Downstream adaptive modulation in broadband communications system
First Claim
1. An adaptive modulation transmitter, comprising:
- a plurality of queues, each queue from among the plurality of queues being associated with a modulation scheme from among a plurality of modulation schemes;
a plurality of modulators, each modulator from among the plurality of modulators being configured to modulate data from its respective queue in accordance with the modulation scheme that is associated with its respective queue; and
a summer configured to combine outputs from the plurality of modulators for transmission over a communication channel.
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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.
28 Citations
20 Claims
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1. An adaptive modulation transmitter, comprising:
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a plurality of queues, each queue from among the plurality of queues being associated with a modulation scheme from among a plurality of modulation schemes; a plurality of modulators, each modulator from among the plurality of modulators being configured to modulate data from its respective queue in accordance with the modulation scheme that is associated with its respective queue; and a summer configured to combine outputs from the plurality of modulators for transmission over a communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In an adaptive modulation transmitter, a method comprising:
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queuing data into a queue from among a plurality of queues based on a modulation scheme that is to be used to modulate data within each queue from among the plurality of queues; modulating data from the plurality of queues in accordance with the modulation scheme associated with each queue from among the plurality of queues to provide a plurality of outputs; combining the plurality of outputs into a communications channel; and transmitting the plurality of outputs within the communications channel. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification