TY  - JOUR
IS  - 3
KW  - Internet of Things
KW  -  narrowband
KW  -  NB-IoT
KW  -  5G
KW  -  LPWAN
KW  -  MTC
KW  -  M2M
KW  -  non-orthogonal
KW  -  waveform
KW  -  spectral effi-
ciency
KW  -  testbed
KW  -  experiment
A1  - Xu, T
A1  - Darwazeh, I
EP  - 2129
VL  - 5
Y1  - 2018/06//
TI  - Non-Orthogonal Narrowband Internet of Things: A Design for Saving Bandwidth and Doubling the Number of Connected Devices
AV  - public
N2  - IEEE Narrowband IoT (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 work provides a compressed signal waveform solution, termed fast-orthogonal frequency division multiplexing (Fast-OFDM), to double potentially the number of connected devices by compressing occupied bandwidth of each device without compromising data rate and bit error rate (BER) performance. Simulation is firstly evaluated for the Fast-OFDM with comparisons to single-carrier-frequency division multiple access (SC-FDMA). Results indicate the same performance for both systems in additive white Gaussian noise (AWGN) channel. Experimental measurements are also presented to show the bandwidth saving benefits of Fast-OFDM. It is shown that in a line-of-sight (LOS) 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 5th generation (5G) new radio (NR) networks.
SN  - 2327-4662
SP  - 2120
JF  - IEEE Internet of Things Journal
UR  - https://doi.org/10.1109/JIOT.2018.2825098
ID  - discovery10047182
N1  - This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
ER  -