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

• US 10,243,625 B2
• Filed: 03/31/2017
• Issued: 03/26/2019
• 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): Nguyen, Simon
• Application Number:
  US15/475,336
• Publication Number:
  US 20170207832A1
• Time in Patent Office: 725 Days
• Field of Search: 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, in said first station, channel conditions between said first and said second stations;

in response to said channel conditions being determined to be first channel conditions;

sending a request to said second station from said first station, said request requesting said second station to send a stream of payload information, and

receiving, from said second station in a first frame on a same frequency, said stream of payload information with transmission diversity through two or more of said second station antennas and a stream of control information with transmission diversity through said two or more of said second station antennas; and

in response to the channel conditions being determined to be second channel conditions;

sending a request to said second station from said first station, said request requesting said second station to send a plurality of different streams of payload information, and

receiving, from said second station in a second frame on a same frequency, said plurality of different streams of payload information with MIMO through said two or more of said second station antennas simultaneously and a stream of a control information with transmission diversity through said two or more of said second station antennas, said plurality of different streams of payload information being ≤

M.

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

3. The method as recited in claim 1, wherein said request indicates a number of streams of payload information to send through said two or more of said second station antennas.

4. A method executed in a second station having M second station antennas, M >

1, which communicates with a first station having a plurality of first station antennas, the method comprising;

receiving a request from said first station;

in response to said request determined depending on first channel conditions between said first station and said second station and requesting said second station to send a stream of payload information;

sending, to said first station in a first frame on a same frequency, said stream of payload information with transmission diversity through two or more of said second station antennas and a stream of control information with transmit diversity through said two or more of said second station antennas; and

in response to said request determined depending on second channel conditions between said first station and said second station and requesting said second station to send a plurality of different streams of payload information;

sending, to said first station in a second frame on a same frequency, said plurality of different streams of payload information with MIMO through said two or more of said second station antennas simultaneously and a stream of control information with transmission diversity through said two or more of said second station antennas, said plurality of different streams of payload information being ≤

M.

5. The method as recited in claim 4, wherein said first channel conditions correspond to high interference and said second channel conditions correspond to low interference.

6. The method as recited in claim 4, wherein said request indicates a number of streams of payload information to send through said two or more of said second station antennas.

7. A receive device communicating with a transmit device through two or more receive antennas, the transmit device communicating through M transmit antennas, M >

1, the receive device comprising;

circuitry configured to;

determine channel conditions between said transmit device and said receive device;

in response to said channel conditions being determined to be first channel conditions;

send a request to said transmit device, said request requesting said transmit device to send a stream of payload information, and

receive, from said transmit device in a first frame on a same frequency, said stream of payload information with transmission diversity through two or more of said second station antennas and a stream of control information with transmission diversity through said two or more of said transmit antennas; and

in response to said channel conditions being determined to be second channel conditions;

send a request to said transmit device, said request requesting said transmit device to send a plurality of different streams of payload information, and

receive, from said transmit device in a second frame on a same frequency, said plurality of different streams of payload information with MIMO through said two or more of said second station antennas simultaneously and a stream of control information with transmission diversity through said two or more of said transmit antennas, said plurality of different streams of payload information being ≤

M.

8. The receive device as recited in claim 7, wherein said first channel conditions correspond to high interference and said second channel conditions correspond to low interference.

9. The receive device as recited in claim 7, wherein said request indicates a number of streams of payload information to send through said two or more of said transmit antennas.

10. A transmit device communicating with a receive device through M transmit antennas, M >

1, the receive device communicating through two or more receive antennas, the transmit device comprising;

circuitry configured to;

receive a request from said receive device;

in response to said request determined depending on first channel conditions between said transmit device and said receive device and requesting said transmit device to send a stream of payload information;

send, in a first frame on a same frequency, said stream of payload information with transmission diversity through two or more of said second station antennas and a stream of control information with transmission diversity through said two or more of said transmit antennas; and

in response to said request determined depending on second channel conditions between said transmit device and said receive device and requesting said transmit device to send a plurality of different streams of payload information;

send, in a second frame on a same frequency, said plurality of different streams of payload information with MIMO through said two or more of said second station antennas simultaneously and a stream of control information with transmission diversity through said two or more of said transmit antennas, said plurality of different streams of payload information being ≤

M.

11. The transmit device as recited in claim 10, wherein said first channel conditions correspond to high interference and said second channel conditions correspond to low interference.

12. The transmit device as recited in claim 10, wherein said request indicates a number of streams of payload information to send through said two or more of said transmit antennas.