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In this paper, the authors consider joint estimation of the channel length and of the impulse response for OFDM systems, exploiting information criteria, to find the best trade-off between noise rejection and channel description accuracy. So far, information criteria have not been considered practical channel estimation methods, due to their prohibitive complexity. They show how to make them affordable, performing channel estimation in a recursive way that allows to establish the optimal channel length with a moderate incremental cost.
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