Method and apparatus for multiplexing data and control information in wireless communication systems based on frequency division multiple access

• US 20060262871A1
• Filed: 05/03/2006
• Published: 11/23/2006
• Est. Priority Date: 05/03/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Cho, Joon-Young, Lee, Ju-Ho, Kwon, Hwan-Joon, Cho, Yun-Ok
• Granted Patent: US 7,613,245 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

An apparatus for transmitting data in a frequency division multiple access based communication system is disclosed. The apparatus includes a symbol block generator for generating a symbol block in a predetermined symbol block period within one TTI when control information to be transmitted exists in the TTI, an FFT unit for performing FFT on the symbol block, and an IFFT unit for performing IFFT on signals output from the FFT unit and then transmitting the signals. The symbol block includes the control information and data to be transmitted. The TTI includes multiple symbol block periods.

Claims

1. An apparatus for transmitting data in a frequency division multiple access based communication system, the apparatus comprising:

a symbol block generator for generating a symbol block in a symbol block period within one Transmission Time Interval (TTI) when control information to be transmitted exists in the TTI, wherein the symbol block comprises the control information and data to be transmitted and the TTI comprises multiple symbol block periods;

a Fast Fourier Transform (FFT) unit for performing FFT on the symbol block; and

an Inverse Fast Fourier Transform (IFFT) unit for performing IFFT on signals output from the FFT unit and then transmitting the signals.

2. The apparatus as claimed in claim 1, wherein the control information comprises at least one of modulation information of the transmission data, channel coding information, symbol number-related information, and FFT mapping information.

3. The apparatus as claimed in claim 1, wherein the symbol block generator generates symbol blocks comprising at least one of data and pilot signals in the other symbol block periods within the TTI.

4. A method for transmitting data in a frequency division multiple access based communication system, the method comprising:

generating a symbol block in a symbol block period within one Transmission Time Interval (TTI) when control information to be transmitted exists in the TTI wherein the symbol block comprises the control information and data to be transmitted and the TTI comprises multiple symbol block periods;

performing Fast Fourier Transform (FFT) on the symbol block; and

performing Inverse Fast Fourier Transform (IFFT) on the FFTed signals and then transmitting the IFFTed signals.

5. The method as claimed in claim 4, wherein the control information comprises at least one of modulation information, channel coding information, symbol number-related information, and FFT mapping information.

6. The method as claimed in claim 4, wherein, during the generating, symbol blocks comprising at least one of data and pilot signals are generated in the other symbol block periods within the TTI.

7. An apparatus for receiving data in a frequency division multiple access based communication system, the apparatus comprising:

a Fast Fourier Transform (FFT) unit for receiving signals received during one symbol block period and for performing FFT on the signals;

an Inverse Fast Fourier Transform (IFFT) unit for performing IFFT on the signals output from the FFT unit, thereby restoring symbol blocks;

a control information demodulator/decoder for, when the symbol block period comprises a symbol block period in which data and control information are multiplexed, receiving modulation symbols corresponding to IFFT output indexes from among the symbol blocks and demodulating and decoding the modulation symbols, thereby outputting control information; and

a data demodulator/decoder for receiving modulation symbols corresponding to the other IFFT output indexes except for indexes corresponding to the control information from among the symbol blocks by using the control information, demodulating and decoding the received modulation symbols, and then outputting the data.

8. The apparatus as claimed in claim 7, further comprising:

a channel estimator for generating channel estimation information by using pilot symbols output from the FFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

a channel compensator for channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the IFFT unit.

9. The apparatus as claimed in claim 7, further comprising:

a channel estimator for generating channel estimation information by using pilot symbols output from the IFFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

a channel compensator for channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the IFFT unit.

10. The apparatus as claimed in claim 7, further comprising:

a channel estimator for generating channel estimation information by using pilot symbols output from the IFFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

a channel compensator for channel-compensating the symbol block comprising data and control information output from the IFFT unit by using the channel estimation information and then outputting the symbol block to the demodulator.

11. The apparatus as claimed in claim 7, further comprising:

a channel estimator for generating channel estimation information by using pilot symbols output from the IFFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

a channel compensator for channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the demodulator.

12. The apparatus as claimed in claim 7, wherein the control information comprises at least one of modulation information, channel coding information, symbol number-related information, and FFT mapping information.

13. The apparatus as claimed in claim 7, wherein, when the symbol block period comprises a symbol block period comprising data, the data demodulator/decoder receives symbol blocks comprising the data from the IFFT unit and then demodulates and decodes the symbol blocks, thereby outputting the data.

20. The method as claimed in claim 7, wherein, during the receiving of modulation symbols, when the symbol block period comprises a symbol block period comprising data, symbol blocks comprising the data are provided from the IFFT unit and are then demodulated and decoded, whereby the data is output.

14. A method for receiving data in a frequency division multiple access based communication system, the method comprising:

receiving signals received during one symbol block period and performing Fast Fourier Transform (FFT) on the signals by an FFT unit;

restoring symbol blocks from the FFTed signals by an Inverse Fast Fourier Transform (IFFT) unit;

when the symbol block period comprises a symbol block period in which data and control information are multiplexed, receiving modulation symbols corresponding to IFFT output indexes from among the symbol blocks from the IFFT unit and demodulating and decoding the modulation symbols, thereby outputting control information; and

receiving modulation symbols corresponding to the other IFFT output indexes except for indexes corresponding to the control information from among the symbol blocks from the IFFT unit by using the control information, demodulating and decoding the received modulation symbols, and then outputting the data.

15. The method as claimed in claim 14, further comprising:

generating channel estimation information by using pilot symbols output from the FFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the IFFT unit.

16. The method as claimed in claim 14, further comprising:

generating channel estimation information by using pilot symbols output from the IFFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the IFFT unit.

17. The method as claimed in claim 14, further comprising:

generating channel estimation information by using pilot symbols output from the FFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

channel-compensating the symbol block comprising data and control information output from the IFFT unit by using the channel estimation information and then outputting the symbol block to the demodulator.

18. The method as claimed in claim 14, further comprising:

generating channel estimation information by using pilot symbols output from the IFFT unit when the symbol block period comprises a symbol block period comprising a pilot signal; and

channel-compensating the symbol block comprising data and control information output from the FFT unit by using the channel estimation information and then outputting the symbol block to the demodulator.

19. The method as claimed in claim 14, wherein the control information comprises at least one of modulation information, channel coding information, symbol number-related information, and FFT mapping information.