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| Dwpt Based FFT and Its Application to SNR Estimation in OFDM Systems
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Source |
Signal Processing: An International Journal (SPIJ) |
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Table of Contents |
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Volume: 3 Issue: 2 |
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Pages: 14-33 |
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Publication
Date: April 2009 |
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ISSN
(Online): 1985-2339 |
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Pages |
22 - 33 |
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Author(s) |
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Published
Date |
18-05-2009 |
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Publisher |
CSC
Journals, Kuala Lumpur,
Malaysia |
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ADDITIONAL
INFORMATION |
| Keywords Abstract References Cited by Related Articles Collaborative
Colleague |
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KEYWORDS: SNR, Adaptive modulation, Wavelet packet, OFDM, Noise power estimation |
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| In this paper, wavelet packet (WP) based FFT and its application to SNR estimation is proposed. OFDM systems demodulate data using FFT. The proposed solution computes the exact FFT using WP and its computational complexity is of the same order as FFT, i.e. O (Nlog2 N). SNR estimation is done inside wavelet packet based FFT block unlike previous SNR estimations techniques which perform SNR estimation after FFT. Wavelet packet analyzed data is used to perform SNR estimation in colored noise. The proposed estimator takes into consideration the different noise power levels of the colored noise over the OFDM sub-carriers. The OFDM band is divided into several sub-bands using wavelet packet and noise in each sub-band is considered white. The second-order statistics of the transmitted OFDM preamble are calculated in each sub-band and the power noise is estimated. The proposed estimator is compared with Reddy’s estimator for colored noise in terms of mean squared error (MSE). |
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S. Nema, A. Goel, R.P. Singh. "Integrated DWDM and MIMO-OFDM System for 4G High Capacity Mobile Communication System" Signal Processing: An International Journal (SPIJ), 3(5):83-143, 2009
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| Rana Shahid Manzoor : Colleagues
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| Regina Gani : Colleagues
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| Varun Jeoti : Colleagues
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| Nidal Kamel : Colleagues
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| Muhammad Asif : Colleagues
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