华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (2): 46-50,59.doi: 10.3969/j.issn.1000-565X.2011.02.008

• 电子、通信与自动控制 • 上一篇    下一篇

CUWB系统的正交自适应脉冲设计及性能分析

郭黎利 赵冰 姜晓斐   

  1. 哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001
  • 收稿日期:2010-04-28 修回日期:2010-09-06 出版日期:2011-02-25 发布日期:2011-01-02
  • 通信作者: 郭黎利(1955-),男,教授,博士生导师,主要从事现代通信系统理论与技术、通信信号处理技术研究 E-mail:guo-lili@ hrbeu.edu.cn
  • 作者简介:郭黎利(1955-),男,教授,博士生导师,主要从事现代通信系统理论与技术、通信信号处理技术研究
  • 基金资助:

    国家自然科学基金资助项目(60772129)

Orthogonal Adaptive Pulse Design and Performance Analysis of CUWB System

Guo Li-li  Zhao Bing  Jiang Xiao-fei   

  1. Harbin engineering university information and communication engineering institute, heilongjiang Harbin 150001
  • Received:2010-04-28 Revised:2010-09-06 Online:2011-02-25 Published:2011-01-02
  • Contact: 郭黎利(1955-),男,教授,博士生导师,主要从事现代通信系统理论与技术、通信信号处理技术研究 E-mail:guo-lili@ hrbeu.edu.cn
  • About author:郭黎利(1955-),男,教授,博士生导师,主要从事现代通信系统理论与技术、通信信号处理技术研究
  • Supported by:

    国家自然科学基金资助项目(60772129)

摘要: 为了避免认知超宽带系统对现有窄带授权通信系统造成的干扰,提高认知用户的频谱利用率,提出了一种正交多频带自适应脉冲设计方法.该方法首先将频带划分成若干个子带,根据信道特性生成自适应辐射掩蔽;然后利用有限项扁长椭球波函数来设计各子带脉冲;最后将各子带脉冲在时域上进行加权组合,并通过Gram-Schmidt正交变换生成一组可灵活切换频谱的正交自适应脉冲.仿真结果表明,在不影响授权用户的前提下,该脉冲可通过出让部分频带的方式继续占用空闲频带,降低了认知用户的中断率,提高了系统的频谱利用率.

关键词: 认知系统, 超宽带, 正交自适应脉冲, 多频带, 扁长椭球波函数, 正交化, 切换机制

Abstract:

In order to avoid the interference of cognitive ultra-wideband systems for the existing narrow-band autho-rized communications systems and improve the spectrum utilization efficiency of cognitive users,a design method of orthogonal multiband adaptive pulse is proposed.In this method,first,the band is divided into multiple subbands and the adaptive emission mask is generated according to channel characteristics.Then,the subband pulses are designed by using the finite prolate spheroidal wave function and are weightedly combined in the time domain.Finally,a group of orthogonal adaptive pulses with flexible handoff spectrum are produced via the Gram-Schmidt orthogonal transformation.Simulated results indicate that,without affecting the authorized users,the produced pulses reduce the termination probability of cognitive users and improve the spectrum utilization efficiency of the cognitive system through releasing the corresponding conflicted bands.

Key words: cognitive systems, ultra-wideband, orthogonal adaptive pulse, multiband, prolate spheroidal wave function, orthogonalization, handoff mechanism