Fractionally-spaced path diversity reception with arrays and LSSE for wideband wireless TDMA systems

In this paper, fractionally-spaced path diversity reception that employs sample matrix inversion (SMI) steering vector arrays and limited-state sequence estimation (LSSE) is proposed to cope with severe intersymbol interference. The proposed scheme estimates the fractionally-spaced channel impulse response and selects the sample timing phases of the direct and the delayed paths having maximum path power. It then calculates two sets of array weight and output response vectors to extract the direct path and the selected delayed path. LSSE is then used to estimate the most likely transmitted sequence from the array output signals. Simulation results show that this scheme can efficiently capture fractionally-spaced arrival paths and outperform symbol-spaced path diversity reception in frequency-selective fading channels