DATA SYMBOL MAPPING FOR MULTIPLE-INPUT MULTIPLE-OUTPUT HYBRID AUTOMATIC REPEAT REQUEST

• US 20090262855A1
• Filed: 03/24/2009
• Published: 10/22/2009
• Est. Priority Date: 04/22/2008
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Lee, Jungwon, Lou, Hui-Ling, Nallapureddy, Bhaskar V.
• Granted Patent: US 8,279,963 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining

Abstract

A system includes an encoding module, a symbol selection module, a subcarrier selection module, and a mapping module. The encoding module receives symbols for transmission over K subcarriers and T antennas, encodes the symbols using a space time code, and generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1. The symbol selection module selects T adjacent ones of the symbols and selects STC versions of the T adjacent ones of the symbols. The subcarrier selection module selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols. The mapping module maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.

Claims

1. A system comprising:

an encoding module that receives symbols for transmission over K subcarriers and T antennas, that encodes the symbols using a space time code, and that generates space time coded (STC) versions of the symbols, where K and T are integers greater than 1;

a symbol selection module that selects T adjacent ones of the symbols and that selects STC versions of the T adjacent ones of the symbols;

a subcarrier selection module that selects one of the K subcarriers for transmitting the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols; and

a mapping module that maps the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers, respectively, and that maps the STC versions of the T adjacent ones of the symbols onto the T antennas for transmission over the selected one of the K subcarriers.

2. The system of claim 1, wherein the mapping module maps the T adjacent ones of the symbols onto the T antennas when the selected one of the K subcarriers is used at a first time, and wherein the mapping module maps the STC versions of the T adjacent ones of the symbols onto the T antennas when the selected one of the K subcarriers is used at a second time.

3. The system of claim 1, wherein the mapping module maps the T adjacent ones of the symbols onto the T antennas in a first order of the T antennas, and maps the STC versions of the T adjacent ones of the symbols onto the T antennas in a second order of the T antennas that is opposite of the first order.

4. The system of claim 1, wherein when one of the T adjacent ones of the symbols is mapped onto a first one of the T antennas, an STC version of the one of the T adjacent ones of the symbols is mapped onto a second one of the T antennas.

5. The system of claim 1, wherein the STC versions of the T adjacent ones of the symbols include complex conjugates of the T adjacent ones of the symbols.

6. The system of claim 1, wherein the symbols include orthogonal frequency division multiplexing (OFDM) symbols, and wherein the T antennas operate as multiple-input multiple-output (MIMO) antennas.

7. A transmitter comprising the system of claim I and further comprising:

the T antennas; and

T driver modules that drive the T antennas, respectively,

wherein the T driver modules transmit the T adjacent ones of the symbols over the selected one of the K subcarriers via the T antennas, respectively, and

wherein the T driver modules transmit the STC versions of the T adjacent ones of the symbols over the selected one of the K subcarriers via the T antennas.

8. A system comprising the transmitter of claim 7 and further comprising:

a receiver that includes;

a preprocessing module that receives the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols transmitted over the one of the K subcarriers, that decodes the STC versions of the T adjacent ones of the symbols, and that generates decoded symbols;

a combining module that combines the decoded symbols and corresponding ones of the T adjacent ones of the symbols; and

a decoding module that decodes the T adjacent ones of the symbols based on a combination of the decoded symbols and the corresponding ones of the T adjacent ones of the symbols.

9. A receiver comprising:

a preprocessing module that receives T adjacent symbols transmitted over a subcarrier via T antennas, respectively, where T is an integer greater than 1, that receives space time coded (STC) versions of the T adjacent symbols transmitted over the subcarrier via the T antennas, that decodes the STC versions of the T adjacent symbols, and that generates decoded symbols;

a combining module that combines the decoded symbols and corresponding ones of the T adjacent symbols; and

a decoding module that decodes the T adjacent symbols based on a combination of the decoded symbols and the corresponding ones of the T adjacent symbols.

10. A transmitter comprising:

a control module that selects first and second mapping modes to map symbols onto K subcarriers and T antennas during first and second transmissions of the symbols, respectively, where K and T are integers greater than 1;

a first mapping module that maps T adjacent ones of the symbols onto the T antennas for transmission over one of the K subcarriers, respectively, when the first mapping mode is selected; and

a second mapping module that maps the T adjacent ones of the symbols onto the T antennas for transmission over the one of the K subcarriers, respectively, and that maps space time coded (STC) versions of the T adjacent ones of the symbols onto the T antennas for transmission over the one of the K subcarriers when the second mapping mode is selected.

11. The transmitter of claim 10, wherein the second mapping module maps the T adjacent ones of the symbols onto the T antennas, respectively, when the one of the K subcarriers is used at a first time, and wherein the second mapping module maps the STC versions of the T adjacent ones of the symbols onto the T antennas when the one of the K subcarriers is used at a second time that occurs after the first time.

12. The transmitter of claim 10 wherein:

the T adjacent ones of the symbols are mapped onto the T antennas in a first order of the T antennas in the first and second mapping modes; and

the STC versions of the T adjacent ones of the symbols are mapped onto the T antennas in a second order of the T antennas in the second mapping mode, where the second order is opposite of the first order.

13. The transmitter of claim 10 wherein when one of the T adjacent ones of the symbols is mapped onto a first one of the T antennas in the second mapping mode, an STC version of the one of the T adjacent ones of the symbols is mapped onto a second one of the T antennas.

14. The transmitter of claim 10 wherein the STC versions of the T adjacent ones of the symbols include complex conjugates of the T adjacent ones of the symbols.

15. The transmitter of claim 10 wherein the symbols include orthogonal frequency division multiplexing (OFDM) symbols, and wherein the T antennas operate as multiple-input multiple output (MIMO) antennas.

16. The transmitter of claim 10 further comprising:

the T antennas; and

T driver modules that drive the T antennas, respectively,

wherein the T driver modules transmit the T adjacent ones of the symbols over the one of the K subcarriers via the T antennas, respectively, during the first and second transmissions, and

wherein the T driver modules transmit the STC versions of the T adjacent ones of the symbols over the one of the K subcarriers via the T antennas during the second transmission.

17. A system comprising the transmitter of claim 16 and further comprising:

a receiver that includes;

a preprocessing module that receives the T adjacent ones of the symbols transmitted over the one of the K subcarriers via the T antennas, respectively, during the first and second transmissions;

a combining module that combines the T adjacent ones of the symbols transmitted over the one of the K subcarriers via the T antennas during the first transmission with corresponding ones of the T adjacent ones of the symbols transmitted over the one of the K subcarriers via the T antennas during the second transmission; and

a decoding module that decodes the T adjacent ones of the symbols based on a combination of the T adjacent ones of the symbols transmitted over the one of the K subcarriers via the T antennas during the first and second transmissions.

18. A system comprising the transmitter of claim 16 and further comprising:

a receiver that includes;

a preprocessing module that receives the T adjacent ones of the symbols and the STC versions of the T adjacent ones of the symbols transmitted over the one of the K subcarriers during the second transmission, that decodes the STC versions of the T adjacent ones of the symbols, and that generates decoded symbols;

a combining module that combines the decoded symbols and corresponding ones of the T adjacent ones of the symbols; and

a decoding module that decodes the T adjacent ones of the symbols based on a combination of the decoded symbols and the corresponding ones of the T adjacent ones of the symbols.

19. A receiver comprising:

a preprocessing module that receives T adjacent symbols transmitted over a subcarrier via T antennas during a first transmission, respectively, where T is an integer greater than 1, and that receives the T adjacent symbols and space time coded (STC) versions of the T adjacent symbols transmitted over the subcarrier via the T antennas during a second transmission;

a combining module that combines the T adjacent symbols transmitted over the subcarrier via the T antennas during the first transmission with corresponding ones of the T adjacent symbols transmitted over the subcarrier via the T antennas during the second transmission; and

a decoding module that decodes the T adjacent symbols based on a combination of the T adjacent symbols transmitted over the subcarrier via the T antennas during the first and second transmissions.