Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (2): 46-50,59.doi: 10.3969/j.issn.1000-565X.2011.02.008

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

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)

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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