New preamble structures for synchronization and cell searching in OFDM systems

This paper proposes two new preamble structures for synchronization and cell searching in cellular based Orthog- onal Frequency Division Multiplexing (OFDM) systems. In these preambles, we impose Pseudo Noise sequences (PN-sequences) on the OFDM transmitted signal in time-domain for time and fre- quency synchronization. This scheme make it possible to achieve a good performance at a low SNR, therefore, it can guarantee a re- liable communication to a mobile located at the cell edge. Herein, the PN-sequences occupies the whole or part of the preamble ac- cording to the two different preamble structures. The proposed preamble structures are compared each other in terms of frame and frequency synchronization, cell searching and mean acqui- sition time. The simulation results elucidate that the proposed preamble structures are appropriate for cellular based OFDM sys- tems.

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