Abstract: The present disclosure provides a vector quantization based secret key generation device and method. The vector quantization based secret key generation device includes: a channel estimator for estimating a channel based on received signals to generate an estimated channel vector; a channel decorrelator for decorrelating entries of the estimated channel vector to generate a decorrelated estimated channel vector; a plurality of clustered vector quantizers (CVQs) each for quantizing the decorrelated estimated channel vector into a secret key or a secret key index; and a selector for selecting an optimal quantizer output from the plurality of CVQs and determining whether to discard the decorrelated estimated channel vector to reduce key disagreement probability (KDP). Therefore, the present disclosure provides a secret key generation technique that is capable of increasing key entropy and reducing KDP.

Abstract: Methods and systems for obtaining data from a number of distributed sources.

Abstract: Methods and systems that enable a cooperative form of transmission performed by a set of asynchronous transceivers operating as a distributed joint communication system. In an embodiment of the method of this invention, information is transmitted from one or more predetermined nodes (the source nodes) in the network. The information is received at the other nodes (the receiving nodes) in the network. For every information symbol/codeword each of the receiving nodes receives an accumulation of signals from nodes transmitting an earlier stage. At each of the receiving nodes a predetermined criterion is utilized to decide whether to retransmit the received information. If retransmission is indicated, the signal modulating the information symbol is retransmitted from the receiving nodes and delivered to an increasing number of downstream nodes.

Abstract: Methods and systems for obtaining data from a number of distributed sources.

Abstract: Methods and systems that enable a cooperative form of transmission performed by a set of asynchronous transceivers operating as a distributed joint communication system. In an embodiment of the method of this invention, information is transmitted from one or more predetermined nodes (the source nodes) in the network. The information is received at the other nodes (the receiving nodes) in the network. For every information symbol/codeword each of the receiving nodes receives an accumulation of signals from nodes transmitting an earlier stage. At each of the receiving nodes a predetermined criterion is utilized to decide whether to retransmit the received information. If retransmission is indicated, the signal modulating the information symbol is retransmitted from the receiving nodes and delivered to an increasing number of downstream nodes.