Interference Analysis in the LTE and NB-IoT Uplink Multiple Access with RF impairments
Interference Analysis in the LTE and NB-IoT Uplink Multiple Access with RF impairments
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DOI：
10.1109/icdsp.2018.8631794
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Gustavo J. González;F. Gregorio;J. Cousseau
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文献类型：
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作者：
Gustavo J. González;F. Gregorio;J. Cousseau
窄带物联网（NB-IoT）考虑将数千个设备连接到单个LTE基站（BS）。为了使与传统LTE用户设备（UE）的共存成为可能，BS将若干IoT UE分配到特殊物理资源块（PRB）中。这些特殊的PRB降低了IoT发射机的复杂性，但使LTE信号干扰IoT PRB。物联网节点通常成本低，因此容易遭受RF损伤。LTE干扰和RF损伤损害了IoT节点的性能。在本文中，我们分析了LTE和物联网在多址上行链路中的共存，考虑RF损伤。我们分析了保护频带的使用，以减少物联网中LTE的干扰。此外，我们评估允许的载波频率偏移（CFO）和I/Q不平衡水平，以确保合理的系统性能。
Narrowband internet of things (NB-IoT) considers the connection of thousands of devices to a single LTE base station (BS). To make possible the coexistence with classic LTE user equipements (UE)s, the BS allocates several IoT UEs into special physical resource blocks (PRB)s. These special PRBs reduce the IoT transmitter complexity but make the LTE signal interfere with the IoT PRBs. IoT nodes are in general low-cost and therefore prone to suffer from RF impairments. The LTE interference and the RF impairments compromise the performance of IoT nodes. In this paper, we analyze the coexistence of LTE and IoT in the multiple access uplink, considering RF impairments. We analyze the use of guard bands to reduce the interference from LTE in IoT. Also, we evaluate the allowable carrier frequency offset (CFO) and I/Q imbalance levels that ensures a reasonable system performance.