AUTHORS: Gamal Mabrouk Abdel-Hamid, Reham S. Saad

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ABSTRACT: A new blind channel estimation method for long term evaluation (LTE) based on combining advantages of denoising property of wavelet transform (WT) with blind estimation capability of independent component analysis (ICA) called wavelet denoising of ICA (WD-ICA) is presented. This new method increases the spectral efficiency compared to training based methods, and provides considerable performance enhancement over conventional ICA methods. The conventional blind channel estimation methods based on ICA is performed individually for each orthogonal frequency division multiplexing (OFDM) subcarrier. To reduce complexity of implementation of WD-ICA method, channel interpolation is used. This method is presented for multiple-input-multiple-output (MIMO) downlink LTE system. WD-ICA method is compared to conventional ICA methods and the Performance is evaluated by calculating normalized mean square error (NMSE) and bit error rate (BER). WD-ICA method as compared to the other known ICA channel estimation methods has lower complexity, lower value of NMSE, and lower value of BER, which indicates the superiority of the proposed method.

KEYWORDS: -LTE, Blind channel estimation, WT, ICA, OFDM, MIMO

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