TY - JOUR
T1 - Pilot-Based Time Domain SNR Estimation for Broadcasting OFDM Systems
AU - Khan, Abid Muhammad
AU - Jeoti, Varun
AU - Rehman, Muhammad Zaka Ur
AU - Jilani, Muhammad Taha
AU - Chugtai, Omer
AU - Rehmani, Mubashir Hussain
N1 - Publisher Copyright:
© 2018 Abid Muhammad Khan et al.
PY - 2018
Y1 - 2018
N2 - The estimation of signal-to-noise ratio (SNR) is a major issue in wireless orthogonal frequency-division multiplexing (OFDM) system. In OFDM system, each frame starts with a preamble symbol that facilitates the SNR estimation. However, the performance of preamble-based SNR estimation schemes worsens in the fast-changing environment where channel changes symbol to symbol. Accordingly, in this paper, we propose a novel pilot-based SNR estimation scheme that optimally exploits the pilot subcarriers that are inserted in each data symbol of the OFDM frame. The proposed scheme computes the circular correlation between the received signal and the comb-type pilot sequence to obtain the SNR. The simulation results are compared with the conventional preamble-based Zadoff-Chu sequence SNR estimator. The results indicate that the proposed scheme generates near-ideal accuracy; especially in low SNR regimes, in terms of the normalized mean square error (NMSE). Moreover, this scheme offers a significant saving of computation over a conventional time domain SNR estimator.
AB - The estimation of signal-to-noise ratio (SNR) is a major issue in wireless orthogonal frequency-division multiplexing (OFDM) system. In OFDM system, each frame starts with a preamble symbol that facilitates the SNR estimation. However, the performance of preamble-based SNR estimation schemes worsens in the fast-changing environment where channel changes symbol to symbol. Accordingly, in this paper, we propose a novel pilot-based SNR estimation scheme that optimally exploits the pilot subcarriers that are inserted in each data symbol of the OFDM frame. The proposed scheme computes the circular correlation between the received signal and the comb-type pilot sequence to obtain the SNR. The simulation results are compared with the conventional preamble-based Zadoff-Chu sequence SNR estimator. The results indicate that the proposed scheme generates near-ideal accuracy; especially in low SNR regimes, in terms of the normalized mean square error (NMSE). Moreover, this scheme offers a significant saving of computation over a conventional time domain SNR estimator.
UR - http://www.scopus.com/inward/record.url?scp=85048159750&partnerID=8YFLogxK
U2 - 10.1155/2018/9319204
DO - 10.1155/2018/9319204
M3 - Article
AN - SCOPUS:85048159750
VL - 2018
JO - Journal of Computer Networks and Communications
JF - Journal of Computer Networks and Communications
SN - 2090-7141
M1 - 9319204
ER -