142 results about "Power minimization" patented technology

Using at least one MIMO-capable transceiver allows weighting calculations for signals transmitted and received, and enables individual packets to adapt, in a scalable, flexible, and responsive fashion to the real-world dynamics of a continuously varying communications network environment. The method and system of this invention use adaptively-derived diversity means to rapidly and efficiently distinguish the desired signal from noise, network interference, and external interference impinging on the network's transceivers and can transmit with lessened overhead. ADC operations and signal transformations continuously update combiner weights to match dynamically-varying environmental and traffic conditions, thereby continuously matching necessitated signal and waveform transformations with environmental and signal effects and sources. Successive iterations of the adaptation algorithm let each node's multiport combiner and distribution weights approach the MIMO channel's Shannon capacity in high-rate networks, or to minimize power needed to close links at a specified rate in low-rate networks, e.g. Voice-Over-IP networks.

In a communications system, such as a Power-Over-Ethernet system, where power supply equipment (PSE) supplies power to powered requiring devices (PRDs), a system and method of dynamic power management is implemented. The system and method monitors the power consumed at each port by the PRDs. Based on this monitoring, the PSE dynamically determines the minimum power which can be allocated to each PRD, and so dynamically maximizes the available reserve power. The PSE maintains a queue or queues wherein PRDs are listed in order of a power allocation priority. When additional power is available, the PSE preferentially allocates power to a PRD or PRDs which have higher priority. The system and method of the present invention minimizes the power allocated to each individual network device, as a result of which the total number of network devices that can be supported with the available power may be maximized.

A dielectric waveguide integrated plasma lamp (DWIPL) with a body comprising at least one dielectric material having a dielectric constant greater than approximately 2, and having a shape and dimensions such that the body resonates in at least one resonant mode when microwave energy of an appropriate frequency is coupled into the body. A dielectric bulb within a lamp chamber in the body contains a fill which when receiving energy from the resonating body forms a light-emitting plasma. The bulb is transparent to visible light and infrared radiation emitted by the plasma. Radiative energy lost from the plasma is recycled by reflecting the radiation from thin-film, multi-layer coatings on bulb exterior surfaces and/or lamp chamber surfaces back into the bulb. The lamp further includes two- or three-microwave probe configurations minimizing power reflected from the body back to the microwave source when the source operates: (a) at a frequency such that the body resonates in a single mode; or (b) at one frequency such that the body resonates in a relatively higher mode before a plasma is formed, and at another frequency such that the body resonates in a relatively lower order mode after the plasma reaches steady state.

Provided is a dual antenna diversity transmitter and system having improved power amplifier efficiency, and further comprising switches in the dual antenna diversity transmitter and system, to minimize a DC input power consumed by the power amplifier depending on the required transmitting output power and operate efficiently the power amplifier, whereby signal linearity can be maintained and the power amplifier can be efficiently operated in a more simplified manner, as compared to the conventional high efficiency power amplifier.

Improving fingerprint image measurement despite damage to the stratum corneum. Determining whether a fingerprint image is adequate for matching with a database. If not, re-measure those image portions that are inadequate (overexposed or underexposed), such re-measuring a minimal selection of image portions. An amount of time or power to re-measure is minimized. Improving fingerprint image data collection despite fixed pattern noise like saturated bars in blocks of picture elements. Determining a histogram of grayscale values, removing fixed pattern noise, and expanding real histogram values to obtain more bits of precision.

A tunable actuator joint module of a robotic assembly comprises an output member and an input member, where the output member is rotatable about an axis of rotation. A primary actuator (e.g., a motor) is operable to apply a torque to rotate the output member about the axis of rotation. A quasi-passive elastic actuator (e.g., rotary or linear pneumatic actuator) comprising an elastic component is tunable to a joint stiffness value and is operable to selectively release stored energy to apply an augmented torque to assist rotation of the output member and to minimize power consumption of the primary actuator. The tunable actuator joint module comprises a control system having a valve assembly controllably operable to switch the quasi-passive elastic actuator between an elastic state and an inelastic state during respective portions of movement of the robotic assembly (e.g., a hip or knee joint of an exoskeleton). Associated systems and methods are provided.

The utility model relates to an evaporative type condenser. Inside the plenum chamber of the upper box body of the evaporative type condenser is provide with a second heat exchanger used for removing frog, the lower box body is provided with a first heat exchange connected in series and used for condensation. The invention also relates to an evaporative cooled condensing unit applies the evaporative type condenser and a water chilling unit, mainly to achieve the function of a first mode in the cooling and condensation of a refrigerating fluid and to achieve the function of a second mode and a controlling system in the suction and compression of the refrigerating fluid. Wherein the first mode integrated in parallel by at least one evaporative type condenser, the second mode comprises at least one compressor, and the first mode and the second mode are combinedly installed on a common base seat, the number of the evaporative type condensing devices comprises by the first mode corresponds to the number of the compressor comprises by the second mode corresponds or the power steps of at least one compressor. The invention controls the start of the evaporative type condenser and the fan and water pump of the evaporative type condenser through temperature; adjusting and controlling the working state of the evaporative type condenser and the fan and water pump of the evaporative type condenser through the environment temperature and the exhaust pressure value of the compressor to maintain the pressure of the compressor within the scope of the preset pressure value; minimizing the operating power of the fan and the water pump to achieve the dynamic match between the heat dissipation capacity of the evaporative condensing unit and the needed heat dissipation of the compressor in operation.

A method of controlling and regulating a rotorcraft presenting a speed of advance that is high and stabilized, the rotorcraft including at least a main lift rotor (10), at least one variable pitch propulsion propeller (6), and at least one power plant for driving the main rotor(s) (10) and at least one propeller (6), said method consisting in using a first loop for regulating pitch or attitude, and a second loop for regulating speed by means of a control over the mean pitch of the propulsion propeller(s) (6), wherein the method further consists in controlling the deflection angle of a horizontal tailplane (30, 25, 35) by using a third loop for controlling and regulating said deflection angle of the horizontal tailplane (30, 25, 35) in order to minimize the total power consumed by the main rotor (10) and the propulsive propeller(s) (6), for a given speed and attitude.

The invention discloses a resource allocation method in a multi-user cooperative relay system on the basis of power minimization. According to the method, by means of equivalent channel gain, a two-hop link in the system is converted into a virtual direct-transmission link, then the joint optimization problem related to subcarrier allocation, relay selection and power allocation is decomposed into the following three sub-problems that firstly, the number of subcarriers occupied by users is determined by means of a power minimization rule according to average channel gain and the target rate of the users; secondly, on the principle that the channel condition is optimal, the target rate of the users is taken into consideration at the same time, subcarrier allocation is carried out in the mode that the subcarriers are used for selecting the users and a relay, so that the situation that one subcarrier is allocated to multiple users is avoided, and computation complexity is reduced; thirdly, by means of combination of a water-filling algorithm and channel environment, power allocation is carried out, and the fact that the total power of the system is minimum is guaranteed. Besides, in the processes of subcarrier allocation and relay selection, energy loaded on the subcarriers is minimum, and therefore energy consumption of the system is reduced.

A noise suppression apparatus selectively uses an adaptive beamformer and fixed beamformer for each frequency. A direction of a null of the fixed beamformer is determined from a direction of a null automatically formed by the adaptive beamformer. Filter coefficients of the adaptive beamformer based on an output power minimization rule are calculated by a minimum norm method using a norm of the filter coefficients as a constraint. The above selection is made based on, for example, a depth of a null automatically formed by the adaptive beamformer in the selection.

Systems and methods are disclosed herein for providing improved cache structures and methods that are optimally sized to support a predetermined range of late stage adjustments and in which image data is intelligently read out of DRAM and cached in such a way as to eliminate re-fetching of input image data from DRAM and minimize DRAM bandwidth and power. The systems and methods can also be adapted to work with compressed image data.

A method and system provide multiple-access control and frequency band allocation, and transmission time sharing among multiple users in orthogonal frequency-division multiple-access (OFDMA) and time-division multiple-access (TDMA) networks. The method can be applied to uplinks and downlinks of multi-user, multi-carrier communication networks. Under a total transmission-power minimization constraint, the method can allocate carriers and transmission time to users optimally, and at the same time, can guarantee a data rate or equivalently a latency requirement of each user.

The invention relates to a wireless mobile communication system, in particular to a method for realizing self-adaptive resource distribution of orthogonal frequency-division multiplex multiple access system. The inventive method comprises that base station confirms the user number with access allowance (sub carrier distribution), the base station confirms the number and power of sub carriers distributed by each user, the base station decides the exact sub carriers distributed by each user. The invention resolves the problem for confirming the number of sub carriers when user requests to access system. Compared with traditional static sub carrier distribution, the invention is dynamic, which can distribute engouh sub carriers for each user with minimum system emission power, to realize frequency diversity. The invention can overcome the iteration confirm process of complex filling level in filling algorism, to avoid iteration and simplify operation.

The invention discloses a robust precoding method of a multi-beam satellite communication system based on outage probability constraint. The method comprises the following steps: firstly, consideringthe channel long delay characteristics in the satellite mobile communication system, using random variables to characterize the channel phase uncertainty caused by the channel state information feedback delay and the like, and modelling a robust precoding problem as a power minimization problem based on the outage probability constraint in accordance with the channel model; then, converting a probability constraint condition into a low-complexity approximate representation form that is convenient to solve based on the central-limit theorem and the Gaussian distribution; and finally, convertingthe initial power minimization problem into a convex optimization problem through positive semidefinite relaxation, and obtaining a precoding vector of each user group by using a Gaussian randomization method. Compared with the traditional transmission method in which the channel information uncertainty is not considered, the robust transmission method based on the outage probability constraint proposed by the invention has the advantages of greatly reducing the transmission outage probability and improving the transmission performance of the multi-beam satellite communication system.

The invention proposes a robust transmission method suitable for a multicast multi-beam satellite mobile communication system. The method includes the following steps: firstly, considering the channellong delay characteristics in a satellite mobile communication system, and performing user grouping based on an average Euclidean distance criterion in the case that a gateway station only knows partof the channel information; and then, considering the characteristics that the channel amplitude remains basically unchanged and the channel phase changes rapidly during the long delay, adopting a random variable to characterize the channel phase uncertainty caused by the channel state information feedback delay, calculating a mathematical expectation of a signal-to-interference-to-noise ratio (SINR) of a user with respect to the random variable to obtain an average SINR, and further modeling a precoding problem as a power minimization problem; and finally, solving the power minimization problem by using semi-definite relaxation and Gaussian randomization methods to obtain an optimal precoding vector for each user group. Compared with a conventional method that does not consider the outdated channel information, the robust transmission method proposed by the invention can significantly improve the system performance.

In the contemporary data center industry, energy consumption of air conditioning systems accounts for a large proportion of total energy consumption, so how to reduce the total energy consumption of air conditioners and servers is what the industry and the academia focus on. The present invention provides a data center energy consumption optimization resource control algorithm under a server average temperature constraint. With quality of service and a server average temperature constraint ensured, an average temperature-aware power minimization model (called ATPM for short) is established, and a Lyapunov optimization theory is used in an algorithm to approximately solve an ATPM problem. The algorithm does not need to measure statistical information of a workload in advance, and the algorithm is low in complexity and easy for implementation.