Abstract:

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.

Key words: ultra-wideband, frequency adaptive detect and avoid, Gaussian 7-th derivative pulse, Tent chaotic sequence, chaotic spread spectrum-carrier modulation, interference suppression