Abstract
Narrowband Internet of Things (NB-IoT) is a low power wide area network (LPWAN) technique introduced in 3GPP release 13. The narrowband transmission scheme enables high capacity, wide coverage, and low power consumption communications. With the increasing demand for services over the air, wireless spectrum is becoming scarce and new techniques are required to boost the number of connected devices within a limited spectral resource to meet the service requirements. This paper provides a compressed signal waveform solution, termed fast-orthogonal frequency division multiplexing (FastOFDM), to double potentially the number of connected devices by compressing occupied bandwidth of each device without compromising data rate and bit error rate performance. Simulation is first evaluated for the Fast-OFDM with comparisons to singlecarrier-frequency division multiple access (SC-FDMA). Results indicate the same performance for both systems in additive white Gaussian noise channel. Experimental measurements are also presented to show the bandwidth saving benefits of Fast-OFDM. It is shown that in a line-of-sight scenario, Fast-OFDM has similar performance as SC-FDMA but with 50% bandwidth saving. This research paves the way for extended coverage, enhanced capacity and improved data rate of NB-IoT in fifth generation new radio networks.
Highlights
I NTERNET of Things (IoT) technologies are becoming increasingly popular and their ubiquity is bound to become a fact with large number of devices connected to enable machine to machine communication applications
One challenge for low power wide area network (LPWAN) is to support a large number of devices within a limited spectral resource
This paper provides an efficient solution, which could double the number of connected devices, by using a bandwidth compressed signal waveform
Summary
I NTERNET of Things (IoT) technologies are becoming increasingly popular and their ubiquity is bound to become a fact with large number of devices connected to enable machine to machine communication applications. The signal is designed based on long term evolution (LTE) standard It allows low-cost and fast deployment within existing physical infrastructure. This paper studies an approach for doubling the number of connected devices through using bandwidth compressed signal waveforms. A signal waveform termed Fast-OFDM [15]–[18], saving 50% of bandwidth, is theoretically and practically investigated for the NB-IoT applications. The testbeds introduced in work [8], [12]–[14] implemented full functions of NB-IoT either for academic research or industrial test Their NB-IoT modules are fixed and designed based on the standard [19] and maintaining the bandwidth and/or the number of connected devices. The signal format we proposed follows typical NB-IoT standard signal but with minor modifications
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