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Simplified Random Access Design for Satellite Internet of Things with NOMA

机译：简化了卫星互联网的随机接入设计与NOMA

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Satellite Internet of Things (IoT) is a promising technical trend to tackle the ubiquitous connection requirements for 5G and beyond. In satellite IoT, the conventional random access scheme faces huge interaction overhead caused by the complicated signaling interactions and the large propagation delay of the satellite-ground link. To tackle this problem, we propose a simplified random access scheme. By utilizing the collision tolerance of non-orthogonal multiple access (NOMA) technology, random access and data transmission are integrated to reduce the overall interaction delay. At the transmitter side, the transmitted symbols are spread by the non-orthogonal sequence and the preamble corresponding to the non-orthogonal sequence. At the receiver side, the received signal is iteratively processed based on the minimum mean square error (MMSE) and serial interference cancellation (SIC). The simulation results show that the proposed scheme can reduce the transmission delay without losing the success rate of random access compared with the conventional scheme that only relies on preamble detection.
机译：卫星互联网（物联网）是一个有前途的技术趋势，可以解决5克及以后的无处不在的连接要求。在卫星IOT中，传统的随机接入方案面临着由复杂的信令相互作用和卫星接地链路的大传播延迟引起的巨大相互作用开销。为了解决这个问题，我们提出了一种简化的随机访问方案。通过利用非正交多次访问（NOMA）技术的碰撞公差，集成了随机接入和数据传输以降低整体交互延迟。在发射器侧，所发送的符号由非正交序列和与非正交序列对应的前导码分开。在接收器侧，基于最小均方误差（MMSE）和串行干扰消除（SIC）迭代地处理接收信号。仿真结果表明，与仅依赖于前导码检测的传统方案相比，所提出的方案可以减少传输延迟，而不会失去随机接入的成功率。

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