Apparatus and Method for Generating Signal According to Ifdma, and Apparatus for Receiving Signal
First Claim
1. A signal generation apparatus comprising:
- a first rotation unit for generating a rotated complex symbol group by rotating a plurality of complex symbols in a plurality of different phase angles each corresponding to a plurality of complex symbols;
a repetition unit for outputting a plurality of transmission chips by repeating the rotated complex symbol group at predetermined times; and
a second rotation unit for generating a plurality of transmission symbols by rotating the plurality of transmission chips in a plurality of phase angles included in an orthogonal phase sequence for respective users.
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Abstract
A signal generation apparatus and signal receiving apparatus according to an Interleaved Frequency Division Multiple Access scheme is provided. The signal generation apparatus generates a plurality of complex symbols by digital-modulating a plurality of data symbols, and rotates the generated plurality of complex symbols in a plurality of each different phase angles. The signal generation apparatus generates a plurality of transmission symbols by repeating a plurality of rotated complex symbols at predetermined times, and rotating the repeatedly generated plurality of transmission chips in phase angles of an orthogonal phase sequence for the respective users. When the signal receiving apparatus receives the plurality of transmission symbols generated as described above, the maximum diversity gain may be obtained.
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Citations
12 Claims
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1. A signal generation apparatus comprising:
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a first rotation unit for generating a rotated complex symbol group by rotating a plurality of complex symbols in a plurality of different phase angles each corresponding to a plurality of complex symbols; a repetition unit for outputting a plurality of transmission chips by repeating the rotated complex symbol group at predetermined times; and a second rotation unit for generating a plurality of transmission symbols by rotating the plurality of transmission chips in a plurality of phase angles included in an orthogonal phase sequence for respective users. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal generation method comprising:
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generating a plurality of complex symbols by digital-modulating a plurality of data symbols in M phase angles; generating a rotated complex symbol group by rotating the plurality of complex symbols in a plurality of different phase angles respectively corresponding to the plurality of complex symbols; generating a plurality of transmission chips by repeating the rotated complex symbol group at predetermined times; and generating a plurality of transmission symbols by rotating the plurality of transmission chips in phase angles of an orthogonal phase sequence for the respective users. - View Dependent Claims (8, 9)
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10. A signal receiving apparatus comprising:
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a receiving unit receiving a plurality of transmission symbols; a first inverse-rotation unit for generating a plurality of chips by inversely rotating a plurality of transmission symbols in phase angles of an orthogonal phase sequence for respective users; an addition unit for generating a plurality of complex symbols by adding the chips corresponding to the same data symbols among the plurality of chips; a second inverse-rotation unit for generating a plurality of inversely rotated complex symbols by inversely rotating the plurality of complex symbols in a plurality of different phase angles corresponding to each plurality of complex symbols; a digital demodulation unit for generating data symbols by digital-demodulating the plurality of inversely rotated complex symbols. - View Dependent Claims (11, 12)
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Specification