A NEW PREAMBLE STRUCTURE BASED ON GOLAY COMPLEMENT PAIR FOR TIME SYNCHRONIZATION IN OFDM

The efficiency in bandwidth utilization and resilience to channel-induced fading makes the OFDM a preferred multicarrier modulation scheme. But the sensitivity of OFDM to frequency and time synchronization errors needs due consideration to avoid system degradation. The purpose of time synchronization is to compensate time offsets and identify the correct starting point of the OFDM frame and symbol at the demodulator. This paper analyzes the offset estimation capability of commonly used preamble sequences and proposes a new preamble structure incorporating Golay sequence with improved merit factor. The simulated results show that the proposed method outperforms the classical time offset estimation methods