# SNR Estimation in Generalized Fading Channels and its Application to Turbo Decoding

Ramesh, A and Chockalingam, A and Milstein, LB (2001) SNR Estimation in Generalized Fading Channels and its Application to Turbo Decoding. In: 2001 IEEE International Conference on Communications. ICC 2001, 11-14 June, Helsinki,Finland, Vol.4, 1094 -1098.

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Official URL: http://dx.doi.org/10.1109/ICC.2001.936822

## Abstract

In this paper, we propose an online SNR estimation scheme for generalized fading channels. We derive the SNR estimate based on a statistical ratio of observables over a block of data, when the channel undergoes Nakagami fading. An online SNR estimator for AWGN channels has been derived by Summers and Wilson. Our SNR estimation scheme in this paper is for a general Nakagami fading channel, where the SNR estimates in Rayleigh fading and AWGN can be obtained as special cases corresponding to the Nakagami parameter $m\hspace{5mm}=\hspace{5mm}1$ and $m\hspace{5mm}=\hspace{5mm}\infty$, respectively. As an example, we use our SNR estimate in the iterative decoding of turbo codes on both i.i.d and correlated Rayleigh fading channels. We show that the turbo decoder performance on Rayleigh fading channels using our SNR estimate is close to the performance using perfect knowledge of the fade amplitudes and the SNR

Item Type: Conference Paper Copyright 1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. SNR estimate;Nakagami fading;Turbo codes Division of Electrical Sciences > Electrical Communication Engineering 16 Feb 2006 04 Jul 2011 11:08 http://eprints.iisc.ernet.in/id/eprint/5377