A time-frequency decision-feedback loop for carrier frequency offset tracking in OFDM systems

Ni, Zuyao; Lu, Jianhua; Zheng, Junli

doi:10.1109/twc.2004.842955

Cited by 19 publications

(2 citation statements)

References 9 publications

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“…Equation (16) shows that the system sampling rate does not limit the carrier phase measurement, and thus the accuracy of the carrier phase-based ranging technique is high. Furthermore, we use the phase-lock-loop (PLL) [29] to measure the carrier phase. At the initial locking moment of the PLL, the carrier phase measurement is between [0, 1].…”

Section: High-precision Toa Estimation Scheme Based On Carrier Phasementioning

confidence: 99%

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Indoor Carrier Phase Positioning Technology Based on OFDM System

Zhang

Kang²,

Zhang³

2021

Sensors

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Carrier phase measurement is a ranging technique that uses the receiver to determine the phase difference between the received signal and the transmitted signal. Carrier phase ranging has a high resolution; thus, it is an important research direction for high precision positioning. It is widely used in global navigation satellite systems (GNSS) systems but is not yet commonly used inwireless orthogonal frequency division multiplex (OFDM) systems. Applying carrier phase technology to OFDM systems can significantly improve positioning accuracy. Like GNSS carrier phase positioning, using the OFDM carrier phase for positioning has the following two problems. First, multipath and non-line-of-sight (NLOS) propagation have severe effects on carrier phase measurements. Secondly, ambiguity resolution is also a primary issue in the carrier phase positioning. This paper presents a ranging scheme based on the carrier phase in a multipath environment. Moreover, an algorithm based on the extended Kalman filter (EKF) is developed for fast integer ambiguity resolution and NLOS error mitigation. The simulation results show that the EKF algorithm proposed in this paper solves the integer ambiguity quickly. Further, the high-resolution carrier phase measurements combined with the accurately estimated integer ambiguity lead to less than 30-centimeter positioning error for 90% of the terminals. In conclusion, the presented methods gain excellent performance, even when NLOS error occur.

show abstract

Section: High-precision Toa Estimation Scheme Based On Carrier Phasementioning

confidence: 99%

“…The matrixes F(k) and Q(k) are defined in Equation (29). Furthermore, the measurement update equation are:…”

Section: Extended Kalman Filtermentioning

confidence: 99%

Indoor Carrier Phase Positioning Technology Based on OFDM System

Zhang

Kang²,

Zhang³

2021

Sensors

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Deep Learning Network for Frequency Offset Cancellation in OFDM Communication System

Guan

Wu²

2022

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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A novel semi-blind time-frequency domain tracking algorithm suitable for MPSK-OFDM

Cai

et al. 2008

J. Electron.(China)

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This paper presents a semi-blind tracking algorithm used for Multiple Phase Shift Keying based Orthogonal Frequency Division Multiplexing (MPSK-OFDM) system. By using special preambles to assist the decision of a feedback loop and to solve the problem of phase ambiguity, the tracking performance of the algorithm has been improved greatly. Only a few preambles are needed in the algorithm since the preambles are not used to estimate the frequency offset but used to provide the variation information of the phase due to the presence of frequency offset. Simulations verify that the algorithm has low SNR bound for tracking as well as high tracking accuracy and the tracking range is expanded to 30% of one subcarrier spacing.

show abstract

A time-frequency decision-feedback loop for carrier frequency offset tracking in OFDM systems

Cited by 19 publications

References 9 publications

Indoor Carrier Phase Positioning Technology Based on OFDM System

Indoor Carrier Phase Positioning Technology Based on OFDM System

Deep Learning Network for Frequency Offset Cancellation in OFDM Communication System

A novel semi-blind time-frequency domain tracking algorithm suitable for MPSK-OFDM

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