Abstract: A system and method for self-harvesting energy from a wireless device and supplementing the battery power of the wireless device using the self-harvested energy includes the steps of collecting at least a portion of radio frequency signals transmitted by the wireless device; converting the collected radio frequency signals from radio frequency signals to direct current energy; further converting the direct current energy to energy compatible with charging requirements for a battery electrically connected to the wireless device; and transferring the compatible energy to the battery of the wireless device through a wireless device interface in order to add the compatible energy to the battery.

Abstract: A system and method for self-harvesting energy from a wireless device and supplementing the battery power of the wireless device using the self-harvested energy includes the steps of collecting at least a portion of radio frequency signals transmitted by the wireless device; converting the collected radio frequency signals from radio frequency signals to direct current energy; further converting the direct current energy to energy compatible with charging requirements for a battery electrically connected to the wireless device; and transferring the compatible energy to the battery of the wireless device through a wireless device interface in order to add the compatible energy to the battery.

Abstract: A system and method for self-harvesting energy from a wireless device and supplementing the battery power of the wireless device using the self-harvested energy includes the steps of collecting at least a portion of radio frequency signals transmitted by the wireless device; converting the collected radio frequency signals from radio frequency signals to direct current energy; further converting the direct current energy to energy compatible with charging requirements for a battery electrically connected to the wireless device; and transferring the compatible energy to the battery of the wireless device through a wireless device interface in order to add the compatible energy to the battery.

Abstract: A protocol for optimizing the energy for code upload to sensors in a wireless sensor network and speeding up the dissemination if multiple sources of code are available. Energy optimization is achieved by equipping each node with limited non-local topology information, which it uses to determine the time when it can sleep since code is not being distributed in its vicinity. Another aspect of the invention is a protocol that facilitates secure upload of code in the wireless sensor network. The secure communication protocol divides the sensor field into control groups each with a control node, and manages data exchange between nodes within a control group through the mediation of a control head which provides the common key. The keys are refreshed periodically and the control nodes are changed periodically to enhance security. The protocol facilitates secure communication between sensor nodes despite the compromise of other nodes in the network.

Abstract: A protocol for optimizing the energy for code upload to sensors in a wireless sensor network and speeding up the dissemination if multiple sources of code are available. Energy optimization is achieved by equipping each node with limited non-local topology information, which it uses to determine the time when it can go to sleep since code is not being distributed in its vicinity. Another aspect of the invention is a protocol that facilitates secure upload of code in the wireless sensor network. The secure communication protocol divides the sensor field into control groups each with a control node, and manages data exchange between nodes within a control group through the mediation of a control head which provides the common key. The keys are refreshed periodically and the control nodes are changed periodically to enhance security. The protocol facilitates secure communication between sensor nodes despite the compromise of any number of other nodes in the network.

Abstract: A technique to encode a group of vectors by quantizing the group with each of a number of different codes (44) and selecting the quantization results which are most favorable. This technique may include providing several vectors to an encoder (40) of a communication system (20) and quantizing each of the vectors with a number of different codebooks (44) to generate a corresponding number of codeword sets with the encoder (40). The codeword sets are each representative of the vectors. Each of the codeword sets is evaluated by determining a corresponding distortion value. The codeword set with the lowest distortion is selected to encode the vectors based on this evaluation. The codebook (44) or sequence of codebooks (44) used to generate the selected codeword set may differ from one vector sample to the next to provide a sample adaptive coding scheme. Transmission of the encoded data to a decoder (50) of communication system (20) may also be performed where the original vectors are reconstructed.