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Frequency tracking using variable loop gain in Rayleigh fading channels
Frequency tracking using variable loop gain in Rayleigh fading channels
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机译：在瑞利衰落信道中使用可变环路增益进行频率跟踪
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摘要
A frequency tracking apparatus using a variable loop gain in a Rayleigh fading channel environment includes a first component multiplier for multiplying a first component of a frequency with a predetermined first feedback control signal; A second component multiplier for multiplying a second component of the frequency with a predetermined second feedback control signal; A first low pass filter for passing only a predetermined first low frequency component among the signals from the first component multiplier; A second low-pass filter for passing only a predetermined second low-frequency component of the signal from the second component multiplier; A frequency sensing unit for sensing a predetermined frequency error component from the first and second low-pass filters; A signal level meter for measuring a predetermined frequency signal level from the first and second low-pass filters; A filter coefficient controller for controlling a predetermined loop filter coefficient according to a frequency signal level measured by the signal level measurer; A multiplexer for controlling and outputting a frequency signal level from the signal level measurer based on a loop filter coefficient from the filter coefficient controller; A frequency multiplier for multiplying the frequency error component sensed by the frequency sensing unit in proportion to the level of the frequency component output from the multiplexer; A loop filter for outputting a sum of frequency error components from the frequency multiplier by taking a previous value and an average; And a voltage control oscillator for outputting a first feedback control signal and a second feedback control signal in proportion to a voltage signal from the loop filter, wherein the signal level of the received frequency can be measured, and the signal level of the measured frequency The feedback coefficient of the error component of the reception frequency can be variably applied to track the frequency.
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