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FBMC-OQAM can make a better use of the available spectrum, reducing the existing guard-bands. Multi-carrier modulation systems require channel equalization in order to perform a coherent detection. In OFDM, there already exist several methods for this purpose. However, those existing methods are not straightforward to be reused in FBMC-OQAM, because the intrinsic interference, caused by the prototype filters, must be canceled before the equalization process. Two alternatives for placing the pilot information for channel estimation in FBMC-OQAM are proposed in the literature, namely preamble-based and scattered pilot-based. All these techniques are using a considerable amount of time-frequency resources to allocate pilot information instead of data, thus, reducing the effective rate of the system.
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