Abstract: A high frequency peak detector includes an operational amplifier, a transistor, a capacitor, and an average to peak conversion module. A first inverting input of the operational amplifier receives a high frequency input signal, a second inverting input of the operational amplifier receives a common mode voltage of the high frequency signal, and a non-inverting input of the operational amplifier is coupled to the output of the operational amplifier. A gate of the transistor is operably coupled to the output of the operational amplifier and the source of the transistor is operably coupled to a power supply. The capacitor is operably coupled to the drain of the transistor to provide an analog signal representing an average peak to common mode value of the high frequency signal and to a circuit ground. The average to peak conversion module determines a peak value of the high frequency signal based on the analog signal and the common mode value.

Abstract: A circuit arrangement for detecting a usable frequency channel includes first and second devices for performing frequency conversion. The first and second frequency conversion devices have respective local oscillator inputs to which respective local oscillator signals are applied. The local oscillator signals are at a common frequency and have a phase difference of precisely 90°. A complex polyphase filter has first and second filter inputs connected to respective outputs of the first and second frequency conversion devices. A detection arrangement is connected to outputs of the complex polyphase filter in order to detect a signal level. A further arrangement can vary the phase angle of a signal output from at least one of the frequency conversion devices.

Abstract: An apparatus for dynamic diversity signal reception based upon receiver-side link quality assessments includes two or more antennae. At least one switch is connected to the two or more antennae. A dynamic diversity controller is connected to the at least one switch. The dynamic diversity controller includes a link quality assessor to assess link quality and generate a link characterization value. A diversity configuration selector, responsive to the link characterization value, selectively activates the at least one switch to implement a dynamic diversity configuration. The link quality assessor includes a signal strength analyzer, a modem detector, and/or a MAC layer analyzer to assess the received signal and generate the link characterization value.

Abstract: A signal strength indicator circuit that includes a first amplifier configured to receive a first input signal from a first mixer and a second input signal from a second mixer;. The circuit also includes a second amplifier configured to receive a first set of differential inputs from the first amplifier. The circuit further includes a third amplifier configured to receive a second set of differential inputs from the second amplifier stage. Even further, the circuit includes an output port for emitting an output signal that is a rectified combination of the first input signal and the second input signal. Also, a method of processing signals input into a signal strength indicator circuit.

Abstract: The invention is based in particular on the following concept: to gradually increase the power (power ramping) that is used to send a preamble, said power being limited by at least one extreme value, in such a way that the transmission is repeated with a power that corresponds to the extreme value.

Abstract: The present invention relates to a wireless transmission apparatus. The wireless transmission apparatus is used for transmitting a RF signal by a selected power allocation to meet the requirement of specific transmission standard. The wireless transmission apparatus comprises a memory, a processor and a power data converting module. The memory is used for storing a plurality of predetermined original power data profiles. Each original power data profile comprises a plurality of predetermined first original power ramp data and a corresponding power allocation for transmitting the RF signal. The processor is used for controlling the data flow. The power data converting module converts the data of original power data profile to a corresponding data of transmission power data profile.

Abstract: An apparatus to monitor and control power is disclosed. The apparatus may include a detector unit to detect a forward power and a reflected power. The apparatus may also include a control unit to control switching of the forward power from a first load that may be a radiating load to a second load that may be a non-radiating load in response to the forward power exceeding a predetermined threshold value or a voltage standing wave ratio (VSWR) exceeding a selected threshold value.

Abstract: Disclosed is an apparatus for stabilizing a transmission power of a CDMA mobile communication terminal which adaptively stabilizes the transmission power according to a data rate. In case of transmitting the transmission signal having the maximum data rate with the maximum power, the variation of the transmission power is minimized by driving the stabilizing apparatus, and in other cases, the transmission power is controlled so as to keep a constant power without driving the stabilizing apparatus.

Abstract: A signal power detector includes an input coupling circuit, a rectifying operational amplifier, a comparator, and a charge pump. The input coupling circuit is operably coupled to receive a signal and to convert the signal into a first input and a rectifying input. The rectifying operational amplifier is operably coupled to receive the first input and the rectifying input and to produce therefrom a rectified output signal that represents a peak of the received signal. The comparator is operably coupled to compare the peak value of the signal with an output peak value to produce a comparison value. The charge pump operably coupled to convert the comparison value into a corresponding current that represents the output peak value.

Abstract: A signal power detector includes an input coupling circuit a rectifying operational amplifier, and a charge pump. The input coupling circuit is operably coupled to receive a signal and to convert the signal into a first input and a rectifying input. The rectifying operational amplifier is operably coupled to receive the first input and the rectifying input and to produce therefrom a rectified output signal that represents a peak of the received signal. The charge pump converts the rectified output into a corresponding current, wherein the corresponding current represents power of the signal.

Abstract: An apparatus is provided for measuring an output of a high-speed data transmission circuit. The apparatus includes a programmable reference voltage generator operable to generate a reference voltage that is variable between a plurality of levels. The apparatus also includes a quantizer to quantize an output of the high-speed data transmission circuit relative to the reference voltage level input thereto. Also included is a clock generator operable to generate a clock having a transitioning time (rise-time, fall-time or both) that is less than one quarter of a minimum switching period of the output of the circuit. Finally, the apparatus includes a sampler operable to sample the quantized output with the clock to produce a plurality of samples which measure the output of the circuit.

Abstract: The present invention selects a space-time encoding mode to use when transmitting with spatial diversity based on the receive diversity associated with a receiver device and the quality of the transmission channels based on information fed back from the receiver device. The selectable space-time encoding modes are preferably space-time transmit diversity encoding and a version of BLAST-type encoding. Further, modulation modes, error encoding rates, or a combination thereof, may also be based on the quality of the transmission channels and the available diversity of the receiver device.

Abstract: Disclosed are methods and apparatus for automatically installing and/or aligning antennas of wireless bridges in computer networks. In general terms, when a particular bridge is installed or aligned, an installation mode is triggered which automatically displays an indication of one or more signal strength levels of signals received into the particular bridge. In the automatic installation mode, the particular bridge automatically searches for a remote bridge with which it can associate. After a remote bridge is associated with the particular bridge, the signal strength received by the particular bridge from the found bridge is then displayed on one or more indicators, such as light emitting diodes. Thus, one can then adjust the antenna of the bridge until an optimum power level is achieved without using any specialized equipment, such as a voltmeter or laptop for interfacing with the bridge to obtain the signal strength indication.

Abstract: The purpose of the invention is to provide an accurate measurement of RF signal power transfer between a power amplifier circuit and an antenna in the presence of supply voltage variations, temperature variations and VSWR mismatch. Knowing the VSWR mismatch enables modification of a control loop for the PA and thus allows for output power adjustment in order to make the PA more efficient and robust against VSWR changes. Having an indication of power delivered to the load and the VSWR is desirable for many wireless applications especially in those applications where the PA can generate emissions that are out of band and all emissions subject to industry standards. In particular, the embodiments of the invention are applicable to wireless LANs (WLANs).

Abstract: A method and system for determining location and/or motion for one or more wireless devices communicating at short range (i.e. less than about 30 feet) with other wireless devices on a wireless network. Signal strength measurements are passed within communication frames between wireless devices which can be used to represent an inverse of the distance, wherefrom a distance vector is determined between wireless devices. Using multiple distance vectors from multiple wireless network devices, a 2-D or 3-D coordinate representation for position of each wireless network in 2-D or 3-D space can be calculated. These coordinates can be utilized for determining the precise traveled position of a specific wireless network device in motion and for establishing a motion sensing system. The motion sensing system can be configured as input to a user interface to control devices and systems which integrated within or connected to devices communicating on the wireless network.

Abstract: A transmitter includes a coupler (318) to measure output power. The output power is compared to a set value and a threshold. If the power is above the threshold, the gain of an output amplifier (316) is adjusted toward the set value. If the power is below the threshold, an extrapolation of the linear portion is used to obtain the set power level.

Abstract: Disclosed is a mobile communication system whereby, to reduce the connection time, a mobile station closely located to a base wireless station is permitted to continue to use a common channel for exchanging signals, and to suppress an increase in interference, an individual channel is set for a mobile station located near the edge of a cell, and to obtain a stabilized communication quality and to prevent an increase in the connection time, the probability that the transmission power will reach an upper limit is reduced. When communication between a mobile station and a wireless base station is started, the wireless base station measures the transmission power and the communication quality in the communication with the mobile station and the utilization ratio for a common channel, and compares the obtained values with predetermined threshold values. When the obtained values are lower than the threshold values, the wireless base station continues to use the common channel for signal transmission/reception.

Abstract: A method and system for establishing connection between two wireless devices. The method and system includes establishing connection authentication between the wireless devices, and measuring and the signal strength between the two devices. Predetermined values related to signal strength and signal rate change are established, and connection is allowed if the values are met.

Abstract: A device and method for controlling communication on a reverse link in a mobile communication system includes a measurer, a controller, and a reverse link transmitter according to an embodiment of the present invention. The measurer detects a power control bit from a channel signal received on a forward link and measures the reception strength of the channel signal using the detected power control bit. The controller compares the reception strength with a threshold and generates a signal for controlling transmission on a reverse link if the channel status of the forward link is determined to be bad during the comparison. The reverse link transmitter stops channel transmission on the reverse link in response to the transmission control signal.

Abstract: A high-speed digital received signal strength indicator (RSSI) circuit is provided.

Abstract: A system and method for applying an algorithm to distance measurements between nodes in an ad-hoc communications network. The algorithm is located at an individual node of the ad-hoc network and processes collected data via a multi-path filter to ensure that range measurement data is correct, and if so, include such measurement data in a historical data matrix in which old measurement data is eliminated. During periods where received signals are unable to provide correct distance measurements due to reflections affecting the path between nodes or media absorption or radio energy, distance estimates may be obtained from this accurate historical data.

Abstract: A method (300) and an apparatus (800) for determining duration of authorized usage time period are disclosed. A wireless mobile communication device (112) receives (304) a signal, measures (306) signal strength of the signal, determines (308) the duration of authorized usage time period based upon the measured signal strength, and requests (310) registration for the duration of authorized usage time period. A method (900) and a system (1300) for registering a wireless mobile communication device (112) in a wireless local area network (102) for a variable duration based upon wireless signal strength information are also disclosed.

Abstract: A wireless communication system includes base stations with adaptive antenna arrays that communicate with remote communication devices. The base stations monitor the power of uplink signals received from user terminals, and generate a downlink array pattern that directs signals toward desired users and directs nulls toward undesired users. A base station will increase the strength of the downlink signals directed to a desired user from which it senses an increasing uplink signal power and will deepen the null directed to an undesired user from which it senses an increasing uplink signal power. The remote devices monitor the quality of downlink signals they receive and increase the power of the uplink signal they transmit in order to improve received downlink signal quality.

Abstract: A particular cell of a hybrid time division multiple access/code division multiple access communication system has a base station and a plurality of user requirements. Timeslots having unacceptable interference for the uplink are estimated. Timeslots having unacceptable interference for the downlink are estimated. An availability list is produced. The availability list indicates available uplink and downlink timeslots having acceptable interference levels. Uplink and downlink timeslots are assigned using the availability list.

Abstract: A method is described for managing and monitoring the performances in digital radio systems. The idea of the invention provides for identifying the type of distorting phenomenon that possibly affects the monitored radio channel; in this way it is also possible to univocally connect, apart from the cause of degrade, the system performances with one of the performance monitoring methods commonly usable. In practice, the invention utilizes two distinct thresholds, each specific to the related corrupting source, and above all it provides an effective technique for discriminating which of the two thresholds is to be compared with the measure of the quality chosen. In a first preferred embodiment of the invention, the type of distortion present in the channel is identified on the basis of the error autocorrelation test at the threshold decision circuit.

Abstract: A method (900) and a mobile station (160) for autonomously determining an angle of arrival (AOA) estimation are described herein. The mobile station (160) may receive information associated with a plurality of sectors (200) from a base station (140) having a plurality of antennas. Each of the plurality of antennas may provide communication service to one of the plurality of sectors (200). The information associated with the plurality of sectors (200) may be an antenna pattern, a boresight, a downtilt, and a signal strength value associated with each of the plurality of antennas. Based on the information associated with the plurality of sectors (200), the mobile station (160) may determine an antenna gain difference, which in turn, is used to determine the angle of arrival (AOA) estimation.

Abstract: A data processing device such as an IC card is switchable between a terminal mode in which drive electric power and signals are supplied via exposed connection terminals and an RF mode in which drive electric power and signals are supplied via built-in antennas. The data processing device has an internal circuit for being supplied with drive electric power and signals from either the connection terminals or the antennas depending on the mode to which the internal circuit has been set. The internal circuit typically comprises a microprocessor. The data processing device also has a mode detector for setting the internal circuit to the RF mode in response to a predetermined radio wave applied to the antennas and setting the internal circuit to the terminal mode in response to a reset signal applied to a reset terminal which is one of the connection terminals.

Abstract: A method of remotely estimating the functionality of a preamplifier mounted adjacent an antenna at the top of a mast or tower and coupled to a base station via a transmission medium, such as a coaxial cable, includes taking noise and/or signal power measurements at the base station via the coaxial cable for the amplifier when both powered and unpowered. The ratio of the respective noise and/or signal powers, after the receiver noise figure at the base station and the cable loss (estimated or measured) including any connection device loss are accounted for, provides an estimate of the functionality of the amplifier.

Abstract: A linear compensation system of a digital TV relay or other apparatus preferably includes a transmitting unit configured to modulate a data to an intermediate frequency (IF) signal, up convert the IF signal to an RF signal, and amplify the RF signal to a predetermined level using a high power amplifier (HPA). The system also includes a linear compensation unit to preferably directly vary a step size of an adaptive equalizer according to whether a signal-to-noise ratio (SNR) or an error vector magnitude (EVM) for an output signal of the HPA satisfies an advanced television systems committee (ATSC) or other standard. The linear compensation unit is thus configured to output an improved linear compensation coefficient to a modulator of the transmitting unit.

Abstract: An active cancellation controller receives a signal strength indicator that indicates a power level of a coupled signal from a local wireless transmitter at a local wireless receiver. The active cancellation controller tunes an active cancellation circuit to reduce the signal strength indicator. The active cancellation circuit is to generate a cancellation signal to combine with the coupled signal at the local wireless receiver.

Abstract: A squaring circuit squares a radio transmission signal. A band-pass filter extracts a spectrum component corresponding to a desired channel, from that low-frequency component of the output of the squaring circuit, which occurs with a center thereof being present near a DC (Direct Current). A level measuring circuit measures the level of the extracted spectrum component. On the other hand, another band-pass filter extracts, from the output of the squaring circuit, a spectrum component corresponding to spectrum spreading due to a distortion in a transmission circuit. Another level measuring circuit measures the level of this extracted spectrum component. A level radio measuring circuit measures a ratio between the level measured by the level measuring circuit and the level measured by the other level measuring circuit, and produces the measured result as a ratio of a leak power to an adjacent channel.

Abstract: The present invention provides a power control device for controlling the transmission power of a signal transmitted between a mobile station and a base station in a mobile communication system via a radio channel. The device has an error judgment unit for receiving communication data transmitted in each communication unit having a fixed length via the radio channel, and judging whether or not said communication data has an error in each communication unit; and a target power control unit for measuring in each predetermined measurement period the number N of said received communication units and the number M of communication units which are judged as error by said error judgment unit, and changing said target power value based on a criterion value and said number M, or said criterion value and said numbers N and M, said criterion value being a criterion of change of said target power value and being determined according to said number N.

Abstract: The invention relates to a system for matching an antenna (ANT) for a wireless communication device, the system comprising: detecting means (4, 5, 12) to detect the matching of the antenna (ANT) and to generate a matching signal on the basis of the detected matching, control means (7) to examine said matching signal, to determine the need for matching, and to generate a control signal on the basis of said matching signal, and antenna matching means (9) to adjust the matching of the antenna (ANT) on the basis of said control signal. The invention relates also to a wireless communication device and a method for matching the antenna of a wireless communication device.

Abstract: A method and an apparatus for determining whether an object is moved are provided. The object is disposed in a communication system having many base stations. The apparatus includes a receiver, a controller, and a warning device. During a predetermined period, the apparatus respectively receives and measures signals from each of the base stations to derive a first average value. Meanwhile, a tolerable probability value is inputted. According to the tolerable probability value and the first average value, the apparatus gets a tolerable range. Next, the apparatus continues to receive and measure signals to derive a second average value. Finally, the apparatus determines whether the object is moved in accordance with the second average value and the tolerable range. If moved, the apparatus sends out a warning signal.

Abstract: A mobile communication system is composed of a plurality of base stations, a mobile terminal, and a base station controller. The base station controller selects a communication base station from among the plurality of base stations based on a velocity of the mobile terminal. The mobile terminal establishes a channel with the communication base station.

Abstract: A cellular system includes a mobile station and base stations, wherein the mobile station establishes a communication line with N first base stations wherein N is an integer (1?N), measures receipt quality in pilot signals transmitted from the N first base stations, determines M second base stations to make communication therethrough among the N first base stations, based on measurement results of the receipt quality, wherein M is an integer (1?M?N), and transmits an designation signal to the M second base stations through upward line to designate the M second base stations as a base station through which the mobile station makes communication, and each of the base stations makes communication with the mobile station, if designated by the designation signal, and does not make communication with the mobile station, if not designated.

Abstract: A portable telephone includes a speech transmission circuit, data transmission circuit, earphone/microphone detection circuit, and control circuit. The speech transmission circuit performs speech communication through an antenna. The data transmission circuit performs data communication through the antenna simultaneously with speech communication by the speech transmission circuit. The earphone/microphone detection circuit detects an obstacle that causes a deterioration in transmission efficiency of the antenna. When one of a data communication request during speech communication and a speech communication request during data communication is generated, the control circuit 11 determines on the basis of a detection result obtained by the detection circuit whether to permit/reject the request. A data communication control method for the portable telephone is also disclosed.

Abstract: The present invention relates to a method for adaptively controlling a transmission radiation pattern. Radio signals coming through a plurality of paths are received and demodulated for each path. The received level or received quality of each demodulated signal is compared to each other to select a signal with the highest level or most excellent quality. A path corresponding to a selected path is set at a path for transmission. When a plurality of signals each with an almost equal level or received quality exists in signals demodulated for each path, a history of transmission power control command (TPC) transmitted from a communication partner is referred. In other words, the reception condition in a communication partner is checked. Thereby, it is judged whether or not the currently selected path is appropriate as the path for transmission.

Abstract: A system and method for controlling transmitted output power of outdoor antenna units coupled to hand held wireless devices. When the antenna unit is operating with wireless network technology it may also be referred to as an outdoor unit. Transmit power level of an information signal is controlled in the outdoor unit by obtaining a control voltage from the hand held unit. The control voltage is used by the outdoor unit, to adjust the power level of the transmitted information signal. The transmit power level is adjusted by the outdoor unit performing the following steps: (1) detecting the transmit power level of the antenna unit, (2) determining whether the transmit power level is equal to a control voltage, and (3) adjusting the transmit power level based on the control voltage if the transmit power level is not equal to the control voltage. The adjustment of the transmit power level is accomplished by a closed loop circuit that maintains a constant loop gain.

Abstract: A system and method for classifying signals occurring in a frequency band. One or more characteristics of one or more signals in the frequency band are detected using any suitable technology, such as a device that can generate characteristics of signal pulses detected in the frequency band. Data pertaining to the signal pulses is accumulated over time. The accumulated signal data is compared against reference data associated with known signals to classify the one or more signals in the frequency band based on the comparison. The accumulated data may include one or more characteristics selected from the group consisting of: pulse center frequency, pulse bandwidth, pulse duration, time between pulses and number of different active pulses, and wherein the reference data associated with each of a plurality of known signals comprises one or more characteristics selected from the group consisting of: pulse center frequency, pulse bandwidth, pulse duration and time between pulses.

Abstract: An apparatus for monitoring a cellular communications system; comprising a plurality of voltage standing-wave ratio (VSWR) measurement means located at respective connections to antennas of said communications system and at respective discontinuities in radio transmission lines to said distributed antennas; wherein each said VSWR measurement means is individually identifiable, has a respective threshold, and is arranged to compare its measured VSWR value to its respective threshold and identifiably indicate an error status if its measured VSWR value exceeds its threshold. Also described is a corresponding method of monitoring a cellular communications system. Also described is a VSWR measurement apparatus, and an antenna arrangement comprising an antenna and such a VSWR measurement apparatus.