Abstract: An output power control device is provided with an isolator, to which a transmission signal, that has been power amplified by a power amplifier, is input. The transmission signal is input via a transmission line connected to an output side of the power amplifier. The isolator only passes a progressive wave component of the transmission signal. The output power control device also includes a detection circuit for forming an actual output power detection signal by extracting part of an output power from a point of input of the isolator. Further, a reactance adjusting element connected to the point of input of the isolator cancels a parasitic reactance associated with the extracting section of the detection circuit.

Abstract: A circuit for simultaneously mixing two input signals and providing an output signal at double the frequency of one of the input signals includes a push-push doubler formed of dual-input mixing elements. Each input signal is coupled to the doubler/mixer through a phase-inverter to provide odd-mode input signal components.

Abstract: A communication system and methods for sharing a common communication frequency, without interfering with a second communication system which has a plurality of satellites operating in geostationary orbits (GO) and ground stations (GS) which communicate with the satellites (GEO) on the common communication frequency, is disclosed. Conventional geostationary satellites broadcast in C and K.sub.u bands. Ground stations (GS) which receive these signals must have their antennas pointed toward the plane of the Equator (EQ). Satellites (10) which occupy inclined orbits (LO) and communicate with terrestrial terminals (12) propagate beams of energy that do not intersect the plane of the Earth's Equator. Terrestrial terminals (12) in the northern hemisphere communicate with a satellite (10) only when the sub-satellite point of the satellite (10) is at a latitude more northerly than the terrestrial terminal (12).

Abstract: A threshold limit representing the number of handovers allowed to be performed by a mobile station within a predetermined period of time is assigned to a serving mobile network. In case a fast moving mobile station exceeds the prescribed number of handovers, a cell selection in accordance with the hierarchical cell location method is overruled. Instead, a cell selection in accordance with the normal cell location method is implemented to reduce the number of future handovers by the fast moving mobile station.

Abstract: A communication system and method, particularly adapted for use in adaptive antenna arrays, are presented. A plurality of signals containing a desired signal, interference, and noise are received through an array of antennas connected to a base receiving station. The signal arriving at each antenna is weighted according to computations which adjust those weights as a function of received interference and noise power in an unequal manner, based on the estimation accuracy of the interference and noise, which in turn depends on factors such as interference to noise power ratios and fading rate.

Abstract: In accordance with the present invention, an RFID system has a homodyne receiver having two outputs; the in-phase or I output and the quadrature or Q output. The modulated backscattered signal is composed of an information signal, modulated onto a single frequency subcarrier signal, generating a modulated subcarrier signal; this modulated subcarrier signal is then backscatter modulated onto the incoming RF signal. To demodulate this modulated backscattered signal, the I and Q outputs are combined using an IQ combiner. This IQ combiner introduces a 90.degree. phase shift, with respect to the frequency of the subcarrier signal, onto one of the demodulator outputs and then combines the outputs of the demodulator.

Abstract: A message sender (120, 700) and an output controller (110, 600) having an output configuration recover from a configuration error in a communication system. The output controller defines (404) a current output configuration tag (220) for identifying a current output configuration (212) in response to the output configuration being changed to the current output configuration. The message sender sends (506) to the output controller a recorded configuration tag corresponding to the output controller, in response to having a message to send to the output controller. The output controller and the message sender cooperate (512) to recover from the configuration error produced when the recorded configuration tag is different from the current configuration tag.

Abstract: A resource allocation device (101, 104) utilizes a method for allocating communication resources (124-129) among groups of communication units (106-109, 111-113, 115). The resource allocation device receives a call request from a communication unit of a first group of communication units. Responsive to the call request, the resource allocation device allocates an available communication resource to communication unit based at least on a quantity of communication resources currently being utilized by the first group of communication units.

Abstract: In a portable telephone, when the portable telephone is used for telephone on-vehicle use, the content of displaying is easy to recognize because character size to be displayed is capable of enlarging voluntarily. An input circuit is interfaced with an on-vehicle equipment (not illustrated). An on-vehicle connection detecting circuit detects connection to the on-vehicle equipment, thus outputting on-vehicle detection signal. A selection control circuit outputs an enlargement instruction signal instructing whether it allows normal size of character used on portable condition to display or it allows enlarged size of character to display after receiving an on-vehicle detection signal, and outputting displaying control signal after receiving a hook detection signal. A character storage circuit outputs stored character data after receiving the enlargement instruction signal or the displaying control signal. A displaying control circuit outputs a displaying signal after receiving the character data.

Abstract: An automatic emergency alarm reception apparatus for a broadcasting receiver which has a radio frequency part and a low frequency part, comprising an ON/OFF switch connected between the radio frequency part and the low frequency part, for turning on the broadcasting receiver when a specific frequency signal indicative of a state of emergency is received at an antenna of the broadcasting receiver, and an emergency alarm signal detection circuit for detecting the specific frequency signal from the radio frequency part to control the ON/OFF switch. The emergency alarm signal detection circuit includes an air defense alarm signal detection part and an air-raid alarm signal detection part. The air defense alarm signal detection part is provided with a band pass filter, a level comparator, an inverter, a pulse generator and a counter. The air-raid alarm signal detection part is provided with first to third band pass filters, first to third level comparators and a sequential detector.