Low complexity algorithm for channel estimation of UWB MIMO-OFDM wireless fading channels

The Fourth generation (4G) wireless networks are expected to afford high data rate transmission of multimedia services such as wireless video, wireless Internet access and mobile computing. Orthogonal frequency division multiplexing (OFDM) is an effective technique for the future 4G communications because of its great immunity to impulse noise and intersymbol interference. Ultra wide band (UWB) wireless technology is poised to replace high-speed data cables in homes and offices. UWB technology will be capable of transmitting hundreds of megabits per second over distances of several meters. Channel estimation in OFDM systems can conveniently be done by inserting a stream of pilot symbols at the transmitter and by using FIR interpolation filters at the receiver. One of the challenges in wireless system is the frequency selective fading caused due to multipath channel between the transmitter and receiver. To overcome such a multipath fading environment with low complexity and to increase the performance, this paper presents an importance of UWB OFDM for wireless fading channels.