I-HPO-CDSK: An improved chaotic communication scheme for high reliability and effectivity

Abstract

By transmitting 2-bits orthogonal information signal in parallel, compared with phase-orthogonality CDSK (PO-CDSK), high-data-rate PO-CDSK (HPO-CDSK) has double spectral efficiency. Unfortunately, the additional information will cause more noise interference during correlation detection in HPO-CDSK. The study of HPO-CDSK is extended and improved HPO-CDSK (I-HPO-CDSK) is proposed to obtain high reliability and effectiveness. By virtue of the theorem that the integral of the sine and cosine functions in a period is 0, in I-HPO-CDSK, 3-bits information can be transmitted in parallel and will not cause ISI components. Moreover, compared with HPO-CDSK, I-HPO-CDSK can decrease noise interference. Results show that, due to less interference and 3-bits information transmitting in parallel, I-HPO-CDSK has better BER performance and spectral efficiency than those of previous chaotic communication schemes, such as PO-CDSK and HPO-CDSK.