Block Redundant Constant Modulus Equalization for Fir Channel–irrespective Blind Identifiability

FIR filterbank precoders offer a unifying framework for several digital modulation and multiplexing schemes used in singleand multi-user transmissions, such as OFDM and CDMA. With minimal reduction in bandwidth efficiency, FIR filterbank transmitters can be designed to allow for perfect (in the absence of noise) equalization of any FIR channel with FIR zero-forcing (ZF) equalizer filterbanks. The key idea in this paper is to apply the constant modulus algorithm (CMA) to block transmission schemes that use redundant precoding. The resulting modulation/multiplexing techniques guarantee perfect equalization of an FIR channel with an FIR filterbank equalizer of a priori known order, without the restrictions of blind adaptive FIR CMA equalizers that rely on multiple antennas and fractional sampling.