Radiocommunication apparatus, radiocommunication system, and radiocommunication method
First Claim
1. A radiocommunication apparatus for attaining the synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, said radiocommunication apparatus comprising:
- an autocorrelation detection circuit for detecting the autocorrelation function of the reception signal;
a cross-correlation detection circuit connected in parallel with the autocorrelation detection circuit for detecting the cross-correlation function of the reception signal simultaneously with the detecting of the autocorrelation detection circuit; and
a synchronism attainment circuit for detecting the synchronism attainment signals contained in the reception signal based on the detected autocorrelation function from the autocorrelation detection circuit and on the detected cross-correlation function from the cross-correlation detection circuit, and thus attaining the synchronism.
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Abstract
A radiocommunication apparatus, a radiocommunication system, and a radiocommunication method adapted to a radio network system for attaining synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, in which the autocorrelation function of the reception signal and the cross-correlation function thereof are detected, and the synchronism attainment signals contained in the reception signal are detected based on the detected autocorrelation function and cross-correlation function. Consequently, a receiving side can reliably detect the synchronism attainment signals.
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Citations
20 Claims
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1. A radiocommunication apparatus for attaining the synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, said radiocommunication apparatus comprising:
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an autocorrelation detection circuit for detecting the autocorrelation function of the reception signal;
a cross-correlation detection circuit connected in parallel with the autocorrelation detection circuit for detecting the cross-correlation function of the reception signal simultaneously with the detecting of the autocorrelation detection circuit; and
a synchronism attainment circuit for detecting the synchronism attainment signals contained in the reception signal based on the detected autocorrelation function from the autocorrelation detection circuit and on the detected cross-correlation function from the cross-correlation detection circuit, and thus attaining the synchronism. - View Dependent Claims (2)
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3. A radiocommunication apparatus for attaining the synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, said radiocommunication apparatus comprising:
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an autocorrelation detection circuit for detecting the autocorrelation function of the reception signal and outputting an autocorrelation signal;
a cross-correlation detection circuit for detecting the cross-correlation function of the reception signal and outputting a cross-correlation signal;
a mask circuit for masking a predetermined component of the cross-correlation signal according to the autocorrelation signal; and
a synchronism attainment circuit for detecting the synchronism attainment signals contained in the reception signal according to the masked cross-correlation signal, and thus attaining the synchronism. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. A radiocommunication system comprising:
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a transmitting apparatus, said transmitting apparatus including;
a signal production circuit for producing a signal that contains a plurality of synchronism attainment signals representing the same pattern of bits, and transmitting means for transmitting the produced signal;
receiving means for receiving the signal transmitted from said transmitting means;
an autocorrelation detection circuit for detecting the autocorrelation function of the received signal;
a cross-correlation detection circuit connected in parallel with the autocorrelation detection circuit for detecting the cross-correlation function of the received signal simultaneously with the detecting of the autocorrelation function by the autocorrelation detection circuit; and
a synchronism attainment circuit for detecting the synchronism attainment signals contained in the received signal based on the detected autocorrelation function from the autocorrelation detection circuit and on the detected cross-correlation function from the cross-correlation detection circuit, and thus attaining the synchronism of the received signal relative to a reference signal. - View Dependent Claims (13)
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14. A radiocommunication method for attaining the synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, said radiocommunication method comprising the steps of:
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detecting the autocorrelation function of the reception signal;
detecting the cross-correlation function of the reception signal simultaneously with the step of detecting the autocorrelation function; and
detecting the synchronism attainment signals,contained in the reception signal based on the detected autocorrelation function detected in said step of detecting the autocorrelation function and based on the detected cross-correlation function detected in the step of detecting the cross-correlation function, and thus attaining the synchronism. - View Dependent Claims (15)
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16. A radiocommunication method for attaining the synchronism of a reception signal, which contains a plurality of synchronism attainment signals representing the same pattern of bits, relative to a reference signal, said radiocommunication method comprising the steps of:
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detecting the autocorrelation function of the reception signal and outputting an autocorrelation signal;
detecting the cross-correlation function of the reception signal and outputting a cross-correlation signal;
masking a predetermined component of the cross-correlation signal, which represents the cross-correlation functions of samples of the reception signal including the cross-correlation functions of the synchronism attainment signals, according to the autocorrelation signal; and
detecting the synchronism attainment signals contained in the reception signal according to the masked cross-correlation signal, and thus attaining the synchronism. - View Dependent Claims (17, 18, 19, 20)
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Specification