A comparative performance study of different space-frequency filters for OFDM

This paper proposes and analyzes two different spatial filter architectures for the reception of OFDM signals: the classical sample matrix inversion (SMI) algorithm and the´ recently proposed Matched Desired Impulse Response (MDIR) beamformer. We derive the asymptotic output signal to interference plus interference ratio (SINR) provided by the two spatial filters and compare their performance in different scenarios. The results are useful in the sense that they provide the asymptotically optimum number of adjacent carriers to be processed by a single beamformer in a finite sample size situation.