AUTOMATIC GAIN CONTROL APPARATUS AND METHOD FOR COMPRESSED MODE IN MIMO SYSTEM

• US 20100104052A1
• Filed: 10/28/2009
• Published: 04/29/2010
• Est. Priority Date: 10/28/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KANG, Shin-Woo, KIM, Joo-Kwang, YEO, Soo-Bok, HAN, Sung-Chul, JEON, Ki-Hwan, PARK, Hung-Su
• Granted Patent: US 8,724,726 B2
• Time in Patent Office: Days
• US Class Current: 375/345
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 52/52 using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

An automatic gain control apparatus and method for a compressed mode in a MIMO system are provided. The method includes determining power at a first frequency band using a first receiver, simultaneously determining power at a second frequency band using a second receiver in a compressed mode, if the second receiver changes a power determination frequency band into the first frequency band, correcting the power determination value of the first receiver, and applying the corrected power determination value of the first receiver to the second receiver.

Claims

1. A method for Automatic Gain Control (AGC) during a compressed mode search in a Multiple Input Multiple Output (MIMO) system, the method comprising:

determining power at a first frequency band using a first receiver;

in a compressed mode, simultaneously determining power at a second frequency band using a second receiver;

if the second receiver changes a power determination frequency band into the first frequency band, correcting the power determination value of the first receiver; and

applying the corrected power determination value of the first receiver to the second receiver.

2. The method of claim 1, wherein the correcting of the power determination value of the first receiver comprises:

determining an average value of the power determination value of the first receiver of a predefined number of times and the power determination value of the second receiver of a predefined number of times;

comparing the average value with at least one predefined threshold value; and

based on the comparison result, correcting the power determination value of the first receiver.

3. The method of claim 2, wherein the correcting of the power determination value of the first receiver, based on the comparison result, comprises:

determining if the average value is positioned within a range of the at least one predefined threshold value;

based on the position of the average value, determining a similarity between the at least one predefined threshold value and the average value; and

correcting the power determination value of the first receiver using a correction value based on the similarity.

4. The method of claim 3, wherein the similarity comprises at least one of a non-similarity, a low similarity, a high similarity and a very high similarity.

5. The method of claim 4, wherein the applying of the corrected power determination value of the first receiver to the second receiver comprises:

inputting the corrected power determination value of the first receiver to the second receiver; and

based on the similarity, operating the AGC with at least one of a large BandWidth (BW) and a small BW.

6. The method of claim 5, wherein the AGC operates with a large BW for a constant time when the similarity is the non-similarity.

7. The method of claim 5, wherein the AGC operates with a large BW for a constant time when the similarity is the low similarity.

8. The method of claim 5, wherein the AGC operates with a small BW for a constant time when the similarity is the high similarity.

9. The method of claim 5, wherein the AGC operates with a small BW for a constant time when the similarity is the very high similarity.

10. An apparatus for Automatic Gain Control (AGC) during a compressed mode search in a Multiple Input Multiple Output (MIMO) system, the apparatus comprising:

a first receiver for determining power at a first frequency band;

a second receiver for, in a compressed mode, simultaneously determining power at a second frequency band; and

a channel comparator for correcting the power determination value of the first receiver, if the second receiver changes a power determination frequency band into the first frequency band, and applying the corrected power determination value of the first receiver to the second receiver.

11. The apparatus of claim 10, wherein the channel comparator

determines an average value of the power determination value of the first receiver of a predefined number of times and the power determination value of the second receiver of a predefined number of times,

compares the average value with at least one predefined threshold value, and

corrects the power determination value of the first receiver based on the comparison result.

12. The apparatus of claim 11, wherein the channel comparator

determines if the average value is positioned within a range of the at least one predefined threshold value,

based on the position of the average value, determines a similarity between the at least one predefined threshold value and the average value, and

corrects the power determination value of the first receiver using a correction value based on the similarity.

13. The apparatus of claim 12, wherein the similarity comprises at least one of a non-similarity, a low similarity, a high similarity and a very high similarity.

14. The apparatus of claim 13, wherein the channel comparator

inputs the corrected power determination value of the first receiver to the second receiver, and

operates the AGC with at least one of a large BW and a small BW based on the similarity.

15. The apparatus of claim 14, wherein the AGC operates with a large BW for a constant time when the similarity is the non-similarity.

16. The apparatus of claim 14, wherein the AGC operates with a large BW for a constant time when the similarity is the low similarity.

17. The apparatus of claim 14, wherein the AGC operates with a small BW for a constant time when the similarity is the high similarity.

18. The apparatus of claim 14, wherein the AGC operates with a small BW for a constant time when the similarity is the very high similarity.