MOBILE COMMUNICATION SYSTEM, TRANSMITTING EQUIPMENT AND TRANSMISSION SIGNAL GENERATION METHOD
First Claim
1. A mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication, the system comprising:
- a transmitting equipment which performs signal processing on a signal for the predetermined sequence in a frequency region, converts the signal into a time region by inverse fast Fourier transform, thereafter cyclically shifts the sequence in the signal converted into the time region by a predetermined amount of shift, and transmits the cyclically shifted signal; and
a receiving equipment which computes the value of crosscorrelation between the signal received from the transmitting equipment and the sequence stored in advance, converts the crosscorrelation value into a time region by inverse fast Fourier transform, and detects the sequence used in the transmitting equipment and the amount of the cyclic shift on the basis of the crosscorrelation value in the time region.
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Accused Products
Abstract
A transmitting equipment is used in a mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication. An inverse fast Fourier transform device of the transmitting equipment converts a signal obtained by signal processing on a predetermined sequence in a frequency region into a time region by inverse fast Fourier transform. A cyclic shift device cyclically shifts by a predetermined amount of shift the sequence in the signal converted into the time region by the inverse fast Fourier transform device.
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Citations
14 Claims
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1. A mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication, the system comprising:
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a transmitting equipment which performs signal processing on a signal for the predetermined sequence in a frequency region, converts the signal into a time region by inverse fast Fourier transform, thereafter cyclically shifts the sequence in the signal converted into the time region by a predetermined amount of shift, and transmits the cyclically shifted signal; and
a receiving equipment which computes the value of crosscorrelation between the signal received from the transmitting equipment and the sequence stored in advance, converts the crosscorrelation value into a time region by inverse fast Fourier transform, and detects the sequence used in the transmitting equipment and the amount of the cyclic shift on the basis of the crosscorrelation value in the time region. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transmitting equipment used in a mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication, the transmitting equipment comprising:
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an inverse fast Fourier transform unit for converting a signal obtained by signal processing on the predetermined sequence in a frequency region into a time region by inverse fast Fourier transform; and
a cyclic shift unit for cyclically shifting by a predetermined amount of shift the sequence in the signal converted into the time region by the inverse fast Fourier transform unit. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A transmitting equipment used in a mobile communication system in which a signal obtained by cyclically shifting a predetermined sequence is used for communication, the transmitting equipment comprising:
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inverse fast Fourier transform means for converting a signal obtained by signal processing on the predetermined sequence in a frequency region into a time region by inverse fast Fourier transform; and
cyclic shift means for cyclically shifting by a predetermined amount of shift the sequence in the signal converted into the time region by the inverse fast Fourier transform means.
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14. A transmission signal generation method in a transmitting equipment used in a mobile communication system in which a predetermined sequence is cyclically shifted to be used for communication, the method comprising:
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performing signal processing on a predetermined sequence in a frequency region;
converting the signal in the frequency region processed by signal processing into a time region by inverse fast Fourier transform; and
cyclically shifting the sequence in the signal converted into the time region by a predetermined amount of shift.
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Specification