The algorithm adopts a series of skills, which are composed of prediction of initial search point, effective half-stop criteria, adaptive search pattern and auxiliary search points.

Combined with the characteristic of the advancing front s average energy when the curve evolving,the stop criterion of Fast Marching method was redefined.

Based on the optimal decoding algorithm and basic principle of iterative decoding for turbo code, the stop criterion for the iterative decoding is deduced under the condition of cross entropy minimization and iteration convergence.

Analysis of stop criterions in the decoder of parallel concatenated LDPC codes;

The implemented stop criterion is based on backward error analysis.

Compared to other classical stopping criterions,the new method can reduce average number of iterations and accelerate turbo decoding under the same bit-error-ratio (BER) performance,and it can be applie.

In addition, according to the statistical speciality of the branch decoder output information,using the mean absolute value of extrinsic information as the stopping criterion in iteration can reduce decoding calculation delay,for the average iteration number is lessened availably.

Combined with several pre-stop principles, the algorithm can improve the searching speed on the promise of enough matching precision.

Two classes of double parameter stopping rules,[N,c]and[R,d],are suggested and studied incontinuous sampling plans.

By introducing the measure of average delayed time, the stopping‘velocity’ are compared among four kinds of differental stopping rules, including rule,,and,each of them can be adopted as a part of operating program in continuous sampling plans.