On Channel Estimation for Mobile WiMAX

In mobile communication channels information symbols are transmitted through a communicationchannel that is prone to fading and multipath propagation. At the receiver the effect of multipathpropagation is reduced by a process called channel equalization. Channel equalization relies on anaccurate estimate of the channel state information (CSI). This estimate is obtained using a channelestimation algorithm. Mobile WiMAX is a recently released technology that makes use of anorthogonal frequency division multiplexing (OFDM) based physical layer to transmit information overa wireless communication channel. In this book frequency and time domain channel estimationmethods typically used in classical OFDM systems using block and comb type pilot insertion schemeswere analyzed and adopted for mobile WiMAX. Least squares (LS) and linear minimum mean squareerror (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 discreteWiener interpolation methods were considered.