Improved method for MIMO-OFDM frame synchronization and carrier frequency offset estimation
Minjian Zhao · Journal of Zhejiang University(Engineering Science) · 2006
Frame synchronization in MIMO-OFDM(multi input multi output-orthogonal frequency division multipluxing) systems is more difficult than in OFDM systems because one receive antenna will get several waveforms from different transmit antennas.Furthermore,those waveforms will be degraded by multi-path delay.An improved preamble structure for MIMO-OFDM frame synchronization and carrier frequency offset estimation was presented.The orthogonal preamble for frame synchronization makes it possible that a receive antenna can distinguish the fine arriving time of different signals from different transmit antennas.The preamble is not only orthogonal in time domain,but also has a fine characteristic in frequency domain.Simulation results show that the preamble structure has good performance both in frame synchronization and carrier frequency offset estimation.