  In this paper a new algorithm for adaptive dynamic channel estimation for
frequency selective time varying fading OFDM channels is proposed. The new
algorithm adopts a new strategy that successfully increases OFDM symbol rate.
Instead of using a fixed training pilot sequence, the proposed algorithm uses a
logic controller to choose among several available training patterns. The
controller choice is based on the cross-correlation between pilot symbols over
two consecutive time instants (which is considered to be a suitable measure of
channel stationarity) as well as the deviation from the desired BER. Simulation
results of the system performance confirm the effectiveness of this new channel
estimation technique over traditional non-adaptive estimation methods in
increasing the data rate of OFDM symbols while maintaining the same probability
of error.
