Adaptive mode-switching spatial modulation for MIMO wireless communication system

Patent metadata

Field	Value
Publication number	US-9484994-B2
Application number	US-201214408563-A
Country	US
Kind code	B2
Filing date	Jun 18, 2012
Priority date	Jun 18, 2012
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

Techniques are generally described related to tag refinement strategy. One example method for communicating between a first wireless system having a plurality of first antennas and a second wireless system having a plurality of second antennas may be presented. The method may include receiving configuration information associated with the plurality of first antennas and a plurality of modulation schemes which the first wireless system is configured to support; determining a plurality of configurations based on the configuration information, wherein each of the plurality of configurations defines a corresponding subset of first antennas selected from the plurality of first antennas and a corresponding modulation scheme selected from the plurality of modulation schemes; and selecting a first configuration from the plurality of configurations, wherein when operating under the first configuration, the first wireless system is configured to achieve one or more performance criteria.

First claim

We claim:

1. A method to communicate between a mobile device having a plurality of transmit antennas and a base station having a plurality of receive antennas, comprising:
receiving, by the base station from the mobile device, a message comprising configuration information associated with the plurality of transmit antennas and a plurality of modulation schemes which the mobile device is configured to support, wherein the message is received through a first channel between the base station and the mobile device;
determining, by the base station, a condition of the first channel;
retrieving, by the base station, a plurality of configurations based on the determined condition of the first channel and the configuration information, wherein each of the plurality of configurations defines a corresponding subset of transmit antennas selected from the plurality of transmit antennas and a corresponding modulation scheme selected from the plurality of modulation schemes;
determining, by the base station, a channel matrix which contains channel state information for a plurality of links, each of which connects one of the plurality of transmit antennas with one of the plurality of receive antennas;
calculating, by the base station, a corresponding set of Euclidean distance values for each of the plurality of configurations based on the channel matrix;
determining, by the base station, a corresponding Minimum Euclidean Distance (MED) value for each of the plurality of configurations based on the corresponding set of Euclidean distance values;
selecting, by the base station, a first configuration from the plurality of configurations for corresponding to a largest MED value among the determined MED values, wherein when operating under the first configuration, the mobile device is configured to achieve one or more performance criteria; and
transmitting, by the base station, the first configuration to the mobile device.

2. The method as recited in claim 1 , further comprising:
receiving, by the base station, wireless signals through the first channel from the mobile device which is operating in a first modulation scheme and utilizing a first subset of transmit antennas, wherein the first configuration defines the first subset of transmit antennas and the first modulation scheme.

3. The method as recited in claim 2 , wherein the receiving the wireless signals from the mobile device comprises:
utilizing spatial modulation (SM) to transmit/receive the wireless signals among the first subset of transmit antennas and the plurality of receive antennas.

4. The method as recited in claim 2 , further comprising:
transmitting, by the base station, a mode switching message to the mobile device for instructing the mobile device to utilize the first subset of transmit antennas and operate in the first modulation scheme.

5. The method as recited in claim 1 , wherein the plurality of modulation schemes include Phase Shift Keying (PSK) modulation and Quadrature Amplitude Modulation (QAM).

6. The method as recited in claim 1 , wherein the one or more performance criteria include a bit error rate (BER).

7. The method as recited in claim 1 , wherein when operating under any of the plurality of configurations, the mobile device is configured to transmit signals at a predetermined spectral efficiency rate.

8. The method as recited in claim 1 , wherein the corresponding Euclidean distance values are for constellation points having antenna dimensions associated with the corresponding subset of transmit antennas and constellation dimensions associated with the corresponding modulation scheme.

9. A method to communicate between a mobile device having a plurality of transmit antennas and a base station having a plurality of receive antennas, comprising:
transmitting, by the mobile device, a message comprising configuration information associated with the plurality of transmit antennas and a plurality of modulation schemes which the mobile device is configured to support, wherein the message is transmitted through a first channel between the base station and the mobile device;
receiving, by the mobile device, a first configuration selected by the base station and defining a first subset of transmit antennas and a first modulation scheme, wherein the first configuration is selected from a plurality of configurations based on the configuration information and a largest Minimum Euclidean Distance (MED) value among MED values corresponding to the plurality of configurations, and each of the plurality of configurations defines a corresponding subset of transmit antennas selected from the plurality of transmit antennas and a corresponding modulation scheme selected from the plurality of modulation schemes; and
transmitting, by the mobile device utilizing the first subset of transmit antennas and operating in the first modulation scheme, wireless signals to the base station utilizing the plurality of receiver antennas through the first channel.

10. The method as recited in claim 9 , wherein the first configuration is selected from the plurality of configurations based on a first condition of the first channel, and the mobile device is configured to achieve one or more performance criteria when operating under the first configuration.

11. The method as recited in claim 10 , further comprises:
receiving, by the mobile device, a second configuration defining a second subset of transmit antennas selected from the plurality of transmit antennas and a second modulation scheme selected from the plurality of modulation schemes; and
switching, by the mobile device, the utilizing the first subset of transmit antennas to utilizing the second subset of transmit antennas, and the operating in the first modulation scheme to operating in the second modulation scheme.

12. The method as recited in claim 11 , wherein the second configuration is selected from the plurality of configurations based on a second condition of the first channel, and the mobile device is configured to achieve the one or more performance criteria when operating under the second configuration.

13. The method as recited in claim 11 , wherein the transmitting the wireless signals to the base station comprises:
utilizing spatial modulation (SM) to transmit/receive the wireless signals among the first subset of transmit antennas and the plurality of receive antennas.

14. The method as recited in claim 9 , wherein when operating under any of the plurality of configurations, the mobile device is configured to transmit signals at a predetermined spectral efficiency rate.

15. A base station to communicate with a mobile device having a plurality of transmit antennas, comprising:
a plurality of receive antennas; and
a mode-selection unit coupled with the plurality of receive antennas, wherein the mode-selection unit is configured to
receive, from the mobile device, a message comprising configuration information associated with the plurality of transmit antennas and a plurality of modulation schemes which the mobile device is configured to support, wherein the message is received through a first channel between the base station and the mobile device;
determine a condition of the first channel;
retrieve a plurality of configurations based on the determined condition of the first channel and the configuration information, wherein each of the plurality of configurations defines a corresponding subset of transmit antennas selected from the plurality of transmit antennas and a corresponding modulation scheme selected from the plurality of modulation schemes;
determine a channel matrix which contains channel

Assignees

• Xiao Yue
• Fang Jun
• Yang Ping
• Empire Technology Dev Llc

Inventors

• Xiao Yue
• Fang Jun
• Yang Ping

Classifications

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04B7/0691

  using subgroups of transmit antennas · CPC title

• H04B7/063 Primary

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04L27/0008

  arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453) · CPC title