A new frequency detector for orthogonal multicarrier transmission techniques

Synchronization for OFDM-Based Systems

“…A non-data-aided technique can adjust the fine timing and frequency after the preamble signal. Some non-data-aided techniques have been proposed (Bolcskei, 2001, Daffara & Adami, 1995, Lv et al, 2005, Okada et al, 1996, Park et al, 2004, Van de Beek et al, 1997.…”

Near-Instantaneously Adaptive HSDPA-Style OFDM Versus MC-CDMA Transceivers for WIFI, WIMAX, and Next-Generation Cellular Systems

“…Once the composite misadjustment has been estimated, it may also be readily compensated. Frequency and timing fine-tracking algorithms exploiting the OFDM signal's cyclic extension were published by Moose [78], Daffara [80], and Sandell [81], where it was exploited that the phasechange across the OFDM symbol's duration imposed by the time-delay alone is known. If the actual phase difference deviates from the expected difference, this may be deemed to be the consequence of oscillator frequency-or phase errors and hence may be compensated.…”

Joint synchronization in Eureka 147 DAB system based on abrupt phase change detection

“…A log-likelihood ratio is defined to be (11) and a decision function can be defined as (12) where is negatively related to the log-likelihood ratio for the observations from to . At a fixed sample size , the optimal decision rule is given by is chosen, if is chosen, if where is a threshold that can be determined by the variances of the two distributions in (10) and the sample size .…”