混沌超宽带频率自适应DAA设计

为了解决超宽带(UWB)与现有窄带无线通信系统干扰问题,采用高斯7阶导脉冲作为UWB原始脉冲,使用Tent混沌序列作为扩频序列码,提出混沌扩频-载波调制算法,设计了一种混沌超宽带频率自适应检测避让(DAA)方案,可以保证稳定的UWB正常发射功率,具有较高的传输效率,能进行无间断通信. 仿真结果表明,产生的自适应陷波脉冲能够实现任意频段陷波,直接序列扩频系统中采用Tent混沌序列扩频码的误码率性能明显优于传统伪随机序列扩频码,具有灵活的窄带干扰抑制能力.

Chaotic Ultra-Wideband Frequency Adaptive DAA Design

A chaotic ultra-wideband (UWB) frequency adaptive detect and avoid (DAA) design method based on chaotic spread spectrum-carrier modulation is proposed for narrow band interference suppression. Furthermore, Gaussian 7-th derivative pulse is considered as UWB original pulse and Tent chaotic sequence is acted as spread spectrum sequence. Simulation shows that the proposed DAA method can provide stable UWB normal transmit power, and have high transmission efficiency and make uninterrupted communications. Moreover, the adaptive notch pulse can produce arbitrary spectral notches and have flexible anti-interference ability, the Tent chaotic sequence is proved to have stronger byte error rate performance than that of the traditional pseudo noise sequence in the direct sequence spread spectrum system.