Managing Traffic in a Satellite Transmission System
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Accused Products
Abstract
Methods and apparatus are described for management of traffic comprising a statistical shaper having a plurality of inputs each for receiving a data stream and a plurality of outputs forming a variable rate bit streams; a multiplexer which combines the bit streams to form an output stream; a modulation stage which is operable to use one or more of a plurality of different modulation schemes to modulate the bit streams onto an output bearer; and, a controller which is operable to control the amount of data arriving at the modulation stage. The controller performs rate control of the data arriving at the modulation stage so that the rate of data output in the output stream from the modulator stage is within a predetermined limit for the transmission channel. For example if the modulation rate for any one bitstream changes, this would alter the rate of data transmission after the modulation stage except that excess data is stored in buffers. For example, by controlling the data rate arriving at the modulator stage, the controller regulates the amount of data stored in buffers at the modulation stage.
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Citations
50 Claims
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1-24. -24. (canceled)
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25. A transmission formatting arrangement comprising:
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a plurality of inputs each for receiving a data stream; a coding stage or a shaper having a plurality of inputs each for receiving data from the data streams, and a plurality of outputs that are each forming a variable rate bit stream;
a multiplexer which combines the output variable rate bit streams of the encoding stage and/or the shaper to form an output stream;a modulation stage that is operable to use a plurality of different modulation schemes to modulate the bit streams onto an output bearer; and a controller that is operable to control the amount of data arriving at the modulation stage. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of transmission formatting comprising:
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receiving a plurality of input data streams; shaping the input data streams to generate variable rate bit streams; multiplexing the variable rate bit streams to form an output stream; modulating using one or more of a plurality of different modulation schemes to modulate the bit streams onto an output bearer; monitoring a value relating to the rate of arrival of data of the bit streams; and in response thereto controlling the amount of the data received for the modulating. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A method of generating a signal comprising a plurality of variable bit rate data streams, the method comprising the steps of:
modulating the data streams by one or more modulation schemes in accordance with one or more modulation algorithms, the one or more modulation algorithms for the one or more of the data streams being varied over time while keeping the sum of the plurality of variable rate bit streams to be less than a maximum permitted bit rate.
Specification