Chaos-Based Digital Communication Systems: Operating by F. C. M. Lau, C. K. Tse (auth.)
By F. C. M. Lau, C. K. Tse (auth.)
This ebook addresses the applying of chaos in communique platforms. An rising self-discipline, chaos-based verbal exchange has been a massive learn subject long ago 20 years. This publication makes a speciality of very important elements of the procedure operation, research, and function overview of chosen chaos-based verbal exchange platforms, e.g., chaos-shift-keying (CSK) and differential CSK (DCSK) platforms. The booklet is written for graduate point readership.
The major emphases are research strategies and function reviews. Chaos-based verbal exchange structures are spread-spectrum structures, and accordingly should still supply a number of entry and are anticipated to own anti-jamming functions. The functionality of the chaos-based electronic verbal exchange platforms below multi-user environments is studied intimately. This booklet presents thorough reviews of the anti-jamming services of chaos-based electronic verbal exchange platforms lower than single-tone jammers and pulsed-noise jammers. a close research of the level of mutual interference within the most likely functional occasion that chaos-based structures and standard platforms function in shared frequency bands can also be given. moreover, a few chosen learn subject matters are mentioned, e.g., detection tools, a number of entry thoughts, etc.
Being learn orientated, the ebook will locate curiosity between researchers, professors, graduate scholars, know-how builders, and R&D engineers in communications. regularly, readers will enjoy the particular exposition of research equipment and the thorough reviews of chaos-based structures. particularly, researchers who're new to the sector will speedy get conversant in the required analytical recommendations for learning chaos-based electronic conversation platforms, whereas skilled researchers will locate the numerous benchmark effects valuable for reference and extra study.
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Extra resources for Chaos-Based Digital Communication Systems: Operating Principles, Analysis Methods, and Performance Evaluation
The FM-DCSK scheme is basically the same as the DCSK scheme, with the chaotic basis signals generated from chaotic FM generators. The demodulator is the same as the DCSK demodulator. The histograms of the correlator output from an FM-DCSK demodulator are shown in Fig. 13. Note that at high SNR, the histogram shows two distinct outputs corresponding to the two symbols. 5 Other Modulation Schemes 31 ~"-----,-----,-----,----,-----,-----,-----,-----,-----,-----, 5000 4000 ;>, g 113000 I 2000 1000 0" -25 -2U -10 -15 o 5 15 -5 10 Value ofFM-DCSK correlator output under a high SNR 20 II 25 (a) 70,,-----,------,------,------,------,------,------,-----, 60 50 »40 g ~ 30 ~ 20 10 0' -80 1111 • • • -60 -20 --40 o 20 40 Value of FM-DCSK correlator output under a low SNR 60 80 (b) Fig.
The reproduced chaotic functions are then used to correlate with the received signal during the remainder of the bit duration. Then, the outputs of the correlators are sampled and compared. Consider the lth received symbol. 1) lTb (l-l)Tb+Ts r(t)c(t) dt. 2) The input to the threshold detector at this instant is y(ln) = 8(ln) - 6(lTb). 3) If y(ln) is positive, a "+1" is decoded for the lth symbol. Otherwise, a "-I" is decoded. To gain some insights into the demodulation process, the histograms of y(ITb) are helpful.
The CDSK demodulator is similar to the DCSK demodulator, except that the delay equals TD , as shown in Fig. 14 (b). Here, we note that due to the non-zero correlation between different chaotic segments, the uncertainty of the correlator output generally increases and the bit error performance degrades in comparison to the DCSK scheme. 4 Symmetric Chaos Shift Keying Symmetric chaos shift keying (SCSK) can be considered as a sub-class of antipodal chaos shift keying [Sushchik et al. (2000)]. 5 Other Modulation Schemes Chaos generator F 33 1 - - -•• set) +1 or -1 depending on the symbol being sent (a) r-----------------, ret)I I.