交织多址接入系统定点Logistic交织序列生成算法  

Fixed-point Logistic interleaving sequence generationalgorithm for interleave division multiple access system

作　　者：付仕明[1] 陈畅霖 吴广富[2] 向碧群 FU Shiming;CHEN Changlin;WU Guangfu;XIANG Biqun(School of Artificial Intelligence,Chongqing University of Education,Chongqing 400065,P.R.China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;School of Big Data&Computer Science Engineering,Chongqing College of Mobile Communication,Chongqing 401520,P.R.China)

机构地区：[1]重庆第二师范学院人工智能学院,重庆400065 [2]重庆邮电大学通信与信息工程学院,重庆400065 [3]重庆移通学院大数据与计算机科学学院,重庆401520

出　　处：《重庆邮电大学学报（自然科学版）》2023年第3期459-467,共9页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(62071077);重庆市教育委员会科学技术研究计划项目(KJZD-K202202402,KJQN202201630,KJQN201800642)。

摘　　要：交织多址接入(interleave division multiple access,IDMA)技术作为典型的非正交多址接入技术,受到学术界和产业界的广泛关注。为降低IDMA系统多用户检测过程存储空间和计算复杂度,采用双极性化的定点Logistic序列与待(解)交织序列对应相乘方式完成(解)交织;同时,为降低任意量化比特长度的定点Logistic序列生成过程时延,采用现场可编程逻辑门阵列进行生成。利用Logistic系统李雅普诺夫指数,确定处于混沌状态的定点Logistic序列量化比特长度;基于平衡度和互相关门限,确定定点Logistic序列开始位置和初值;采用查表法构建非对称基本乘法器,并采用移位相加法计算总乘法器。仿真结果表明,所提算法可以充分利用Logistic序列混沌、平衡度、相关等特性,具有较好的误码率性能。Interleave division multiple access(IDMA)technology,as a typical non-orthogonal multiple access technology,has been widely concerned by academia and industry.In order to reduce storage space and computational complexity of the multi-user detection process of the IDMA system,a dual-polarized fixed-point Logistic sequence is multiplied with the corresponding(de-)interleaving sequence to complete the(de-)interleaving.In order to reduce the time delay in the fixed-point Logistic sequence generation process with arbitrary quantization bit accuracy,a field programmable gate array(FPGA)is used for sequence generation.Firstly,the quantization bit length of the fixed-point Logistic sequence in a chaotic state is determined by using the Lyapunov exponent of the Logistic system;then the initial value and start position of the fixed-point Logistic sequence are determined based on the equilibrium degree and cross correlation threshold;finally,the non-symmetric basic multiplier is constructed by the table look-up(LUT)method,and the total multiplier is calculated by the shift-addition method.Simulation results show that the proposed algorithm can sufficiently use the chaos,equilibrium and correlation properties of Logistic sequences and has a good bit error rate(BER)performance.

关 键 词：交织多址接入(IDMA) 交织器 Logistic交织序列 定点乘法器 

分 类 号：TN929.5[电子电信—通信与信息系统]