182results about How to "Improve interference effect" patented technology

A transmitter is provided having transmission methods that minimize the power needed to ensure reliable reception in a coverage area. In one aspect, data that requires re-transmission as acknowledged mode data is re-transmitted when the power level of the transmission link is higher than a pre-determined level set for reliable reception. The data rate of the re-transmitted data is set according to the difference in the actual power and the pre-determined level. In a second aspect, two transmitting antennae are used to transmit the same signals with a frequency off-set. The frequency off-set can be used to determine the phase of the signals being received at the receiver, so that a phase off-set can be introduced to optimise the effect of interference at the receiver.

The invention relates to power-line communication interference devices and particularly relates to a plurality of devices which perform communication interference on facilities which use power lines for communication and belongs to the technical field of power-line communication, communication interference and interference resistance and information security. A device specifically includes a power-line interface, a DC power supply, a power-line coupling filter, a power amplifier and an interference signal generator. The invention also provides a power-line communication interference device with a power-line communication signal detection and analysis function, a processing and forwarding power-line communication interference device and a power-line communication signal short circuit / bypassing power-line communication interference device. The power-line communication interference devices are connected with power lines conveniently through forms of power-line insert ports, insert grooves and sockets and the like so that interference signals which interfere power-line communication are generated; an excellent interference effect is achieved through an extra-low interference power and electricity consumption quantity is low so that the power-line communication interference devices are especially suitable for being used in low-power-consumption inference application; and the interference mechanisms are simple in structure, low in realization cost and high in self-adaptive capability.

The invention provides an electric potential type biosensor and method for detecting the concentration of urea in a sample. The electric potential type biosensor comprises an indication electrode anda reference electrode, a second reaction reagent in the indication electrode includes urease but not an electron transfer body, and a first reaction reagent in the reference electrode includes the electron transfer body but not the urease. Under the condition that an external voltage is not applied, urea in the urease catalysis sample makes reaction after that blood and the like are added, an electric potential difference is thus generated between the indication electrode and the reference electrode, and is in linear relation with the concentration of urea in the sample, and the concentrationof urea in the sample can be calculated according to the linear relation.