64results about How to "Control transmit power" patented technology

The invention provides a wireless sensor network based on a dynamic routing mechanism, and a topology control method for the wireless sensor network. The wireless sensor network consists of a sensor node, a convergence node, and upper computer software. The method mainly comprises three steps: firstly building network topology through the dynamic routing mechanism; secondly carrying out estimation according to RSSI and LQI indexes, and then adjusting the emission power of the sensor node; and finally carrying out the maintenance of the structure of the network topology, thereby guaranteeing the connectivity and reliability of the network. The method based on power control can reduce the interference among signals, improves the stability of the network, and prolongs the life cycle of the network.

The invention relates to the field of cognitive radio (CR) and cellular mobile communication, in particular to a differential game-based CR system power control method. The control method comprises the following steps of: 1) constructing a CR system model; 2) designing a power extraction cost function and a power radiation hazard cost function; 3) constructing a power control differential game model; and 4) resolving feedback Nash equilibrium. In the method, the dynamic property of time continuity of an actual CR system is described well, a non-cooperative differential game model for controlling CR system power is established, a differential game-based distributed non-cooperative power control method is provided, and a feedback Nash equilibrium analytic solution is acquired. Through power control in a distributed non-cooperative power cognitive differential game (DNPCDG) algorithm, interference among cognitive users is effectively suppressed, so that total throughput is increased, and system performance is improved.

The invention provides a method for adjusting launching power of a subscriber station and a device therefor. The method mainly comprises the steps as follows: Sounding signal sent by the subscriber station is received and carrier wave interference noise ratio (CNIR) of the Sounding signal is obtained; CNIR of the Sounding signal is compared with the preset threshold value; and the launching powerof the subscriber station is adjusted according to the comparison result. The invention can realize the effective control of the launching power of MS on the basis of the Sounding signal sent by the MS and the preset threshold value, so as to control the Sounding launching power of the MS and meet the requirement of Sounding-based channel estimation method.

This invention discloses a method for controlling power of a UE, which pre-sets a monitor period and a RNC receives the UE communication data from the base station and determines the retransmission times of the UE data, when the period is full, the RNC gets the overrun times of the retransmission of the UE communication data in the period based on the retransmission times and the threshold value set before hand to decide the communication data volume should be received by the UE in the period to compute the target value of a new SIR to control the UE to adjust the emission power based on the target value.

This invention relates to a design method for automatic power control module under the burst out mode of terminals in a TD-SCDMA radio communication system and its circuit, in which, the emission power is adjusted for two or over two times of time intervals of adjustment and user terminals compute the necessary emission power values according to the signal intensity received and compute the step times, time length of the step or the power value increased or reduced each time necessary for adjusting the user terminals to reach the required emission power values so as to control the emission power of the user terminal to reach to the needed one.

The invention is concerned with the controlling method that the two high-speed up link grouping accesses the down controlling channel power. One method is : confirms the channel emission power by the TPC emission power and the channel correspond fixing power off-set; another method is: processes adjustment for HICH emission power according to the condition of ACK on the HICH channel, and confirms the RGCH emission power according to the fixing power off-set of the HICH that corresponds with the RGCH. The invention can control the emission power of the HSUPA down controlling channel RGCH and HICH effectively, makes the emission power minimum.

Interference that occurs during wireless communication may be managed through the use of fractional reuse and other techniques. In some aspects fractional reuse may relate to HARQ interlaces, portions of a timeslot, frequency spectrum, and spreading codes. Interference may be managed through the use of a transmit power profile and/or an attenuation profile. Interference also may be managed through the use of power management-related techniques.

Interference that occurs during wireless communication may be managed through the use of fractional reuse and other techniques. In some aspects fractional reuse may relate to HARQ interlaces, portions of a timeslot, frequency spectrum, and spreading codes. Interference may be managed through the use of a transmit power profile and/or an attenuation profile. Interference also may be managed through the use of power management-related techniques.

The invention discloses a power allocation method and a power allocation device in a multiple input multiple output open loop region. The method comprises that: when the available subcarriers of a base station are mapped to F frequency subregions, and a multiple input multiple output (MIMO) open loop region is set in the ith frequency subregion, then the data subcarrier power p2 of the MIMO open loop region in the ith frequency subregion is in accordance with the following condition: Pout is less than or equal to Pmax; wherein detaFi is power difference between a frequency subregion Fi and a frequency subregion F0, i is more than or equal to 0 and less than or equal to F, and the F is more than or equal to 1, the Pmax is the maximum value of the total transmission power of each orthogonal frequency division multiplexing (OFDM) symbol, the Pout is the total actual transmission power of each OFDM symbol; Nused is available subcarrier quantity in each OFDM symbol; and deta1p and deta2p are power constraint values, and are more than or equal to zero. The invention also provides a power allocation device in the multiple input multiple output open loop region. By the method and the device, the interference of the whole network can be reduced to a certain level so that the service quality of cell-edge users and the frequency spectrum efficiency of the whole network are ensured.

The invention relates to a method for the regulation of transmission power of a user terminal in a radio communication system, whereby a scaling of a transmission power of a first channel is only carried out independently of a scaling of a transmission power of at least one second channel, when the regulation of the transmission power is not oriented to the first channel.

The invention provides an expansion adapter for an ultrahigh-frequency FRID reader-writer. The expansion adapter for an ultrahigh-frequency FRID reader-writer comprises a reader-writer, a power amplifier connected with the reader-writer, an antenna switching device connected with the power amplifier, multiple antennas connected with the antenna switching device, and a main controller, wherein the scope of the frequency range of the multiple antennas is between 902MHz to 928 MHz; the main controller is connected with the reader-writer, the power amplifier, and the antenna switching device and is used for performing information interaction with the reader-writer, adjusting the amplification coefficient of the power amplifier, and controlling the antenna switching device to switch among the multiple antennas. The expansion adapter for an ultrahigh-frequency FRID reader-writer is capable of controlling the transmitting power of the antennas and providing a uniform reader-writer interface to external devices.

The invention discloses a method and apparatus for transmitting and receiving a signal in a communication system supporting device todevice scheme. The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for transmitting a device to device (D2D) discovery signal by a user equipment (UE) in a communication system supporting a D2D scheme is provided. The method includes determining transmission power for D2D discovery signal transmission, and transmitting a D2D discovery signal using the transmission power, wherein the transmission power is determined by considering a cell at which the D2D discovery signal is transmitted.

The invention discloses a wireless transmitting power prediction control method for reliability demand constraint of an intelligent substation, and the method comprises the steps: constructing a wireless signal propagation state space equation with state observation through the analysis of the relation among reliability, a signal-to-noise ratio and transmitting power and the utilization of a lossmodel and a Kalman filter of wireless signal propagation; performing expected signal-to-noise ratio compensation by estimating a confidence interval of signal-to-noise ratio fluctuation in real time;finally, defining a quadratic cost function taking the difference between the transmitting power and the actual signal-to-noise ratio and the expected signal-to-noise ratio as a target, and realizingoptimal control of the transmitting power through a dynamic programming algorithm. According to the invention, the problem of coordination between the transmitting power of the wireless sensor networkand the wireless communication reliability in the transformer substation environment can be solved, so that the transmitting power of the node is reduced as much as possible while the wireless communication reliability is ensured.

The invention relates to a laser power control method and a laser. The laser comprises a light transmitting element, a light receiving element, a grating lens and a processor, wherein the light transmitting element is used for transmitting light; the grating lens is used for dispersing the transmitted light; the light receiving element is used for receiving the reflected light generated during theprocess of dispersing the transmitted light by the grating lens and converting the reflected light to current signals; and the processor is used for controlling the light transmitting power of the light transmitting element according to the current signals. Thus, the reliability of an infrared laser is improved.

The invention discloses a depth sensor, a detection system and a method for controlling the transmission power of the sensor. The method comprises the following steps: acquiring priori information ofa working environment to be tested; presetting the prior information of the working environment to be tested; performing calculation according to the preset priori information of the working environment to be tested and detection information to obtain position information and orientation information of an active sensor; calculating maximum transmission power according to the position information and the orientation information of the active sensor, and correspondingly dynamically adjusting the transmission power of the active depth sensor according to the maximum transmission power. The depthsensor, the detection system and the method for controlling the transmission power of the sensor have the advantages that the transmission power is intelligently dynamically adjusted and controlled and the power consumption of a device provided with the active depth sensor is reduced.

The invention discloses a radar sampling interval control method based on an improved recurrence method. Firstly, a relation of change of radiant power and residence time of a radar with target distance is obtained based on a radar detection model and a passive interception theory; and for further reducing radiant power of the radar, radar sampling interval, as a time resource control strategy, isintroduced. The method provided by the invention has the advantage of determining the next moment of radar radiation according to a result of comparison between a threshold and a filtering residual value in an airborne radar filtering algorithm. By Monte carlo simulation, in comparison with other algorithms, a radar sampling interval control algorithm provided by the invention can obtain greateraverage sampling interval under premise of approximately identical precision, and is beneficial for improving radio frequency stealth performance of the radar.