Pulse or digital communications – Receivers – Automatic frequency control
Patent
1994-08-25
1996-04-30
Chin, Stephen
Pulse or digital communications
Receivers
Automatic frequency control
36472419, 375233, 375232, 375340, H03H 730, H03H 740, H03K 5159, H04L 2706
Patent
active
055132219
ABSTRACT:
A device and method of adjusting an equalizer in a digital communications receiver in response to relative velocity between the communications receiver and a communications transmitter. A radio frequency receiver receives a radio frequency signal from the communications transmitter through a communications channel, and an analog to digital converter digitizes a first portion of the radio frequency signal during a first time period, and generates a first data signal made up of digital samples. The analog to digital converter also digitizes a second portion of the radio frequency signal during a second time period and generates a second data signal, also made up of samples. A channel estimator estimates characteristics of the communications channel in response to a portion of the first data signal, and generates a first channel estimate in response thereto. Finally, a processor determines an estimated velocity of the communications receiver relative to the communications transmitter, weights the first channel estimate in response to the estimated velocity, and generates a revised channel estimate in response to the weighting of the first channel estimate and the second data signal.
REFERENCES:
patent: 5263026 (1993-11-01), Parr et al.
patent: 5274670 (1993-12-01), Seizawa et al.
Huang et al, "A comparative study of two adaptive equalizers for mobile radio" Vehicular Technology, 1991 Conf. pp. 765-769.
Huynh Long
Parr Michael
Chin Stephen
Denson-Low Wanda K.
Hughes Aircraft Company
Lindeen III Gordon R.
Webster Bryan E.
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