An efficient two-step approach to integer frequency offset detection for OFDM systems

An efficient preamble structure for OFDM systems is proposed which inserts a short embedded repetition pattern (SERP) into conventional preamble structures allowing a two-step detection of the integer frequency offset (IFO). A coarse estimate of the IFO using the SERP is performed in the time domain prior to performing fine IFO detection in the frequency domain based on the original preamble structure. The complexity of the overall IFO detection procedure can be significantly reduced at a price of slight loss in SNR.

► Efficient preamble structure for OFDM systems with short embedded repetition patterns.
► Efficient two-step IFO detection procedure.
► The overall detection complexity can be significantly reduced with slight loss in SNR.