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| Data recovery device |
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| Transceiver providing selectable frequencies and spreading sequences |
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| Jamming suppression of spread spectrum antenna/receiver systems |
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| Satellite relay system |
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| Topology-based fault analysis in telecommunications networks |
| OF THE INVENTION Telecommunications networks are typically monitored by Remote Monitoring Systems (... |
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| Apparatus and method for identifying records of overflowed ACD calls |
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Multi-carrier transmission system utilizing channels of different bandwidth
| Details |
Inventors: Tzannes, Michael A.; Heller, Peter Niels; Stautner, John P.; Morrell, William R.; Jayasimha, Sriram;
Assignee: Aware, Inc. (Bedford, MA)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Tran; Khai
Attorney, Agent or Firm: Testa, Hurwitz & Thibeault, LLP
A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed on the communication link by the transmitter. The transmitter includes a clock for defining successive frames, each of the frames including M time intervals, where M is an integer greater than 1. A modulator modulates each of M carrier signals with a signal related to the value of one of the symbols thereby generating a modulated carrier signal corresponding to each of the carrier signals. The modulated carriers are combined into a sum signal which is transmitted on the communication link. The carrier signals include first and second carriers, the first carrier having a different bandwidth than the second carrier. In one embodiment, the modulator includes a tree-structured array of filter banks having M leaf nodes, each of the values related to the symbols forming an input to a corresponding one of the leaf nodes. Each of the nodes includes one of the filter banks. Similarly, the receiver can be constructed of a tree-structured array of sub-band filter banks for converting M time-domain samples received on the communication link to M symbol values. |
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DETAILED DESCRIPTION The present invention is a communication system for sending a sequence of symbols on a communication link.
The system includes a transmitter for placing information indicative of the sequence of symbols on the communication link and a receiver for receiving the information placed on the communication link by the transmitter.
The transmitter includes a clock for defining successive frames, each of the frames including M time intervals, where M is an integer greater than 1.
A modulator modulates each of the M carrier signals with a signal related to the value of one of the symbols thereby generating a modulated carrier signal corresponding to each of the carrier signals.
The modulated carriers are combined into a sum signal which is transmitted on the communication link.
The carrier signals include first and second carriers, the first carrier having a different bandwidth than the second carrier.
In one embodiment, the modulator includes a tree-structured array of filter banks having M leaf nodes, each of the values related to the symbols forming an input to a corresponding one of the leaf nodes.
Each of the nodes includes one of the filter banks.
Similarly, the receiver can be constructed of a tree-structured array of sub-band filter banks for converting M time-domain samples received on the communication link to M symbol values.
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Multiplexer-related 
