TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM

• US 20100002754A1
• Filed: 06/13/2008
• Published: 01/07/2010
• Est. Priority Date: 06/13/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jung Hoon, Kim, Ki Jun, Ahn, Joon Kui, Lee, Dae Won, Roh, Dong Wook
• Granted Patent: US 7,953,169 B2
• Time in Patent Office: Days
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/068 using space frequency diversity space-frequency coding H04L1/0606
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861

Abstract

The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.

Claims

1. A method for transmitting a spread signal in a mobile communication system, the method comprising:

spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a certain spreading factor;

multiplexing the spread signal by code division multiplexing;

transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set; and

transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set,

wherein the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different frequency resources.

2. The method of claim 1, wherein the multiplexed signal is transmitted on four neighboring frequency resources.

3. The method of claim 1, wherein the certain spreading factor is 4.

4. The method of claim 1, wherein the certain spreading factor is equal to the number of neighboring frequency resources.

5. The method of claim 1, wherein the first antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol.

6. The method of claim 5, wherein the first antenna set comprises two antennas.

7. The method of claim 1, wherein the second antenna set is space frequency block coded by applying a space frequency block code to each neighboring pair of frequency resources of one OFDM symbol.

8. The method of claim 7, wherein the second antenna set comprises two antennas.

10. The method of claim 1, wherein the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via respectively different OFDM symbols.

11. The method of claim 1, wherein frequency switching transmitting diversity (FSTD) is applied in a way of transmitting the multiplexed signal alternately by the first antenna set and second antenna set repeatedly.

12. The method of claim 11, wherein the multiplexed signal is transmitted a total of 3 times using the first antenna set and second antenna set alternately.

13. The method of claim 1, wherein the first antenna set comprises a first antenna and a second antenna of a four-antenna group.

14. The method of claim 13, wherein the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.

15. The method of claim 1, wherein the first antenna set comprises a first antenna and a third antenna of a four-antenna group.

16. The method of claim 15, wherein the second antenna set comprises a second antenna and a fourth antenna of the four-antenna group.

17. The method of claim 1, wherein the spread signal is an ACK/NACK signal for indicating whether uplink data is successfully received or not.

9. (canceled)