Two-dimensional (recursive) channel equalization for multicarrier systems with soft impulse shaping (MCSIS)

Multicarrier (MC) systems are attractive for the use in mobile radio environments, because they can handle long echoes better than single carrier (SC) systems. To be able to optimally exploit the diversity immanent in the transmission channels a multicarrier system with soft impulse shaping (MCSIS) has been introduced in previous works. This system, that in itself carries intersymbol and adjacent channel interference (ISI and ACI), has so far been implemented with the suboptimal solution of a one-dimensional equalization in either time or frequency direction only. This paper now investigates the possibilities of using MCSIS with two-dimensional equalization structures, either implemented as a combination of two one-dimensional equalizers (pseudo two-dimensional equalization) or implemented with a real two-dimensional equalizer.