Adaptive coding and modulation for spot beam satellite broadcast
First Claim
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1. A method of adaptively controlling a transmission signal for transmission to a receiver in a terrestrial region, comprising the steps of:
- receiving information describing a time-varying propagation characteristic of the transmission signal in the terrestrial region;
selecting a transmission signal mode from a plurality of transmission signal modes according to the received information, the transmission signal modes defined by transmission signal characteristics including modulation scheme and code rate;
changing the transmission signal according to the selected transmission signal mode; and
wherein the transmission signal comprises a media program having a transition and the timing of the change in the transmission signal according to the selected transmission signal mode is controlled to be made during the transition.
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Abstract
A method and apparatus for adaptively controlling a transmission signal for transmission to at least one receiver in a terrestrial region is disclosed. The method selects a transmission signal mode having a modulation scheme, code scheme, and code rate from a plurality of transmission signal modes according to received information, generates a transmission signal according to the selected mode, and transmits the generated transmission signal to the receiver.
124 Citations
36 Claims
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1. A method of adaptively controlling a transmission signal for transmission to a receiver in a terrestrial region, comprising the steps of:
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receiving information describing a time-varying propagation characteristic of the transmission signal in the terrestrial region; selecting a transmission signal mode from a plurality of transmission signal modes according to the received information, the transmission signal modes defined by transmission signal characteristics including modulation scheme and code rate; changing the transmission signal according to the selected transmission signal mode; and wherein the transmission signal comprises a media program having a transition and the timing of the change in the transmission signal according to the selected transmission signal mode is controlled to be made during the transition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 34)
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12. An apparatus for transmitting an adaptively controlled signal to a subscriber receiver in a terrestrial region, comprising:
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an information receiver for receiving information describing a time-varying propagation characteristic of the signal in the terrestrial region; a signal generator for generating a transmission signal according to a selected one of a plurality of transmission signal modes, wherein the selected one of the transmission signal modes is selected according to the received information and the transmission signal modes are defined by transmission signal characteristics including modulation scheme, and code rate; and a transmitter for transmitting the generated transmission signal; wherein the transmission signal comprises a media program having a transition and the timing of a change in the selected transmission signal according to the selected one of the transmission signal modes is controlled to be made during the transition. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 35)
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23. An apparatus for adaptively controlling a transmission signal for transmission to at least one receiver in a terrestrial region, comprising:
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means for receiving information describing a time-varying propagation characteristic of the transmission signal in the terrestrial region; means for selecting a transmission signal mode from a plurality of transmission signal modes according to the received information, the transmission signal modes defined by transmission signal characteristics including modulation scheme and code rate; means for changing the transmission signal according to the selected transmission signal mode; and wherein the transmission signal comprises a media program having a transition and the timing of a change in the transmission signal according to the selected transmission signal mode is controlled to be made during the transition. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 36)
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Specification