Down-link performance of interference canceller combining path pre-selecting adaptive array and cascaded equalizer

In order to improve the capacity and quality of high-speed mobile communication systems, we proposed an interference canceller that combines a path pre-selecting adaptive array and a cascaded equalizer. The role of the adaptive array in the canceller is to reduce co-channel interference (CCI) and long-delayed inter-symbol interference (ISI). Thus, the cascaded equalizer needs less complexity. We propose to apply the canceller to the base station (BS) of a TDMA/TDD system and to reuse the receiving beam pattern in transmission. Then, in the down-link, the BS emits only the desired signal and short-delayed ISI for a desired mobile station (MS). As a result, with a simple equalizer in the MS, we can get a sufficient path diversity gain also in the down-link. The average bit error rate (BER) performance of the system in a Rayleigh fading channel is calculated by computer simulation. The results show that a sufficient path diversity gain is obtained in the down-link as well as in the up-link.