LINK ADAPTATION IN WIRELESS COMMUNICATIONS

• US 20100008440A1
• Filed: 02/05/2009
• Published: 01/14/2010
• Est. Priority Date: 07/08/2008
• Status: Abandoned Application

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Juang, Rong-Terng, Yeh, Chun-Lin, Lin, Hsin-Piao, Ting, Pang-An
• Application Number:
  US12/366,400
• Publication Number:
  US 20100008440A1
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/0003 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 1/06 using space diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0058 Allocation criteria

Abstract

A wireless communication system with link adaptation is provided. The wireless communication system may include a channel k-factor estimator estimating a Rician k-factor of a channel based on a signal received from a transmitter, a frequency band grouping unit determining a size of frequency band grouping based on the Rician k-factor, a transmission mode selector determining a transmission mode for each frequency band group based on the Rician k-factor, and a modulation and coding scheme selector determining a modulation and coding scheme for the each frequency band group.

Claims

1. A wireless communication system with link adaptation, comprising:

a channel k-factor estimator estimating a Rician k-factor of a channel based on a signal received from a transmitter;

a frequency band grouping unit determining a size of frequency band grouping based on the Rician k-factor;

a transmission mode selector determining a transmission mode for each frequency band group based on the Rician k-factor; and

a modulation and coding scheme selector determining a modulation and coding scheme for the each frequency band group.

2. The system of claim 1, wherein the Rician k-factor indicates status of the channel.

3. The system of claim 1, wherein a data transmission mode of the system comprises at least one of a single-input single-output (SISO) mode, a transmit diversity mode, and a multiple-input multiple-output (MIMO) mode.

4. The system of claim 1, wherein the frequency band grouping unit determines size of frequency band that uses the same transmission mode and modulating and coding scheme.

5. A wireless communication receiver with link adaptation, comprising:

a channel estimator determining channel information of a channel between the receiver and a transmitter to feedback to the transmitter;

a processing device configured to generate feedback information based on the channel information identifying channel condition; and

an output device for providing the feedback information to the transmitter feedback information comprising a Rician k-factor.

6. The receiver of claim 5, wherein the feedback information includes at least one of the Rician k-factor channel information, a signal-to-noise-ratio, and a signal-to-interference-plus-noise-ratio.

7. A wireless communication transmitter with link adaptation, comprising:

an input interface for receiving feedback information on a channel between the transmitter and a receiver from the receiver;

a processing device configured to select at least one of a frequency band group and a transmission mode; and

a transmitting device configured to transmit data according to at least one of the frequency band group and the transmission mode.

8. The transmitter of claim 7, wherein the feedback information includes at least one of a Rician k-factor channel information, a signal-to-noise-ratio, and a signal-to-interference-plus-noise-ratio.

9. The transmitter of claim 7, wherein the processing device selects a larger coherent bandwidth for a channel with a greater Rician k-factor.

10. The transmitter of claim 7, wherein the transmission mode comprises at least one of a single input single output (SISO) mode, a transmit diversity technique, and a spatial multiplexing technique.

11. The transmitter of claim 7, further comprising a transmission scheduler for scheduling the data for transmission.

12. The transmitter of claim 7, wherein the processing device further selects a modulation and coding scheme for each frequency band group.

13. A link adaptation method based on a Rician k-factor of a channel between a transmitter and a receiver for data transmission in a wireless communication system, comprising:

estimating by the receiver the Rician k-factor of the channel;

determining a size of frequency band grouping based on the Rician k-factor;

selecting by the receiver a transmission mode for each of the frequency band group based on the Rician k-factor;

selecting by the receiver a modulation and coding scheme for the each frequency band group; and

transmitting by the receiver feedback information including the Rician k-factor back to the transmitter

14. The method of claim 13, wherein the transmission mode includes at least one of a single-input single-output (SISO) transmission mode, a transmit diversity technique, and a spatial multiplexing technique.