ADAPTIVE CODING AND MODULATION APPARATUS AND METHOD FOR FORWARD LINK IN SATELLITE COMMUNICATION

• US 20140056335A1
• Filed: 08/21/2013
• Published: 02/27/2014
• Est. Priority Date: 08/22/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: RYU, Joon Gyu, OH, Deock Gil, WANG, Do Huy
• Granted Patent: US 9,025,679 B2
• Time in Patent Office: Days
• US Class Current: 375/211
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance
• 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 1/0015 characterised by the adaptation strategy

Abstract

An adaptive coding and modulation (ACM) apparatus and method for a forward link in satellite communication is provided. The ACM apparatus may include a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal, a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value, and a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

Claims

1. An adaptive coding and modulation (ACM) apparatus comprising:

a receiving unit to receive a signal-to-noise ratio (SNR) of a received signal;

a determination unit to determine whether the SNR of the received signal is less than or equal to a threshold value; and

a processing unit to execute a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

2. The apparatus of claim 1, wherein the receiving unit is provided with a low-pass filter to filter the received signal at a low frequency.

3. The apparatus of claim 1, wherein the determination unit sets the threshold value by applying an operating margin to an SNR of a highest modulation scheme among modulation schemes of an ACM system.

4. The apparatus of claim 1, wherein the processing unit executes the channel prediction algorithm to predict the SNR in N seconds.

5. The apparatus of claim 1, wherein the processing unit determines a modulation and coding (MODCOD) by comparing the predicted SNR to the threshold value for each MODCOD.

6. An adaptive coding and modulation (ACM) method comprising:

receiving a signal-to-noise ratio (SNR) of a received signal;

determining whether the SNR of the received signal is less than or equal to a threshold value; and

executing a channel prediction algorithm when the SNR of the received signal is determined to be less than or equal to the threshold value.

7. The method of claim 6, wherein the receiving of the SNR of the received signal comprises filtering the SNR of the received signal at a low frequency.

8. The method of claim 6, wherein the determining of whether the SNR of the received signal is less than or equal to the threshold value comprises setting the threshold value by applying an operating margin to an SNR of a highest modulation scheme among modulation schemes of an ACM system.

9. The method of claim 6, wherein the executing of the channel prediction algorithm comprises:

executing the channel prediction algorithm to predict the SNR in N seconds; and

determining a modulation and coding (MODCOD) by comparing the predicted SNR to the threshold value for each MODCOD.

10. A non-transitory computer-readable recording medium comprising a program for implementing the method of claim 6.