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This paper investigates effects of pilot assisted channel estimation on dynamic resource allocation in a multiuser orthogonal frequency division multiplexing (OFDM) system. The channel estimation is done in each OFDM symbol through least-squared error (LSE) or minimum mean-squared error (MMSE) algorithm. The performance of each of these algorithms is evaluated through computer simulations. The maximal total capacity and the fair resource allocations are considered. It is shown that there is an optimal power distribution among pilots and data for maximizing the capacity. It is also shown that the equal power allocation among data subchannels is the optimum for maximizing the system capacity with channel estimation.