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In this paper, an iterative time domain Least Squares (LS) based channel estimation method using Superimposed Training (ST) for an Orthogonal Frequency Division Multiplexing (OFDM) system over frequency selective fading channels is proposed for the IEEE 802.16e 2005 standard. The estimate of the channel is generalized to provide scope for exploiting the coherence time and the coherence bandwidth for an improved performance. The performance of the channel estimator is analyzed in terms of the Mean Square Estimation Error (MSEE) and its impact on the uncoded Bit Error Rate (BER) of the OFDM system is studied.
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