Method and System for Cooperative Communications with Minimal Coordination
First Claim
1. A cooperative communication system for communicating information in a multiple-node environment comprising:
- At least one source transmitter sending information data;
a plurality of transceivers working in cooperation, with each transceiver receiving the information data, modulating the information data, dithering the modulated information data with a dithering mechanism, and relaying the modulated and dithered information data; and
at least one sink receiver receiving a composite signal comprising a plurality of modulated and dithered information data relayed from the plurality of transceivers.
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Accused Products
Abstract
A method and system are provided in a wireless communications system comprising a plurality of nodes (users) working cooperatively. The system provides cooperative diversity by allowing nodes to actively share their antennas and other resources to obtain spatial diversity. The nodes receive the same message (information data) from a common source. Each node enhances the reliability of the message with a modern forward error correction (FEC) code, converts the FEC encoded message into an ensemble of symbols, divides the ensemble of symbols into packets, modulates, dithers and transmits the packets to a receiving node. The dithering process is performed by varying the signal amplitude, phase, frequency and/or symbol timing of the modulated packets. A unique dither pattern is assigned to each node. The receiving node captures a composite signal comprising the transmitted packets of all or most of the transmitting nodes in the cooperative communications system. Because the transmitted packets are dithered independently in phase and/or amplitude, spatial diversity is transformed into temporal diversity.
70 Citations
35 Claims
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1. A cooperative communication system for communicating information in a multiple-node environment comprising:
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At least one source transmitter sending information data; a plurality of transceivers working in cooperation, with each transceiver receiving the information data, modulating the information data, dithering the modulated information data with a dithering mechanism, and relaying the modulated and dithered information data; and at least one sink receiver receiving a composite signal comprising a plurality of modulated and dithered information data relayed from the plurality of transceivers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of relaying information in a cooperative network having a plurality of nodes, the network including at least one source node transmitting information data, a plurality of hop-nodes working in cooperation, and at least one destination node, the method comprising:
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at each one of the plurality of hop-nodes, receiving the transmitted information data, modulating and dithering the information data; at each one of the plurality of hop-nodes, transmitting the modulated and dithered information data; and at the at least one destination node, receiving a composite signal comprising a plurality of the modulated and dithered information data from the plurality of hop-nodes. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification