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We introduce blind channel identification and equalization for orthogonal frequency division multiplexing (OFDM) system without using a guard interval (GI). Inter-symbol-interference (ISI) is significantly reduced by truncation method. To perform channel identification, Subspace and Maximum Likelihood methods are proposed. To achieve enhanced performance and robustness to channel frequency nulls, receiver diversity and OFDM is combined. The performance of the proposed system is illustrated by computer simulations.