Paper Info
Title
Reduction of Cyclic Prefix Overhead in Narrow-Band Internet of Things (NB-IoT) Systems
Abstract
Repetition mechanism is widely applied in orthogonal frequency division multiplexing (OFDM) oriented narrow-band Internet of Things (NB-IoT) systems, whereas the OFDM symbols of subscribers are transmitted for multiple times repeatedly to enhance the achievable signal-to-noise ratios at the receivers. Therein, the cyclic prefix (CP) of each OFDM symbol has also been transmitted duplicately, resulting in degenerated spectral efficiency. To remedy this issue, in this letter, we develop a versatile CP-free repetition scheme. Specifically, all CP overheads are remove when symbols are repeatedly transmitted in our approach. We explicitly demonstrate that with the explored strategy, the simple single-tap equalization is still applicable for receivers, without any inter-symbol interference. Thereafter, the channel estimation approach for the developed CP-free protocol is designed as well. Numerical simulations have been done to validate the effectiveness of the devised scheme with respects to the bit error ratio (BER) and the mean square error (MSE).
Year
DOI
Venue
2021
10.1109/LWC.2020.3036163
IEEE Wireless Communications Letters
Keywords
DocType
Volume
NB-IoT,cyclic prefix,discrete fourier transform,single-tap equalization
Journal
10
Issue
ISSN
Citations 
3
2162-2337
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
Dejin Kong132.73
Pei Liu2203.08
Yaru Fu38710.53
Jie Ding462.45
Tony Q. S. Quek53621276.75