APPARATUS AND METHOD FOR ESTIMATING CHANNEL BASED ON WEATHER DATA

• US 20130114442A1
• Filed: 09/12/2012
• Published: 05/09/2013
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: OH, Deock Gil, PARK, Mankyu
• Granted Patent: US 8,787,263 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• 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 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

In a satellite communication system, a central station receives a message including channel measurement information that is provided from a terminal and calculates a channel estimating value based on the received channel measurement information and weather data of a region corresponding to a location of the terminal. The central station determines encoding and modulation methods of data to transmit based on the calculated channel estimating value.

Claims

1. A method of estimating a channel, the method comprising:

receiving, by a central station, a message comprising channel measurement information from a terminal;

extracting, by the central station, channel measurement information from the received message and acquiring sample data by processing the channel measurement information;

acquiring, by the central station, weather data corresponding to a region at which the terminal is located;

calculating, by the central station, a channel estimating value based on the sample data and the weather data; and

determining, by the central station, encoding and modulation methods for processing data based on the channel estimating value.

2. The method of claim 1, wherein, in the acquiring of weather data,

the central station acquires the weather data from the weather data storage device that measures and manages weather data.

3. The method of claim 2, wherein the central station receives weather data corresponding to a predetermined period from the weather data storage device at a predetermined cycle.

4. The method of claim 1, wherein the acquiring of sample data comprises:

providing a first weight value to previously calculated sample data and applying a different weight value from the first weight value to present channel measurement information that is extracted from the received message; and

calculating sample data of the received message based on the previous sample data to which the first weight value is applied and present channel measurement information to which a different weight value from the first weight value is applied.

5. The method of claim 4, wherein the channel measurement information is a signal-to-noise ratio (SNR) value.

6. The method of claim 1, wherein the calculating of a channel estimating value comprises:

providing a second weight value to the acquired sample data and applying a different weight value from the second weight value to the weather data; and

calculating the channel estimating value based on sample data to which the second weight value is applied and the weather data to which a different weight value from the second weight value is applied.

7. The method of claim 6, wherein the weather data is a cumulative average value of weather data that are accumulated during a predetermined period.

8. The method of claim 1, further comprising:

determining whether a corresponding terminal is a registered terminal based on the received message; and

removing, if a corresponding terminal is not a registered terminal, the received message,

wherein the acquiring of sample data comprises acquiring, if a corresponding terminal is a registered terminal, the sample data based on channel measurement information of the received message.

9. The method of claim 1, wherein the received message is formed in a user diagram protocol (UDP) format.

10. A channel estimation apparatus comprising:

a filtering unit that extracts channel measurement information from a message comprising channel measurement information that is received from a terminal and that acquires sample data by processing the channel measurement information;

a weather data acquisition unit that acquires weather data corresponding to a region at which the terminal is located;

a channel estimation unit that calculates a channel estimating value based on the sample data and the weather data; and

a determining unit that determines encoding and modulation methods for processing data based on the channel estimating value.

11. The channel estimation apparatus of claim 10, wherein the filtering unit provides a first weight value to previously calculated sample data and calculates sample data based on a presently received message by providing a different weight value from the first weight value to channel measurement information that is extracted from the received message.

12. The channel estimation apparatus of claim 11, wherein the channel estimation unit calculates the channel estimating value by providing a second weight value to sample data that is calculated by the filtering unit and providing a different weight value from the second weight value to the weather data.

13. The channel estimation apparatus of claim 10, wherein the channel measurement information is a signal-to-noise ratio (SNR) value, and

the weather data is a cumulative average value of weather data that are accumulated during a predetermined period.

14. The channel estimation apparatus of claim 10, further comprising:

a message authentication unit that determines whether the received message is a message that is received from a registered terminal; and

a data storage unit that stores weather data.

15. The channel estimation apparatus of claim 14, wherein the weather data acquisition unit periodically receives weather data corresponding to a predetermined period from a weather data storage device that measures and manages weather data through a security channel.