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SNR estimation in Nakagami-m fading with diversity combining and its application to turbo decoding

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3 Author(s)
A. Ramesh ; Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India ; A. Chockalingam ; L. B. Milstein

We propose an online signal-to-noise ratio (SNR) estimation scheme for Nakagami-m (1960) fading channels with L branch equal gain combining (EGC) diversity. We derive the SNR estimate based on the statistical ratio of certain observables over a block of data, and use the SNR estimates in the iterative decoding of turbo codes on Nakagami-m fading channels with L branch EGC diversity. We evaluate the turbo decoder performance using the SNR estimate under various fading and diversity scenarios (m = 0.5, 1, 5 and L = 1, 2, 3) and compare it with the performance using perfect knowledge of the SNR and the fade amplitudes.

Published in:

IEEE Transactions on Communications  (Volume:50 ,  Issue: 11 )