In this paper, we propose a Sparse Code Spreading-aided Multi-Carrier Differential Chaos Shift Keying (SCS-MC-DCSK) transceiver to improve the efficiency and reliability performances for multiuser transmissions. With the aim to improve the spectrum efficiency and enhance the reliability, we construct a multi-dimension codebook based on a factor graph matrix to spread information bits in a non orthogonal way, thus the signals could overlap and multiple users are allowed to share all sub-carrier resources via the non orthogonal spreading. The information bits using the same codebook are regarded as a layer, while each user could choose to use one or multiple layers. Then the resultant symbols are spread by the reference chaotic sequence and its quadrature version generated by Hilbert transform in the time domain. At the receiver, reverse operations are conducted, and we propose the Minimum Distance (MD) detection method to retrieve the estimates. Furthermore, theoretical performances, including the Symbol Error Rate (SER), capacity, energy efficiency, spectrum efficiency and computational complexity, are analyzed and compared among the proposed design and benchmarks. Simulation results are then provided to validate the theoretical analysis. Moreover, the Bit Error Rate (BER) performances under different channel conditions demonstrate the superior reliability and efficiency to benchmarks.

中文翻译：

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可靠且高效的稀疏代码扩展辅助MC-DCSK收发器设计，用于多用户传输

在本文中，我们提出了一种稀疏代码扩展辅助的多载波差分混沌键控（SCS-MC-DCSK）收发器，以提高多用户传输的效率和可靠性。为了提高频谱效率和可靠性，我们构建了一个基于因子图矩阵的多维码本，以非正交的方式扩展信息比特，从而使信号可以重叠，允许多个用户共享所有子信号。 -通过非正交扩展的载波资源。使用同一密码本的信息位被视为一层，而每个用户可以选择使用一层或多层。然后，所得符号通过参考混沌序列进行扩展，并在时域中通过希尔伯特变换生成其正交形式。在接收方，进行反向操作，我们提出了最小距离（MD）检测方法来检索估计值。此外，在拟议的设计和基准之间对理论性能进行了分析和比较，包括符号错误率（SER），容量，能效，频谱效率和计算复杂性。然后提供仿真结果以验证理论分析。此外，在不同信道条件下的误码率（BER）性能证明了基准性能优异。在提议的设计和基准之间进行分析和比较。然后提供仿真结果以验证理论分析。此外，在不同信道条件下的误码率（BER）性能证明了基准性能优异。在提议的设计和基准之间进行分析和比较。然后提供仿真结果以验证理论分析。此外，在不同信道条件下的误码率（BER）性能证明了基准性能优异。