naa a22 4500 510793126 CHVBK 20180411083326.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11277-012-0686-3 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0686-3 Non Data Aided SNR Estimation for OFDM Signals in Frequency Selective Fading Channels [Elektronische Daten] [K. Sastry, M. Prasad Babu] This paper deals with the problem of non data aided (NDA) signal to noise ratio (SNR) estimation of OFDM signals transmitted through unknown multipath fading channel. Most of present day's SNR estimators are based on the knowledge of pilot sequences which is not applicable in some contexts such as cognitive radio for example. Moreover in Multipath fading channels SNR also depends on frequency offset which is caused by mismatch between the oscillator in the transmitter and that in the receiver. Previous NDA SNR estimation schemes assumed a perfect synchronization at reception (i.e. τ= 0 and $${\varepsilon = 0}$$ ) which results estimation of SNR with less accuracy. The frequency offset attenuates the desired signal and causes intercarrier interference, thus reducing the SNR. In this paper we propose a new NDA SNR estimator which uses periodic redundancy induced by the cyclic prefix, considering SNR degradation due to frequency offset ( $${\varepsilon}$$ ). Springer Science+Business Media, LLC., 2012 NDA SNR estimation nationallicence Frequency offset nationallicence Frequency selective fading channels nationallicence N : Number of subcarriers nationallicence E s : Signal power nationallicence a k : Transmitted data symbols nationallicence D : CP length nationallicence L : Rayleigh fading channel impulse response nationallicence $${\varepsilon}$$ : Carrier frequency offset nationallicence $${\vartheta}$$ : Initial arbitrary carrier phase nationallicence τ : Timing offset nationallicence η ( m ) : Additive white Gaussian noise nationallicence S c (K) : Inter carrier interference (ICI) coefficients nationallicence S : Signal power nationallicence $${\mathop \sigma \nolimits_n^2}$$ : Noise variance nationallicence M : Number of OFDM symbols in the observation window nationallicence $${\xi(u)}$$ : A random variable which follows a chi square distribution nationallicence α : Cycle frequency nationallicence δ (.) : Kronecker symbol nationallicence N c : The number of considered cycle frequencies to estimate the signal power nationallicence B c : Coherence bandwidth nationallicence $${^{\beta}}$$ : Coefficient expressing the desired correlation rate nationallicence H[κ] : Channel gain nationallicence SNR0 : Average SNR in the absence of a carrier frequency offset nationallicence Sastry K. Department of CS&SE, Andhra University, 530003, Visakhapatnam, India aut Prasad Babu M. Department of CS&SE, Andhra University, 530003, Visakhapatnam, India aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 165-175 0929-6212 70:1<165 2013 70 11277 https://doi.org/10.1007/s11277-012-0686-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0686-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sastry K. Department of CS&SE, Andhra University, 530003, Visakhapatnam, India aut NATIONALLICENCE 700 1- Prasad Babu M. Department of CS&SE, Andhra University, 530003, Visakhapatnam, India aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/1(2013-05-01), 165-175 0929-6212 70:1<165 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer