Next Article in Journal
Supervector Extraction for Encoding Speaker and Phrase Information with Neural Networks for Text-Dependent Speaker Verification
Previous Article in Journal
Failure Probability Prediction of Thermally Stable Diamond Composite Tipped Picks in the Cutting Cycle of Underground Roadway Development
Open AccessArticle

Real-Time Mitigation of the Mobility Effect for IEEE 802.15.4g SUN MR-OFDM

Department of Electronics Engineering, Kookmin University, Seoul 02707, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(16), 3289; https://doi.org/10.3390/app9163289
Received: 27 June 2019 / Revised: 26 July 2019 / Accepted: 8 August 2019 / Published: 11 August 2019
In order to develop wireless sensor networks, which are defined by the IEEE 802.15.4 specification, researchers are considering low-power wide-area networks (LPWAN) due to their advantages of being long range, low power, low cost, and highly mobile. The issue of mobility is covered in the IEEE 802.15.4g standard for supporting a smart utility network (SUN), which is mainly controlled by orthogonal frequency-division multiplexing (OFDM) modulation. In a high mobility scenario, inter-carrier interference is a primary factor in reducing the performance of OFDM transmissions due to the destruction of the subcarrier component’s orthogonality. This paper analyzes the mobility effect in multi-rate multi-regional orthogonal frequency-division multiplexing (MR-OFDM) for low-power wide-area networks in general, and the SUN MR-OFDM system in particular. As mentioned in standard 802.15.4 2015, IEEE 802.15.4g MR-OFDM is one of the low-power wide-area (LPWA) technologies in which energy optimization problems are of first priority. We are especially interested in simple technologies that provide high efficiency. Therefore, we propose a highly adaptive method that uses the cyclic prefix to mitigate the mobility effect in real time. At a symbol frames interval of 120 us, the Doppler shift effect from the mobility of the MR-OFDM system adapted smoothly. This is not the best method to mitigate Doppler shift but it is a simple method that suits the LPWA network. The proposed scheme clearly simulated the mobility of the MR-OFDM system, and had the advantage of using a cyclic-prefix with a bit error rate performance through Additive White Gaussian Noise (AWGN) and the Rician channel of Matlab. View Full-Text
Keywords: MR-OFDM; SUN OFDM; mobility effect; carrier frequency offset; CFO; FCFO; fractional carrier frequency offset; doppler MR-OFDM; SUN OFDM; mobility effect; carrier frequency offset; CFO; FCFO; fractional carrier frequency offset; doppler
Show Figures

Figure 1

MDPI and ACS Style

Nguyen, H.; Le, N.T.; Hoan, N.C.; Jang, Y.M. Real-Time Mitigation of the Mobility Effect for IEEE 802.15.4g SUN MR-OFDM. Appl. Sci. 2019, 9, 3289.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop