Transmitting spread signal in communication system

• US 8,774,297 B2
• Filed: 03/10/2011
• Issued: 07/08/2014
• 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, Roh, Dong Wook, Lee, Dae Won, Ahn, Joon Kui
• Primary Examiner(s): Burd, Kevin M
• Application Number:
  US13/045,455
• Publication Number:
  US 20110158292A1
• Time in Patent Office: 1,216 Days
• Field of Search: 375/259, 375/260, 375/267, 370/342
• 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 Acknowledgement/Negative acknowledgement (ACK/NACK) information in a mobile communication system, the method performed by a base station and comprising:

transmitting a first signal including first spread ACK/NACK information in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information existing only in a first antenna set in a form as shown in an upper half of Table 1; and

transmitting a second signal including second spread ACK/NACK information in an OFDM symbol, the second spread ACK/NACK information existing only in a second antenna set in a form as shown in a lower half of Table 1;

2. The method of claim 1, wherein the four available neighboring subcarriers for the first spread ACK/NACK information and the four available neighboring subcarriers for the second spread ACK/NACK information exist on different OFDM symbols.

3. The method of claim 1, further comprising:

transmitting a third signal including third spread ACK/NACK information in an OFDM symbol, the third spread ACK/NACK information existing only in the first antenna set in a form as shown in the upper half of Table 1, in which a₁ to a₄ are replaced with c₁ to c₄, respectively, wherein c₁ to c₄ are elements of the third spread ACK/NACK information,

wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry identical ACK/NACK information, and

wherein the four available neighboring subcarriers for the first spread ACK/NACK information are separated from the four available neighboring subcarriers for the third spread ACK/NACK information by a plurality of subcarriers in a frequency domain.

4. The method of claim 1, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.

5. The method of claim 1, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.

6. A method of communicating in a mobile communication system comprising a user equipment (UE) and a base station (BS), the method comprising:

transmitting, by the BS, a first signal including first spread Acknowledgement/Negative acknowledgement (ACK/NACK) information in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information existing only in a first antenna set in a form as shown in an upper half of Table 1;

transmitting, by the BS, a second signal including second spread ACK/NACK information in an OFDM symbol, the second spread ACK/NACK information existing only in a second antenna set in a form as shown in a lower half of Table 1;

receiving, by the UE, the first signal from the first antenna set of the BS; and

receiving, by the UE, the second signal from the second antenna set of the BS;

7. The method of claim 6, wherein the four available neighboring subcarriers for the first spread ACK/NACK information and the four available neighboring subcarriers for the second spread ACK/NACK information exist on different OFDM symbols.

8. The method of claim 6, further comprising:

receiving, by the UE, a third signal including third spread ACK/NACK information in an OFDM symbol from the first antenna set of the BS, the third spread ACK/NACK information existing in a form as shown in the upper half of Table 1, in which a₁ to a₄ are replaced with c₁ to c₄, respectively, wherein c₁ to c₄ are elements of the third spread ACK/NACK information,

wherein the four available neighboring subcarriers for the first spread ACK/NACK information are separated from the four available neighboring subcarriers for the third spread ACK/NACK information by a plurality of subcarriers in a frequency domain.

9. The method of claim 6, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.

10. The method of claim 6, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.

11. A base station for use in a mobile communication system, the base station comprising:

a radio frequency unit configured to transmit a radio frequency signal; and

a processor operably coupled to the radio frequency unit and configured to control the radio frequency unit to;

transmit a first signal including first spread Acknowledgement/Negative acknowledgement (ACK/NACK) information in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information existing only in a first antenna set in a form as shown in an upper half of Table 1; and

transmit a second signal including second spread ACK/NACK information in an OFDM symbol, the second spread ACK/NACK information existing only in a second antenna set in a form as shown in a lower half of Table 1;

12. The base station of claim 11, wherein the four available neighboring subcarriers for the first spread ACK/NACK information and the four available neighboring subcarriers for the second spread ACK/NACK information exist on different OFDM symbols.

13. The base station of claim 11, wherein the processor is further configured to control the radio frequency unit to:

transmit a third signal including third spread ACK/NACK information in an OFDM symbol, the third spread ACK/NACK information existing only in the first antenna set in a form as shown in the upper half of Table 1, in which a₁ to a₄ are replaced with c₁ to c₄, respectively, wherein c₁ to c₄ are elements of the third spread ACK/NACK information,

wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry identical ACK/NACK information, and

wherein the four available neighboring subcarriers for the first spread ACK/NACK information are separated from the four available neighboring subcarriers for the third spread ACK/NACK information by a plurality of subcarriers in a frequency domain.

14. The base station of claim 11, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.

15. The base station of claim 11, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.

16. A mobile communication system including a user equipment (UE) and a base station (BS),

the BS comprising:

a first radio frequency unit configured to transmit a radio frequency signal; and

a first processor operably coupled to the first radio frequency unit and configured to control the first radio frequency unit to;

transmit a first signal including first spread Acknowledgement/Negative acknowledgement (ACK/NACK) information in an orthogonal frequency division multiplexing (OFDM) symbol, the first spread ACK/NACK information existing only in a first antenna set in a form as shown in an upper half of Table 1; and

transmit a second signal including second spread ACK/NACK information in an OFDM symbol, the second spread ACK/NACK information existing only in a second antenna set in a form as shown in a lower half of Table 1; and

the UE comprising;

a second radio frequency unit configured to receive a radio frequency signal; and

a second processor operatively coupled to the second radio frequency unit and configured to control the second radio frequency unit to;

receive the first signal from the first antenna set of the BS; and

receive the second signal from the second antenna set of the BS;

17. The mobile communication system of claim 16, wherein the four available neighboring subcarriers for the first spread ACK/NACK information and the four available neighboring subcarriers for the second spread ACK/NACK information exist on different OFDM symbols.

18. The mobile communication system of claim 16, wherein the second processor is further configured to control the second radio frequency unit to receive a third signal including third spread ACK/NACK information in an OFDM symbol from the first antenna set of the BS, the third spread ACK/NACK information existing in a form as shown in the upper half of Table 1, in which a₁ to a₄ are replaced with c₁ to c₄, respectively, wherein c₁ to c₄ are elements of the third spread ACK/NACK information,

wherein the first spread ACK/NACK information and the third spread ACK/NACK information carry identical ACK/NACK information, and

wherein the four available neighboring subcarriers for the first spread ACK/NACK information are separate from the four available neighboring subcarriers for the third spread ACK/NACK information by a plurality of subcarriers in a frequency domain.

19. The mobile communication system of claim 16, wherein antennas A and B are first two contiguously numbered antennas, and antennas C and D are second two contiguously numbered antennas.

20. The mobile communication system of claim 16, wherein antennas A and B are odd-numbered antennas, and antennas C and D are even-numbered antennas.