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This letter considers the channel estimation for subband orthogonal frequency division multiple access (OFDMA) operating over highly time-frequency selective (i.e.,doubly selective) channels.Based on general basis expansion model,two expectation maximization-type channel estimation methods are proposed for subband OFDMA in order to overcome channel time-frequency selectivity.The proposed method is compared with conventional approach and is shown to be superior to the conventional one.
This letter considers the channel estimation for subband orthogonal frequency division multiple access (OFDMA) operating over highly time-frequency selective (ie, doubly selective) channels. Based on generalized expansion model, two expectation maximization-type channel estimation methods are proposed for subband OFDMA in order to overcome channel time-frequency selectivity. Proposed method is compared with conventional approach and is shown to be superior to the conventional one.