The paper addresses a problem of tracking multiple number of frequencies using Regularized Autoregressive (RAR) approximation. The RAR procedure allows to decrease approximation bias, comparing to other AR-based frequency detection methods, while still providing competitive variance of sample estimates. We show that the RAR estimates of multiple periodicities are consistent in probability and i...

Frequency hopping systems have traditionally been applied in low-data rate applications where the received signal can be considered narrow-band. The multipath delays encountered in a wireless channel has considerably less a ect on a narrow-band signal. In such cases, delay estimation is not of much signi cance. However, delay estimation becomes increasingly important when the bandwidth of the s...

Frequency estimation has been studied for a number of years. One reason for this is that the problem is easy to understand, but difficult to solve. Another reason, for sure, is the large number of applications that involves frequency estimation, e.g radar applications using frequency modulated continuous wave (FMCW) techniques where the distance to the target is embedded in the frequency, reson...

In this paper, we propose a novel frequency offset estimation scheme for orthogonal frequency division multiplexing (OFDM) systems. By correlating the OFDM signals within the coherence phase bandwidth and employing a threshold in the frequency offset estimation process, the proposed scheme is not only robust to the timing offset but also has a reduced complexity compared with that of the conven...

Frequency synchronization is a critical requirement for single-carrier frequency division multiple-access (SC-FDMA) uplink transmissions. Based on the key observation that the received signal at the base station can be formulated as the parallel factor analysis model, we present a joint carrier frequency offset (CFO) estimation and compensation scheme for SC-FDMA uplink transmissions with inter...

This paper deals with Carrier Frequency Offset (CFO) estimation for OFDM systems using repetitive patterns in the training symbol. A theoretical comparison based on Cramer Rao Bounds (CRB) for two kinds of CFO estimation methods has been presented in this paper. Through the comparison, it is shown that the performance of CFO estimation can be improved by exploiting the repetition property and t...

In this paper, Radio Frequency IDentification (RFID) tag set cardinality estimation problem is considered under the model of multiple independent reader sessions with unreliable radio communication links in which transmission errors might occur. After the R-th reader session, the number of tags detected in j (j = 1, 2, ..., R) reader sessions is updated, which we call observed evidence. Then, i...

Orthogonal Frequency Division Multiplexing (OFDM) systems are very sensitive to the frequency offset of the local oscillator at the receiver while the symbol timing offset can be absorbed in the guard interval. For the same reason, estimation of the frequency characteristics, needed for OFDM to be adapted to the frequency selective fading, can only be carried out conventionally after the freque...

In this paper, we address the problem of carrier frequency offset (CFO) estimation for Orthogonal Frequency Division Multiplexing (OFDM) communications systems with multiple antennas. We reconstruct the received signal to form data model with multiinvariance property, and subsequently derive a multiple-invariance ESPRIT algorithm for CFO estimation. This algorithm has improved CFO estimation co...

ALYSIS OF ESPRIT BASED JOINT ANGLE-FREQUENCY ESTIMATION A weke N. Lemma , Alle-Jan van der Veen and Ed F. Deprettere Delft University of Technology, Faculty of Information Technology Mek elweg 4, 2628 CD Delft, The Netherlands [email protected] ABSTRACT High-resolution parameter estimation techniques have recently been applied to jointly estimate multiple signal parameters. In this work,...