Abstract: A disclosed wireless communication device performing transmission and reception in a time-division manner includes an antenna, a transmission unit, a reception unit, a transmission/reception switchover unit, a first path switchover unit, a directional coupler, a second path switchover unit, a first fault diagnosis unit, and a second fault diagnosis unit. The second fault diagnosis unit causes the second path switchover unit to form a reflection signal input path; causes a second transmission signal level-adjusted for fault diagnosis to be outputted from the transmission unit; acquires a signal level of a reflection signal from the antenna inputted from the directional coupler into the reception unit; and determines whether or not a transmission radio wave is normally emitted from the antenna based on the signal level of the reflection signal.

Abstract: A method and apparatus for using an antenna selection signal for selecting a transmit diversity parameter, including phase difference and/or power ratio between concurrently transmitting antennas.

Abstract: A mobile device has operating resources available to it. A measurement generator provides measurements of the operating resources and a context awareness engine identifies which of the operating resources may be efficiently utilized by a service application in view of context conditions in which the mobile device is operating. A selection controller selects, based on the measurements, at least one of the identified operating resources for use by the service application to improve or optimize a cost of the mobile device.

Abstract: A system for performing wireless local area network testing of wireless devices may include a wireless local area network tester and a device under test. The tester and device under test may communicate over a wireless link. To ensure that the tester accurately analyzes test data, a data rate table is used that specifies fixed data transmission rates to be used by the device under test under both high-quality link conditions and low-quality link conditions. This forces the device under test to transmit control packets at the same high data rate during packet loopback testing, regardless of link quality. When the captured control packets are analyzed at the tester, both low-link-quality data and high-link-quality data may be analyzed using a common test template, ensuring accurate results.

Abstract: A wireless communication system is disclosed including a MIMO wireless communication apparatus that can communicate through multiple antennas and a non-MIMO wireless communication apparatus that can communicate through a single antenna or multiple antennas. The MIMO wireless communication apparatus includes a communication unit configured to transmit and receive control information divided into a second control information containing information related to the demodulation and decoding of traffic channel and a first control information containing information related to the MIMO separation of the second control information.

Abstract: A method for monitoring a high-frequency transmit device of a magnetic resonance tomography system with a transmit antenna system having a plurality of transmit channels is provided. A reference transmit signal is output on different transmit channels of the transmit antenna system, respectively, at different time points, and a reference measurement signal induced by the reference transmit signal is measured on at least one of the other transmit channels using a measuring device assigned to the transmit channel. Based on the reference measurement signal, a phase deviation indicator value is determined. The phase deviation indicator value indicates a relative phase deviation between the measuring devices of the transmit channels in question.

Abstract: A method for monitoring voice quality in a communication network. In a first embodiment, the method comprises the steps of: establishing a voice communication pathway (VCPW) between first and second telephone terminals; establishing speech cadence between first and second terminals, wherein the terminals alternate between opposing send and listen/receive modes such that when one of the terminals is sending a voice test message the other terminal is either listening for or receiving the voice test message and vice versa; and calculating a voice quality score for one or more received voice test messages. In a second embodiment, synchronous cadence is established between a plurality of telephone terminals and a voice recognition server (VRS).

Abstract: A method and apparatus for measuring a complex gain of a transmit path are disclosed. During a test mode, an IQ to radio frequency modulator modulates a quadrature RF carrier signal using a quadrature test signal. An RF to IQ down-converter down-converts a down-converter RF input signal to provide a quadrature down-converter output signal using the quadrature RF carrier signal. The down-converter RF input signal is based on the quadrature test signal and the gain of the transmit path. A digital frequency converter frequency converts the quadrature down-converter output signal, providing an averaged frequency converter output signal, which is a quadrature direct current signal representative of an amplitude of the quadrature test signal and the gain of the transmit path. Therefore, a measured gain of the transmit path is based on the amplitude of the quadrature test signal and averaged frequency converter output signal.

Abstract: Methods and systems for level detector calibration are disclosed and may comprise calibrating a level detector integrated on-chip to eliminate an associated zero input offset voltage utilizing a replica bias circuit with no input ac voltage at the level detector or the replica bias circuit. The offset voltages of the level detector and the replica bias circuit may be combined to eliminate the associated zero input offset voltage of the level detector. The output signal may be generated by a difference of output signals from the level detector and the replica bias circuit. The level detector and the replica bias circuit may be biased utilizing a similar bias voltage. A plurality of known input voltages may be utilized to generate a corresponding plurality of output voltages of the level detector, generating a corrected transfer function that may be used to accurately set a transmitter power level.

Abstract: Provided are an RFID reader and a method for suppressing transmission leakage signals thereof. The RFID reader includes a first loop, a second loop, and a digital signal processor. The first loop suppresses a first transmission leakage signal of an RX signal in response to a first leakage control signal. The second loop suppresses a second transmission leakage signal of the RX signal, received through the first loop, in response to a second leakage control signal. The digital signal processor generates the first leakage control signal and the second leakage control signal. The digital signal processor generates the first leakage control signal until the level of the first transmission leakage signal becomes equal to or lower than the level of a first reference transmission leakage signal.

Abstract: The invention concerns a test method for a transmitter-receiver circuit. This transmitter-receiver circuit includes an antenna, connected to a processing unit, arranged for receiving signals and converting their frequency. The transmitter-receiver circuit also includes a power amplifier connected to said antenna and arranged for sending transmission signals.

Abstract: According to one exemplary embodiment, a method of preventing harmonics from causing distortion in a communications system includes feeding a test signal through a pre-distortion circuit in the communications system to a transmitter in the communications system. The method continues by transmitting a distorted output signal produced by the transmitter to an analyzer, analyzing the distorted output signal to identify one or more undesired harmonics, and generating and sending calibration data from the analyzer to calibrate the pre-distortion circuit, thereby preventing the one or more undesired harmonics from causing distortion in the communications system. In one embodiment, a system to prevent harmonics from causing distortion in a communications system includes a pre-distortion circuit, a transmitter, and an analyzer configured to identify one or more undesired harmonics and to generate and send calibration data to prevent the undesired harmonics from causing distortion.

Abstract: In one embodiment, the method includes receiving a pilot signal from a terminal at a target antenna of the plurality of antennas of the network element, determining an uplink channel estimate for the target antenna based on the received pilot signal, and obtaining a calibration coefficient associated with the target antenna. The calibration coefficient is based on a channel estimate between the target antenna and a different one of the plurality of antennas. The method further includes beamforming a transmission to the terminal using at least the target antenna based on the determined uplink channel estimate and the obtained calibration coefficient.

Abstract: The present invention relates to a method and system for a radio transmission emulator. In one embodiment, the present invention includes a radio transmission emulator system. The radio transmission emulator system includes a radio transmission emulator, an automobile, and/or a radio data analysis unit. The automobile can include a radio receiving unit. The radio transmission emulator generates a field simulation signal which simulates interferences. The field simulation signal is transmitted from the radio transmission emulator to the radio receiving unit. The radio receiving unit generates the radio data based on the field simulation signal. The radio data analysis unit analyzes the radio data to determine whether adjustments should be made to the radio receiving unit.

Abstract: A comparator circuit compares a test pattern generated by a test pattern generator circuit, with a test pattern transmitted to a memory card and returned from the memory card. A control circuit determines a bandwidth corresponding to frequency components correctly transmitted between a host apparatus and the memory card, based on the returned test pattern, and selects an encoding method requiring a maximum available bandwidth. The control circuit generates a notification message indicating the selected encoding method, and encodes the notification message using the selected encoding method, and transmit the encoded notification message to the memory card. The control circuit establishes communication between the host apparatus and the memory card, when receiving a response message including an acknowledgement to the notification message, from the memory card.

Abstract: An apparatus for determining a health of radio-frequency transmitters each transmitting a transmitted signal during normal operation. The apparatus comprises a receiver for receiving received signals, each received signal responsive to a transmitted signal, a first element for determining signal parameters of each received signal, the signal parameters responsive to an operating condition of a transmitter, each transmitted signal and each associated received signal including an identifier of the transmitter that transmitted the transmitted signal, the apparatus using the identifier to link determined signal parameters with the transmitter that transmitted the transmitted signal and a second element for determining a health of the transmitter that transmitted the transmitted signal, the health responsive to a relationship between one or more signal parameters and a selected value or a range of selected values for each signal parameter.

Abstract: a measurement method for minimization of drive test (MDT) comprises steps of: receiving measured frequency information for cell reselection and measured frequencies for MDT; measuring a quality of a serving cell; performing a first quality measurement on a neighboring cell; performing a second quality measurement on the neighboring cell; and storing results of the first and second quality measurements, wherein the step of performing the first quality measurement includes performing an intra-frequency measurement for the MDT on the neighbor cell when the frequency of the serving cell is included in the MDT frequencies, and performing the intra- frequency measurement for the neighbor cell only in the event where the quality of the serving cell in a first threshold value or less when the frequency of the serving cell is not included in the MDT frequencies, and the step of performing a second quality measurement includes performing an intra- frequency measurement for the MDT on the neighbor cell when an inter-fre

Abstract: A transmitter, a base station device, and a method for aligning a signal output from a transmitter are provided. The transmitter is connected to a first antenna, and the first antenna detects a second test signal transmitted by a second antenna that is connected to another transmitter. The transmitter includes: a signal generating unit, which generates a first test signal; a directional coupler, which receives the first test signal and the second test signal; and a signal processing unit, which measures a timing difference between the first test signal and the second test signal, and uses the measured timing difference to control signal generation, so as to align a signal transmission delay between the two transmitters. Thus, closed-loop detection and an adaptive rectification mechanism for transmission signals of multiple transmitters can be implemented, and accuracy of aligning a signal at each transmitting antenna is improved.

Abstract: An apparatus and method for testing communication capabilities of networks and devices are provided. According to one aspect, an interface device for providing communications between a first and a second device comprises an input, logic, and an output. The input of the interface device receives data in a first format from the first device. The logic identifies the second device for receiving the data and identifies a second format compatible with the second device. The data is then translated to the second format. The logic may also determine a status of the interface device by testing components of the interface device to determine if the components are accessible and functioning. The output of the interface device then transmits the translated data to the second device.

Abstract: A method of controlling the phases of RF output signals from a number of radio transmitters. A given radio has at least one synthesizer as a source of its RF output signal, and the synthesizer produces an output the phase offset of which relative to a reference signal is controlled by a phase offset command. A path from an antenna port of the radio obtains a fed back RF output signal and a phase difference between the reference signal and the fed back RF output signal is measured. A value of a zero degree phase offset command for the synthesizer is determined such that the phase difference between the reference signal and the fed back RF signal is nominally zero, and the value is stored. A phase offset command for providing a desired phase offset for the RF output signal is then determined based the stored value of the zero degree phase offset command.

Abstract: A method including providing a matching circuit, a first contact connected, without an intervening test connector to a transmitter and/or a receiver, and a second contact, separate from the first contact, connected to the matching circuit; sensing a parameter of the transmitter and/or the receiver by connecting test apparatus to the first contact; and providing an antenna element for coupling with the first contact and the second contact.

Abstract: Circuitry and method for reduce test time for wireless signal systems by using dynamic adaptive correction of DC offsets generated by the test instrument. The data signal is sampled for downstream processing including during pre-, inter-, or post-packet time intervals where no packet-data signal is occurring and where the device's power amplifier is turned off. The sampled data signal is measured for a DC offset occurring during these inter-packet time gaps. Compensating DC offset values are stored in a table indexed by frequency, gain and temperature range. When a subsequent test is carried out at that frequency, gain, and temperature range, the stored compensation value is used to correct the signal. DC offsets continue to be measured, stored and applied to captured signals, continuously refining the compensation values and decreasing the need for time-intensive calibrations. When a measured DC offset exceeds pre-determined limits, the instrument undergo a calibration step.

Abstract: A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to analyze RF signals. The signal analyzer may comprise at least one multiplexor for selecting selected RF signals for comparison and analysis, and may comprise a digital signal processor (DSP) for analyzing the selected RF signals and adjusting at least one operational parameter of the digitally controlled analog sub-system responsive to the analysis.

Abstract: The invention relates to a device and to a method for testing a mobile radio device in a multiple antenna system using a frequency-selective static channel model for channel simulation in frequency space. In the method according to the invention, the useful data to be transmitted are first allocated to a plurality of carrier frequencies and the associated coding parameters per antenna. The useful data are then modulated onto the carrier frequencies according to the allocation. One or more modulated carrier signals are now distorted in frequency space according to a frequency-selective static channel model. A transmission signal composed of the channel-modeled modulated carrier signals is subsequently transmitted in the period of time to a mobile radio device to be tested.

Abstract: In a radio device such as a receiver or transceiver, a test operation can be performed to determine performance. A received signal can be processed to obtain demodulated samples, which can be provided to a logic to perform a logic operation on the samples to generate a logic output. A storage such as a counter or other mechanism is coupled to the logic to store a count of a number of the logic outputs having an error.

Abstract: An IQ imbalance correction method includes transmitting a plurality of pairs of RF training signals in installments by pairing RF training signals symmetric with respect to a center frequency on a frequency axis; setting a reception local frequency to change to a frequency that is suitable to receive, via an internal path, each of the plurality of pairs of RF training signals transmitted in installments, and suitable to convert the each of the plurality of pairs of RF training signals into IF training signals; and performing quadrature demodulation on the IF training signals, respectively, in a digital circuit area to generate BB training signals.

Abstract: A transmitter, when the power changes at a certain timing, adjusts the gain for the transmission signal before the application of the distortion compensation process correspondingly to the amplitude of the transmission signal at the certain timing based on the average of the power of a transmission signal before application of the distortion compensation process, obtains a distortion compensation coefficient corresponding to the value of the power of the adjusted transmission signal from the LUT, applies the distortion compensation process to the transmission signal using the obtained distortion compensation coefficient, calculates an update for a distortion compensation coefficient corresponding to the obtained distortion compensation coefficient and stored in the LUT based on an error between the power of the transmission signal amplified by an amplifier and the power of the transmission signal before the application of the distortion compensation process, and updates the LUT using the calculated update.

Abstract: The invention relates to a method for testing a mobile radio device comprising at least one first antenna (9) and a second antenna (10), and to a mobile radio device (2) and test equipment (1). A signal generation unit (5) of the test equipment (1) generates a test signal (27). The test signal is transmitted to a mobile radio device (2) to be tested and is received by the mobile radio device (2) and evaluated. The mobile radio device (2) then generates a response signal (31) and a transmission schedule (30) for transmitting the response signal via the first antenna (9) and/or the second antenna (10) is defined. The response signal (33) is transmitted according to the transmission schedule and received by the test equipment (1). The transmission schedule used is determined by the test equipment. The transmission schedule (36) used is then determined.

Abstract: A method for generating interference signals and a device to carry out said method, in which an interference signal (1) is added in a signal combination and separation network (3) with a desired signal (4) that carries a test message, the sum signal being sent to a device being tested (5). The interference signal (1) is generated with a single source connected to a signal divider and conditioner block (7) that attenuates additional interference produced by the source of generation of interference signals (1), while providing as many interference signals (1) as the device (5) under test has antennas (Rx, Rx/Tx), and in which each interference signal (1) is sent to a respective amplification and isolation block (8), which adjusts the power level of the interference signal (1) and attenuates the reverse intermodulation products produced by the transmission of signals by the device (5) under test.

Abstract: A system and method for measuring transmission power distortion in a wireless communication device are disclosed. In one embodiment, the method comprises reading an operating temperature of the wireless communication device and enabling a loopback path between a transmission circuit and a receiver circuit of the wireless communication device. Using the loopback path, the wireless communication device can calibrate the transmission power output by storing data for compensating the distortion of the transmission power. The data can be stored in a calibration look up table for use by the wireless communication device.

Abstract: A performance indicator for uplink traffic is measured a plurality of times under a plurality of conditions to generate a set of uplink performance indicators. The performance indicator for downlink traffic is measured a plurality of times under the plurality of conditions to generate a set of downlink performance indicators. The performance indicator for bidirectional traffic is measured a plurality of times under the plurality of conditions to generate a set of bidirectional performance indicators. The plurality of conditions comprise: a set of center frequency parameters; a set of attenuation factor parameters for each one of the set of center frequency parameters; a set of channel model parameters for each one of the combinations of attenuation factor parameters and center frequency parameters; and, a set of modulation coding scheme parameters for each one of the combinations of channel model parameters, attenuation factor parameters, and center frequency parameters.

Abstract: A system includes a communication apparatus coupled to a test subsystem through a converter. The test subsystem may be configured to initiate an audio test of the communication apparatus and receive in response a set of audio test data at a predetermined constant data rate. The communication apparatus may be configured to enable output of audio test data during inactive periods of operation of an RF circuit of the communication apparatus and to disable output of audio test data during active periods of operation of the RF circuit. The converter may be configured to receive the set of audio test data from the communication apparatus and provide the set of audio test data to the test subsystem at the predetermined constant data rate during the active and the inactive periods of operation of the RF circuit.

Abstract: The transmitter synthesizes amplitude and phase components and calibrates a delay mismatch between amplitude and phase components with high accuracy at high speed. The transmitter has: a digital-to-analog converter (DAC) and a low-pass filter (LPF) in its amplitude-signal path; and a phase modulator operable to convert up a phase component into an RF component in its phase-signal path. In an operation of delay calibration, a test input signal is supplied to a delay-calibrating unit in the amplitude-signal path, and the delay-calibrating unit provides a test input signal to DAC. Then, LPF generates a test output signal. The delay-calibrating unit detects a delay of the test output signal relative to the test input signal, calibrates an amplitude signal delay in a range from the input of the delay-calibrating unit to the output of LPF, reduces the difference between amplitude and phase signal delays of the phase modulator in the phase-signal path.

Abstract: A pulse transmission technique is used for wireless communication between a microcomputer (13) having a debugging support circuit (17) and a debugger (13). The pulse transmission technique is based on magnetic field coupling between a first coil (14) provided for the microcomputer and a second coil (8) coupled with the debugger. During an initialization operation, the microcomputer performs a process of configuring a communication condition of the wireless communication to perform the wireless communication. The microcomputer awaits control from the debugger when the microcomputer establishes communication with the debugger. The debugger awaits establishment of the communication and proceeds to control of the microcomputer in accordance with the wireless communication. It is possible to provide contactless interface for system debugging without the need for a large antenna or a large-scale circuit for modulation and demodulation.

Abstract: The method relates to a method of characterizing a radio link. In the method, a radio frequency interrogator and a first radio frequency transponder, the response of which in an essentially anechoic chamber is known, are utilized. According to the invention, the response of the first radio frequency transponder is measured in a target environment in the chosen interrogator-transponder geometry and the responses of the radio frequency transponder in the target environment and in an essentially anechoic chamber are compared for characterizing the actual radio link. The invention provides information on multi-path propagation of radio waves characteristic to the target environment, which can be further taken into account in, for example, RFID system design.

Abstract: A system for calibrating a closed power control loop includes an adder configured to inject a test signal into an adjustable element, a first peak detector configured to determine an amplitude of the injected test signal, a second peak detector configured to determine an amplitude of a return test signal, a comparator configured to determine the difference between the injected test signal and the return test signal, and a calibration engine configured to adjust the adjustable element so that the return test signal is offset from the injected test signal by a predetermined amount.

Abstract: A method of measuring a state of a plurality of channels is provided. The method includes transmitting to a second device test signal information needed to transmit/receive a test signal for measuring the state of the plurality of channels; receiving an information received response from the second device, indicating that the second device has received the test signal; if the information received response is received, transmitting the test signal to the second device, using the test signal information, via the plurality of channels; and receiving from the second device the state information regarding the plurality of channels which has been measured by using the test signal.

Abstract: A method and system for wireless communication is provided and may include transmitting FM radio signals utilizing antenna configurations in a wireless device including a frequency modulation (FM) radio transmitter, an FM radio receiver, and one or more other receivers. The transmitter may be calibrated based on a signal received from a second wireless device via the other receivers. The second wireless device may include an FM radio receiver and corresponding other transmitters that may utilize other wireless protocols. The signal received at the wireless device may be generated at the second wireless device via the other transmitters. A frequency of the transmitted FM radio signals may be varied, and may be utilized adjust the antenna configurations. An impedance of the antenna configurations may be matched based on the frequency variation. A capacitive and/or inductive load for the matching of the impedance of the antenna configurations may be programmably adjusted.

Abstract: There is provided a method of method of estimating a quality of a signal, the method in a first device comprising measuring a signal transmitted from a second device to a third device; determining a value of a metric from an autocorrelation function of the measured signal; and determining an estimate of the quality of the signal from the determined metric.

Abstract: A method for compensating the axial ratio of an antenna for testing radio-frequency identification (RFID) tags and an apparatus using the method are provided. The method includes the following steps. An initial location of the RFID tag (or a tagged product) is set to obtain an initial vector. The RFID tag and the antenna are respectively rotated with a first axis and a second axis to detect characteristics of the RFID tag in all directions, and the first axis and the second axis are perpendicular. A polarization angle of the RFID tag is calculated according to the initial vector of the RFID tag and a location of the RFID tag after rotation. A compensation value is obtained through a look up table according to the polarization angle, so as to compensate for the axial ratio of the antenna.

Abstract: Generating a radio frequency test signal for a mobile wireless communication device from a set of scanned radio frequency data that represents a plurality of radio frequency channels over a sequence of time intervals. A segment of the set of scanned radio frequency data over a time interval is classified into one of several radio frequency environments. A subset of the segment of scanned radio frequency data is selected based on the classified radio frequency environment. A segment of the radio frequency test signal is generated using the selected subset of scanned radio frequency data. The steps of classifying, selecting and generating are repeated for each time interval in the sequence of time intervals. Classifying the segment of scanned radio frequency data into a radio frequency environment includes comparing a set of statistics extracted from the segment of scanned radio frequency data to pre-defined classification ranges.

Abstract: Methods and apparatus are disclosed for automatically adjusting antenna impedance match in a wireless transceiver employing phase-amplitude modulation. According to some embodiments of the invention, a wireless transceiver comprises a transmitter circuit and a receiver circuit connected to the antenna by a transmit/receive duplexer. An electronically adjustable matching network is located between the transmitter output and the antenna. To control the adjustable matching network, a directional coupler is located between the transmitter output and the matching network to separate transmit signals reflected from the antenna system, including the antenna, the matching network and the T/R duplexer. The reflected transmit signals are routed to the receiver circuit, which digitizes the reflected signal and determines an antenna reflection coefficient based on the digitized reflected signal and the modulation signal used to create the transmit signal.

Abstract: A test apparatus for conducting a radiated performance test on a wireless device under controlled test conditions, the test apparatus having an anechoic chamber; a test computer; and an interface, the interface adapted to connect the test computer to the wireless device, the test apparatus being adapted to: establish a data connection on the interface between the test computer and the wireless device; initialize and start a timer for a predetermined interval on the wireless device; subject the wireless device to the radiated performance test in the anechoic chamber after the predetermined interval; and analyze test results on the test computer from a test log stored on the wireless device during the radiated performance test, wherein the interface between the test computer and the wireless device is adapted to be removed during the predetermined interval; for conducting a radiated performance test on a wireless device.

Abstract: A relationship is established between measurable characteristics of the DC power input to a power amplifier and the RF output power level. A power circuit is configured to measure the input supply current to the power amplifier and to utilize the relationship between the input supply current and the applied input supply voltage to the output power level, thereby normalizing the output power of an amplified communication signal.

Abstract: Embodiments include systems and methods for testing a wireless device, especially one with multiple antennas. In one embodiment, a plurality of antennas are placed around a device under test in an anechoic chamber. Each of a plurality of the antennas is connected to a path of a variable path simulator capable of generating multiple paths between the antennas and external wireless communication test equipment. The variable path simulator introduces a delay spread into each path. In this way, a multipath environment is simulated with signals appearing to arrive from different angles and different distances.

Abstract: Predistortion may be employed to avoid distortion in the output of a power amplifier (PA) in a transmitter, while maintaining transmit power. An active transmission signal, instead of test tones, may be used for training a predistorter for the PA, and for the entire analog transmit path of the transmitter, via a loopback path from the output of the PA to the input of a receiver path. The transmitter may include an upconverter, and the receive path may include a downconverter, which may therefore both be included in the loopback path, helping eliminate phase noise. The predistortion training may incorporate fractional timing correction, to properly align the amplified version of the original TX signal received via the loopback path with the original TX signal. The transfer function of the PA may be estimated as a polynomial function, obtaining the coefficients of the polynomial function using adaptation techniques according to one of a number of possible different methods, e.g.

Abstract: A method is provided to transmit a signal by a transmitter in a communication system. The method includes predicting a receiver noise signal received from a receiver, and increasing an intelligibility of a transmitter signal using the receiver noise signal. The transmitter signal includes a transmitter noise signal and a transmitter speech signal. The transmitter cancels the transmitter noise signal from the transmitter signal and intensifies the transmitter speech signal in consideration of the receiver noise signal.

Abstract: A test unit for testing the frequency characteristics of one or more components of a transmitter of modulated signals. The test unit includes a data source for generating a test pattern of data. A test unit output is connected to the data source and connectable to an input of one or more of the components, for inputting the test pattern of data to the one or more components. The test unit includes a memory in which a first predetermined data sequence and a second predetermined data sequence are stored. The data source is connected with an data input to the memory, and the data source is arranged to generating the test pattern of data including the predetermined data sequences.

Abstract: In order to improve the reduction of interference among cells such as pico cells and ease operations of arranging and controlling the cells, a wireless communication area measuring apparatus includes: a signal measuring unit for calculating wireless environment indicators at measuring points based on measured data of received signal strength indicators of a plurality of base stations; a transmission power determination unit for adjusting transmission power of the base stations based on margins of the received signal strength indicators; and a display unit for outputting adjustment results of the transmission power of the base stations.

Abstract: Test system and method for analog-to-digital converter (ADC) based on a loopback architecture are provided to test an M-bit ADC. In the invention, an N-bit digital-to-analog converter (DAC) converts a digital input to a basic test signal, a segmentation circuit scales the basic test signal and superposes it with segmentation DC levels for providing corresponding segmented test signals, such that the ADC converts the segmented test signals to reflect result of testing. With the invention, practical loopback architecture of low-cost can be adopted for testing.