TY - JOUR
T1 - Frame detection and timing acquisition for OFDM transmissions with unknown interference
AU - Sanguinetti, Luca
AU - Morelli, Michele
AU - Poor, H. Vincent
N1 - Funding Information:
Manuscript received August 12, 2009; revised October 19, 2009; accepted December 5, 2009. The associate editor coordinating the review of this paper and approving it for publication was D. Huang. L. Sanguinetti and M. Morelli are with the University of Pisa, Department of Information Engineering, Via Caruso 56126 Pisa, Italy (e-mail: {luca.sanguinetti, michele.morelli}@iet.unipi.it). H. V. Poor is with the Department of Electrical Engineering, Princeton University, Princeton, NJ 08544 USA (e-mail: [email protected]). This research was supported in part by the U. S. National Science Foundation under Grant CNS-09-05398. Digital Object Identifier 10.1109/TWC.2010.03.091213
PY - 2010/3
Y1 - 2010/3
N2 - 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. 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 position of the training symbol within the received data stream. Computer simulations indicate that the proposed solutions are remarkably robust to NBI and outperform existing alternatives in a severe interference scenario. The price for this advantage is a substantial increase in the computational burden.
AB - 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. 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 position of the training symbol within the received data stream. Computer simulations indicate that the proposed solutions are remarkably robust to NBI and outperform existing alternatives in a severe interference scenario. The price for this advantage is a substantial increase in the computational burden.
KW - Frame and timing synchronization
KW - Generalized likelihood ratio test (GLRT)
KW - Inverse-gamma distribution
KW - Narrowband interference
KW - OFDM
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U2 - 10.1109/TWC.2010.03.091213
DO - 10.1109/TWC.2010.03.091213
M3 - Article
AN - SCOPUS:77949548114
SN - 1536-1276
VL - 9
SP - 1226
EP - 1236
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 3
M1 - 5427454
ER -