Downlink Design for Spectrum Efficient IoT Network
Downlink Design for Spectrum Efficient IoT Network
复制标题
频谱高效物联网网络的下行链路设计
DOI：
10.1109/jiot.2017.2734815
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发表时间：
2017
影响因子：
10.6
通讯作者：
Xuemai Gu
中科院分区：
文献类型：
--
作者：
Min Jia;Zhisheng Yin;Qing Guo;Gongliang Liu;Xuemai Gu
物联网（IoT）是连接海量具有通信能力的设备的新型网络。随着各种服务的需求和无线频谱的日益稀缺，我们考虑采用频谱高效频分复用（SEFDM）的非正交多载波传输方案作为物联网网络的下行链路传输方案。 SEFDM具有提高带宽使用效率的优点，但复用重叠载波会引入严重的载波间干扰(ICI)。因此，信号检测面临着恢复由于正交性损失而遭受ICI的信号的挑战。本文在下行接收器中提出了一种基于准正交补偿（QOC）的低复杂度检测器。并对QOC检测器的复杂度进行了分析。此外，还提出了一种结合QOC和固定球解码（FSD）算法的新型检测器。通过数值模拟评估 QOC 和 QOC-FSD 探测器的误码率性能。数值结果表明，QOC 和 QOC-FSD 检测器分别比传统迭代检测（ID）和 ID-FSD 获得更好的性能。此外，QOC-FSD 检测器的复杂度低于 ID-FSD 检测器。
The Internet of Things (IoT) is a new network that connects massive devices which have the communication ability. With the requirement of various services and the wireless spectrums becoming increasingly scarce, we consider a nonorthogonal multicarrier transmission scheme that is spectrum efficient frequency division multiplexing (SEFDM) as the downlink transmission scheme for IoT network. SEFDM has the merit of improved bandwidth usage efficiency, but the serious inter carrier interference (ICI) will be introduced by multiplexing overlapped carriers. Thus, the signal detection is challenged for recovering the signal which is suffered from ICI due to the loss of the orthogonality. In this paper, a low complexity detector based on quasi-orthogonality compensation (QOC) is proposed in the downlink receiver. And the complexity of the QOC detector is also analyzed. Moreover, a novel detector which joint QOC and fixed sphere decoding (FSD) algorithm is proposed. The bit error rate performances of QOC and QOC-FSD detectors are evaluated by numerical simulations. Numerical results show that the QOC and QOC-FSD detectors can achieve better performance than conventional iterative detection (ID) and ID-FSD, respectively. Furthermore, QOC-FSD detector performs a lower complexity than ID-FSD detector.