OFDM-based device and method for performing synchronization in the presence of interference signals
AssigneeAmicus Wireless Technology Ltd.
InventorsJingnong Yang, Won-Joon Choi
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Abstract
An OFDM-based device and method for performing synchronization utilizes a time-domain preamble of an incoming OFDM-based signal to compute an estimated fine frequency offset. The computation of the estimated fine frequency offset involves multiplying values of the time-domain preamble with conjugates of corresponding values of a selected base station time-domain preamble, averaging the resulting multiplied values in predefined segments and self-correlating the resulting averaged values to derive a self-correlation value, which is used to compute the estimated fine frequency offset.
Claims20
A method for performing synchronization in an OFDM-based device, the method comprising:
- receiving an incoming OFDM-based signal with a time-domain preamble having first, second and third slots;
- multiplying values of the time-domain preamble with conjugates of corresponding values of a selected base station time-domain preamble to produce an output set of multiplied values having first, second and third slots;
- averaging the multiplied values in predefined segments of the output set to produce averaged values;
- self-correlating the averaged values corresponding to one of the first, second and third slots of the output set with the averaged values corresponding to another slot of the output set to derive a self-correlation value;
- and
- computing an estimated fine frequency offset with respect to the incoming OFDM-based signal using the self-correlation value.
An OFDM-based device comprising:
- a fine frequency offset estimator configured to estimate fine frequency offset using an incoming OFDM-based signal with a time-domain preamble having first, second and third slots, the fine frequency offset estimator comprising:
- a multiplying unit configured to multiply values of the time-domain preamble with conjugates of corresponding values of a selected base station time-domain preamble to produce an output set of multiplied values having first, second and third slots;
- an averaging unit configured to average the multiplied values in predefined segments of the output set to produce averaged values;
- a correlation unit configured to self-correlate the averaged values corresponding to one of the first, second and third slots of the output set with the averaged values corresponding to another slot of the output set to derive a self-correlation value;
- and
- a computing unit configured to compute an estimated fine frequency offset with respect to the incoming OFDM-based signal using the self-correlation value.
Dependencies are inferred from the claim text.