| 摘要 |
In a multicarrier QAM system, a receiver comprises a data directed phase error estimator (21) which determines a phase rotation direction of each received complex QAM data value (YK) with respect to the complex default QAM data value (CK) used by a quantizer/decoder (11, 12) for decoding. The data directed phase error estimator (21) averages the phase rotation directions for all carriers and adjusts the phase of a sample frequency (fsampR) output by a numerically-controlled oscillator (15) on the basis of this overall average phase rotation direction value (D). Thus, an overall estimate of the missing phase synchronization to the sample frequency used in the transmitter can be obtained such that the data symbols can be more accurately decoded. |
