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On Channel Estimation for Mobile WiMAX
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137 b
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In mobile communication channels information symbols §are transmitted through a communication§channel that is prone to fading and multipath §propagation. At the receiver, the effect of multipath§propagation is reduced by a process called channel §equalization. Channel equalization relies on an§accurate estimate of the channel state information §(CSI). This estimate is obtained using a channel§estimation algorithm. Mobile WiMAX is a recently §released technology that makes use of an§orthogonal frequency division multiplexing (OFDM) §based physical layer to transmit information over§a wireless communication channel. In this book, §frequency and time domain channel estimation§methods typically used in classical OFDM systems, §using block and comb type pilot insertion schemes,§were analyzed and adopted for mobile WiMAX. Least §squares (LS) and linear minimum mean square§error (LMMSE) channel estimation methods were §considered in the case of block type pilot insertion.§In the case of comb type pilot insertion, piecewise §constant, linear, spline cubic as well as discrete§Wiener interpolation methods were considered.
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