Low Complexity X-EMS Algorithms for Nonbinary LDPC Codes
Xiao Ma, Kai Zhang, Haiqiang Chen, Baoming Bai · IEEE Transactions on Communications · 2011
The extended min-sum (EMS) algorithm is redescribed as a reduced-search trellis algorithm (called M-EMS algorithm). Two variants of the M-EMS algorithm, called T-EMS algorithm and D-EMS algorithm, are presented. Simulation results show that, these three algorithms (referred to as X-EMS algorithms for convenience), combined with factor correction techniques, perform almost as well as the Q-ary sum-product algorithm (QSPA) but with a much lower complexity.