Method of estimating sampling clock offset, a sampling clock offset estimator and a receiver comprising the same

摘要

A SCO estimator comprises the following units. A module obtains a first data output by a first unit and copies the first data to obtain copied data. A QAM unit quadrature modulates the copied data into each sub-carrier of each OFDM symbol to regenerate transmitted modulated data. A first phase unit obtains a first phase of each sub-carrier of each OFDM symbol of the modulated data. A second phase unit obtains a second data from a second unit, and obtains a second phase of each sub-carrier of each OFDM symbol of the second data. A comparator generates a comparing result according to the first phase and the second phase of each sub-carrier of each OFDM symbol. A divider divides the comparing result of each sub-carrier by the subcarrier index within each OFDM symbol and the OFDM symbol index of each OFDM symbol. An averaging unit averages the divided comparing result over number of sub-carriers and number of OFDM symbols.

主权项

1. A sampling clock offset estimator in a communication system, comprising:
a module, configured to obtain a first data output by a first unit and copy the first data to obtain copied data; a quadrature amplitude modulation (QAM) unit, configured to quadrature modulate the copied data into each sub-carrier of each OFDM symbol to regenerate transmitted modulated data; a first phase unit, configured to obtain a first phase of each sub-carrier of each OFDM symbol of the modulated data; a second phase unit, configured to obtain a second data from a second unit, and obtain a second phase of each sub-carrier of each OFDM symbol of the second data; a comparator, configured to generate a comparing result according to the first phase and the second phase of each sub-carrier of each OFDM symbol; a divider, configured to divide the comparing result of each sub-carrier by the subcarrier index within one OFDM symbol and further by the OFDM symbol index of each OFDM symbol when more than one OFDM symbols are used; and an averaging unit, configured to average the divided comparing result over number of sub-carriers.