Burst carrier frequency synchronization and iterative frequency-domain frame synchronization for OFDM

摘要: Carrier frequency and frames are synchronized in bursty data transmissions over unknown channels that cause inter-symbol interference. The synchronization procedure comprises two stages. first stage performs a time-domain processing of samples to exploit periodic signal repetition extract the coarse timing, offset also resolve ambiguities. second estimates fine time received modulation signal. A estimate frame start position sequence desired may be improved by using timing generate frequency-domain samples. correlation is then determined between noiseless When fixed number training samples, “sandwich” preamble (“sandamble”) utilized achieve greater efficiency than conventional preamble.