Spread spectrum communication apparatus
First Claim
1. A spread spectrum communication apparatus comprising:
- frame synchronization pseudo-noise train generating means for generating a pseudo-noise train for frame synchronization;
reception frame timing generating means for outputting a reception frame timing signal necessary for reproduction of a reception frame and a reception synchronization word timing signal representative of an instant of time of insertion of the pseudo-noise train into said reception frame;
de-spread means for de-spreading a signal that is input into said de-spread means;
data reproducing means for producing reception reproduction data from an output signal of said de-spread means; and
frame synchronization correlation means, receiving the pseudo-noise train outputted from said frame synchronization pseudo-noise train generating means and the reception reproduction data outputted from said data reproducing means, for determining a value of correlation of the pseudo-noise train and the reception reproduction data and outputting a word correlation value when said value of correlation is not smaller than a reference value.
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Accused Products
Abstract
In a spread spectrum communication apparatus, frame synchronization is established by inserting data for frame synchronization as a part of a synchronization word of a transmission frame on a sending side and detecting the data for frame synchronization from reproduction data of a reception frame on a receiving side. A frame synchronization pseudo-noise train generator section generates a pseudo-noise train for frame synchronization used as the frame synchronization data. A frame synchronization correlator section receives the pseudo noise train for frame synchronization and reproduction data to output a signal when the value of correlation of the pseudo noise train for frame synchronization and the reproduction data is not smaller than a reference value. A reception frame timing generator section outputs a reception synchronization word timing signal with the output signal of the frame synchronization correlator section being taken as a reference.
46 Citations
4 Claims
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1. A spread spectrum communication apparatus comprising:
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frame synchronization pseudo-noise train generating means for generating a pseudo-noise train for frame synchronization; reception frame timing generating means for outputting a reception frame timing signal necessary for reproduction of a reception frame and a reception synchronization word timing signal representative of an instant of time of insertion of the pseudo-noise train into said reception frame; de-spread means for de-spreading a signal that is input into said de-spread means; data reproducing means for producing reception reproduction data from an output signal of said de-spread means; and frame synchronization correlation means, receiving the pseudo-noise train outputted from said frame synchronization pseudo-noise train generating means and the reception reproduction data outputted from said data reproducing means, for determining a value of correlation of the pseudo-noise train and the reception reproduction data and outputting a word correlation value when said value of correlation is not smaller than a reference value. - View Dependent Claims (2)
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3. A spread spectrum communication apparatus in which frame synchronization is established by inserting data for frame synchronization as a part of a synchronization word of a transmission frame on a sending side and detecting the data for frame synchronization from reproduction data of a reception frame on a receiving side, the spread spectrum communication apparatus comprising:
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frame synchronization pseudo-noise train generating means for generating a pseudo-noise train used as said data for frame synchronization; de-spread means for de-spreading a signal that is input into said de-spread means; data reproducing means for producing said reproduction data from an output signal of said de-spread means; frame synchronization correlation means, receiving the pseudo-noise train outputted from said frame synchronization pseudo-noise train generating means and the reproduction data, for determining a value of correlation of the pseudo-noise train for frame synchronization and the reproduction data and providing an output signal when said value of correlation is not smaller than a reference value; and reception frame timing generating means for outputting a reception synchronization word timing signal based on a reference signal comprising the output signal of said frame synchronization correlation means. - View Dependent Claims (4)
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Specification