User scheduling method in multiple antenna system

• US 20090232235A1
• Filed: 03/12/2009
• Published: 09/17/2009
• Est. Priority Date: 03/13/2008
• Status: Active Grant

• Current Assignee: Industry Foundation Of Chonnam National University (Chonnam National University), LG Electronics, Inc. (LG Corporation)
• Original Assignee: Industry Foundation Of Chonnam National University (Chonnam National University), LG Electronics, Inc. (LG Corporation)
• Inventors: Yoo, Cheolwoo, Hwang, Intae, Ihm, Bin Chul, Lee, Wook Bong
• Granted Patent: US 8,275,062 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0618 Space-time coding

Abstract

A user scheduling method includes: determining a maximum temporary user set of a maximum capacity among temporary user sets obtained from combinations of M number of active users; and transmitting data to users belonging to the maximum temporary user set via multiple antennas by using a preceding matrix and a weight matrix with respect to the maximum temporary user set. Users to actually receive data can be selected from among active users in a multi-antenna system, and a corresponding precoding matrix and a weighting matrix can be obtained.

Claims

1. A user scheduling method comprising:

determining a maximum temporary user set of a maximum capacity among temporary user sets obtained from combinations of M number of active users; and

transmitting data to users belonging to the maximum temporary user set via multiple antennas by using a preceding matrix and a weight matrix with respect to the maximum temporary user set.

2. The method of claim 1, further comprising:

processing the data for the users belonging to the maximum temporary user set according to signal processing order.

3. The method of claim 2, wherein the signal processing order is determined based on a weight value of each user.

4. The method of claim 2, wherein data with respect to the user belonging to the maximum temporary user set is processed by using dirty paper coding (DPC), and the signal processing order is the order of performing DPC.

5. The method of claim 2, wherein the precoding matrix is determined according to the signal processing order.

6. The method of claim 1, wherein the weight matrix is obtained based on a reception signal-to-interference plus noise ratio (SINR) with respect to each user.

7. The method of claim 6, wherein the weight matrix is obtained based on a ratio of the reception SINR with respect to each user.

8. A transmitter comprising:

a plurality of transmit antennas;

a scheduler that determines a maximum temporary user set of a maximum capacity among temporary user sets obtained from combinations of M number of active users, and outputs a plurality of data streams with respect to the maximum temporary user set;

a channel encoder that performs channel encoding on the data streams;

a mapper that maps the channel-coded data to data symbols on a signal constellation;

a signal processor that performs signal processing on the data symbols to generate signal-processed symbols;

a power allocation unit that allocates power to the signal-processed symbols through a weight matrix with respect to the maximum temporary user set; and

a precoder that performs precoding on the power-allocated symbols through a precoding matrix with respect to the maximum temporary user set to generate transmit signals transmitted via the plurality of transmit antennas.

9. The transmitter of claim 8, wherein the signal processing unit performs signal processing by using dirty paper coding (DPC), and the preceding matrix is determined according to the DPC performing order.

10. The transmitter of claim 8, wherein transmission power with respect to each transmit antenna is constantly uniform.