Redundant filterbank precoders and equalizers-Part II: Blind channel estimation, synchronization, and direct equalization

Transmitter redundancy introduced using FIR fllterbank precoders offers a unifying framework for single-user and multiuser transmissions. With minimal rate reduction, FIR fllterbank transmitters with trailing zeros allow for perfect (in the absence of noise) equalization of FIR channels with FIR zero-forcing equalizer fllterbanks, irrespective of the input color and the channel zero locations. Exploiting input diversity, blind channel estimators, block synchronizers, and direct selfrecovering equalizing fllterbanks are derived in this paper. The resulting algorithms are computationally simple, require small data sizes, can be implemented online, and remain consistent (after appropriate modifications) even at low SNR colored noise. Simulations illustrate applications to multicarrier modulations through channels with deep fades and superior performance relative to CMA and existing output diversity techniques relying on multiple antennas and fractional sampling.