This paper proposes a novel spatial-modulated multicarrier sparse code-division multiple access (SM/MC-SCDMA) system for achieving massive connectivity in device-centric wireless communications. In our SM/MC-SCDMA system, the advantages of both MC signalling and SM are amalgamated to conceive a low-complexity transceiver. Sparse frequency-domain spreading is utilized to mitigate the peak-to-average power ratio (PAPR) of MC signalling, as well as to facilitate low-complexity detection using the message passing algorithm. We then analyze the single-user bit error rate performance of SM/MC-SCDMA systems communicating over frequency-selective fading channels. Furthermore, the performance of SM/MC-SCDMA systems is evaluated based on both Monte-Carlo simulations and analytical results. We demonstrate that our low-complexity SM/MC-SCDMA transceivers are capable of achieving near-maximum likelihood (ML) performance even when the normalized user-load is as high as two, hence constituting a variable solution to support massive connectivity in device-centric wireless systems.

中文翻译：

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空间调制多载波稀疏码分多址

本文提出了一种新颖的空间调制多载波稀疏码分多址 (SM/MC-SCDMA) 系统，用于在以设备为中心的无线通信中实现大规模连接。在我们的 SM/MC-SCDMA 系统中，将 MC 信令和 SM 的优点结合起来，构想出一个低复杂度的收发器。稀疏频域扩展用于减轻 MC 信令的峰均功率比 (PAPR)，以及使用消息传递算法促进低复杂度检测。然后我们分析了在频率选择性衰落信道上通信的 SM/MC-SCDMA 系统的单用户误码率性能。此外，SM/MC-SCDMA 系统的性能基于蒙特卡罗模拟和分析结果进行评估。