TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM

• US 20110116564A1
• Filed: 01/24/2011
• Published: 05/19/2011
• 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, Daewon, Lee, Jung Hoon, Kim, Ki Jun, Ahn, Joon Kui, Roh, Dong Wook
• Granted Patent: US 8,018,984 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/709718 Determine interference
• CPC Class Codes: H04B 7/0413 MIMO systems
• 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 1/0643 block codes
• CPC Class Codes: H04L 1/1621 Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• 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 5/0026 Division using four or more dimensions
• 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 spreading a first signal using a plurality of spreading codes, multiplexing the first spread signal by code division multiplexing, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a first antenna set, spreading a second signal using a plurality of spreading codes, multiplexing the second spread signal by code division multiplexing, transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a second antenna set, and transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the second antenna set, wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the second multiplexed signal is transmitted on.

Claims

1. An apparatus configured to transmit a spread signal in a mobile communication system, the apparatus comprising:

a plurality of antennas;

a radio frequency unit; and

a processor,

wherein the processor is configured to;

spread a first signal using a plurality of spreading codes, having a spreading factor,

multiplex the first spread signal by code division multiplexing,

transmit the first multiplexed signal via a plurality of neighboring frequency resources of an orthogonal frequency division multiplexing (OFDM) symbol of a first antenna set,

spread a second signal using a plurality of spreading codes, having a spreading factor,

multiplex the second spread signal by code division multiplexing,

transmit the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set,

transmit the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a second antenna set, and

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

wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources on which the second multiplexed signal is transmitted.

2. The apparatus of claim 1, wherein the first multiplexed signal and the second multiplexed signal are respectively transmitted on two neighboring frequency resources.

3. The apparatus of claim 1, wherein the spreading factor is 2.

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

5. The apparatus of claim 4, wherein the first antenna set comprises two antennas.

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

7. The apparatus of claim 6, wherein the second antenna set comprises two antennas.

8. The apparatus of claim 1, wherein the multiplexed signals transmitted via the first antenna set and the multiplexed signals transmitted via the second antenna set are transmitted via respectively different frequency resources.

9. The apparatus of claim 1, wherein the multiplexed signals transmitted via the first antenna set and the multiplexed signals transmitted via the second antenna set are transmitted via respectively different OFDM symbols.

10. The apparatus of claim 1, wherein the first multiplexed signal and the second multiplexed signal are transmitted alternately by the first antenna set and the second antenna set via independent frequency resources repeatedly.

11. The apparatus of claim 10, wherein the first multiplexed signal and the second multiplexed signal are transmitted a total of three times using the first antenna set and the second antenna set alternately.

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

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

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

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

16. The apparatus of claim 1, wherein the first antenna set and the second antenna set respectively comprise one antenna.

17. The apparatus of claim 1, wherein the first signal and the second signal are ACK/NACK signals for indicating whether uplink data is successfully received.