Minimization of Effect of Time Delay Spread on Radio Communications with Channel Adaptive Gain and Phase Adjustment Mapper

In this paper, we present an adaptive channel estimation scheme for IEEE 802.16–2004 Wireless Metropolitan Area Network. The scheme is combined with time domain channel equalization. The simulation results and performance of proposed method can satisfy the BER requirement of IEEE 802.16–2004 standard in the non-line-of-sight environment with the highest data rate (20MHz) transmission. We have also found that when the channel is slow fading, the channel estimation inside the block can be updated using the decision feedback equalizer at each subcarrier.