A frequency tracking module (108) measures the residual frequency error present in the baseband signal.
Methods and apparatus for frequency tracking of a received signal.
In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols.
For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate.
The present invention provides a frequency tracking and compensation system and methods for minimizing the frequency offset between remote (10) and local units (20) of a communications system.
A tracking band-pass filter (52) extracts the center frequency component corresponding to the spatial frequency of a spatial filter, and an amplitude measuring circuit (54) measures the intensity (Da) of the component.
The portable frequency spectrum digital satellite-tracking device has the power supply unit itself and can locate the satellite accurately.
A tracking low-pass filter (55) and an amplitude measuring circuit (56) measure the intensities (Db) of low-frequency components corresponding to spatial frequencies lower than that of the spatial filter.
A satellite receiver system (400) provides acquisition and frequency tracking of a Doppler-shifted radio signal received from an orbiting satellite.
A maximum amplitude signal is forwarded by the signal processing portions to a frequency tracker of the navigation system.
In some cases, soft decisions are generated for the non-pilot symbols and then used with the pilot symbols for frequency tracking.
An evaluator (EVAL) of the frequency tracking device (FTD) determines a frequency deviation estimate (foff,est) on the basis of the selected M subcarriers and the selected M channel coefficients.
Systems and methodologies are described that facilitate computing discriminator signals for frequency tracking in wireless communications.
Frequency tracking (410, 420, 425, 430) is provided with only a single time reference, by tracking the time of reception of various time-elements.
The lower bandwidth controller mode may keep the noise level lower and provide better frequency tracking stability to the tunable laser.
The method includes analyzing one or more channel conditions from a wireless communication and automatically adjusting a frequency tracking loop gain or a time tracking loop gain in view of the channel conditions.
Frequency tracking (22) of structural resonant modes of vibration along with compensation for environmental effects (16), can readily yield changes in stiffness of the composite structure (10).
In one embodiment, the invention is directed toward frequency tracking techniques using both the pilot and non-pilot symbols.
The present invention is a novel and improved method and system for performing the pilot frequency tracking operation for coherent demodulation in a system employing a gated pilot signal.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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