由于具有较强的信道适应能力和低功率密度通信能力，直扩通信方式有望成为认知无线电的物理层支撑技术。如何提高认知用户间和认知用户/授权用户间的共融通信能力，这是直扩认知通信系统急需解决的问题。具有频谱特征可控且满足"掩蔽模板"需求特征的扩频序列生成技术是有望成为解决这一问题的技术途径。因此，频谱可控扩频序列的生成理论与方法成为直扩认知通信的关键性技术问题。.本课题以适用于直扩认知通信场合的频谱可控复合序列生成理论与方法为研究对象，拟从理论和方法两个层面，重点研究（1）基于码型复合和波形成型联合设计的直扩认知信号生成方法、（2）二元伪随机序列/波形频谱特征映射理论、（3）基于二元伪随机序列/波形频谱特征映射理论的频谱特征可控通信波形生成的一般性方法。.通过以上的研究，探索适用于直扩认知通信场合的频谱可控复合序列生成的理论依据和解决方法，为直扩认知通信在认知通信场合的应用提供理论支撑和技术储备。

Due to the ability of channel adaptation and low power density communication, Direct-Sequence Spread-Spectrum is most likely to become the supporting technology for the physical layer of cognitive radio. The topic of improving communion communication ability, either between cognitive users or between cognitive user and authorized users, becomes imperative for DSSS cognitive communication system.One possible solution is Spreading sequence generation technology, which provides controllable spectrum characteristics and satisfies the demand of "template concealed".Therefore, theory and method of generating spreading sequence with controllable spectrum structures will be the key technical problem for DS/SS cognitive communication..This project is mainly focused on the conception and solution of generating Spectrum controllable Composite sequences which can be used in DSSS cognitive communication environment. Key research topic: (1) method of generating DSSS cognitive signals based on the co-design of "code type compound" and "waveform shaping"; (2) Mapping theory of binary pseudo stochastic sequence and waveform spectrum characteristics; (3) A general method of generating spectrum characteristics controllable waveform based on the mapping theory of binary pseudo stochastic sequence and waveform spectrum characteristics. .This topic regards theory and method of generating spreading sequence which controls spectrum structures as the research object, which is planned to be mainly studied from theoretical and methodological aspects, and they are as follows: (1) Method of generation of DS/SS cognitive signal based on co-design of code type compound and waveform shaping; (2) binary pseudo stochastic sequence/waveform spectrum characteristic mapping theory; (3) A general method of communication signal waveform whose spectrum characteristic could be controlled, based on binary pseudo stochastic sequence/ waveform spectrum characteristic mapping theory..Through researches mentioned above, we provide theoretical and technical support for implementation of DSSS cognitive communication technology, by exploring theoretical foundations and actual solutions of generating spectrum controllable composite sequences in DSSS cognitive communication environment.