Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 66, Issue 7, Pages 1257-1261Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2018.2880779
Keywords
Chaotic modulation; M-ary differential chaotic shift keying; multilevel code-shifted differential chaotic shift keying; bit-error-rate (BER)
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Funding
- National Natural Science Foundation of China [61671395, 61871337]
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The multilevel code-shifted differential-chaos-shift-keying system transmits multiple information-bearing chaotic signals together with a reference chaotic signal in the same transmission symbol duration by orthogonal code sequences of a Walsh matrix. In order to obtain higher bandwidth efficiency (BE), a multilevel code-shifted M-ary differential chaos shift keying (MCS-MDCSK) system is proposed in this brief. We derive the theoretical bit-error-rate (BER) formula for the proposed system over the additive white Gaussian noise channel and the multipath fading channel. Finally, numerical results verify our derivations and superiority of the MCS-MDCSK. The proposed system not only greatly boosts the BE, but also obtains better BER performance.
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