Receiver implementation for a MIMO OFDM system

Abslra+ln this paper, we present preamble and receiver design for a Q transmit L receive multi input multi output OFDM system. Tasks performed by the receiver are synchronization in time and frequency domains, followed by channel estimation and noise variance estimation. An algorithm is developed such that only Q OFDM symbols of a generalid length are required to perform functions of the preamble. Coarse time synchronization is performed using inherent periodicity in the preamble. Frqueocy offset estimation is then performed in the time domain, followed by residual frequency offset estimation in the frequency domain followed by fine time synchronization. The channel estimntion algorithm is developed nsing least squares principle. Simulations are carried out for a broadband fixed wireless access scenario usinga preamble with and Withont zeropadding of toner in the frequency domain.