# US 8,787,263 B2 · Apparatus and method for estimating channel based on weather data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,263 B2 - Document ID: US8787263B2 - Status: Granted - Kind: B2 - Application number: 13/611,120 - Filed: 2012-09-12 - Published: 2013-05-09 - Granted: 2014-07-22 - Earliest claimed: 2011-11-08 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Mankyu Park; Deock Gil Oh - Inventors: Mankyu Park; Deock Gil Oh - Web page: https://patentgrep.com/patent/US8787263B2 ## CPC - H04L 25/0202: {Channel estimation} - H04B 7/18513: {Transmission in a satellite or space-based system} - H04B 7/18543: {for adaptation of transmission parameters, e.g. power control (for detecting or preventing errors in the information received H04L1/00)} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/0026: {Transmission of channel quality indication} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## 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 ### Claim 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, 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; 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. ### Claim 2 (depends on 1) The method of claim 1, wherein, in the acquiring of weather data, the central station acquires the weather data from a weather data storage device that measures and manages weather data. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 1) The method of claim 1, wherein the channel measurement information is a signal-to-noise ratio (SNR) value. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 5) The method of claim 5, wherein the weather data is a cumulative average value of weather data that are accumulated during a predetermined period. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) The method of claim 1, wherein the received message is formed in a user diagram protocol (UDP) format. ### Claim 9 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, wherein the calculating of a channel estimating value comprises: providing a weight value to the acquired sample data and applying a different weight value from the weight value to the weather data; and calculating the channel estimating value based on sample data to which the weight value is applied and the weather data to which a different weight value from the weight value is applied; and determining, by the central station, encoding and modulation methods for processing data based on the channel estimating value. ### Claim 10 (depends on 9) The method of claim 9, 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. ### Claim 11 (depends on 9) The method of claim 9, 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. ### Claim 12 (depends on 9) The method of claim 9, wherein the channel measurement information is a signal-to-noise ratio (SNR) value. ### Claim 13 (depends on 9) The method of claim 9, wherein the weather data is a cumulative average value of weather data that are accumulated during a predetermined period. ### Claim 14 (depends on 9) The method of claim 9, wherein, in the acquiring of weather data, the central station acquires the weather data from a weather data storage device that measures and manages weather data; and the central station receives weather data corresponding to a predetermined period from the weather data storage device at a predetermined cycle.