Orthogonal Chaotic Binary Sequences Based on Bernoulli Map and Walsh Functions

The statistical properties of chaotic binary sequences generated by the Bernoulli map and Walsh functions are discussed. The Walsh functions are based on a 2 k × 2 k Hadamard matrix. For general k (= 1 , 2 , ⋯ ), we will prove that 2 k - 1 Walsh functions can generate essentially different balanced and i.i.d. binary sequences that are orthogonal to each other

Generation of chaos-based random bit sequences with prescribed auto-correlations by post-processing using linear feedback shift registers

Post-processing scheme using linear feedback shift registers (LFSRs) for generat-ing chaos-based random bit sequences with infinite period for use in Monte-Carlo methods isdiscussed. We theoretically analyze auto-correlation functions of choatic binary sequences gen-erated by the Bernoulli chaotic map and a class of binary funcitons. The theoretical analysescan be applied to the LFSR-based post-processing for generating random bit sequences withprescribed auto-correlations because LFSRs can be regarded as a finite bit approximation ofthe Bernoulli map. Some results of numerical experiments are also given.</p

カオス2値系列とその相関特性の評価に関する研究

1 緒論 2 スペクトル拡散通信と符号分割多元接続 3 カオスの拡散符号への応用 4 チェビシェフ2値系列の相関関数の厳密評価 5 有限周期カオス系列の統計量の揺らぎと高次相関関数 6 画像データのSS通信への応用 7 結論と今後の課題Made available in DSpace on 2012-07-10T07:27:00Z (GMT). No. of bitstreams: 1 tsuneda.pdf: 11003890 bytes, checksum: b389e550cdef3c5cea29547398113c2a (MD5) Previous issue date: 1995-03-27主1-参1システム情報_情報工学（？

Binary Spreading Sequences with Negative Auto-Correlation Based on Chaos Theory and Gold Sequences for Application to Asynchronous DS/CDMA Communications

Spreading sequences with appropriate negative auto-correlation can reduce average multiple access interference (MAI) in asynchronous DS/CDMA systems compared with the conventional Gold Sequences generated by linear feedback shift registers (LFSRs). We design spreading sequences with negative auto-correlation based on Gold sequences and the chaos theory for the Bernoulli map. By computer simulations, we evaluate BER performances of asynchronous DS/CDMA systems using the proposed sequences

Design and Experiments of a Novel Low-Ripple Cockcroft-Walton AC-to-DC Converter for a Coil-Coupled Passive RFID Tag

A low-ripple diode charge-pump type AC-DC converter based on the Cockcroft-Walton diode multiplier is proposed for coil-coupled passive IC tags in this paper. This circuit is developed as a power supply for passive RFID tags with smart functions such as heart rate detection and/or body temperature measurement. The proposed circuit converts wirelessly induced power to a low-ripple DC voltage suitable for a 13.56 MHz RFID tag. The proposed circuit topology and the principle of operation are explained and treated theoretically by using quasi-equivalent small-signal models. The proposed circuit was implemented on a PCB. And it was confirmed that the proposed circuit provides 3.3 V DC with a ripple of less than 20 mV when a 4 Vp-p sinusoidal input is applied. Under this condition, the maximum output power is about 310 µW. The measured results were in good agreement with theoretical and HSPICE simulation results