An improved MIMO-OFDM channel estimator in the tracking phase [articol]

Abstract

MIMO (Multiple Input Multiple Output) channels provide high theoretical capacity, today intensively exploited in modern communication systems, where they employ space diversity or/and provide a spectral efficiency increase. The performances of such communication systems however greatly depend on the channel estimator accuracy [1]. Keeping in account the possible fast channel variation, just a test sequence based periodic evaluation may not be sufficient. Hence, it is necessary to design a channel estimator for the tracking phase in which the channel coefficients are updated during the data frames.