一種數(shù)字化混沌擴(kuò)頻序列發(fā)生器的設(shè)計
Design for a digital chaotic spreading sequence generator
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摘要: 該文給出了一種基于FPGA芯片的數(shù)字化分段線性混沌映射系統(tǒng)的設(shè)計方法,該方法利用了m序列的擾動來克服有限精度下混沌序列的短周期行為;對用 VHDL實現(xiàn)的分段線性混沌序列發(fā)生器進(jìn)行了門級仿真;將數(shù)字混沌序列的平衡性、相關(guān)性和線性復(fù)雜度等與實值混沌序列進(jìn)行了比較,結(jié)論為:數(shù)字混沌序列的平衡性略比實值混沌序列差;自相關(guān)特性略好;N=63,255時,互相關(guān)特性略好,而N=31,127時互相關(guān)特性略差;二者的線性復(fù)雜度相當(dāng),為分段線性映射系統(tǒng)應(yīng)用于擴(kuò)頻通信領(lǐng)域探索了一條途徑。Abstract: The design method is given for the digital piecewise linear mapping system based on FPGA chip. In this method, the perturbation of m-sequence is used to overcome the short period of chaotic sequence caused by the finite precision effect. The piecewise linear chaotic generator is realized by means of VHDL and the simulations are made. The balance, the correlation and the linear complexity are compared between digital chaotic sequence and analogue chaotic sequence. A road is explored to apply the piecewise linear mapping system to a practical spreading spectrum system.
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