Design of Oversampled Filter Bank Based Widely Linear OQPSK Equalizer

In this paper, the design and analysis of multirate filter bank (FB) based OQPSK widely linear (WL) oversampled equalizers for frequency selectively channels (FSCs) are studied. We focus on OQPSK signal transmissions in FSCs with various amount of fractionally spaced equalization using WL processing under the framework of FB. We explicitly represent a OQPSK communications system as a FB which allows the study of conditions for perfect reconstruction using a finite length polynomial equalizer. Furthermore, WL FB based MMSE oversampled equalizer designs operating at various sampling rates are presented. Computer simulations are simulated to study the performance of various types of equalizers in FSCs.