METHOD FOR SWITCHING BETWEEN A LONG GUARD INTERVAL AND A SHORT GUARD INTERVAL AND MODULE USING THE SAME
First Claim
1. A method for switching between a long guard interval and a short guard interval, comprising the steps of:
- receiving a first data symbol, the first data symbol including a cyclic preamble and an effective data;
generating a second data symbol in accordance with the cyclic preamble, the second data symbol including an effective data;
respectively measuring portions of the first and second data symbols to generate a first measurement value and a second measurement value; and
comparing the first and second measurement values with a threshold value to generate an output value, wherein the output value is used to choose a long guard interval or a short guard interval.
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Abstract
The module for switching between a long guard interval and a short guard interval comprises a signal processing unit, a measurement unit, a comparison unit and a switching unit. The module receives a first data symbol, and the data symbol has one of a long guard interval and a short guard interval. The signal processing unit is configured to generate a second data symbol in accordance with the first data symbol. The measurement unit is configured to measure a portion of the first and second data symbols in order to generate a first measurement value and a second measurement value. The comparison unit is configured to generate an output signal by comparing the first and second measurement values with a threshold value. The switching unit is configured to selectively switch guard intervals of subsequent data symbols in accordance with the output signal.
56 Citations
17 Claims
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1. A method for switching between a long guard interval and a short guard interval, comprising the steps of:
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receiving a first data symbol, the first data symbol including a cyclic preamble and an effective data; generating a second data symbol in accordance with the cyclic preamble, the second data symbol including an effective data; respectively measuring portions of the first and second data symbols to generate a first measurement value and a second measurement value; and comparing the first and second measurement values with a threshold value to generate an output value, wherein the output value is used to choose a long guard interval or a short guard interval. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for switching from a long guard interval to a short guard interval, comprising the steps of:
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receiving a preamble to generate a channel estimation parameter; calculating a cross-correlation of channels between adjacent subcarriers in accordance with the channel estimation parameter; determining whether the cross-correlation is greater than a threshold value; and switching guard intervals of subsequent data symbols to a short guard interval if the determination is affirmative. - View Dependent Claims (9, 10, 11)
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12. A module for switching between a long guard interval and a short guard interval, the module receiving a first data symbol, the data symbol having one of a long guard interval and a short guard interval, the module comprising:
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a signal processing unit configured to generate a second data symbol in accordance with the first data symbol; a measurement unit configured to measure portions of the first and second data symbols in order to generate a first measurement value and a second measurement value; a comparison unit configured to generate an output signal by comparing the first and second measurement values with a threshold value; and a switching unit configured to selectively switch guard intervals of subsequent data symbols in accordance with the output signal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification