        ,         .               . Gallager LDPC     [1] LDPC     The Journal of Korea Information and Communications Society '14-08 Vol.39C No.08 638  1.     Fig. 1. Example of the proposed search algorithm (bit error rate) (parallel processing)   (encoding)         .              DVB-S2     .                      . LDPC        .          LDPC    (Shannon limit)  .         (Tanner graph)          .    LDPC                    .      LDPC   (waterfall region)    ,        (connetivity) -(error-floor)    .    MCS(modulation and coding scheme)  (codeword)         .   (trellis)              -           (binary level)      .             (block level)           .   -       ACE                    .         ACE     -   LDPC     .  1)        2)   (Lifting)                 . II.   2.1         [7]     -  . ‘0’ ‘1’   (variable node)   (check node) (edge)    (message)                . [8]                            . [9]                      .    [5]  ACE           /                639  , ACE      .             .                 -          LDPC   .  1   ,              ACE  .  ACE      .      (1)         (degree) .    (lifting)       .          .      ,   ACE          3     . (i)       (ii)        (iii)    ACE      LDPC                   ,       ,      ACE     . 2.2                                   .

Tanner Graph Based Low Complexity Cycle Search Algorithm for Design of Block LDPC Codes