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

Abstract

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.