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学者姓名：蔡相明
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Abstract ：
In this letter, we propose a reconfigurable intelligent surface (RIS)-aided dual M-ary differential chaos shift keying (RIS-DM-DCSK) system for non-coherent chaotic communications. In RIS-DM-DCSK, a dual M-ary DCSK signal is designed to transmit twice the number of modulated bits compared to a standard M-ary DCSK signal while permutation index modulation is employed to convey additional index bits, thereby enhancing energy efficiency. Furthermore, we propose a permutation index detection and dual M-ary DCSK demodulation algorithm to recover the transmitted bits. The bit error probability (BEP) of RIS-DM-DCSK is analyzed over a Rayleigh fading channel. Numerical results show that the proposed RIS-DM-DCSK achieves superior bit error rate (BER) performance and energy efficiency compared to benchmark schemes.
Keyword ：
Bit error rate Bit error rate Channel estimation Channel estimation Chaotic communication Chaotic communication Complexity theory Complexity theory Correlation Correlation Demodulation Demodulation dual M-ary differential chaos shift keying dual M-ary differential chaos shift keying Indexes Indexes Modulation Modulation Non-coherent communications Non-coherent communications permutation index modulation permutation index modulation reconfigurable intelligent surface reconfigurable intelligent surface Standards Standards Symbols Symbols
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| GB/T 7714 | Cai, Xiangming , Xu, Weikai , Wang, Lin et al. Toward Non-Coherent Chaotic Communications: An RIS-Aided Dual M-ary DCSK System [J]. | IEEE COMMUNICATIONS LETTERS , 2025 , 29 (3) : 472-476 . |
| MLA | Cai, Xiangming et al. "Toward Non-Coherent Chaotic Communications: An RIS-Aided Dual M-ary DCSK System" . | IEEE COMMUNICATIONS LETTERS 29 . 3 (2025) : 472-476 . |
| APA | Cai, Xiangming , Xu, Weikai , Wang, Lin , Yuen, Chau . Toward Non-Coherent Chaotic Communications: An RIS-Aided Dual M-ary DCSK System . | IEEE COMMUNICATIONS LETTERS , 2025 , 29 (3) , 472-476 . |
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Abstract ：
Non-coherent chaotic communication has gained increasing attention as it provides an efficient solution for reliable communications without requiring channel state information. In this paper, we propose a non-coherent reconfigurable intelligent surface (RIS)-empowered differential chaos shift keying scheme with two-level nested index modulation (RIS-DCSK-TLNIM). In the proposed RIS-DCSK-TLNIM scheme, the reference index and information index are nested to form two-level nested index modulation. This design enhances both the spectral efficiency and bit error rate (BER) performance of RIS-DCSK-TLNIM, albeit at the expense of slightly increased complexity. Furthermore, we propose a joint detection algorithm to recover the information bits transmitted via the reference index, information index, and two distinct-mode signals. We then extend RIS-DCSK-TLNIM into an enhanced system to achieve higher spectral efficiency. Subsequently, we analyze the BER performance, spectral efficiency, and system complexity of RIS-DCSK-TLNIM, and compare these metrics with those of benchmark systems. Comparison results demonstrate that the proposed RIS-DCSK-TLNIM, when configured with a small number of time slots, can achieve more than twice the spectral efficiency and at least a 6 dB gain in BER performance compared to benchmark systems.
Keyword ：
Bit error rate Bit error rate Chaotic communication Chaotic communication Complexity theory Complexity theory Detection algorithms Detection algorithms differential chaos shift keying (DCSK) differential chaos shift keying (DCSK) Electronic mail Electronic mail Indexes Indexes Modulation Modulation Non-coherent chaotic communication Non-coherent chaotic communication Receiving antennas Receiving antennas reconfigurable intelligent surface (RIS) reconfigurable intelligent surface (RIS) Symbols Symbols two-level nested index modulation (TLNIM) two-level nested index modulation (TLNIM) Wireless communication Wireless communication
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| GB/T 7714 | Cai, Xiangming , Huang, Chongwen , Chen, Pingping et al. Design of Non-Coherent RIS-Empowered DCSK With Two-Level Nested Index Modulation [J]. | IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS , 2025 , 24 (4) : 3044-3058 . |
| MLA | Cai, Xiangming et al. "Design of Non-Coherent RIS-Empowered DCSK With Two-Level Nested Index Modulation" . | IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 24 . 4 (2025) : 3044-3058 . |
| APA | Cai, Xiangming , Huang, Chongwen , Chen, Pingping , Basar, Ertugrul , Yuen, Chau . Design of Non-Coherent RIS-Empowered DCSK With Two-Level Nested Index Modulation . | IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS , 2025 , 24 (4) , 3044-3058 . |
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Abstract ：
Reconfigurable intelligent surface (RIS)-aided spatial modulation (RIS-SM) and its variants utilize the indices of receiver antennas and RIS grouping to transmit additional information bits, with the limited performance for large inactivated RIS elements. To address this issue, we propose to exploit an activation mode index for RIS-SM (AMI-RIS-SM), where the RIS can operate in different activation modes during various time slots. In this way, its activation mode index, coupled with the receiver antenna index, can transmit more information bits. Furthermore, we propose maximum likelihood (ML) and low-complexity pre-greedy ML detections to recover the transmitted bits. We then derive the bit error rate (BER) performance of the proposed AMI-RIS-SM. The analytical and consistent simulation results show that the proposed scheme can achieve significant performance of up to a 4 dB gain over its counterparts.
Keyword ：
activation mode index activation mode index Bit error rate Bit error rate Indexes Indexes Modulation Modulation pre-greedy maximum likelihood detection pre-greedy maximum likelihood detection Receiving antennas Receiving antennas Reconfigurable intelligent surface Reconfigurable intelligent surface Slot antennas Slot antennas Symbols Symbols Transmitting antennas Transmitting antennas
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| GB/T 7714 | Li, Can , Cai, Xiangming , Kang, Peng et al. Exploiting Activation Mode Index for Reconfigurable Intelligent Surface-Aided Spatial Modulation [J]. | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY , 2024 , 73 (12) : 19809-19814 . |
| MLA | Li, Can et al. "Exploiting Activation Mode Index for Reconfigurable Intelligent Surface-Aided Spatial Modulation" . | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 73 . 12 (2024) : 19809-19814 . |
| APA | Li, Can , Cai, Xiangming , Kang, Peng , Chen, Pingping . Exploiting Activation Mode Index for Reconfigurable Intelligent Surface-Aided Spatial Modulation . | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY , 2024 , 73 (12) , 19809-19814 . |
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Abstract ：
In this paper, a quadruple code index modulation (QCIM) technique is proposed for low-complexity and spectral-efficient wireless transmission. The proposed QCIM scheme utilizes quadruple code indices in addition to M-ary phase shift keying symbols to transmit more information bits compared to conventional code index modulation (CIM) schemes. To recover the transmitted information bits, we propose maximum likelihood detection (MLD) and greedy detection (GD) algorithms for the proposed QCIM, with the GD algorithm offering almost the same bit error rate (BER) performance to the MLD algorithm but with significantly lower system complexity. Additionally, we extend QCIM into a reconfigurable intelligent surface (RIS)-assisted QCIM (RIS-QCIM) system, which significantly enhances BER performance and eliminates the need for channel state information at the receiver. Numerical results demonstrate that the proposed QCIM and RIS-QCIM achieve higher spectral efficiency and superior BER performance in contrast to benchmark schemes. © 2015 IEEE.
Keyword ：
greedy detection greedy detection performance analysis performance analysis Quadruple code index modulation Quadruple code index modulation spectral efficiency spectral efficiency
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| GB/T 7714 | Cai, X. , Xie, Z. , Chen, P. et al. Quadruple Code Index Modulation [J]. | IEEE Transactions on Cognitive Communications and Networking , 2024 . |
| MLA | Cai, X. et al. "Quadruple Code Index Modulation" . | IEEE Transactions on Cognitive Communications and Networking (2024) . |
| APA | Cai, X. , Xie, Z. , Chen, P. , Fang, Y. , Basar, E. , Yuen, C. . Quadruple Code Index Modulation . | IEEE Transactions on Cognitive Communications and Networking , 2024 . |
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