TRANSMIT POWER ALLOCATION FOR ADAPTIVE MULTI-CARRIER MULTIPLEXING MIMO SYSTEMS

• US 20120320868A1
• Filed: 08/31/2012
• Published: 12/20/2012
• Est. Priority Date: 12/20/2007
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: STADELMEIER, Lothar, SCHNEIDER, Daniel
• Granted Patent: US 9,276,649 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0426 Power distribution
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 76/00 Connection management
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

The present invention relates to transmit power allocation in multi-carrier, multiplexing MIMO communication systems. The present invention especially relates to a MIMO communication device, a method of assigning transmit power to two or more communication channels and a software program product. A multiple-input-multiple-output, MIMO, communication device according to the present invention comprises a link controller adapted to assign transmit power to two or more transmission channels, each of said transmission channels having preassigned a portion of transmit power for each of a group of subcarriers, said link controller being further adapted to assign, for each subcarrier of said group of subcarriers, at least part of the preassigned transmit power portion of a transmission channel that is not used for transmitting information at the subcarrier, to one or more transmission channels that are used for transmitting information at the subcarrier.

Claims

1. A multiple-input-multiple-output, MIMO, communication device comprising a power allocator receiving two or more transmission channels, each of said transmission channels having preassigned a portion of transmit power for each of a group of subcarriers,

said power allocator further adapted to assign, for each subcarrier of said group of subcarriers, at least part of the preassigned transmit power portion of a transmission channel that is, according to tonemap information for the transmission channel, not used for transmitting information at the subcarrier, to the other one or more transmission channels that are used for transmitting information at the subcarrier, and a MIMO precoder arranged after the power allocator, the MIMO precoder adapted to precode the transmission'"'"' channels.

2. The MIMO communication device according to claim 1, comprising a receiving unit adapted to receive tonemap information for the two or more transmission channels via a communication channel.

3. The MIMO communication device according to claim 2, wherein notching information indicating which transmission channels are not used for transmitting information at which subcarriers is received as part of the tonemap information for the transmission channels.

4. The MIMO communication device according to claim 1, wherein at least some of said transmission channels have preassigned the same transmit power portions for a given subcarrier of said group of subcarriers.

5. The MIMO communication device according to claim 1, wherein at least some subcarriers of said group of subcarriers have preassigned the same transmit power portions for a given transmission channel.

6. The MIMO communication device according to claim 1, wherein the MIMO communication device is a PLC MIMO communication device.

7. A method of performing multiple-input multiple-output, MIMO, communication, comprising:

receiving two or more transmission channels, each of said transmission channels having preassigned a portion of transmit power for each of a group of subcarriers;

assigning, for each subcarrier of said group of subcarriers, at least part of the preassigned transmit power portion of a transmission channel that is, according to tonemap information for the transmission channel, not used for transmitting information at the subcarrier, to one or more transmission channels that are used for transmitting information at the subcarrier; and

then precoding the transmission channels.

8. The method according to claim 7, further comprising:

receiving tonemap information for the two or more transmission channels via a communication channel.

9. The method according to claim 7, wherein at least some of said transmission channels have preassigned the same transmit power portions for a given subcarrier of said group of subcarriers.

10. The method according to claim 7, wherein at least some subcarriers of said group of subcarriers have preassigned the same transmit power portions for a given transmission channel.

11. The method according to claim 7, wherein the subcarrier s are subcarriers of a PLC system.

12. A software program product which, when executed by one or more processing device, is adapted to carry out the method according to claim 7.