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

A method for power control in an ultra wideband impulse radio system includes: (a) transmitting an impulse radio signal from a first transceiver; (b) receiving the impulse radio signal at a second transceiver; (c) determining at least one performance measurement of the received impulse radio signal; and (d) controlling output power of at least one of the first transceiver and the second transceiver in accordance with the at least one performance measurement.

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.

Transmit power (e.g., maximum transmit power) may be defined based on the maximum received signal strength allowed by a receiver and a minimum coupling loss from a transmitting node to a receiver. Transmit power may be defined for an access node (e.g., a femto node) such that a corresponding outage created in a cell (e.g., a macro cell) is limited while still providing an acceptable level of coverage for access terminals associated with the access node. An access node may autonomously adjust its transmit power based on channel measurement and a defined coverage hole to mitigate interference. Transmit power may be defined based on channel quality. Transmit power may be defined based on a signal-to-noise ratio at an access terminal. The transmit power of neighboring access nodes also may be controlled by inter-access node signaling.

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.

In a base station which has a plurality of antennas, each of a plurality of comparison circuits operates to compare correlation levels, which are obtained by despreading received signals for a plurality of channels, with each other with respect to the antennas. Each of a plurality of transmission antenna selecting circuits operates to determine from which antenna a transmission signal is to be transmitted for every channel. Each of a plurality of multiplexing circuits operates to multiplex the transmission signals of the individual channels, which are spread, for every antenna. As a result, on the basis of the result of the comparison of the correlation levels with respect to the antennas, a transmission antenna is selected for every channel, and the signals of the channels that are to be transmitted by a given antenna are multiplexed, whereby the base station achieves transmission diversity.

A pulse radar is provided with a filter for eliminating a transmission waveform interfered with an answering signal from a received waveform, and a harmonic detector or a phase delay detector for detecting arrival and end of the answering signal reflected on a target.

The invention discloses a method, a control device and a wireless terminal for reducing the radiation hazard of the wireless terminal, belonging to the field of wireless radiation protection, wherein the method for reducing the radiation hazard of the wireless terminal comprises the following steps: using the control device to detect whether an antenna of the wireless terminal is approached by an object or not; and using the control device to adjust the output power of a wireless terminal transmitter connected with the antenna to the output protection power and reduce the specific absorption rate value of the antenna to the set value if the antenna is detected to be approached by the object. The embodiment of the invention can reduce the radiation of the wireless terminal to a human body. The technical scheme is applicable to wireless communication terminals.

A method and apparatus is described for modifying a smart antenna processing strategy determined from a set of signals received at an array of antenna elements of a wireless station, such as a set of weights for processing received antenna signals or forming a set of antenna signals for transmission. The method and apparatus uses the signatures of one or more interferers to produce a modified processing strategy that improves the nulling to the one or more interferers in that, when the modified strategy is applied on the downlink, the transmit signal strength in the direction of the one or more interferers is decreased, and, when the modified strategy is applied on the uplink, the sensitivity to signals from the direction of the one or more interferers is decreased.

A process and a device for the radio transmission of signals generated near the body via an array of at least two antennas arranged in different positions near the body. At least one antenna, which will act as the transmitting antenna, is selected before or during the transmission.

Out of band (OOB) communication facilitates femtocell operation. One or more proximity agent provides out of band communication with nodes (e.g., mobile client devices) to provide assistance in or otherwise facilitate femtocell discovery, reselection, and/or interference mitigation. Out of band communication techniques provide for low power discovery, association, and communication as compared to corresponding femtocell or cellular network communication techniques. An OOB proximity agent is provided in association with a femtocell to provide transmit power level control with respect to the femtocell. In operation, if a client device searches for and finds an OOB proximity agent, it will find a femtocell, thereby avoiding a need to aggressively search for femtocells.

A method for controlling transmission power of a wireless device is provided. A WiFi link is established to a communication device. A data rate of data packets transmitted to the communication device is monitored. Information from the communication device is obtained in response to the transmitted data packets. A transmission power of the wireless device is decreased when the data rate of the data packets reaches a highest data rate and the first information satisfies a specific condition.

The invention discloses a method for controlling the high-speed downlink packet access transmission, which comprises the steps that: a base station node (Node B) removes the redundancy transmission control information in a high-speed sharing control channel (HS-SCCH); Node B codes the transmission control information needing to be transmitted in the HS-SCCH and sends the transmission control information after being coded to a user equipment (UE) through the HS-SCCH; UE applies the receiving operation to the transmission of the high-speed downlink packet access (HSDPA) according to the transmission control information in the HS-SCCH. In addition, the invention also discloses a control system and a device for downlink packet access transmission and can eliminate the redundancy on the HS-SCCH.

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.

The present invention relates to a method for transmitting data packets from a mobile terminal to a base station using a hybrid automatic repeat request protocol and soft combining of received data. Further, the present invention provides a base station and a mo-bile terminal both configured to perform the respective method steps. Moreover, a communication system is provided which comprises at least one base station and at least one mobile terminal. In order to decrease the interference caused by retransmissions, the present invention suggests the use of separated channels for initial transmissions and their retransmissions. In order to decrease the interference caused by retransmissions, the present invention suggests the use of separated channels for initial transmissions and their retransmissions.

The present invention discloses a method for the communication by utilizing a relay base station, which is characterized in that the relay base station of one or a plurality of the concatenation are connected into a wireless communication network, to perform the wireless connection with a service base station, when the service base station is communicated with a user terminal through the relay base station, the implementation procedure is as follows: the service base station or a user terminal sends the data to the relay base station; the relay base station sends the data sent by the service base station to the user terminal and sends the data sent by the user terminal to the service base station. The application of the method can reduce the construction cost of the base station and improve the flexibility of the network layout of a wireless communication system.

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.

A passive transponder is started up by receiving an interrogation signal and returning a requested response signal. The startup is controlled by an interrogator using a startup control method by judging presence or absence of a return of the response signal while monotonically increasing transmission power of the interrogation signal from an initial value by an amount which is made smaller stepwise every time presence of the return is judged and maintaining the transmission power, after presence of the return is judged, at its value as of the time when presence of the return was judged.

A method of link adaptation is described including establishing, using a first serving point, a multi-user full duplex mode wherein the multi-user full duplex mode enables a downlink to a first wireless device and an uplink from a second wireless device. The first serving point requests from the first wireless device a first channel quality indicator indicating channel quality between the serving point and the first wireless device in a full duplex time period and a second channel quality indicator indicating channel quality between the serving point and the first wireless device in non-full duplex time period. The full duplex mode is evaluated using the first and second channel quality indicators. At least one parameter of the full duplex mode is adjusted based on the evaluating.

An arrangement of an area covering, cellular radio communication network having cell regions which can be. contiguously replicated without interference. A central transceiver station is coupled to a base station controller and has a plurality of decentral transceiver stations surrounding and coupled to the central transceiver station. Groups of adjacent decentral transceiver stations are grouped in respective cell areas. All of the decentral transceiver stations in each cell area are allocated the same transmission frequencies, but the frequencies of each cell area are different from the other cell areas in the cell region.

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.

The invention disclose a method used for a system to control message sending and receiving, when the system control message changes, the network side attemper channel resource sends the changed system control message to the user equipment UE; the network side controls the message changing instruction through the sending system, and informs UE of reading the sent system control message. Based on the sending method, when the user equipment UE chooses a new subdistrict, or when UE receives the system message changing instruction information sent by the network side, the invention gets the position of the system control message through the system broadcasting message or the system message changing instruction information, and then the information on the position is read to get the system control information. The invention also discloses a system control message sending and a receiving device. By using the invention, the idlesse UE and the activated UE can be made to effectively receive the changed system control message.

An alarm reporting system and method for reporting alarms to a central monitoring station via low-power femtocells is presented. An alarm reporting system comprises a plurality of sensors, an alarm reporting module that receives alarm signals from the plurality of sensors, and a logic unit that generates an alarm message related to the alarm signal. The alarm reporting module further comprises a low-power cellular transceiver to transmit the alarm message to the femtocell. The femtocell is connected to a fixed network such as the internet.

A method and apparatus are provided for dynamically routing a plurality of simultaneous point-to-point communications through an array of repeating transceivers. Each repeating transceiver may simultaneously act as each of a transmitter of origin for one communication, a final receiver for a second communication, and a repeater for a plurality of other communications. When acting as a repeater, each transceiver applies programmed delays to information before re-transmitting, and these delays are programmed so as to route a communication through the array of transceivers along a designed path along which multiple re-transmissions from local repeating transceivers are received, aligned in time for constructive reinforcement, and retransmitted after dynamically programmable time delays.

The invention relates to a wireless sensor network system supporting IP protocol that sets normal wireless sensor node and central node. The system is multilayer classification network structure. The down layer has plural cluster and the central node harmonizing the sensor node, collecting the information and sending to gateway; the upper layer that connects to low layer cluster far away could take process the information to normal node. The central node connects to external network through gateway and could transmit to remote user. The gateway runs IPv4 or IPv6 protocol or IPv4/IPv6 double protocol. The invention simplifies the design for network.

A data transmission arrangement includes an energy supplier for supplying the data transmission arrangement with electrical energy; a determiner for determining useful data provided by a sensor element connected to the data transmission arrangement; a coder for channel coding of the useful data so as to obtain channel-coded data; a splitter for splitting up the channel-coded data into a plurality of data packets having a code rate smaller than one; and a transmitter for transmitting data packets which is configured to transmit the plurality of data packets via a communication channel with a time lag, provided that an amount of electrical energy that can be provided by the energy supplier is sufficient for transmitting the respective data packets at a standard transmitting power.

A communication system provided with a plurality of communication devices which communicate with each other, wherein each of the communication devices includes: a storage device which stores a first code for identifying the communication device to the exclusion of others, and a second code defined so as to differ from other communication devices on the basis of the first code and a predetermined reference value; a transmission device which transmits a signal including the first code and the second code to the other communication devices; a reception device which receives the signals transmitted from the transmission devices of the other communication devices; and a control device which performs calculation using the first code and the second code included in the signal received by the reception device, and the first code stored in the storage device, and identifies the signal according to whether or not the value obtained by the above calculation matches with the second code stored in the storage device.

A method and system for supporting an energy saving function in a communication system are provided. An evolved Node B (eNB) Element Management System (EMS) receives usage statistical data from an eNB and compares the usage statistical data with a threshold value. The eNB EMS determines whether to turn on or off power sources of Power Amplifier (PA) units connected to antennas corresponding to sectors included in a serving cell of the eNB according to the compared result, and transmits, to the eNB, a command message directing the eNB to turn on or off power sources of corresponding PA units according to the determined result.

This invention discloses a method for adjusting AP emission power including: computing the current channel quality of the AP to adjust its emission power, namely, when the current channel quality of AP is tested to be smaller than a preset lower limit adjustment value, the AP emission power is increased, when the quality is greater than a preset upper limit value, the emission power of AP is reduced, which discloses a system for adjusting AP emission power including: AC and AP and gets balance between information resource utilization and data transmission quality guarantee and applies ICMP for signaling interaction without changing the protocol contents of the MAC layer and the physical layer of current IEEE 802.11.

A system and method for transmitting data communications through air using a radio. The invention allows the user to select from a number of predetermined output transmission powers. When a lower output transmission power is selected the current drain to the associated amplifier is decreased thereby conserving battery power of the radio. In addition, a detector diode circuit combined with an adjustable gain amplifier combine to provide a feedback mechanism whereby the output transmission power of the radio is held substantially constant over a broad range of temperatures.

Layers or coats of materials with high dielectric constant or permittivity with very low conductivity are inserted in between radiofrequency (RF) coil or coil's conductive elements and the sample to enhance the signal to noise ratio (SNR), improve image contrast, and reduce the specific absorption rate (SAR) of magnetic resonance imaging or magnetic resonance spectroscopy instruments. The embodiments of the present invention can be used as an auxiliary device to the standard pre-constructed RF coils or incorporated with RF coil constructions for enhancing RF coil performances in both transmission and reception.