Frame detection and timing acquisition for OFDM transmissions with unknown interference

Abstract--Frame detection and timing acquisition are challenging tasks in orthogonal frequency-division multiplexing systems plagued by narrowband interference (NBI). Most existing solutions operate in the time domain by exploiting the repetitive structure of a training symbol and suffer from considerable performance loss in the presence of NBI. In this work, a novel solution in which frame detection is accomplished in the frequency domain on the basis of a suitable likelihood ratio test is presented. In order to increase the resilience to NBI, the interference power is treated as a nuisance parameter that is averaged out from the corresponding likelihood functions. The resulting test statistic depends on the fractional carrier frequency offset (CFO), which is easily estimated by means of heuristic arguments. An alternative scheme that dispenses from CFO estimation is also proposed. After frame detection, the test statistic is employed as a timing metric to accurately locate the positi...

• Type: Journal
• Year: 2010
• Where: TWC
• Authors: Luca Sanguinetti, Michele Morelli, H. Vincent Poor
• Keywords: Artificial Intelligence, Frame Detection, Orthogonal Frequency-division Multiplexing, Training Symbol, TWC 2010