Channel Estimation Techniques for Wideband MIMO-OFDM Communication Systems Using Complementary Codes Two-Sided Sequences

Abstract

A new design of MIMO-OFDM channel estimation using complementary codes is proposed in this paper. In the proposed algorithm a 2x2 space time code MIMO-OFDM system is considered. Instead of using single sided channel estimation techniques as in previous investigation [1], a two-sided approach is considered in. The suggested code on frequency-antenna distribution covers all the OFDM subcarriers. This is an advantage of our algorithm as previous investigations use only half of the subcarriers of the channel estimation. The considered channel model is a multi-tap fading channel model with doppler shift. The simulation results of the proposed algorithm are done assuming multi taps Rayleigh fading channel. Good results are obtained compared to other previous approaches of using complementary code in the estimation of MIMO-OFDM channels at low SNR and channel taps equal one and two.