43 results about "Transmitter power output" patented technology

A wireless local area network system comprises a 5.0+ GHz radio transceiver with two receiving antennas and one transmitting antenna. A transmitter power amplifier output is connected to the transmitting antenna through a 6–8 pole filter to control spurious signal output. Each receiving antenna is fitted with its own low-noise amplifier followed by a simple bandpass filter. Each bandpass filter feeds a diversity switch with a single output to a single receiver. The radio system constitutes a physical-layer (PHY) part of a wireless local-area network.

A target junction is illuminated with energy at a fundamental RF frequency and reflections from the non-linear junction are analyzed to determine the type of junction detected. The power output level of a transmitter emitting the illuminating signal is automatically controlled so as to drive the signal strength of the received signals towards a predetermined value, e.g. a minimum threshold value. An indication of the current received signal strength, adjusted by a factor so as to compensate for any automatic adaptation in the actual transmitter power output level, may be provided to an operator.

A gigabit ethernet line driver includes a transmitter having both transmitter and active hybrid outputs. The transmitter consists of a plurality of transmitter clusters each connected to both the transmitter and active hybrid outputs. Each transmitter cluster includes a plurality of transmitter cells consisting of a driver cell and digital to analog converter connected to driver cell. A hybrid circuit connects between the transmitter outputs and receiver inputs for separating a receiver signal from the transmitter signal responsive to a tuning signal.

A method and an apparatus for controlling transmitter power of a femto base station in a broadband wireless communication system are provided. In the method, a femto base station receives a signal having an intensity of a threshold or more from UE and transmits a message reporting power-on of a transmitter to a femto base station controller. The UE transmits a message reporting downlink signal measurement results of femto base stations to the femto base station controller via a macro base station. The femto base station controller determines a femto base station which becomes a handover target of the UE using report messages of the femto base stations and the UE. The femto base station controller transmits a handover procedure start message to the macro base station and the determined femto base station.

An apparatus, method and system for controlling a transmitter power level for direct device-to-device communications in a communication system. In one embodiment, an apparatus includes a processor and memory including computer program code. The memory and the computer program code are configured to, with the processor, cause the apparatus to monitor a feedback message from a base station to a user equipment participating in cellular communications employing a communication resource, and control a transmitter power level for device-to-device ("D2D") communications employing the communication resource as a function of the feedback message.

A blind spot detector system adapted to the exterior of a vehicle comprising at least one infrared light emitting diode (LED), an infrared photodetector and demodulator, and a microcontroller. The output power of the infrared transmitter is linearly modulated, enabling the blind spot detector to determine the proximity of the detected object. Furthermore, the transmitter output is frequency modulated to screen out random infrared radiation that might adversely affect the operation of the infrared photodetector. The system is calibrated to the position of the attached vehicle by linearly increasing the output power of the transmitter until the rear quadrant of the vehicle is detected when the transmitter is outputting power at a pre-determined calibration level. During normal operation, an object detected while the transmitted power is greater than a predetermined lower threshold and less than the calibration level will activate a LED indicator on the system housing.

An on-channel repeater has a receiving antenna for receiving an RF signal and a transmitting antenna for transmitting on the same frequency as the input signal. An amplification path between the antennas provides substantially linear processing and includes a combiner, a decorrelating delay and a power amplifier. A filter estimator receives a reference signal and the combiner output and generates a plurality of control coefficients which are applied to an adaptive filter which filters the reference signal accordingly and applies its output to the combiner. The reference signal is derived not from the output of the decorrelating delay but rather from the output antenna after the power amplifier. Where there is an adjacent transmitter generating potentially interfering signals, the transmitter output is coupled to the same transmitter antenna.

An optical transmitter is of the reflective modulation type and has a means of generating reflection, a mixer for mixing a data stream and a sub-carrier, and an optical modulator for modulating an optical carrier with the output from the mixer in order to avoid optical beat-interference noise arising from, for example, Rayleigh backscattering. The modulator is in one embodiment of the interferometric type such as a Mach-Zehnder Modulator (MZM) operated to suppress the optical carrier at the transmitter output in order to reduce optical beat interference noise. The modulator preferably implements CSS-AMPSK modulation, which suppresses optical beat noise and achieves strong dispersion tolerance, enabling, for example, 10 Gb / s data transmission over 100 km distance without dispersion compensation. The transmitter may have a duobinary encoder, which encodes the data prior to mixing with the sub-carrier.

A transmitter architecture having a single signal path or hardware to cover WCDMA / EDGE / GSM applications, and requires no SAW at the transmitter outputs. The transmitter architecture allows for a transmit convergence feature. A passive mixer with unique driver and furthermore using native devices available from the CMOS process for the mixer cores enables low voltage and low power design, low output noise and high linearity. A digital variable gain amplifier has the capability to cover wide output dynamic range operated from low supply voltage and interfaced digitally with the baseband circuit without DAC. A single transformer is used to combine the outputs from the WCDMA / EDGE and GSM drivers and subsequently convert the differential signal paths into a single-ended signal. RF switches are used to divert the output from the transformer to different bands and applications.

The invention relates to the technical field of mobile communication and provides a complementary-multiplicative power compensation method. The method comprises the following steps of: acquiring a detecting voltage of a power amplifier and an expected power voltage indicating an expected output power of communication equipment; comparing the detecting voltage of the power amplifier with the expected power voltage, and outputting a comparing result to an adjustable attenuator; and adjusting the transmitting power outputted to the power amplifier by the adjustable attenuator according to the comparing result. The invention also provides a complementary-multiplicative power compensation device and communication equipment. By using the complementary-multiplicative power compensation method and device or the communication equipment, the communication equipment can operate under the requirements on a large temperature range and a wide frequency band, and the transmitting power can keep stable.

For the purpose of reducing the size and power consumption of a power source in an ultrasonic diagnostic apparatus, charge pump circuits are connected to a transmitter power source. A regulator in the transmitter power source drives the charge pump circuit to generate a positive bias voltage +HV2 higher than a positive voltage +HV1 generated by the transmitter power source. The regulator in the transmitter power source also drives the charge pump circuit to generate a negative bias voltage −HV2 lower than a negative voltage −HV1 generated by the transmitter power source.

For the purpose of reducing the size and power consumption of a power source in an ultrasonic diagnostic apparatus, charge pump circuits (50 and 60) are connected to a transmitter power source (14). A regulator in the transmitter power source (14) drives the charge pump circuit (50) to generate a positive bias voltage +HV2 higher than a positive voltage +HV1 generated by the transmitter power source (14). The regulator in the transmitter power source (14) also drives the charge pump circuit (60) to generate a negative bias voltage -HV2 lower than a negative voltage -HV1 generated by the transmitter power source (14).

In a wireless local area network which includes access point having variable transmitter power levels, transmitter power data is sent from the access points to the mobile units and used by the mobile units in order to provide a corresponding variation in the transmitter power of the mobile unit.

The invention relates to a method for recognizing identification media in the communication area of a write / read device functioning according to the principle of inductive coupling in the MHz range, wherein an antenna is used for transmitting and receiving HF signals, in addition to a circuit for transmitting HF signals with a standard transmitter power output and a logic circuit for evaluating communication between a write / read device and an identification medium. A short inquiry signal consisting of several fundamental components of the HF field and having a standard transmission power output is periodically transmitted via a transmission path and the antenna and a response signal is detected on the antenna. The response signal is compared to a reference signal and a communication signal is transmitted in order to recognize an identification medium in the event that the response signal is different from the reference signal. This enables energy-saving, reliable recognition of identification media occurring in the field of communications for subsequent communication with the write / read device, particularly with respect to battery-operated write / read devices.

A computer-implemented method executed on a processor for outputting a smoothed photovoltaic (PV) power output from a battery of a power control system communicating with one or more microgrids is presented. The method includes curtailing an input signal received from a plurality of sensors, smoothing the input signal by employing a fuzzy logic based low pass filter having an adaptive window to generate a power reference command, applying a hard ramp rate limit to the power reference command, adjusting battery power output of the battery to satisfy battery constraints and a no-power-from-grid constraint, and distributing energy from the battery based on the adjusted battery power output.

A smart entry system comprises a communication section and a control device. Upon determination that a mobile device has continued to be present within a first transmission area for a predetermined time or over, the control device lowers first transmitter power output of a first electromagnetic wave to be transmitted from the communication section to second transmitter power output of the first electromagnetic wave so that the first transmission area is narrowed to a second transmission area until no more response is received from the mobile device. Then, the communication section not only transmits the first electromagnetic wave having the second transmitter power output and generating the second transmission area but also transmits, with a second cyclic period longer than the first cyclic period, a second electromagnetic wave, the second electromagnetic wave has the first transmitter power output and generates the first transmission area which is not narrowed.

A transmitter architecture having a single signal path or hardware to cover WCDMA / EDGE / GSM applications, and requires no SAW at the transmitter outputs. The transmitter architecture allows for a transmit convergence feature. A passive mixer with unique driver and furthermore using native devices available from the CMOS process for the mixer cores enables low voltage and low power design, low output noise and high linearity. A digital variable gain amplifier has the capability to cover wide output dynamic range operated from low supply voltage and interfaced digitally with the baseband circuit without DAC. A single transformer is used to combine the outputs from the WCDMA / EDGE and GSM drivers and subsequently convert the differential signal paths into a single-ended signal. RF switches are used to divert the output from the transformer to different bands and applications.

Certain aspects of the present disclosure propose methods for determining power level of one or more transmitters based on a power level of a primary transmitter (302) when the transmitters are located in close proximity of each other. The power levels may be determined such that a combined power of all the transmitters is compliant with regulatory radio frequency (RF) safety requirements. For certain aspects, power level of the lower priority transmitters (306) may be determined utilizing one or more look-up tables. For another aspect, power level of the lower priority transmitters may be calculated using an algorithm based on the power level of the priority transmitter. In aspects, the power level of lower priority transmitters and the time duration for which the transmitters are active may be selected dynamically so that the time averaged power of the transmitters for a defined period of time falls below the RF exposure limit.

Mid-level combining methods and systems that combine benefits of high level and low level combining methods for generating HD (High Definition) radio signal outputs. The High level IBOC combining technique combines the RF outputs of an analog transmitter with an IBOC transmitter operating in a combined digital / analog mode, and can include a properly phased, identical, analog component of the signal feeding the analog transmitter. The low level combining technique includes splitting and phase adjustment for the purpose of feeding the analog signal simultaneously to an analog transmitter and an IBOC digital transmitter operating in a combined digital / analog mode. The mid-level combining method and system uses attributes of the high and low level methods and systems. Another mid-level combining method and system is for high transmitter power output (TPO). Additional methods and systems for converting existing transmitter room spaces to HD (High Definition) radio transmitters, without having to add onto existing rooms and buildings.

A measuring system for performing over the air power measurements is provided. The measuring system comprises, within a single housing, a detector module, comprising a detector input, a transmitter module, comprising a transmitter output, and an antenna. The detector input and the transmitter output are at least temporarily connected. At least the transmitter output or the detector input are at least temporarily connected to the antenna.

The invention relates to a method for adjusting a duty ratio based on a neural network to realize maximum power tracing. Since a disturbance observation method has the defects of relatively slow convergence and difficulty in determining a maximum power point through oscillation, the disturbance observation method is improved, so that the method of the invention is provided. According to the methodof the invention, a BP neural network is adopted to establish the model of and predict the maximum power point of solar power generation; at the beginning, a voltage is directly adjusted, so that thevoltage reaches a predicted maximum value, and therefore, a condition that MPPT tracking for searching a true maximum power point tightly follows an intermediate process for finding a maximum power point can be avoided; when previous power output and later power output are equal or are within a certain range, the maximum power point is adjusted to be the median value of the previous power outputand later power output on the basis that the two sides of a P-U characteristic curve are close to be in symmetry, so that the maximum power point is closer to the true maximum output power point.

A distributed power control technique for wireless networking efficiently balances communication delay against transmitter power on each wireless link. Packets are transmitted over a wireless link from a transmitter to a receiver using a dynamically controlled transmit power level that is periodically updated at the transmitter. The transmit power is computed from i) an observed noise plus interference value of the wireless link and ii) a parameter that determines a balance between per-packet average delay and per-packet average power. In a preferred implementation, the dynamically to controlled transmit power level is computed by minimizing the sum of an average delay cost and an average power cost, weighted by the parameter.

The invention relates to a transmitter power output control method and device and a transmitter. The method comprises a table writing process and a table look-up process. The table writing process comprises the following steps: setting a transmitter to output at first output power; adjusting the second environment temperature, and obtaining corresponding second output power and second actual working temperature; grouping the second output power according to a preset unit power offset by taking the first output power as a reference to obtain a working temperature range of each group; and obtaining a first power offset of each group and obtaining a corresponding second power offset, and generating a relation table according to the working temperature range and the second power offset. The table look-up process comprises the following steps: acquiring a working temperature; obtaining a corresponding working temperature range and a second power offset from the relation table according to the working temperature, and obtaining a corresponding gain compensation value according to the second power offset; and adjusting the link gain of the transmitter according to the gain compensation value. By implementing the invention, the stable output power of the transmitter at different environment temperatures can be ensured.

The embodiment of the invention provides a transceiver module based on time division duplex and a processing method thereof, belonging to the field of communication. The transceiver module comprises at least one transmitter channel circuit, at least one receiver channel circuit and a radio-frequency built-in self-loop circuit, wherein the radio-frequency built-in self-loop circuit is connected between the transmitter channel circuit and the receiver channel circuit to form a closed-loop circuit, signals introduced into the transmitter channel output through coupling of the closed-loop circuit are transmitted to the receiver channel circuit as testing signals, the receiver channel circuit collect data from the testing signals, and the collected data are used as data for analysis to obtain the radio-frequency performance indicator of the transmitter channel or the performance indicator of the receiver channel. Due to the radio-frequency built-in self-loop circuit, the transceiver module has a circuit structure capable of transmitting back the signals of the transmitter channel output as the testing signals, thereby avoiding the use of the external testing apparatus during the test, reducing the testing cost, and improving the testing efficiency.

The invention discloses a magnetic coupling connector, comprising a connector transmitter and a connector receiver, wherein the connector transmitter includes a transmitter power output module and a transmitter data transceiver module, the connector receiver includes a receiver power receiving module and a receiver data transceiver module, the connector transmitter has no contact with the connector receiver, the electric energy is wirelessly transmitted to the receiver power receiving module of the connector receiver through the transmitter power output module of the connector transmitter in an electromagnetic induction manner, and data communication signals are transmitted between the transmitter data transceiver module and the receiver data transceiver module. According to the magnetic coupling connector disclosed by the invention, the inductive electric energy transmission can be realized through a magnetic coupling mode, the problem of mechanical contact failure can be overcome, and thus reliable transmission of the signals and electric energy can be achieved; the close magnetic coupling communication can be realized through various modulation modes; and the advantages of simple structure, low cost, flexible use, no mechanical wear, long service life and the like can be achieved.

Devices and methods for controlling a power supply of a wireless power transmitter based on the request of a wireless power receiver are disclosed. One embodiment provides a wireless power receiver. The wireless power receiver includes a power receiver circuit configured to receive power from a wireless power transmitter at a level sufficient to power or charge a load. The wireless power receiveralso includes a processor circuit configured to adjust a level of the received power being provided to the load based on a change in a level of received power to be requested to the wireless power transmitter. The processor circuit is further configured to send to the wireless power transmitter the request to change the level of the received power to a first different level.

The present invention relating to a video optical transmitter and receiver discloses a video optical transmitter and receiver capable of giving a power-off alarm. The present invention comprises an existing video optical transmitter and receiver, namely, comprises a transmitting terminal (1), a receiving terminal (2), network management unit (3) and a host computer (4) which are connected in order; a super capacitor (5) and an observation circuit (6) are also provided, and a power supply circuit (1.4), the super capacitor (5), the observation circuit (6) and a main processing circuit (1.7) are connected in order. The super capacitor (5) is a Farad capacitor with 1 farad capacitance, and the maximum working voltage is 5.5V; a main device of the observation circuit (6) adopts a single-chip microcontroller P89LPC935. According to the present invention, a transmitter power-off alarm can be reported to a network management center correctly, therefore the video optical transmitter and receiver has the characteristics of great convenience for using and maintaining, small increase of cost for the power-off alarm function and high cost performance.