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AssigneeElectronics and Telecommunications Research Institute
InventorsSoo Young Kim, Kwang Jae Lim, Tae Gon Kwon, Hyoung Soo Lim
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A rain attenuation compensation method using adaptive transmission technique and system using the same compensate a signal attenuation caused by rain in a satellite communication system through an adaptive transmission technique. As an adaptive transmission technique, the method and apparatus employ an adaptive coding using a block turbo code and an adaptive modulation using M-ary PSK modulation. The inventive method estimates a signal-to-noise (S/N) ratio at a receiving end, predicts a signal-to-noise (S/N) ratio at the next time point, allocates the most appropriate transmission method to the predicted signal-to-noise (S/N) ratio, thereby adaptively compensating a rain attenuation. The rain attenuation compensation method includes: the steps of estimating a signal-to-noise (S/N) ratio from PSK-modulated receiving signal at a receiving end; predicting a signal-to-noise (S/N) ratio of the next time point on the basis of the signal-to-noise (S/N) ratio values of the past and present time points; determining which of transmission methods is adequate to the predicted signal-to-noise (S/N) ratio of the next time point. If the switching of the transmission method is determined, a control signal for inquiring the change of the transmission method is transmitted to a transmitting and a receiving end. Then, data is transmitted by the switched transmission method.
A rain attenuation compensation method using adaptive transmission technique in a satellite communication system including a transmission end using a plurality of transmission methods combining an adaptive coding method and an adaptive modulation method, a receiving end using a plurality of receiving methods combining an adaptive decoding method and an adaptive demodulation method, and a controller for estimating/predicting signal-to-noise (S/N) ratio and controlling both the transmission method and transmission power of the transmission end and the receiving method of the receiving end, characterized in that the controller performs a rain attenuation compensation comprising the steps of:
A recording media readable by a computer containing a program therein, the program makes the computer to perform the steps of:
A satellite communication system comprising:
Dependencies are inferred from the claim text.