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A CLASS OF LDPC CODE'S CONSTRUCTION BASED ON AN ITERATIVE RANDOM METHOD

This letter gives a random construction for Low Density Parity Check (LDPC) codes, which uses an iterative algorithm to avoid short cycles in the Tanner graph. The construction method has great flexible choice in LDPC code's parameters including codelength, code rate, the least girth of the graph, the weight of column and row in the parity check matrix. The method can be applied to the irregular LDPC codes and strict regular LDPC codes. Systemic codes have many applications in digital communication, so this letter proposes a construction of the generator matrix of systemic LDPC codes from the parity check matrix. Simulations show that the method performs well with iterative decoding.

基于软气动执行器的一种新的迟滞补偿模糊动态控制策略

提出了一种新颖的模糊串级控制策略,用于控制波纹管式软气动执行器的动态特性。首先,采用系统辨识方法对软气动执行器进行数学建模。然后,提出了Prandtl-Ishlinskii(P-I)方法来表征复杂的滞后特性。在P-I模型中,使用粒子群优化(PSO)方法识别和推导参数。随后,构建逆P-I模型并将其置于前馈路径中以补偿滞后效应。为了增强系统的适应性,设计了模糊PID控制器,并将其集成到串级策略中,以精确控制软体执行器。跟踪结果的比较进一步表明,设计的模糊PID控制器比传统PID控制器具有更好的控制性能。