OFDM Tutorial Series: ISI Decision Feedback

The OFDM Tutorial Series goes in depth into the theory and implementation of OFDM wireless communication systems. Starting with the treatment of multipath fading channels, OFDM is introduced as a bandwidth efficient robust communication system for multipath fading channels. Using IEEE 802.11a as a basis, a full OFDM system is described in both theory and implementation. In particular, detailed description of acquisition including packet detection, timing synchronization, carrier frequency offset estimation and correction and channel estimation and equalization is presented along with implementation details.
For the Tutorial on OFDM and OFDMNA visit:
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For MIMO OFDM Tutorial Series visit the following site for detailed information:
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For the PDF File for Each OFDM Tutorial See the Link Below :
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[@misterguts]

16:40 I think it's interesting that a transmitter can send a known pattern that helps each receiver develop its own multipath fading graph. I wonder if anything interesting would come of aggregating all those multipath fading graphs from many receiving locations, and over time. Could some sort of map be built of scattering/reflections in the transmitter's environs, a sort of passive radar?

[@MS.TIYASAPANJA]

So training sequence will be for how much time? Shall there be N elements in training sequence since there is N taps?