TY - JOUR
T1 - Reduction of Cyclic Prefix Overhead in Narrow-Band Internet of Things (NB-IoT) Systems
AU - Kong, Dejin
AU - Liu, Pei
AU - Fu, Yaru
AU - Ding, Jie
AU - Quek, Tony Q.S.
N1 - Publisher Copyright:
© 2012 IEEE.
PY - 2021/3
Y1 - 2021/3
N2 - 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).
AB - 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).
KW - NB-IoT
KW - cyclic prefix
KW - discrete fourier transform
KW - single-tap equalization
UR - http://www.scopus.com/inward/record.url?scp=85098780487&partnerID=8YFLogxK
U2 - 10.1109/LWC.2020.3036163
DO - 10.1109/LWC.2020.3036163
M3 - Article
AN - SCOPUS:85098780487
SN - 2162-2337
VL - 10
SP - 517
EP - 521
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 3
M1 - 9249369
ER -