Transmitting spread signal in communication system

• US 7,953,169 B2
• Filed: 06/13/2008
• Issued: 05/31/2011
• 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, Dae Won, Lee, Jung Hoon, Kim, Ki Jun, Ahn, Joon Kui, Roh, Dong Wook
• Primary Examiner(s): BURD, KEVIN MICHAEL
• Application Number:
  US12/139,254
• Publication Number:
  US 20100002754A1
• Time in Patent Office: 1,082 Days
• Field of Search: 375/130, 375/140, 375/146, 375/259, 375/260, 375/256, 375/295, 375/299
• US Class Current: 375/260
• 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 at a base station 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 spreading factor of 4;

coding the spread signal for multiple antenna transmission;

multiplexing the coded spread signal by code division multiplexing for each antenna;

transmitting the multiplexed signal via four neighboring frequency resources of one orthogonal frequency-division multiplexing (OFDM) symbol of a first antenna set comprising two antennas; and

transmitting the same multiplexed signal via four neighboring frequency resources of one OFDM symbol of a second antenna set comprising two antennas,

wherein the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are transmitted via different OFDM symbols,

wherein the multiplexed signal transmitted via the first antenna set and the multiplexed signal transmitted via the second antenna set are separated from each other by a plurality of subcarriers in a frequency domain,

wherein the spread signal is coded between the two antennas in each of the first antenna set and the second antenna set as shown in Table 1;

2. 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.

3. The method of claim 2, wherein the multiplexed signal is transmitted a total of 3 times using the first antenna set and second antenna set alternately.

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

5. The method of claim 4, wherein the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.

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

7. The method of claim 6, wherein the second antenna set comprises a second antenna and a fourth antenna of the four-antenna group.

8. A method for receiving a spread signal at a user equipment in a mobile communication system, the method comprising:

receiving a multiplexed signal via four neighboring frequency resources of one orthogonal frequency-division multiplexing (OFDM) symbol, the multiplexed signal being received from a first antenna set comprising two antennas of a transmitting end; and

receiving the same multiplexed signal via four neighboring frequency resources of one OFDM symbol, the same multiplexed signal being received from a second antenna set comprising two antennas of the transmitting end,

wherein the multiplexed signal received from the first antenna set and the multiplexed signal received from the second antenna set are received via different OFDM symbols,

wherein the multiplexed signal originates from a coded spread signal using code division multiplexing for each antenna,

wherein the coded spread signal originates from a spread signal coded between the two antennas in each of the first antenna set and the second antenna set as shown in Table 1;

9. The method of claim 8, wherein frequency switching transmitting diversity (FSTD) is applied in receiving the multiplexed signal alternately from the first antenna set and second antenna set repeatedly.

10. The method of claim 9, wherein the multiplexed signal is received a total of 3 times using the first antenna set and second antenna set alternately.

11. The method of claim 8, wherein the first antenna set comprises a first antenna and a second antenna of a four-antenna group.

12. The method of claim 11, wherein the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.

13. The method of claim 8, wherein the first antenna set comprises a first antenna and a third antenna of a four-antenna group.

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