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Abstract : |
Abstract: Transmitter redundancy introduced using filterbank preceders generalizes existing modulations including OFDM, DMT, TDMA, and CDMA schemes encountered with single-and multi-user communications. Sufficient conditions are derived to guarantee that with FIR filterbank preceders FIR channels are equalized pefectly in the absence of noise by FIR zero-forcing equalizer ' filterbanks, irrespective of the channel zero locations. Multicarrier trans-missions through fivquency-selective channels can thus be recovered even when deep fades are present. Jointly optimal transmitter-receiver filterbanks are also designed based on maximum output SNR and minimum mean-square error criteria under ' zero-forcing and fixed transmitted power ' constraints. More important, direct blind FIR equalizer ' filterbanks become possible which are: (i)deterministic, zero-forcing and capable of equalizing any FIR channel with small data sets; (ii)simple computationally and consistent statistically; (ill)equipped with rich structure al-lowing blind block synchronization and online algorithms., |
