Title :
SNR estimation in Nakagami fading with diversity for turbo decoding
Author :
Ramesh, A. ; Chockalingam, A. ; Milstein, L.B.
Author_Institution :
Wireless & Broadband Commun., Synopsys (India) Pvt. Ltd., Bangalore, India
Abstract :
In this paper, we propose an online SNR estimation scheme for Nakagami-m fading channels with equal gain diversity combining. We derive the SNR estimates based on the statistical ratio of certain observables over a block of received data. An online SNR estimator for an AWGN channel has been derived by Summers and Wilson (1998). Previously, we derived an SNR estimation scheme for Nakagami-m fading channels without diversity combining and used this estimate in the decoding of turbo codes. Now, we extend the work and solve the SNR estimation problem on Nakagami fading channels with L-branch equal gain diversity combining. We use our SNR estimates in the iterative decoding of turbo codes on Rayleigh fading channels (m=1) with 2-branch equal gain combining. We show that the turbo decoder performance using our SNR estimates is quite close (within 0.5 dB) to the performance using perfect knowledge of the SNR and the fade amplitudes.
Keywords :
AWGN channels; Rayleigh channels; diversity reception; iterative decoding; parameter estimation; turbo codes; 2-branch equal gain combining; AWGN channel; L -branch equal gain diversity combining; Nakagami fading; Nakagami-m fading channels; Rayleigh fading channels; SNR estimation; iterative decoding; statistical ratio; turbo codes; turbo decoder performance; turbo decoding; AWGN channels; Amplitude estimation; Broadband communication; Convolutional codes; Diversity reception; Fading; Iterative decoding; Rayleigh channels; Turbo codes; Wireless communication;
Conference_Titel :
Military Communications Conference, 2001. MILCOM 2001. Communications for Network-Centric Operations: Creating the Information Force. IEEE
Print_ISBN :
0-7803-7225-5
DOI :
10.1109/MILCOM.2001.986024
