Apparatus and Method for Generating Signal According to Ifdma, and Apparatus for Receiving Signal

• US 20080225895A1
• Filed: 08/22/2006
• Published: 09/18/2008
• Est. Priority Date: 08/22/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kwon, Dong-Seung, Oh, Jong-Ee, Lee, Seung-Joon
• Granted Patent: US 7,965,697 B2
• Time in Patent Office: Days
• US Class Current: 370/483
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 5/0016 Time-frequency-code

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.

Claims

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.

2. The signal generation apparatus of claim 1, further comprising a digital modulation unit for generating a plurality of complex symbols by digital-modulating a plurality of data symbols in M phase angles.

3. The signal generation apparatus of claim 2, wherein the first rotation unit generates the rotated complex symbol group by rotating a k-th complex symbol among the plurality of complex symbols in a phase angle that is inverse-proportional to M and proportional to k.

4. The signal generation apparatus of claim 3, wherein

the first rotation unit generates the rotated complex symbol group by rotating a k-th complex symbol among the plurality of complex symbols in a phase angle

5. The signal generation apparatus of claim 1, wherein the second rotation unit rotates an l-th transmission chip of the plurality of transmission chips in a phase angle that is proportional to the l and a user number.

6. The signal generation apparatus of claim 5, wherein the second rotation unit rotates an l-th transmission chip of the plurality of transmission chips in a phase angle

7. A signal generation method comprising:

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.

8. The signal generation method of claim 7, wherein the generating of the rotated complex symbol group includes generating the rotated complex symbol group by rotating a k-th complex symbol among the plurality of complex symbols in a phase angle that is inverse-proportional to M and proportional to k.

9. The signal generation method of claim 8, wherein the generating of the plurality of transmission symbol includes generating the plurality of transmission symbols by rotating an l-th transmission chip of the plurality of transmission chips in a phase angle proportional to the l and a user number.

10. A signal receiving apparatus comprising:

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.

11. The signal receiving apparatus of claim 10, wherein

the digital demodulation unit performs the digital demodulation using M phase angles, and

the second inverse-rotation unit generates the plurality of inversely complex symbols by rotating a k-th complex symbol among the plurality of complex symbols in a phase angle that is inverse-proportional to M and proportional to k.

12. The signal receiving apparatus of claim 11, wherein the first inverse-rotation unit inversely rotates an l-th transmission symbol of the plurality of transmission symbols in a phase angle proportional to the l and a user number.