SNR estimation for OFDM signals in frequency selective fading channels

Owing to the frequency-selective fading channel with a carrier frequency of OFDM (orthogonal frequency division multiplexing) signal to noise ratio (SNR) estimation problem, we proposed SNR blind estimation method based on air carrier OFDM system. Due to the inconsistency between the oscillator and the received signal, the received signal will be with a certain deviation. The presence of frequency offset destroyed the orthogonality among subcarriers and increased the interference noise, and then reduced the SNR. This paper analyzed the effects of frequency offset on the signal to noise ratio, followed by characteristics of air carrier to estimate the SNR where there is no frequency offset, and then based on the above premise to estimate SNR where the signal has the frequency offset. Finally, this paper proved the correctness of theoretical analysis by simulation.

[1]  Sayfe Kiaei,et al.  Class of cyclic-based estimators for frequency-offset estimation of OFDM systems , 2000, IEEE Trans. Commun..

[2]  Abdeldjalil Aïssa-El-Bey,et al.  Non data-aided SNR estimation of OFDM signals , 2008, IEEE Communications Letters.

[3]  Chintha Tellambura,et al.  Power delay profile and noise variance estimation for OFDM , 2006, IEEE Communications Letters.

[4]  Zeng Hua-yang.  Blind SNR Estimation Scheme for OFDM Signals with Low Complexity , 2012 .

[5]  K. Seshadri Sastry,et al.  Non Data Aided SNR Estimation for OFDM Signals in Frequency Selective Fading Channels , 2013, Wirel. Pers. Commun..

[6]  Antoine Chouly,et al.  Maximum likelihood frequency detectors for orthogonal multicarrier systems , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[7]  Wang Yi,et al.  A New Noise Variance Estimation Algorithm for Multiuser OFDM Systems , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[8]  Donald C. Cox,et al.  Robust frequency and timing synchronization for OFDM , 1997, IEEE Trans. Commun..

[9]  Michael D. Zoltowski,et al.  OFDM blind carrier offset estimation: ESPRIT , 2000, IEEE Trans. Commun..