In this brief, a new noncoherent chaos-based communication scheme, named high-efficiency differential chaos shift keying (DCSK) (HE-DCSK), is proposed. By recycling each reference sample in DCSK, 2 bits of data can be carried in one data-modulated sample sequence, which offers our scheme double bandwidth efficiency and nonrepeated transmitted signal less prone to interception in comparison to DCSK. The bit-error performance of the proposed scheme is studied analytically based on Gaussian approximation for discrete-time implementations. Simulations in additive-white-Gaussian-noise channel are performed and compared with DCSK and correlation delay shift keying (CDSK) schemes. Results show that the bit-error rate performance of HE-DCSK can always outperform CDSK and be even better than DCSK with typical spreading factors and at reasonable E b /N 0 levels.Index Terms-Chaos communications, correlation delay shift keying (CDSK), differential chaos shift keying (DCSK), noncoherent demodulation.
In this brief, a reference-modulated differential chaos shift keying (DCSK) (RM-DCSK) is proposed for reliable and high-data-rate chaotic communication with low cost. In this scheme, the chaotic wavelet sent in either the first or second slot of each frame not only carries one bit of data but also serves as the message bearer of the data bit transmitted in its following time slot. Without any extra cost in decoding complexity, RM-DCSK can achieve doubled attainable bit rate and improved communication security in comparison to DCSK. The bit error rate (BER) performance of this new scheme is derived based on Gaussian approximation. Moreover, relevant simulation results in the additive white Gaussian noise channel are also given and compared with those of correlation delay shift keying (CDSK), DCSK, frequency-modulated DCSK, and high-efficiency DCSK schemes, which shows that the BER performance of our system is always superior to that of CDSK and it can even outperform DCSK under certain E b /N 0 levels or with large spreading factors.Index Terms-Bit error rate (BER), chaos communications, differential chaos shift keying (DCSK), noncoherent detection, reference-modulated DCSK (RM-DCSK).
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