Pre-processing systems and methods for MIMO antenna systems

• US 20080137635A1
• Filed: 12/12/2006
• Published: 06/12/2008
• Est. Priority Date: 12/12/2006
• Status: Active Grant

• Current Assignee: Meta Platforms, Inc. (f/k/a Facebook, Inc.)
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Pan, Zhen Gang, Zhao, Xue Yuan
• Granted Patent: US 8,031,795 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0673 using feedback from receiving side
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0019 in which mode-switching is based on a statistical approach
• CPC Class Codes: H04L 1/0023 characterised by the signalling
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0631 Receiver arrangements

Abstract

A method for controlling a Multiple Input Multiple Output (MIMO) antenna system comprises at a first communication unit, receiving a table from a second communication unit, the table including a plurality of space time processing schemes based on predicted channel state information, selecting at least one of the schemes from the table, and transmitting data from the first communication unit to the second communication unit according to the at least one selected space time processing scheme.

Claims

1. A method for controlling a Multiple Input Multiple Output (MIMO) antenna system, the method comprising:

at a first communication unit, receiving a table from a second communication unit, said table including a plurality of space time processing schemes based on predicted channel state information;

selecting at least one of said schemes from said table; and

transmitting data from said first communication unit to said second communication unit according to said at least one selected space time processing scheme.

2. The method of claim 1 wherein said schemes in said table are organized by respective time period to which each corresponds, and wherein said selecting comprises:

selecting said at least one scheme based on its respective time period.

3. The method of claim 1 wherein said transmitting comprises:

applying a Space Time Block Coding (STBC) technique to said transmission.

4. The method of claim 1 wherein said schemes in said table are organized by respective reliability values to which each corresponds, and wherein said selecting comprises:

selecting said at least one scheme based on its respective reliability value.

5. The method of claim 1 wherein said transmitting data comprises:

selecting one or more of a plurality of antennas in said first communication unit based upon control information in said at least one scheme; and

transmitting said data using said selected one or more antennas.

6. The method of claim 1 wherein said channel state information includes information selected from the list consisting of:

amplitude; and

phase rotation.

7. The method of claim 1 wherein said transmitting is performed in accordance with a Frequency Division Duplexing (FDD) method.

8. The method of claim 1 wherein said first communication unit is a transmitter communicating on a forward link channel, and said second communication unit is a receiver communicating on a reverse link channel.

9. A method for controlling a Multiple Input Multiple Output (MIMO) antenna system, the method comprising:

at a first communication unit of said MIMO antenna system, obtaining transmit channel state information from a burst from a second communication unit;

predicting likely transmit channel state information for a plurality of time points in the future based at least in part on said obtained transmit channel state information;

generating a table of space time processing schemes based at least in part upon said transmit channel state information for a plurality of time points in the future; and

sending said table to said second communication unit of said MIMO antenna system.

10. The method of claim 9 wherein said obtaining comprises:

estimating said transmit channel state information.

11. The method of claim 9 wherein said table is arranged by said plurality of time points.

12. The method of claim 11 wherein said obtained channel state information corresponds to a time, t, and wherein said each of said plurality of time points corresponds to a time offset from time t.

13. The method of claim 9 wherein each of said schemes corresponds to a respective time point and a respective reliability value, and wherein said table is organized by reliability value.

14. The method of claim 9 wherein each of said space time processing schemes is represented in the table by a matrix identifying one or more transmit antennas in said second communication unit for use in a subsequent transmission.

15. The method of claim 9 further comprising the following actions performed at said second communication unit of said MIMO antenna system:

selecting at least one of said space time processing schemes from said table; and

transmitting data based at least in part on control information in said selected space time processing scheme.

16. The method of claim 9 wherein said first communication unit is a receiver communicating on a reverse link channel, and said second communication unit is a transmitter communicating on a forward link channel.

17. A Multiple Input Multiple Output (MIMO) antenna system, said MIMO antenna system comprising:

communication unit including;

a plurality of antennas;

a receive unit operable to receive a table of space time processing schemes and further operable to select one of said schemes from said table; and

a control unit operable to transmit data using said plurality of antennas according to said selected space time processing scheme.

18. The MIMO antenna system of claim 17 wherein each of said schemes identifies one or more of said plurality of antennas for use in transmitting said data.

19. The MIMO antenna system of claim 17 wherein each of said schemes is based upon predicted channel state information for said communication unit.

20. The MIMO antenna system of claim 17, wherein said communication unit is a MIMO transmitter operable to transmit said data on a forward link.

21. The MIMO antenna system of claim 17 wherein said receive unit is operable to select one of said schemes based upon a desired reliability value associated with said one of said schemes.

22. The MIMO antenna system of claim 17 wherein said receive unit is operable to select one of said schemes based upon a time offset from a reference time, said time offset associated with said one of said schemes.

23. A Multiple Input Multiple Output (MIMO) antenna system, said MIMO antenna system comprising:

a first communication unit including;

a plurality of antennas operable to receive transmissions from a corresponding MIMO second communication unit;

an estimation unit operable to estimate future channel state information from said transmissions;

a table unit operable to construct tables of control information entries, each of said entries based at least in part on said estimated future channel state information; and

a transmission unit operable to send said tables to said corresponding MIMO second communication unit.

24. The MIMO antenna system of claim 23 wherein said first communication unit is a MIMO receiver operable to send data bursts on a reverse link, and said second communication unit is a transmitter operable to communicate on a forward link.

25. The MIMO antenna system of claim 23 wherein said estimation unit is operable to generate a plurality of future channel state information entries, each of said future channel state information entries corresponding to a respective time offset from a reference time point and corresponding to a respective reliability value.

26. The MIMO antenna system of claim 25 wherein said table unit is operable to construct said tables indexed by respective reliability values.

27. The MIMO antenna system of claim 25 wherein said table unit is operable to construct said tables indexed by respective time offset.