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Analytical Evaluation of a Hybrid Chaotic Shift Keying [CS-QCSK] in a CDMA System

International Journal of Computer Applications
© 2012 by IJCA Journal
Volume 54 - Number 15
Year of Publication: 2012
K. Thilagam
K. Jayanthi

K Thilagam and K Jayanthi. Article: Analytical Evaluation of a Hybrid Chaotic Shift Keying [CS-QCSK] in a CDMA System. International Journal of Computer Applications 54(15):38-43, September 2012. Full text available. BibTeX

	author = {K. Thilagam and K. Jayanthi},
	title = {Article: Analytical Evaluation of a Hybrid Chaotic Shift Keying [CS-QCSK] in a CDMA System},
	journal = {International Journal of Computer Applications},
	year = {2012},
	volume = {54},
	number = {15},
	pages = {38-43},
	month = {September},
	note = {Full text available}


In recent years, various chaos based modulation schemes were evolved, of which the CS-DCSK modulation technique provides a better BER performance and bandwidth efficiency, due to its code domain approach[10]. The QCSK modulation technique provides double benefit, namely: higher data rate with similar BER performance and same bandwidth occupation as DCSK. By combining the advantage of code shifted differential chaos shift keying (CS-DCSK) and Quadrature chaos shift keying (QCSK) scheme, a novel CS-QCSK modulation scheme called code shifted Quadrature chaos shift keying is proposed. The noise performance of CS-QCSK is better to most conventional modulation schemes and also provides an increased data transmission rates with greatly improved robustness. Analytical expressions for the bit-error rates are derived for both AWGN channel and Rayleigh multipath fading channel. The simulation result shows that the proposed method outperforms the classical approaches in terms of bit error rate and spectral efficiency.


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