Abstract
Narrowband Internet of Things (NB-IoT) was introduced by 3GPP in low power wide area network to support low power and wide coverage applications. Since it follows long term evolution standard, its signal quality is guaranteed and its deployment is straightforward via reusing existing infrastructures. Current NB-IoT supports low data rate services via using low order modulation formats for the purpose of power saving. However, with the increase of data rate driven applications, next generation NB-IoT would require data rate enhancement techniques without consuming extra battery power. In this paper, a downlink framework, using a nonorthogonal signal waveform for next generation enhanced NB-IoT (eNB-IoT), is proposed and experimentally tested in both single-antenna and multiantenna systems. In the single-antenna scenario, waveform precoding is used to pre-equalize the self-created inter carrier interference distorted signal waveform. For the multiantenna multiuser scenario, both waveform and antenna space precoding have to be used. Measured results show that in both single-antenna and multiantenna systems, the proposed signal waveform in eNB-IoT can increase data rate by ~11% compared with NB-IoT occupying the same spectral resource in similar receiver computational complexity.
Highlights
N ARROWBAND Internet of Things (NB-IoT) [1] is a cellular IoT technique standardized in 3GPP
We evaluate error vector magnitude (EVM) and bit error rate (BER) for received constellation diagrams together with data rate demonstrations
This paper proposed to use a nonorthogonal multicarrier spectrally efficient frequency division multiplexing (SEFDM) signal waveform to enhance the data rate for generation enhanced NB-IoT (eNB-IoT)
Summary
N ARROWBAND Internet of Things (NB-IoT) [1] is a cellular IoT technique standardized in 3GPP. It provides quality guaranteed services due to its paid spectral license. Unlike other IoT techniques, such as LoRa [2] and SigFox [3], NB-IoT employs multicarrier signal waveform and is compatible with fourth generation long term evolution networks. Its deployment is straightforward [4] and it is becoming quite important in many IoT-based applications and it leads the way for future narrowband fifth generation. The downlink signal of NB-IoT occupies 12 subcarriers with total bandwidth of 180 kHz. Its uplink channel supports
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