Data rate adaptation in multiple-in-multiple-out systems

• US 8,861,499 B1
• Filed: 09/09/2013
• Issued: 10/14/2014
• Est. Priority Date: 02/14/2003
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Narasimhan, Ravi, Sampath, Hemanth
• Primary Examiner(s): Gonzalez, Amancio
• Application Number:
  US14/022,046
• Time in Patent Office: 400 Days
• Field of Search: 370/232, 370/329, 370/343, 370/352, 455/67.13, 455/101, 455/115.1, 455/452.2
• US Class Current: 370/343
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• 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

Abstract

Systems and techniques relating to wireless communication are described. A described technique includes transmitting a first signal wirelessly to a wireless communication device in accordance with a first transmit mode that is selected from a plurality of transmit modes; receiving a shortlist from the wireless communication device, the shortlist identifying a subset of the transmit modes, the subset of the transmit modes including two or more modes that are different from the first transmit mode; selecting a second transmit mode from the shortlist; transmitting a second signal wirelessly to the wireless communication device in accordance with the second transmit mode; and selectively cycling through any remaining modes of the shortlist based on a lack of reception of an acknowledgement to the second signal. The wireless communication device can be configured to generate the shortlist based on a channel quality analysis of a received version of the first signal.

Claims

1. An apparatus comprising:

circuitry configured to control a transmission of a first signal wirelessly to a wireless communication device in accordance with a first transmit mode that is selected from a plurality of transmit modes;

circuitry configured to receive a shortlist from the wireless communication device, the shortlist identifying a subset of the transmit modes, the subset of the transmit modes including two or more modes that are different from the first transmit mode, wherein the wireless communication device is configured to generate the shortlist based on a channel quality analysis of a received version of the first signal; and

circuitry configured to select a second transmit mode from the shortlist for a transmission of a second signal, and selectively cycle through any remaining modes of the shortlist based on a lack of reception of an acknowledgement to the second signal,

wherein the circuitry configured to control the transmission is configured to control a transmission of the second signal wirelessly to the wireless communication device in accordance with the second transmit mode or one of the remaining modes.

2. The apparatus of claim 1, wherein the plurality of transmit modes comprises different combinations of one or more of the following:

transmission signaling schemes, data rate, coding rate, modulation order, and modulation level.

3. The apparatus of claim 1, wherein the shortlist identifies one or more multiple-in-multiple-out (MIMO) transmission modes.

4. The apparatus of claim 1, wherein the channel quality analysis comprises determining at least one of a signal-to-noise ratio or signal-to-interference-and-noise ratio associated with the received version of the first signal.

5. The apparatus of claim 1, wherein the shortlist is included in an acknowledge (ACK) or no acknowledge (NACK) packet.

6. The apparatus of claim 1, wherein the shortlist comprises lookup table indices corresponding to the two or more modes.

7. The apparatus of claim 1, wherein the second transmit mode is selected based on having a highest data rate within the shortlist.

8. A method comprising:

transmitting a first signal wirelessly to a wireless communication device in accordance with a first transmit mode that is selected from a plurality of transmit modes;

receiving a shortlist from the wireless communication device, the shortlist identifying a subset of the transmit modes, the subset of the transmit modes including two or more modes that are different from the first transmit mode, wherein the wireless communication device is configured to generate the shortlist based on a channel quality analysis of a received version of the first signal;

selecting a second transmit mode from the shortlist;

transmitting a second signal wirelessly to the wireless communication device in accordance with the second transmit mode; and

selectively cycling through any remaining modes of the shortlist based on a lack of reception of an acknowledgement to the second signal.

9. The method of claim 8, wherein the plurality of transmit modes comprises different combinations of one or more of the following:

transmission signaling schemes, data rate, coding rate, modulation order, and modulation level.

10. The method of claim 8, wherein the shortlist identifies one or more multiple-in-multiple-out (MIMO) transmission modes.

11. The method of claim 8, wherein the channel quality analysis comprises determining at least one of a signal-to-noise ratio or signal-to-interference-and-noise ratio associated with the received version of the first signal.

12. The method of claim 8, wherein receiving the shortlist comprising receiving an acknowledge (ACK) or no acknowledge (NACK) packet.

13. The method of claim 8, wherein the shortlist comprises lookup table indices corresponding to the two or more modes.

14. The method of claim 8, wherein the second transmit mode is selected based on having a highest data rate within the shortlist.

15. A system comprising:

a transceiver configured to transmit a first signal wirelessly to a wireless communication device in accordance with a first transmit mode that is selected from a plurality of transmit modes and to receive a shortlist from the wireless communication device, the shortlist identifying a subset of the transmit modes, the subset of the transmit modes including two or more modes that are different from the first transmit mode, wherein the wireless communication device is configured to generate the shortlist based on a channel quality analysis of a received version of the first signal; and

a selector comprising circuitry configured to select a second transmit mode from the shortlist,

wherein the transceiver is configured to transmit a second signal wirelessly to the wireless communication device in accordance with the second transmit mode,

wherein the selector is configured to selectively cycle through any remaining modes of the shortlist based on a lack of reception of an acknowledgement to the second signal for a transmission of one or more third signals to the wireless communication device.

16. The system of claim 15, wherein the plurality of transmit modes comprises different combinations of one or more of the following:

transmission signaling schemes, data rate, coding rate, modulation order, and modulation level.

17. The system of claim 15, wherein the shortlist identifies one or more multiple-in-multiple-out (MIMO) transmission modes.

18. The system of claim 15, wherein the channel quality analysis comprises determining at least one of a signal-to-noise ratio or signal-to-interference-and-noise ratio associated with the received version of the first signal.

19. The system of claim 15, wherein the shortlist is included in an acknowledge (ACK) or no acknowledge (NACK) packet.

20. The system of claim 15, wherein the shortlist comprises lookup table indices corresponding to the two or more modes.

21. The system of claim 15, wherein the second transmit mode is selected based on having a highest data rate within the shortlist.