| 摘要 |
A receiving modem (20) including functionality for adjusting the synchronization of its timing relative to a transmitting modem (10), by recovering timing from a plurality of pilot tones transmitted by the transmitting modem (10) in a multicarrier modulation signal, is disclosed. For a subset of the pilot tones, the receiving modem (20) sums phase error differences, for example according to a weighted sum, to derive a phase error estimate relative to reference signals, in which noncoherent random noise cancels out, to correct for timing differences between the modems (10, 20). For another subset of the pilot tones not used in the phase error estimate, the receiving modem (20) analyzes the demodulated signal for those tones to adjust reference signals for each of those pilot tones. The adjusting is performed either by deriving an adjusted complex reference signal, or by adjusting coefficients in a frequency domain equalizer (28).
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