Design and Performance Analysis of a Novel Trellis-Coded Differential Chaotic Modulation System

本文提出了一种新型的编码调制技术——网格编码差分混沌调制技术（TC-DCM:Trellis-CodedDifferentialChaoticModulation），其主要的思想是将网格编码调制技术（TCM:Trellis-CodedModulation）和以混沌信号为载波的多元差分混沌移位键控调制技术（M-DCSK:M-aryDifferentialChaoticShiftKeying）相结合。由于混沌信号具有类噪声的内在的扩频特性，在调制的同时直接对信号进行扩频，利用其良好的相关特性和连续带宽的功率谱特性，该系统具有较好的抗多径干扰的能力，弥补了传统的网格编码调制系统在这方面的不足。此外，由...In this paper, a novel coded modulation scheme named Trellis-Coded Differential Chaotic Modulation (TC-DCM) is proposed, which combines trellis codes with M-ary Differential Chaotic Shift Keying (M-DCSK). The new scheme not only reduces the multipath interference efficiently due to its inherent spreading property, but also avoids the use of Channel State Information (CSI), making the corresponding...学位：工学硕士院系专业：信息科学与技术学院_通信与信息系统学号：2332014115322

Multiple Access Chua Chaotic Communication system using Real Orthogonal Matrix Approach

An alternative to traditional Pseudo-Noise (PN)-Sequences, one-dimension (1D) orthogonal chaotic map sequences, and three dimensional (3D) continuous chaotic systems (x,y,z) are generated by orthonormal Gram-Schmidt process. A new Orthogonal Chua Chaotic Sequences OCCSs-based Direct-Sequence/Spread-Spectrum-Code Division Multiple Access (DS/SS-CDMA) system is proposed. The proposed system combines the 3D Chua chaotic system with Real Orthogonal Matrix Approach (ROMA). Comparing to previous sequences, the OCCSs inherit all beneficial features of Chua's Circuit and ROMA scheme, such as the best correlation properties, higher capacity, Low Probability Interception (LPI), reliable security and good orthogonality. The three analytical Bit Error Rates (BERs) expressions for each orthogonal sequence (̂,̂,̂) of OCCSs with three fingers Rake receiver under three-path Rayleigh fading channel with their spreading delays are derived. The correlation properties, capacity, randomness and security of OCCSs are evaluated. The simulations results show that the overall BERs performances, capacity, and security of proposed (̂,̂) of OCCSs-based DS/SS-CDMA system outperform classical PN , 1D Logistic Map sequences and sequences of 3D Chua’s circuit generated by orthonormal Gram-Schmidt process. The results also showed that at BER 10-4 for single and multi-user transmissions, the proposed OCCSs(̂) has achieved gains of 5 and 4 dB respectively in signal-to-noise (SNR) over traditional DS/SS-CDMA based on other sequences in Rayleigh fading channel