| 摘要 |
A frequency tracking loop ( 100 ) includes: a mixer ( 122 ) for correcting frequency offset of an input radio signal that includes bursts of known data; a frequency offset estimator ( 134 ), for providing an estimate of frequency offset; a variable bandwidth filter ( 142 ), for providing a filtered signal; an oscillator ( 146 ) for supplying a second input of the mixer with a signal whose frequency depends on the filtered signal; the frequency tracking loop ( 100 ) is adapted to change the bandwidth of the variable bandwidth filter ( 142 ) in dependence on at least one characteristic of the currently received burst of known data. |
