Rate-adaptive multiple input/multiple output (MIMO) systems

• US 9,843,364 B2
• Filed: 06/23/2014
• Issued: 12/12/2017
• Est. Priority Date: 01/31/2003
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Luo, Hui, Sollenberger, Nelson Ray, Winters, Jack Harriman
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US14/312,255
• Publication Number:
  US 20140301497A1
• Time in Patent Office: 1,268 Days
• Field of Search: 455101, 455524, 455525, 455 6713
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0667 of delayed versions of same signal using space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

Claims

1. A method executed in a first station having a plurality of first station antennas that communicates with a second station having M second station antennas, M>

1, the method comprising;

determining channel conditions between said first and said second stations;

when said channel conditions are determined to be first conditions, sending first information to said second station from said first station, said first information indicating said second station send a same stream of payload information through one or more of said second station antennas; and

when the channel conditions are determined to be second conditions different from the first conditions, sending second information to said second station from said first station, said second information indicating said second station send a plurality of different streams of payload information through respective ones of the second station antennas, the plurality of different streams being ≦

M.

2. The method as recited in claim 1, wherein the first conditions correspond to high interference and the second conditions correspond to low interference.

3. The method as recited in claim 1, wherein said first information indicates said second station send the same stream of payload information through two or more of said second station antennas.

4. The method as recited in claim 1, wherein said second information indicates said second station send the same stream of payload information through two or more of said second station antennas.

5. The method as recited in claim 1, wherein said first information includes a number of different streams of payload information to send through the respective ones of the second station antennas.

6. The method as recited in claim 1, wherein said second information includes a number of different streams of payload information to send through the respective ones of the second station antennas.

7. The method as recited in claim 1, wherein said second information indicates said second station send the plurality of different streams of payload information through the respective ones of the second station antennas using a same frequency and a same time slot for each of the M different streams.

8. The method as recited in claim 1, wherein said first information indicates said second station send the plurality of different streams of payload information through the respective ones of the second station antennas using a same frequency and a same time slot for each of the M different streams.