Large CFO Acquisition using Partially Geometric Modulatable Orthogonal Sequences

The geometric sequence has been shown feasible for large carrier frequency offset (CFO) acquisition, while the modulatable orthogonal sequence (MOS) has been used to assist joint time synchronization and channel estimation in orthogonal frequency-division multiplexing (OFDM) systems. This paper first proposes a method to make an MOS partially geometric. Consequently, the partially geometric MOS can be utilized to accomplish large CFO acquisition, time synchronization, and channel estimation concurrently. Based on the partially geometric MOS, we propose a large CFO acquisition technique, which is able to cooperate with a conventional joint time synchronization and channel estimation scheme. Finally, computer simulations demonstrate the performance of the proposed technique.