摘要:
A wireless relay amplification apparatus includes an interference canceller which generates cancellation waves to cancel interference waves from a mobile station antenna, which are included in downlink signals received by the base station antenna, a downlink amplifier which amplifies downlink signals from which the interference waves have been canceled by the interference canceller, an uplink amplifier which amplifies uplink signals received by the mobile station antenna, a receiver which detects a level of received signals based on the downlink signals from which the cancellation waves have been canceled by the interference canceller, and outputs a propagation loss calculated based on a difference between the detected reception level and a transmission level of the base station included in notification information in the downlink signals, and a controller which controls gain of at least one of the downlink amplifier and the uplink amplifier based on the propagation loss output by the receiver.
摘要:
A wireless relay amplification apparatus includes an interference canceller which generates cancellation waves to cancel interference waves from a mobile station antenna, which are included in downlink signals received by the base station antenna, a downlink amplifier which amplifies downlink signals from which the interference waves have been canceled by the interference canceller, an uplink amplifier which amplifies uplink signals received by the mobile station antenna, a receiver which detects a level of received signals based on the downlink signals from which the cancellation waves have been canceled by the interference canceller, and outputs a propagation loss calculated based on a difference between the detected reception level and a transmission level of the base station included in notification information in the downlink signals, and a controller which controls gain of at least one of the downlink amplifier and the uplink amplifier based on the propagation loss output by the receiver.
摘要:
A belt feed apparatus, includes: an endless belt member; a belt back surface member including a close portion disposed close to the endless belt member to such a degree that, when the endless belt member stands stationary, the close portion is prevented from touching the endless belt member, and while the endless belt member is circulating, the close portion can be contacted with the endless belt member irregularly; and a non-sticking portion that includes a non-sucking surface contactable with the endless belt member to prevent the endless belt member from being electrostatically sucked to the close portion, the non-sucking surface being provided in an entire portion or part of a surface of the close portion opposed to the endless belt member, and due to the existence of the non-sucking surface, the non-sticking portion being able to prevent the endless belt member from sticking to the close portion.
摘要:
A distortion compensator compensates for distortion arising in an amplifier that amplifies a signal with improved efficiency. The distortion compensator includes a signal level detector which detects the level of a signal to be amplified by an amplifier, a distortion compensation execution unit which executes distortion compensation on the signal to be amplified according to a mode of distortion compensation corresponding to the signal level detected by the signal level and a correspondence between signal levels and distortion compensation control values as pairs, a distortion compensation control value correspondence updater which updates the correspondence between the signal levels and the distortion compensation control values used in the execution of distortion compensation, and a distortion compensation control value number controller which controls the values of stipulated parameters.
摘要:
To provide an amplifying device which is reduced in size, weight and cost and which can improve the distortion compensation performance. In the amplifying device, input signals are each subjected to digital orthogonal modulation using an IF and further to offset rotation processing in digital orthogonal modulators, then bifurcated into a main signal system and a control system, and detection of a power value is performed at an IF band in a power detecting section of the control system. Therefore, offset rotation processing of the input signals in the power detection is not required, so that a structure for matching phases of a multi-carrier signal and a power value signal is not required, resulting in improving the distortion compensation performance without using an analog delay line.
摘要:
A cleaning body has: a shaft; a cleaning member that is spirally wound around the shaft, and that has an elastic layer and an adhesive layer whose obverse is adhered to the elastic layer and whose reverse is adhered to the shaft; and a contacting member that is provided at least one end portion in an axial direction of the shaft, and that contacts the adhesive layer at a position away from an circumferential surface of the shaft. The cleaning body causes the elastic layer to contact a body to be cleaned, and cleans a body to be cleaned.
摘要:
A belt feed apparatus, includes: an endless belt member; a belt back surface member including a close portion disposed close to the endless belt member to such a degree that, when the endless belt member stands stationary, the close portion is prevented from touching the endless belt member, and while the endless belt member is circulating, the close portion can be contacted with the endless belt member irregularly; and a non-sticking portion that includes a non-sucking surface contactable with the endless belt member to prevent the endless belt member from being electrostatically sucked to the close portion, the non-sucking surface being provided in an entire portion or part of a surface of the close portion opposed to the endless belt member, and due to the existence of the non-sucking surface, the non-sticking portion being able to prevent the endless belt member from sticking to the close portion.
摘要:
With an amplifier configured by including Doherty-type amplifier sections 21 to 25, the area of the circuits is reduced so that the size reduction is achieved. Moreover, the properties of the Doherty-type amplifier sections (Doherty properties) are stabilized against any environmental change of humidity and temperature. As an example, the permittivity of a substrate 3 configuring one or more of quarter wavelength lines 23 and/or 24 included in the Doherty-type amplifier sections 21 to 25 is increased compared with the permittivity of a substrate 2 in a close range. As another example, a line portion forming an output circuit of a carrier amplifier in the Doherty-type amplifier sections is configured by using a substrate material being physically stable against either or both of any change observed in the humidity and the temperature.
摘要:
The present invention relates to an economical and highly reliable receiving apparatus for receiving radio signals transmitted from a mobile communication terminal within radio zone. The receiving apparatus has antenna sections that receive radio signals transmitted from the mobile communication terminal and are provided in each of a plurality of sectors divided from the radio zone, and receiving units that are provided in each of the antenna sections and that perform a predetermined process to the radio signals received by the antenna section.
摘要:
To provide an amplifying device with reduced size, weight and cost. The amplifying device delays input signals using digital delay sections in a main signal system, performs offset rotation processing of digital input signals in carrier offset sections and power detection in a power detecting section in a control system, matches phases of a multi-carrier signal of the main signal system and a power value signal of the control system in a phase control section, and gives distortion compensation in a predistorter for canceling a nonlinear characteristic generated in an amplifier.