Title: Space-Time- and Frequency- Spreading for Interference Minimization in Dense IoT Show Chinese title

Title: 时空和频率扩展用于密集物联网中的干扰最小化

Abstract: In this article, we propose a space spreading-assisted framework that leverages either time or frequency diversity or both to reduce interference and signal loss owing to channel impairments and facilitate the efficient operation of large-scale dense Internet-of-Things (IoT). Our approach employs dispersion of data-streams transmitted from individual IoT devices over indexed space-time (ST), space-frequency (SF) or space-time-frequency (STF) blocks. As a result, no two devices transmit on the same block; only one is activated while the rest of the devices in the network is silent, thereby minimizing possibility of interference on the transmit side. On the receive side, multiple-antenna array ameliorates performance in presence of channel impairments while exploiting array-processing gain. As interference due to superposition of multiple data-streams is killed at its root, no extra energy is wasted in fighting interference and other impairments, thereby enabling energy-efficient transmission from multiple devices over multiple access channel (MAC). To validate the proposed concept, we simulate the performance of the framework against dense IoT networks deployed in generalized indoor and outdoor scenarios in terms of probability of signal outage. Results demonstrate that our conceptualized framework benefits from interference-free transmission as well as enhancement in overall system performance. Show Chinese abstract

Abstract: 在本文中，我们提出了一种空间扩展辅助框架，该框架利用时间或频率多样性或两者结合来减少由于信道损伤引起的干扰和信号损失，并促进大规模密集物联网（IoT）的高效运行。 我们的方法采用从单个物联网设备传输的数据流在索引的空间-时间（ST）、空间-频率（SF）或空间-时间-频率（STF）块上的分散。 因此，没有两个设备在同一块上发送；只有一个是激活的，而网络中的其他设备保持静默，从而最小化发射侧的干扰可能性。 在接收端，多天线阵列在存在信道损伤的情况下改善性能，同时利用阵列处理增益。 由于多数据流叠加引起的干扰在其根源被消除，因此不会额外消耗能量来对抗干扰和其他损伤，从而实现了在多址信道（MAC）上多个设备的节能传输。 为了验证所提出的概念，我们模拟了该框架在广义室内和室外场景中部署的密集物联网网络的性能，以信号中断的概率为指标。 结果表明，我们概念化的框架受益于无干扰的传输以及整体系统性能的提升。