Apparatus and method for detecting ranging signal in an orthogonal frequency division multiple access mobile communication system
First Claim
1. A base station apparatus in a broadband mobile communication system, comprising:
- a ranging subchannel extractor for extracting subcarrier values with a ranging signal from a fast Fourier transform (FFT) signal;
a plurality of multipliers for code-demodulating the subcarrier values by multiplying the subcarrier values by a plurality of ranging codes;
a plurality of correlators, each for calculating a plurality of differential correlations in a code-demodulated signal received from a corresponding multiplier;
a plurality of inverse fast Fourier transform (IFFT) processors, each for IFFT-processing differential correlations received from a corresponding correlator by mapping the differential correlations to predetermined subcarriers; and
a plurality of maximum value detectors, each for detecting a maximum value in an IFFT signal received from a corresponding IFFT processor and calculating a timing offset using an IFFT output index having the maximum value.
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Abstract
An apparatus and method for receiving a ranging signal in an OFDMA mobile communication system are provided. The ranging signal receiving apparatus including, a ranging subchannel extractor for extracting subcarrier values with a ranging signal from a (FFT) signal; a plurality of multipliers for code-demodulating the sub-carrier values by multiplying them by a plurality of ranging codes; each of a plurality of correlators for calculating a plurality of differential correlations in a code-demodulated signal received from a corresponding multiplier; each of a plurality of inverse fast Fourier transform (IFFT) processors for IFFT-processing differential correlations received from a corresponding correlator by mapping the differential correlations to predetermined subcarriers and each of a plurality of maximum value detectors for detecting a maximum value in an IFFT signal received from a corresponding IFFT processor and calculating a timing offset using an IFFT output index having the maximum value.
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Citations
24 Claims
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1. A base station apparatus in a broadband mobile communication system, comprising:
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a ranging subchannel extractor for extracting subcarrier values with a ranging signal from a fast Fourier transform (FFT) signal;
a plurality of multipliers for code-demodulating the subcarrier values by multiplying the subcarrier values by a plurality of ranging codes;
a plurality of correlators, each for calculating a plurality of differential correlations in a code-demodulated signal received from a corresponding multiplier;
a plurality of inverse fast Fourier transform (IFFT) processors, each for IFFT-processing differential correlations received from a corresponding correlator by mapping the differential correlations to predetermined subcarriers; and
a plurality of maximum value detectors, each for detecting a maximum value in an IFFT signal received from a corresponding IFFT processor and calculating a timing offset using an IFFT output index having the maximum value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiving method in a base station in a broadband mobile communication system, comprising the steps of:
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extracting subcarrier values with a ranging signal from a fast Fourier transform (FFT) signal;
code-demodulating the sub-carrier values by multiplying the subcarrier values by a plurality of ranging codes and forming code-demodulated signals;
calculating a plurality of differential correlations in each of the code-demodulated signals;
inverse fast Fourier transform (IFFT)-processing the differential correlations for each of the plurality of ranging codes by mapping the differential correlations to predetermined subcarriers and outputting IFFT signals; and
detecting a maximum value in each of the IFFT signals and calculating a timing offset using an IFFT output index having the maximum value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for estimating a timing offset in a broadband mobile communication system, comprising:
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a channel extractor for extracting subcarrier values of a predetermined channel from a fast Fourier transform (FFT) signal;
a correlator for calculating a plurality of differential correlations from the subcarrier values;
an inverse fast Fourier transform (IFFT) processor for IFFT-processing the differential correlations by mapping the differential subcarriers to predetermined subcarriers and outputting an IFFT signal; and
a maximum value detector for detecting a maximum value from the IFFT signal and estimating a timing offset using an IFFT output index having the maximum value. - View Dependent Claims (16, 17, 18, 19)
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20. A method of estimating a timing offset in a broadband mobile communication system, comprising the steps of:
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extracting subcarrier values of a predetermined channel from a fast Fourier transform (FFT) signal;
calculating a plurality of differential correlations from the subcarrier values;
inverse fast Fourier transform (IFFT)-processing the differential correlations by mapping differential subcarriers to predetermined subcarriers and outputting an IFFT signal; and
detecting a maximum value from the IFFT signal and estimating a timing offset using an IFFT output index having the maximum value. - View Dependent Claims (21, 22, 23, 24)
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Specification