Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 3 Kleinheubacher Berichte 2004 2005 10.5194/ars-3-27-2005 http://www.adv-radio-sci.net/3/27/2005/ http://www.adv-radio-sci.net/3/27/2005/ars-3-27-2005.html http://www.adv-radio-sci.net/3/27/2005/ars-3-27-2005.pdf 27 37 2005-05-12 OFDM: From the Idea to Implementation S. A. Fechtel Infineon Technologies AG, Rosenheimer Str. 116, 81699 M¨unchen, Germany OFDM (orthogonal frequency-division multiplexing) is one of the key digital communication technologies of the current decade. The first part of this paper presents the fundamentals of OFDM and its benefits in the presence of multipath propagation in a tutorial-like fashion. The second part details on some of the most important aspects of OFDM transceiver implementation: concept of receiver channel filtering and A/D conversion, radio impairment compensation (I/Q mismatch), and OFDM demodulator (FFT) design.