DOWNSTREAM ADAPTIVE MODULATION IN BROADBAND COMMUNICATIONS SYSTEMS
First Claim
1. An adaptive modulation receiver, comprising:
- a splitter configured to split a data stream signal into a plurality of data streams;
a plurality of demodulators, each demodulator from among the plurality of demodulators being configured to demodulate data from a respective data stream from among the plurality of data streams in accordance with a respective demodulation scheme from among a plurality of demodulation schemes; and
a plurality of queues, each queue from among the plurality of queues being associated with a respective demodulator from among the plurality of demodulators.
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Accused Products
Abstract
A downstream adaptive modulation system and method. The downstream adaptive modulation system comprises a wireless access termination system and one or more wireless modems. The wireless access termination system includes a plurality of queues and a parser. The parser parses data traffic onto the plurality of queues. Each queue is associated with a different coding and modulation scheme. Each of the one or more wireless modems receives data traffic from the plurality of queues based on the wireless modem'"'"'s ability to demodulate and decode the signal from each of the plurality of queues. When a wireless modem experiences a change in signal strength, the present invention enables the wireless modem to adapt to data from other queues to compensate for the change in signal strength. Thus, if the signal strength improves over a period of time, the wireless modem may receive data at a higher order modulation and FEC code rate. If the signal strength weakens over a period of time, the wireless modem may receive data at a lower order modulation and FEC code rate.
17 Citations
20 Claims
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1. An adaptive modulation receiver, comprising:
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a splitter configured to split a data stream signal into a plurality of data streams; a plurality of demodulators, each demodulator from among the plurality of demodulators being configured to demodulate data from a respective data stream from among the plurality of data streams in accordance with a respective demodulation scheme from among a plurality of demodulation schemes; and a plurality of queues, each queue from among the plurality of queues being associated with a respective demodulator from among the plurality of demodulators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An adaptive modulation receiver, comprising:
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a plurality of demodulators, each demodulator from among the plurality of demodulators being configured to demodulate a respective signal from among a plurality of signals in accordance with a demodulation scheme that is associated with its respective signal; a plurality of queues, each queue from among the plurality of queues being configured to store demodulated data associated with its respective demodulator from among the plurality of demodulators; and a multiplexer configured to combine demodulated data from each queue from among the plurality of queues into a data stream. - View Dependent Claims (10, 11, 12, 13, 14)
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15. In an adaptive modulation receiver, a method comprising:
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splitting a composite signal received over a communications channel into a plurality of signals; demodulating the plurality of signals according to a demodulation scheme associated with a respective signal from among the plurality of signals to provide demodulated data corresponding to each of the plurality of signals; separately queuing the demodulated data corresponding to each of the plurality of signals to provide a plurality of data queues; combining the plurality of data queues to provide a data stream; and sending the data stream to a user device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification