Adaptive OFDM synchronization algorithms based on discrete stochastic approximation

Adaptive OFDM synchronization using quadratic search step sizes

“…In the pioneering work of [3], two adaptive algorithms are proposed: 1) locally convergent designed for constant STO and 2) globally convergent designed for time varying STO. Both algorithms utilize an empirical measure of the occupation probability α.…”

“…In [4], the algorithms from [3] are combined to achieve higher tracking accuracy and speed. It combines a locally convergent and globally convergent algorithm into one algorithm based on the use of a gate value.…”

“…In order to reduce the high computational complexity, two adaptive real-time OFDM synchronization algorithms were presented in [3] and [4]. Both algorithms significantly reduce the computational complexity (and thus power consumption), however, each algorithm has its own drawbacks.…”

“…Both algorithms significantly reduce the computational complexity (and thus power consumption), however, each algorithm has its own drawbacks. In [3], the convergence time can be slow especially for large OFDM symbol periods when changes to the STO occur. In [4], the algorithm's performance is dependent upon a parameter that varies with the channel.…”

“…Section II briefly reviews the two adaptive OFDM synchronization algorithms presented in the literature and presents the proposed algorithm. Section III presents simulation results that compare the performance of the proposed algorithm with the adaptive algorithms presented in [3]- [4] and the non-adaptive algorithm presented in [2]. The paper is concluded in Section IV.…”