基于块编码的功率谱可控复合序列  

Controllable composite sequence of power spectral density based on the block coded signal

作　　者：郭黎利[1] 刘湘蒲[1,2] 付江志[1] 李清伟[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]电子信息控制重点实验室,四川成都610036

出　　处：《哈尔滨工程大学学报》2015年第2期248-251,256,共5页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(61271263)

摘　　要：为了研究功率谱凹陷的复合序列,实现直扩认知用户频谱接入通信,提出了将块编码码字与伪随机序列进行复合的序列产生方法。该方法通过设计块编码的码字及码字符号时间间隔,控制复合序列功率谱的凹陷位置。通过对复合序列功率谱密度表达式的推导及仿真实验验证了复合方式的可行性及功率谱的可控性。将该复合方式应用于直扩认知用户,建立了直扩认知用户通信系统模型。实验结果表明,在不影响授权用户通信性能的前提下,采用所设计复合序列的直扩认知用户能够有效的实现频谱接入通信。In order to research composite sequences that their power spectral densities have nulls, which can be used to realize spectrum access communication for direct sequence spread spectrum secondary users, this paper compounded pseudo random sequences with codeword of block coded signal. It is flexible to control the position of nulls by designing codeword and their time intervals. Power spectral density expression of composite sequence and simulation results verify the feasibility of compositing mode and the controllability of power spectral density. By introducing composite sequences to the direct sequence spread spectrum secondary users, a communication system for direct sequence spread spectrum secondary users was established. Simulation results verified that the direct sequence spread spectrum secondary users with composite sequences realize spectrum access communication without influencing primary users.

关 键 词：直扩认知用户 复合序列 块编码 功率谱 可控 

分 类 号：TN914.42[电子电信—通信与信息系统]