Transmitting spread signal in communication system

• US 8,018,987 B2
• Filed: 08/03/2010
• Issued: 09/13/2011
• 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, Jung Hoon, Kim, Ki Jun, Ahn, Joon Kui, Roh, Dong Wook, Lee, Daewon
• Primary Examiner(s): Bocure; Tesfaldet
• Application Number:
  US12/849,759
• Publication Number:
  US 20100316148A1
• Time in Patent Office: 406 Days
• Field of Search: 375/130, 375/140, 375/141, 375/146, 375/147, 375/267, 375/299, 375/260, 375/347, 375/144, 375/148, 455/101, 455/132, 370/208, 370/210, 370/335, 370/320, 370/342, 370/441
• US Class Current: 375/148
• 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. A method for receiving a spread signal in a mobile communication system, the method comprising:

receiving a first multiplexed signal via a plurality of neighboring frequency resources of an orthogonal frequency division multiplexing (OFDM) symbol, the first multiplexed signal being transmitted from a first antenna set of a transmitting end,

wherein the first multiplexed signal is multiplexed from first spread signals by using code division multiplexing at the transmitting end,

wherein the first spread signals are spread by using a plurality of spreading codes at the transmitting end, the plurality of spreading codes having a spreading factor,

receiving a second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol, the second multiplexed signal being transmitted from the first antenna set of the transmitting end,

wherein the second multiplexed signal is multiplexed from second spread signals by using code division multiplexing at the transmitting end,

wherein the second spread signals are spread by using a plurality of spreading codes at the transmitting end, the plurality of spreading codes having a spreading factor;

receiving a third multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol, the third multiplexed signal being transmitted from a second antenna set of a transmitting end, wherein the third multiplexed signal carries same information as the first multiplexed signal; and

receiving a fourth multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol, the fourth multiplexed signal being transmitted from the second antenna set of the transmitting end, wherein the fourth multiplexed signal carries same information as the second multiplexed signal,

wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the second multiplexed signal is transmitted on, and

wherein the third multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the fourth multiplexed signal is transmitted on.

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

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

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

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

8. The method 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 method 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 method of claim 1, further comprising:

receiving a fifth multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of the first antenna set, wherein the fifth multiplexed signal carries same information as the first multiplexed signal; and

receiving a sixth multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set, wherein the sixth multiplexed signal carries same information as the second multiplexed signal,

wherein the fifth multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the sixth multiplexed signal is transmitted on.

11. The method of claim 1, 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 1, 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.

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

16. The method of claim 1, wherein the first signal and the second signal are ACK/NACK signals for indicating whether uplink data is successfully received or not.

17. A user equipment configured to receive a spread signal in a mobile communication system, the user equipment comprising:

a receiving module for receiving a first multiplexed signal via a plurality of neighboring frequency resources of an orthogonal frequency division multiplexing (OFDM) symbol, the first multiplexed signal being transmitted from a first antenna set of a transmitting end,

wherein the first multiplexed signal is multiplexed from first spread signals by using code division multiplexing at the transmitting end,

wherein the first spread signals are spread by using a plurality of spreading codes at the transmitting end, the plurality of spreading codes having a spreading factor,

wherein the receiving module receives a second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol, the second multiplexed signal being transmitted from the first antenna set of the transmitting end,

wherein the second multiplexed signal is multiplexed from second spread signals by using code division multiplexing at the transmitting end,

wherein the second spread signals are spread by using a plurality of spreading codes at the transmitting end, the plurality of spreading codes having a spreading factor,

wherein the receiving module receives a third multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol, the third multiplexed signal being transmitted from a second antenna set of a transmitting end, wherein the third multiplexed signal carries same information as the first multiplexed signal,

wherein the receiving module receives a fourth multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol, the fourth multiplexed signal being transmitted from the second antenna set of the transmitting end, wherein the fourth multiplexed signal carries same information as the second multiplexed signal, and

wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the second multiplexed signal is transmitted on, and

wherein the third multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the fourth multiplexed signal is transmitted on.

18. The user equipment of claim 17, wherein the first multiplexed signal and the second multiplexed signal are respectively transmitted on two neighboring frequency resources and the third multiplexed signal and the fourth multiplexed signal are respectively transmitted on two neighboring frequency resources.

19. The user equipment of claim 17, wherein the spreading factor is 2.

20. The user equipment of claim 17, 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.

21. The user equipment of claim 20, wherein the first antenna set comprises two antennas.

22. The user equipment of claim 17, 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.

23. The user equipment of claim 22, wherein the second antenna set comprises two antennas.

24. The user equipment of claim 17, 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.

25. The user equipment of claim 17, 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.

26. The user equipment of claim 25, wherein the second antenna set comprises a second antenna and a fourth antenna of the four-antenna group.

27. The user equipment of claim 17, wherein the receiving module further:

receives a fifth multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of the first antenna set, wherein the fifth multiplexed signal carries same information as the first multiplexed signal; and

receives a sixth multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set, wherein the sixth multiplexed signal carries same information as the second multiplexed signal,

wherein the fifth multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the sixth multiplexed signal is transmitted on.

28. The user equipment of claim 17, wherein the first antenna set comprises a first antenna and a second antenna of a four-antenna group.

29. The user equipment of claim 28, wherein the second antenna set comprises a third antenna and a fourth antenna of the four-antenna group.

30. The user equipment of claim 17, wherein the first antenna set comprises a first antenna and a third antenna of a four-antenna group.

31. The user equipment of claim 17, wherein the first antenna set and second antenna set respectively comprise one antenna.

32. The user equipment of claim 17, wherein the first signal and the second signal are ACK/NACK signals for indicating whether uplink data is successfully received or not.