Adaptive coded modulation in low earth orbit satellite communication system
AssigneeNorthrop Grumman Systems Corporation
InventorsDaniel N. Liu, Michael P. Fitz, Xiaofen Chen
Life of this patent
Estimating the term…
Abstract
A method and system for providing adaptive coded modulation in LEO satellite communication system is provided. The received power signal at the receiver is predicted by the LEO satellite transmitter without using channel feedback from the receiver. The receiver rapidly detects changes in transmission rate and changes its demodulation rate in tandem with the LEO satellite. Certain conditions that vary slowly, such as local weather and ground moisture level, are provided to the transmitter from the receiver at a much slower rate than that used in normal data communications.
Claims20
A method for transmitting data to a receiver by a LEO satellite comprising the steps executed by the LEO satellite of:
- predicting a received signal-to-noise-ratio (SNR) experienced by the receiver based on a range between the LEO satellite and the receiver;
- adapting the coding rate and modulation format of a transmitter in the LEO satellite to the predicted SNR without real-time feedback about the received SNR from the receiver.
A LEO satellite for transmitting data to a receiver comprising:
- one or more processors for predicting a received signal-to-noise-ratio (SNR) experienced by the receiver based on a range between the LEO satellite and the receiver;
- a transmitter adapting the coding rate and modulation format of the transmitter to the predicted SNR without real-time feedback about the received SNR from the receiver.
A LEO satellite communication system for providing adaptive coded modulation (ACM) during LEO satellite communications comprising:
- a ground-based receiver for rapidly detecting changes in transmission rate and changing its demodulation rate in tandem with changes in the transmission rate;
- and
- a transmitter in the LEO satellite for performing ACM in conjunction with predicted received SNR based on a range between the LEO satellite and the ground-based receiver without real-time feedback.
Dependencies are inferred from the claim text.