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The efficient computation ofjoint direction-of-arrival the FFT based methods and the MUSIC/ESPRIT methods are (DOA) and frequency estimation from the data matrix obtained combined: from a sensor array is discussed. High-resolution ESPRIT/MUSIC 1) FFTs are used to compute the 2D-DFT of the data algorithms are used to compute the estimates. A preprocessing step

The IEEE802. I l a Wireless LAN standard defines a high s,vstem performance and therefor requires a certain signal accuracy for the OFDM transmitter output. Taking the potential analog low, medium IF and RFfilter imperfections into account if is necessary to pre-equalize the signal stream digitally before transmitting The paper will concentrate on the description of the OFDM transmitter front-end architecture and the adaptive decision-aided pre-equalization in the digital domain. The mathematics of the pre-equalization process will be derived from the well known post-equalization respectively channel-equalization case. Finally simulation results will be presented.

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