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175results about How to "Reduce transmit power" patented technology

Intra-cell device to device direct communication method based on user device relay

The invention discloses an intra-cell device to device direct communication method based on user device relay. According to the method, when a first device and a second device in the same cell need to be communicated with each other, if a ProSe server finds the distance between the two devices is too far to meet the distance requirement of device to device communication, the ProSe sends a request message for searching for an available relay device to an eNB (evolved node base) ; after receiving the request message, the eNB searches and feeds a result back to the ProSe server; the ProSe server selects a proper relay device by using the feedback result, and sends a beacon resource request to the eNB; the eNB respectively allocates beacon resources for the first device and the relay device as well as the second device and the relay device, and the relay device and the second device notify the eNB of a communication quality detection result; device to device communication scheduling is performed; after finishing service transmission, the communication devices release the device to device resources. According to the method, the communication is performed in a device to device relay mode, sending power is reduced, user device energy is saved, and the system performance is improved.
Owner:XIDIAN UNIV

Aircraft broadband wireless system and methods

A broadband wireless system includes a plurality of spaced-apart ground stations for transmitting and receiving signals to and from a respective plurality of aircraft. Each of the plurality of ground stations may include a ground station transceiver including a ground station antenna carried by a mechanically steered platform, a ground station router in communication with the ground station transceiver, and a ground station beacon transceiver in communication with the ground station router. An aircraft transceiver may be carried by each of the plurality of aircraft to be positioned in communication with one of the plurality of ground stations. The aircraft transceiver may include an aircraft antenna mounted to the aircraft, an aircraft transceiver carried by the aircraft and in communication with the aircraft antenna, and an aircraft radio transceiver carried by the aircraft and in communication with the aircraft beacon transceiver. The broadband wireless system may also include a network operations center in communication with each of the ground stations via a global communications network. A ground station transceiver may transmit signals to and receives signals from not more than one aircraft at a time and ground station antenna may track the aircraft with which it is in communication.
Owner:THE BROWN FAMILY TRUST

Automatic adjustment method of mobile phone and mobile phone radiation

InactiveCN102263861AReduce SAR valueAutomatically reduce transmit powerSubstation equipmentProximity sensorAudio power amplifier
The invention discloses a mobile phone and a method for automatically adjusting the radiation of the mobile phone. The mobile phone includes a radio frequency chip, a baseband chip, a proximity sensor and a power amplifier. The radio frequency chip generates radio frequency signals. The baseband chip is connected with the radio frequency chip and controls the radio frequency chip to generate radio frequency signals. The proximity sensor is connected to the baseband chip and starts when it detects the approach of a human face. The power amplifier is connected with the radio frequency chip and the baseband chip. When the proximity sensor is not activated, the baseband chip controls the power amplifier to adjust the transmission power of the radio frequency signal to the first transmission power according to the first radio frequency parameter. When the proximity sensor is activated, the baseband chip controls the power amplifier according to the second radio frequency parameter. Adjust the transmit power of the radio frequency signal to the second transmit power. The first transmit power is greater than the second transmit power. Through the above method, when the user approaches the mobile phone to talk, the transmission power of the radio frequency signal adjusted by the power amplifier can be automatically reduced, thereby reducing radiation.
Owner:HUIZHOU TCL MOBILE COMM CO LTD

Filter bank multi-carrier visible light communication system and method based on DC (Direct Current) bias

The invention discloses a filter bank multi-carrier visible light communication system and method based on DC (Direct Current) bias. The system comprises a sending end and a receiving end; cores of the sending end and the receiving end respectively are a comprehensive filter bank processing module and an analysis filter bank processing module; by sub-band synthesis filters using actual value coefficients, the requirement that a sent signal is an actual value is met; and by using the DC bias, the requirement that the sent signal is a positive value is further met, so that a filter bank multi-carrier technology is successfully applied to the visible light communication. Compared with an existing OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier based visible light communication system, the system provided by the invention has two obvious advantages that on one hand, a cyclic prefix does not need to be attached to a sending data block, so that sending power is saved and spectrum utilization efficiency is improved; and on the other hand, the provided system can well support an asynchronous transmission mode, so that flexibility of system design is improved, the requirement for synchronization of the sending and receiving ends of the system is reduced and the filter bank multi-carrier visible light communication system is beneficial for reducing system implementation cost.
Owner:SOUTHEAST UNIV

Wirelessly chargeable RFID electronic tag

The invention relates to a wirelessly chargeable RFID electronic tag, comprising a signal receiving antenna, a signal processing module, an energy receiving antenna, a rectifying circuit module and an energy storage capacitor, wherein the rectifying circuit module comprises a low pass filter, a matching circuit, a rectifier diode and a direct-pass filter, wherein one end of the low pass filter is directly connected with the energy receiving antenna and the other end is connected with the matching circuit; the matching circuit is connected with the direct-pass filter via the rectifier diode, the other end of the direct-pass filter is directly connected with the energy storage capacitor, the other end of the energy storage capacitor is directly connected with the signal processing module, and the signal processing module is connected with the signal receiving antenna. The RFID electronic tag capable of being charged in a wireless mode has the following benefits that the advantages of an active RFID such as long recognition distance, large transmission data amount, low emission power and high compatibility and the like are reserved, and the problem that the service life of the existing active RFID electronic tag depends on the service life of cells is eliminated. The wirelessly chargeable RFID electronic tag has wide application prospect.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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