Abstract: Provided are a variable gain amplifier and a receiver including the same. The variable gain amplifier includes: a gain controller generating a gain control voltage; a variable gain amplifier amplifying an input signal and a feedback signal by using a voltage gain that is linearly proportional to the gain control voltage, and converting the amplified signal into a predetermined magnitude of a signal; and an offset canceller removing an offset from an output signal of the variable gain amplifier and outputting the offset removed result as the feedback signal. The variable gain amplifier includes a plurality of operational transconductance amplifiers.

Abstract: A mobile receiver having a multi-mode interference suppression function and a way to estimate its speed utilizes a parametric approach to interference suppression at high speeds, and a nonparametric approach at low speeds. In particular, if the mobile receiver is currently operating in a nonparametric mode and its speed exceeds a first predetermined threshold, the mobile receiver switches to a parametric mode. Conversely, if the mobile receiver is currently in parametric mode and its speed is less than a second predetermined threshold, the mobile receiver switches to nonparametric mode. In one embodiment, the speed may be estimated by a Doppler frequency in the received signal, and the thresholds are Doppler frequencies. In one embodiment, the first and second thresholds are different, creating a hysteresis in the mode switching.

Abstract: Method and system for synchronizing Access Points in a WLAN, such as a CSMA/CA Access Point. A method of synchronizing a first Access Point and a second Access Point includes the steps of deploying the first and the second Access Point within a wireless network and utilizing the first Access Point to detect a presence of the second Access Point. A first periodic Beacon Frame of the first Access Point is synchronized with a first periodic Beacon Frame of the second Access Point.

Abstract: The present invention provides a mobile communication terminal having broadcast reception function, capable of preventing occurrence of a situation in which sound comes out due to the activation of a television function even though the phone's silent mode is set. When the phone's silent mode is set in a television watching state, a CPU 1 determines that it is a television silent mode. Similarly, also when an ON operation is performed on a television function activation key in a state where the phone's silent mode is set, the CPU 1 determines that it is the television silent mode. When the CPU 1 determines that it is the television silent mode, the CPU 1 mutes television sound.

Abstract: A disclosed mobile radio communications system comprises an exchange station; first and second radio base stations configured to radio-communicate with a mobile station and configured to relay data from the mobile station; first and second radio control stations configured to wire-communicate with the first and second radio base stations, respectively, and configured to establish a wired communication path for relaying the data transmitted from the mobile station to the exchange station; a transmission device configured to wire-communicate with the first and second radio base stations, and configured to establish a local wired communication branch for relaying the data transmitted from the mobile station between the first and second radio base stations without going through the first or second radio control station; a third radio base station configured to radio-communicate with the mobile station, configured to relay the data transmitted from the mobile station, and incapable of communicating with the transm

Abstract: A direct conversion receiver (200) includes a low noise amplifier (LNA) (213), at least one baseband amplifier (119, 123 and 127), register banks (250 and 251) for storing a plurality of offset data corresponding to at least two LNA gain settings and a plurality of baseband gain settings, a DC offset correction system (235) for providing a DC offset signal, a state machine (275) for sequencing through each of the plurality of baseband gain settings and through enable and disable states for the LNA, and a processor (290) programmed to activate the state machine and to run the DC offset correction system.

Abstract: A mobile station apparatus communicates with a wireless base station apparatus to which closed-loop transmission diversity control is applied, the closed-loop transmission diversity control controlling phases of signals transmitted from two antennas based upon feedback information notified by the mobile station apparatus and transmitting the signals. The mobile station apparatus includes a control unit which determines whether to reflect an estimated phase result of the signals transmitted from the two antennas or not, depending on a channel type of signals transmitted from the wireless base station apparatus.

Abstract: Provided is a mixer including a mixing unit configured to mix high frequency data signals and local oscillation (LO) signals, generate first and second low frequency data signals, and output the first and second low frequency data signals to first and second output terminals, respectively; a common mode amplification unit coupled to the mixing unit, the common mode amplification unit configured to compare a common mode voltage of the first and second low frequency data signals and a predetermined reference voltage, the common mode amplification unit further configured to output a feedback signal at a control node based on the comparison; a first load transistor coupled to the first output terminal and the control node, the first load transistor configured to provide the first output terminal with a first load current corresponding to the feedback signal; a first calibration transistor unit connected in parallel to the first load transistor in order to calibrate an input impedance of the first output terminal;

Abstract: A STB 1 of this CATV system includes a diplexer 11, a signal level adjusting unit 30, a splitter 12, a tuner 2, a demodulating unit 3, a memory 17, and a CPU 19. The CPU 19 finds a correct reception level of a downstream signal by arithmetically operating a level correction value which is found based on a detected level adjustment state (state of switches) of the signal level adjusting unit 30 and a reception level after AGC which is found from signal intensity outputted from the demodulating unit 3, and notifies the found reception level to a CATV center station 40 by means of an upstream signal.

Abstract: An analog die (3) and a digital die (4) are supported by a plate (1) consisting of an electrically conductive material. Pads (5) of the dies (3, 4) are connected to each other, to plate (1) or to pins (2) surrounding the latter by bond wires (6). The upper side of the plate (1) is covered by a plastic mold (7) encapsulating the dies (3, 4), the bond wires (6) and, in part, the pins (2). For the suppression of external jamming signals as well as internal ones picked up by bond wires the digital die (4) comprises an adjustable notch filter which suppresses narrow frequency bands where jamming signals have been detected.

Abstract: Disclosed are a method, system, and computer program product for a Water Friend or Foe System (WFSS) including a Subscriber Identity Module (SIM) card in a SIM reader on a marine vessel. The WFFS system on the marine vessel transmits secure identity information and location information to a WFFS tracking station. The WFFS system on the marine vessel detects anomalies on the marine vessel and in response transmits an alarm signal to a WFFS tracking station and/or shuts down a propulsion system of the marine vessel. The WFFS system on the marine vessel can also receive a one-time “override” encrypted code to re-enable ship control of the propulsion system. The secure identity information and real-time vessel location are transmitted in one of: an Automatic Identifier System (AIS) message type or a Global Maritime Distress Safety System (GMDSS) message type.

Abstract: A power amplifier system includes a first power amplifier, a second harmonic generator, a phase shifter, and first and second adders. The first power amplifier amplifies a primary input signal. The second harmonic generator outputs a second harmonic by using a split part (signal) of the primary input signal as an input. The phase shifter adjusts a phase of the second harmonic. The first adder sums together a split signal of the primary input signal and an output of the phase shifter, thereby to produce an output. The second power amplifier uses the output of the first adder as an input. The second adder sums together an output of the first amplifier and an output of the second power amplifier, thereby to produce an output.

Abstract: One embodiment relates to an on-chip power amplifier (PA) test circuit. In one embodiment, a PA test circuit comprises a controllable oscillator (CO) configured to generate a radio frequency (RF) signal, a parallel resonant circuit tuned to the radio frequency, a pre-power amplifier (PPA) coupled to the CO and the parallel resonant circuit, the PPA configured to amplify and drive the RF signal from an output of the PPA into a load. The test circuit may further comprise a first transmission gate configured to couple the RF signal from the CO to an input of the PPA. One testing methodology for a PA test circuit comprises stressing the PPA with an RF signal, measuring a characteristic of the PPA, determining stress degradation from the characteristic measurements, and repeating the stressing and characteristic measurements until a maximum stress degradation is achieved or a maximum stress has been applied.

Abstract: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

Abstract: Systems and methods for dynamically controlling a tuner are provided. In exemplary embodiments, the tuner receives control signals generated by digital signal processing hardware (DSPHW). These control signals control noise figure and linearity characteristic of components within the tuner by adjusting a current supply to those components, according to a desired configuration determined by the DSPHW. As a result, the DSPHW can optimize power consumption of the tuner while allowing for sufficient tuner performance for reliable demodulation of received signals.

Abstract: A mobile wireless communications device includes a housing and circuit board carried by the housing. RF circuitry and a processor are operative with each other and carried by the circuit board. A receiver speaker and microphone are carried by the housing. Audio circuitry is carried by the circuit board and operative with the RF circuitry and processor. A microphone audio switch and receiver speaker audio switch are carried by the circuit board and are connected with audio connection lines that interconnect the processor. A filter is operative with the audio connection lines and operatively connected to at least one of the microphone audio switch or receiver speaker audio switch to reduce conducted and radiated interfering RF energy from coupling into the audio circuitry.

Abstract: A disclosed RF circuit includes a power amplifier that produces an RF output signal, a detector to generate a detector signal indicative of a power of the RF output signal, and an offset unit to produce an offset signal that indicates low supply voltage conditions. The power of the RF output signal is reduced, at least in part, by a control signal reflecting a combination of the detector signal and the offset signal. The circuit may include a transmitter to provide an RF input signal to the power amplifier. The transmitter may receive the control signal and adjust a power of the RF input signal based on the control signal. The detector may produce a control current indicative of the RF output signal power. The offset unit produces the offset signal based on a difference between the supply voltage and a nominal supply voltage value.

Abstract: Road noise is reduced without locally storing noise spectrum patterns for determination or without detecting the present position of a vehicle from the device. An in-vehicle hands-free device causes a cellular phone to detect the present position of the vehicle and transmit the position to a server. The server determines a noise spectrum pattern corresponding to the road surface on which the vehicle is presently running. The noise spectrum pattern is based on the present position of the vehicle received from the in-vehicle hands-free device and road information. The server transmits the noise spectrum pattern to the in-vehicle hands-free device whereupon a noise canceling signal is superimposed on a received signal. The noise canceling signal is based on an inverted noise spectrum pattern that is obtained by inverting the phase of the noise spectrum pattern. The resulting composite signal is output from a speaker.

Abstract: As explained above, according to embodiments of the present invention, by providing averaging section 111 that detects an average power value of amplitude component signals, and controlling transmission power based on the amount of drift in the average output power value of PA 103 and the amount of drift in the average power value of amplitude component signals, when residual drift components are included in the average output power value of PA 103, the influence of residual drift components can be eliminated and transmission power can be controlled, so that it is possible to improve the accuracy of transmission power control. That is, deterioration of power estimation accuracy resulting from residual drift components can be reduced, so that it is possible to satisfy the restrictive requirement that the difference between transmission power be within, for example, the range of +/?0.5 dB.

Abstract: According to an exemplary embodiment, a transmitter system includes a power amplifier receiving a supply voltage and a supply current from a power control/current detection circuit, where the power amplifier drives a load impedance. The transmitter system further includes a power correction module configured to sample the supply current and to cause a change in a control voltage, which corrects the supply voltage in response to a change in the load impedance. The supply voltage is corrected to cause the power amplifier to have a substantially constant output power. The power correction module is further configured to output a corrected peak voltage determined by an average value of the supply current. The transmitter system further includes a predistortion module configured to determine the control voltage from a product of the corrected peak voltage and an amplitude modulation component and to output the control voltage to the power control/current detection circuit.