A novel carrier frequency tracking scheme for time domain differential OFDM

2005 ◽  
Author(s):  
Huilin Xu ◽  
Guo Wei ◽  
Jinkang Zhu
Keyword(s):  
Time Domain ◽  
Carrier Frequency ◽  
Frequency Tracking

Implementation and Performance Assessment of a Vector Tracking Method Based on a Software GPS Receiver

2011 ◽  
Vol 64 (S1) ◽  
pp. S151-S161 ◽  
Author(s):  
Sihao Zhao ◽  
Mingquan Lu ◽  
Zhenming Feng
Keyword(s):  
Global Positioning System ◽  
Carrier Frequency ◽  
Gps Receiver ◽  
Tracking Loop ◽  
Frequency Tracking ◽  
Tracking Method ◽  
Global Positioning ◽  
Vector Tracking ◽  
Tracking Loops ◽  
And Performance

A number of methods have been developed to enhance the robustness of Global Positioning System (GPS) receivers when there are a limited number of visible satellites. Vector tracking is one of them. It utilizes information from all channels to aid the processing of individual channels to generate receiver positions and velocities. This paper analyzes relationships among code phase, carrier frequency, and receiver position and velocity, and presents a vector loop-tracking algorithm using an Extended Kalman filter implemented in a Matlab-based GPS software receiver. Simulated GPS signals are generated to test the proposed vector tracking method. The results show that when some of the satellites are blocked, the vector tracking loop provides better carrier frequency tracking results for the blocked signals and produces more accurate navigation solutions compared with traditional scalar tracking loops.

A Novel ZF-Based MAI Cancellation Scheme in the Time Domain for SC-FDMA System

2013 ◽  
Vol 427-429 ◽  
pp. 2432-2435
Author(s):  
Yu Lei Zhang ◽  
Tian Yuan Zhang ◽  
Shu Xin Guo
Keyword(s):  
Time Domain ◽  
Carrier Frequency ◽  
Multiple Access ◽  
Carrier Frequency Offset ◽  
Frequency Division ◽  
Single Carrier ◽  
Error Ratio ◽  
Bit Error Ratio ◽  
The Time Domain ◽  
Multi Access

Similar to the orthogonal frequency division multiple access (OFDMA) system, the carrier frequency offset (CFO) is a challenging problem in the single carrier frequency division multiple access (SC-FDMA) system, which can destroy the orthogonality among the subcarriers. As a consequence, multi-access interference (MAI) along with serious performance degradation will be induced. In this paper, a zero forcing (ZF)-based MAI cancellation scheme is proposed. Compared with other cancellation schemes, the proposed one mitigates the interferences in the time domain instead of the frequency domain. Simulation results show that the proposed method can significantly reduce the degradation and enhance the Bit Error Ratio (BER) performance.

scholarly journals Time-Domain Simulations of Single-Phase Enhanced PLL for Power Converters under Distorted Grid Conditions

2019 ◽  
Vol 8 (2) ◽  
pp. 3053-3057
Keyword(s):  
Time Domain ◽  
Single Phase ◽  
Phase Error ◽  
Frequency Tracking ◽  
Grid Voltage ◽  
Grid Synchronization ◽  
Distorted Grid ◽  
Phase Variations ◽  
Voltage Frequency ◽  
Mathematical Equations

With the developing number of alternate energy sources being connected to the Grid, there is a need for robust Grid synchronization technique that is capable enough despite the grid frequency and phase variations. Single phase Enhanced Phase Locked Loop (EPLL) presented in this paper meets these requirements. A detailed study of the performance of EPLL for disturbances in input grid voltage magnitude, phase and frequency is detailed through mathematical equations. Extensive simulations are carried out in Matlab/Simulink to analyze the phase and frequency tracking by EPLL. Dynamic response is examined carefully in terms of estimation of grid voltage, frequency and phase error

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