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