Interleaver Design Method for Turbo Codes Based on Genetic Algorithm

This paper describes a new interleaver construction technique for turbo code. The technique searches as much as possible pseudo-random interleaving patterns under a certain condition using genetic algorithms(GAs). The new interleavers have the superiority of the S-random interleavers and this interleaver construction technique can reduce the time taken to generate pseudo-random interleaving patterns under a certain condition. The results obtained indicate that the new interleavers yield an equal to or better performance than the S-random interleavers. Compared to the S-random interleaver, this design requires a lower level of computational complexity. Key words interleaver - Turbo codes - genetic algorithm CLC number TN 911. 22 Foundation item: Supported by the National Natural Science Foundation of China (60372057) and the Key Open Laboratory on Information Science and Engineering of Railway Transportation Ministry of Beijing Jiaotong University of China (KLISAE-0103)Biography: Tan Ying (1963-), female, Associate professor, Ph. D, research direction: error control coding, analysis and design of wireless communication system.

穴位埋线对特应性皮炎患者辅助性T淋巴细胞的影响

目的探讨穴位埋线对特应性皮炎患者辅助性T淋巴细胞的影响。方法90例特应性皮炎患者,随机分为观察组和对照组,各45例。对照组采用盐酸左西替利嗪治疗,观察组采用穴位埋线治疗。比较两组患者疾病改善情况、不良反应发生情况及治疗前后干扰素-γ(IFN-γ)、肿瘤坏死因子-α(TNF-α)、白细胞介素(IL)-4、IL-2及IL-5水平。结果观察组疾病改善情况优于对照组,差异有统计学意义(P<0.05)。治疗前,两组IFN-γ、TNF-α、IL-4、IL-2及IL-5水平比较差异无统计学意义(P>0.05);治疗后,观察组IFN-γ、TNF-α、IL-4、IL-2及IL-5分别为(15.31±5.23)、(5.21±1.15)、(12.01±5.11)、(46.13±6.02)、(19.92±4.84)pg/ml,对照组分别为(12.89±5.53)、(4.72±1.12)、(14.24±5.13)、(43.25±6.52)、(23.21±3.21)pg/ml,比较差异有统计学意义(P<0.05)。结论穴位埋线对特应性皮炎患者辅助性T淋巴细胞的影响较大,可有效改善病情和改善Th1、Th2淋巴细胞,值得推广应用。