Method for estimating the characteristcs of OFDM signals
First Claim
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1. Method of using a terminal of a cognitive radio system to determine the presence of an OFDM signal within a signal the terminal has received, the method comprising:
- calculating, by the terminal, a plurality of cyclic correlation coefficients (ρ
k/(α
+β
)(α
)) for the received signal for a correlation time difference (α
) and a plurality of cyclic frequencies
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Abstract
This invention relates to a method for determining at least one characteristic of an OFDM signal within a received signal, characterized in that:
- a plurality of cyclic correlation coefficients (ρk/(α+β)(α)) for the received signal is calculated (420, 520) for a correlation time difference (α) and a plurality of cyclic frequencies
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- a discrimination function is calculated (430, 530) as a function of the amplitude of said cyclic correlation coefficients;
- said OFDM signal characteristic is deduced (440, 561, 562) as a function of at least one value of said discrimination function.
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Citations
19 Claims
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1. Method of using a terminal of a cognitive radio system to determine the presence of an OFDM signal within a signal the terminal has received, the method comprising:
calculating, by the terminal, a plurality of cyclic correlation coefficients (ρ
k/(α
+β
)(α
)) for the received signal for a correlation time difference (α
) and a plurality of cyclic frequencies- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 19)
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11. Method of using a terminal of a cognitive radio system to determine a time parameter of the OFDM signal in a signal the terminal has received, the method comprising:
calculating, by the terminal, a plurality of cyclic correlation coefficients (ρ
k/(α
+β
)(α
)) for the received signal is calculated for a correlation time difference (α
) and a plurality of cyclic frequencies- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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