Abstract: A full duplex radio apparatus comprising: a transmit path configured to transmit a first signal; a receive path configured to receive a received signal; a near-receive path for observing a first period of the received signal; a far-receive path for observing a second period of the received signal, the far-receive path comprising a radio frequency limiter; a self-interference cancellation circuit coupled between the transmit path and the near receive path; a variable impedance component; and a directional coupler comprising a first port, a second port, a third port, and a fourth port, wherein: the first port is coupled to the receive path; the second port is coupled to the radio frequency limiter of the far-receive path; the third port is coupled to the self-interference cancellation circuit; and the fourth port is coupled to the variable impedance component.

Abstract: A system and method for detecting the presence of a Bluetooth or Zigbee signal within a short period of time is disclosed. The signal identification circuit has two stages, a first stage that processes windows to determine whether noise is present, and a second stage that processes long windows to determine whether the signal is a particular lower-power network protocol. The signal identification circuit can be configured to detect Bluetooth at 1 Mbps, Bluetooth at 2 Mbps or Zigbee. The signal identification signal may be used to allow a lower-power network controller to coexist with a high duty cycle WiFi controller. The signal identification circuit may also be used for other functions, such as powering on a lower-power network controller, determining CCA, or determining which channel a packet is being transmitted on.

Abstract: An electronic device is provided. The electronic device includes an antenna array configured to include a plurality of antenna modules, a communication circuit configured to include a plurality of power amplifiers connected with the plurality of antenna elements and a plurality of phase shifters, at least one processor operatively connected with the communication circuit, and a memory operatively connected with the at least one processor and includes instructions.

Abstract: A pixel cell, and a method of use thereof, the pixel cell including: an output, a photosensor configured to generate a first measuring current in a first measurement cycle and a second measuring current in a second measurement cycle as a function of radiation, an output node, a power storage device configured so that in a first operating mode a current can be injected by the power storage device as a function of the first measuring current, and so that in a second operating mode the power storage device is configured to hold the injected current so that the injected current can be detected at the output node, and a switching unit configured to form a difference between the injected current and the second measuring current at the output node in a reading cycle and to couple the output node to the output.

Abstract: An antenna matching system includes an electronically tunable antenna matching circuit, a first directional coupler, a first gain and phase detector, a second directional coupler, a second gain and phase detector, and a controller. The first directional coupler is configured to receive forward and reflected signals. The first gain and phase detector is configured to output a first magnitude measurement and a first phase measurement based on the signals received at the first directional coupler. The second directional coupler is also configured to receive the forward and reflected signals. The second gain and phase detector is configured to output a second magnitude measurement based on the signals received at the second directional coupler. The controller is configured to: determine circuit parameters based on the first magnitude and phase measurements; tune the matching circuit based on the circuit parameters; and check for phase error based on the second magnitude measurement.

Abstract: A transmission method using a massive MIMO (Multiple-Input and Multiple-Output) scheme with an arrangement 108 of Nm×Nb antenna elements at the transmitter, arranged in Nm sets of Nb antenna elements or Nb sets of Nm antenna elements based on SC-FDE (Single-Carrier with Frequency Domain Equalization) schemes with large constellations that is compatible with low-cost, highly-efficient, nonlinear amplifiers 106, while allowing spatial multiplexing gains. The transmission structure of this transmission method decomposes in 103 the modulated symbols from 102 associated to a given constellation as the sum of Nm polar components that are modulated as Nm BPSK (Binary Phase Shift Keying) signals. Each of these BPSK signals can be regarded as an OQPSK (Offset Quadrature Phase Shift Keying) signal in the serial format that is specially designed to have good tradeoffs between reduced envelope fluctuations and a compact spectrum.

Abstract: A method for synchronizing an MDPS motor and a motor position sensor may include: sequentially aligning, by a controller, a rotor of the MDPS motor by sequentially applying preset three-phase current pulses to the MDPS motor, the three-phase current pulses corresponding to one electrical-angle cycle of the rotor of the MDPS motor, and detecting an actual rotational position of the aligned rotor through the motor position sensor; determining a zero point rotational position of the rotor based on the actual rotational position; determining a reference rotational position of the rotor based on the actual rotational position and the number of pole pairs in the MDPS motor, and determining an offset rotational position of the rotor based on the actual rotational position and the reference rotational position; and correcting the zero point rotational position by adding the offset rotational position to the zero point rotational position.

Abstract: Control systems and methods for power amplifiers operating in envelope tracking mode are presented. A set of corresponding functions and modules are described and various possible system configurations using such functions and modules are presented.

Abstract: One of the embodiments of the present disclosure relates to a method for adjusting peak power capability of a power amplifier circuitry. The power amplifier circuitry comprises at least one main amplifier path and at least one peak amplifier path and is configured to output a signal combining amplified signals from the at least one main amplifier path and the at least one peak amplifier path. The method comprises calculating a PAPR of an input signal of the power amplifier circuitry; determining at least one configuration parameter of the at least one peak amplifier path depending upon the calculated PAPR of the input signal; and configuring the at least one peak amplifier path based on the determined at least one configuration parameter, thereby adjusting the peak power capability of the power amplifier circuitry. The present disclosure also relates to corresponding apparatus and wireless communication devices.

Abstract: A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter of a wireless communication unit is described. The method comprising, within at least one signal processing module of the wireless communication unit, applying a training signal comprising an envelope that varies with time to an input of the RF transmitter, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a power amplifier module gain, for example that is monotonically increasing as a function of power amplifier output power.

Abstract: A calibration device includes a continuous wave signal generator that generates a continuous wave signal having a predetermined amplitude, a quadrature modulator that amplifies the continuous wave signal using a variable gain and performs quadrature modulation of the amplified continuous wave signal to generate a radio frequency signal, an envelope detector that detects an envelope of the radio frequency signal, a gain adjuster that adjusts the variable gain, based on power of the detected envelope, a correction value searcher that searches for a correction value that provides a minimum value of a fluctuation amount of an amplitude of the envelope, and a corrector that adds the correction value obtained through the search by the correction value searcher to the continuous wave signal and outputs the continuous wave signal after the addition to the quadrature modulator.

Abstract: A modulator and associated method includes a calculation block configured to receive a plurality of digital samples of a modulated baseband signal, and determine time instances associated with predetermined phase crossings of the modulated baseband signal. The modulator further includes a converter circuit configured to generate a data dependent clock signal having rising and falling edges associated with the determined time instances, and a digital to analog converter configured to receive the data dependent clock signal and generate a square wave output signal having transition times associated with the generated data dependent clock signal.

Abstract: Two input signals are amplified and combined into an output signal by first and second amplification stages and a combiner element. The first amplification stage includes a first signal modification unit and a first amplifier which receives a first input signal and provides a first intermediate signal. The second amplification stage includes at least a second amplifier which receives a second input signal and provides a second intermediate signal. The combiner element combines the first and the second intermediate signals and produces the output signal. In addition, a sensor senses a reflected signal on a signal line connecting the first amplifier and the combiner element and a feedback loop extends between the sensor and the signal modification unit. The signal modification unit is adapted to modify the first input signal depending on a measurement signal output by the first sensor.

Abstract: Single-bit transmitter modulator having a digital pulse shaping filter configured to shape data pulses of an inphase signal and quadrature signal; an upsampling filter configured to increase the sample rate of the inphase signal and quadrature signal; a sigma-delta modulator providing a one-bit inphase output signal and a one-bit quadrature output signal; an inphase low-order analog low pass filter coupling the one-bit inphase output signal to an inphase channel input of a quadrature modulator, and a quadrature low-order analog low pass filter coupling the one-bit quadrature output signal to a quadrature channel input of a quadrature modulator; and, wherein the quadrature modulator is connected to a carrier signal generator and is configured to generate an inphase and quadrature modulated carrier.

Abstract: Embodiments of the present disclosure provide system and method for generating a transmission signal. A transmitter generates and transmits a transmission signal based on signal components. Circuitry that is coupled to the transmitter receives complex plane components of a signal to be transmitted and alters the signal such that a complex plane trajectory of the signal passes nearer to an origin of a complex plane of the complex plane trajectory than does an original complex plane trajectory of the signal. The circuitry determines the signal components to be transmitted by the transmitter based on the altered signal.

Abstract: A system for modulating a communications signal using a switchable antenna. By using a polarization switchable antenna, modulation of a signal and/or carrier can be achieved by switching the polarization of antenna. Since the change of polarization is achieved by separate circuitry, the signal or message can be modulated by other methods and be modulated again by antenna.

Abstract: A method for tuning a digital compensation filter within a transmitter includes: obtaining at least one resistance-capacitance (RC) detection result, wherein the digital compensation filter includes an RC compensation module; and tuning the digital compensation filter by inputting the RC detection result into the RC compensation module. For example, the RC detection result may correspond to a detected value representing a product of a resistance value and a capacitance value. In another example, the at least one RC detection result may be obtained by performing RC detection on at least a portion of the transmitter without individually measuring resistance values of resistors therein and capacitance values of capacitors therein. An associated digital compensation filter and an associated calibration circuit are also provided.

Abstract: A simulated radio channel is shifted with respect to a plurality of antenna elements coupled with an emulator for communicating with a device under test by using different directions for the simulated radio channel in an anechoic chamber.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Abstract: There is provided a method, an apparatus and a computer program product, which introduces a phase shift between radiation phase patterns of associated antennas which are applicable in transmitting and/or receiving radio frequency signals simultaneously via an air interface, wherein the phase shift is introduced in order to obtain orthogonality between the associated radio frequency signals.

Abstract: Methods and systems for transmitting and receiving data using audio devices but without being detectable by a human ear are disclosed. For example, a device for transmitting data can include a modulator configured to transform digital data into a modulated signal having a frequency no less than about 20 kHz, and an audio transmitter coupled to an output of the modulator configured to transmit the modulated signal into a sound propagating medium without being detected by a human ear. The methods and systems can be used to perform two-factor authentication for permitting a user to access a remote server or other device.

Abstract: A phase correction apparatus in a wireless transmitter includes a modulator configured to modulate an in-phase component and a quadrature component of a first signal by a first carrier wave signal, a demodulator configured to demodulate a returned signal by a second carrier wave signal and generate a second signal that includes an in-phase component and a quadrature component, a phase detector configured to binarize the in-phase components and the quadrature components of the first and second signals according to signal levels, and detect a phase error between the first signal and the second signal based on combinations of the binarized signal components in the first signal and the second signal, and a phase shifter configured to phase-shift the first signal, the second signal, the first carrier wave signal, or the second carrier wave signal, based on the phase error.

Abstract: A method is disclosed to generate inverse circular waves in opposite circular polarities. A method is disclosed to receive circular polarity signals in the presence of inverse interfering linear signals.

Abstract: Methods and systems for an n-phase transmitter utilizing a leaky wave antenna (LWA) are disclosed and may include transmitting an n-phase wireless signal at a first frequency via the LWA utilizing a plurality of second frequency signals from one or more signal sources, and the second frequency may be lower than the first frequency. Each of the second frequency signals may be configured with a phase difference and may be communicated to the LWA utilizing one or more power amplifiers (PAs). The PAs may be operated in switching mode, thereby generating a square wave. The LWAs may be integrated on the chip, on a package to which the chip is affixed, and/or on a printed circuit board to which the chip is affixed. Square wave signals may be generated utilizing the signal sources. The transmitted wireless signal may be amplitude modulated utilizing a bias voltage applied to the LWAs.

Abstract: A method and apparatus employing statistical physics energy minimization methods to signal constellation design. By using statistical physics concepts, an energy-efficient signal constellation design algorithm (EE-SCDA) is described. In the presence of amplified spontaneous emission (ASE) noise and channel impairments, we use EE-SCDA to determine a source distribution, and represent the signal constellation design as a center of mass problem. Furthermore a discrete-time implementation of D-dimensional transceiver as well as corresponding EE polarization-division multiplexed (PDM) system is described.

Abstract: A signal separating unit separates an input signal into a first branch signal and a second branch signal in such a manner that, as the amplitude of the input signal decreases, the amplitude of the first branch signal and the second branch signal decreases and the difference between a phase of the first branch signal and a phase of the second branch signal increases and, as the amplitude of the input signal increases, the amplitude of the first branch signal and the second branch signal increases and the difference between the phase of the first branch signal and the phase of the second branch signal decreases. An amplifier amplifies the first branch signal. Another amplifier amplifies the second branch signal. A combining unit combines signals that are output from the amplifiers together, thereby generating an output signal.

Abstract: An apparatus is disclosed having a receiver configured to communicate, by a first apparatus, with a second apparatus in a first mode; determine side information by the first apparatus based on the communication during the first mode; and store the side information by the first apparatus for communication in a second mode with the second apparatus, wherein the first and second modes of communication have different date rates. A method for wireless communications is also disclosed.

Abstract: Systems and techniques are described for applying a polar bias modulation having a phase component and an amplitude component to a signal amplified by a power amplifier. The power amplifier (PA) has a plurality of amplifier gain stages and is configured to amplify an input to create an amplifier output signal. The input to the power amplitude is phase modulated based upon the phase component of the polar bias modulation, but need not be amplitude modulated. Amplitude modulation is provided by logic that includes a detector configured to receive an indication of the amplifier output as a feedback signal, a control module configured to generate a control signal based upon both the feedback signal and the amplitude component of the polar bias modulation, and a bias circuit configured to adjust a bias signal associated with at least one of the plurality of amplifier gain stages in response to the control signal.

Abstract: A feedback loop is used to determine phase distortion created in a signal by directly extracting the phase distortion information from a feedback signal using original frequency modulation information.

Abstract: Disclosed is a configuration of a guard band for a radio communication system formed of consecutive sub-bands. Particularly disclosed are designs of a middle guard band for preventing interference between adjacent sub-bands and regulating a difference in frequency between signals transmitted in each sub-band in a radio communication system such as a multi-carrier OFDM system and a multi-carrier CDMA system that forms a wideband through carrier aggregation. Related transmission/reception method and apparatus are further disclosed.

Abstract: According to one exemplary embodiment, a method for producing an up-converted and amplified transmission signal comprises performing a logarithmic transformation of an input transmission signal to form a logarithmically transformed transmission signal, adding the logarithmically transformed transmission signal to a logarithmic local oscillator signal to form a sum signal, and performing an antilogarithmic transformation of the sum signal to produce the up-converted and amplified transmission signal. In one embodiment, a log-antilog circuit for producing an up-converted and an amplified transmission signal comprises a transmission log block configured to receive an input transmission signal and to provide a logarithmically transformed transmission signal as a transmission log block output, and an antilog block coupled to the transmission log block. The antilog block is configured to receive a sum signal of the transmission log block output and a logarithmic local oscillator signal.

Abstract: The present disclosure relates to multi-mode RF circuitry using a single IQ modulator topology that may support different communication standards, including enhanced data rates for global system for mobile communications evolution (EDGE) and EDGE evolution by dividing certain modulation functions between a frequency synthesizer and an IQ modulator. Specifically, during a standard modulation mode, which may be used to support many communications standards, the frequency synthesizer provides an un-modulated RF carrier signal to the IQ modulator, which either phase modulates or phase and amplitude modulates the un-modulated RF carrier signal to provide a standard modulated RF signal.

Abstract: Implementations of a high gain range transmitter with variable-size mixers are described.

Abstract: A power amplifying apparatus has a bandwidth limitation process circuit to which an envelope signal included in a transmission signal is inputted, and which performs a bandwidth limitation process on the envelope signal, a variable power supply circuit for generating a power amplifier supply voltage based on a voltage control signal generated by the bandwidth limitation process circuit, and a power amplifier which is fed an input signal, and which is driven in accordance with the supply voltage from the variable power supply circuit.

Abstract: A multi-mode communications transmitter includes a signal decomposer that converts rectangular-coordinate in-channel and quadrature channel signals into polar-coordinate amplitude and angle component signals and form therefrom first and second modulation signals. The signal decomposition process performed by the signal decomposer combines envelope-reduction and restoration (ERR) with filtering to reduce the bandwidths of the first and second modulation signals compared to the bandwidths of the unmodified amplitude and angle component signals. The reduction in signal bandwidths eases the design requirements of the electrical components needed to process and generate the signals applied to the power supply and radio frequency (RF) input ports of the multi-mode communications transmitter's power amplifier (PA).

Abstract: System for generating a pulsed signal of the ultra wideband type, comprising a device for direct digital frequency synthesis (DDS) comprising a phase accumulator (ACCP) able to deliver at a first frequency (Fclk) phases coded on i bits and spaced apart by a phase increment (?p) differing by a power of two and situated in the vicinity of 2i-1, processing means (MT) able to receive said phases and arranged so as to deliver an amplitude-modulated output signal (SG) whose envelope exhibits a succession of regions respectively delimited by zones of zero amplitude (ZA, ZB), each amplitude-modulated signal part situated in one of said regions forming a pulse of the ultra wideband type (IMP) whose central frequency is equal to said first frequency and whose width depends on the value of the phase increment, and control means (MC) able to regulate the operation of the digital synthesis device so as to selectively deliver one or more pulses of the ultra wideband type.

Abstract: A method, system, apparatus and article are described for optimizing transformer power combiners and for dynamically controlling power for outphasing power amplifiers. In some embodiments, for example, an apparatus may comprise one or more outphasing power amplifiers, one or more phase modulator modules coupled to and operative to dynamically control the one or more outphasing power amplifiers, and one or more power combiners coupled to and operative to combine outputs from the one or more outphasing power amplifiers, wherein the one or more power combiners comprise transformer power combiners arranged to combine outphasing signals using a primary inductor and differential signals using a secondary inductor. Other embodiments are described and claimed.

Abstract: To provide a power amplifier circuit which is capable of reducing a phase error of an output signal in a case where an amplitude of an input signal is relatively small, as well as a transmitter and a wireless communication device using the same. A constant envelope signal generation circuit (20) converts an input signal (Si) having envelope variation into a first constant envelope signal (Sd1) and a second constant envelope signal (Sd2) having the same amplitude and different phases, and outputs the signals. A first amplifier (11) amplifies the first constant envelope signal (Sd1). A second amplifier (12) amplifies the second constant envelope signal (Sd2). An output adder (13) outputs an amplified output signal having envelope variation based on the amplified signals output from the first amplifier (11) and the second amplifier (12).

Abstract: Determining a frequency offset of a received signal utilizing two or more multipath components of the received signal is provided herein. By way of example, the received signal can be correlated with a synchronization sequence in a time domain or a frequency domain, resulting in separation of the two or more multipath components of the received signal. Analysis of at least one of the multipath components can provide a frequency offset of the received signal. Furthermore, by analyzing the multipath components, estimation of the frequency offset can be improved as compared with single-signal analysis techniques.

Abstract: To provide a power amplifier circuit, which is capable of amplifying a signal having envelope variation with high power added efficiency, and exhibits low power consumption and high versatility, as well as to provide a transmitter and a wireless communication device using the power amplifier circuit, the power amplifier circuit includes: a constant envelope signal generation circuit (20) for converting an input signal (Si) having envelope variation into two constant envelope signals (Sd1, Sd2); a first and a second amplifiers (11, 12) for amplifying the two constant envelope signals to output two amplified signals (Sh1, Sh2); and an output adder (13) for performing vector addition of the two amplified signals.

Abstract: A signal generating section 10 outputs an amplitude signal and a frequency signal by conducting a signal processing on inputted data. A regulator 31 outputs a signal that is proportional to a magnitude of the amplitude signal. The signal outputted from the regulator 31 passes through a low pass filter 41, and is inputted into a power amplifier 51. The power amplifier 51 conducts an amplitude modulation on a frequency signal on which an angle modulation is conducted by an angle modulation section 20, using a signal outputted from the low pass filter 41. A controlling section 60 controls an amount of attenuation of a radio frequency component at the low pass filter 41 based on information such as: a modulation method of the inputted data; a modulation condition of the inputted data; a reception band; an output power of a modulation signal; and a frequency of the modulation signal.

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: When the change speed is instructed, without changing value of a suppressing vibration flag set to value 1 as initial value, a fast fill as the preparation of a brake to be engaged when the change speed is executed and low pressure standby of hydraulic pressure to set the brake in a half-engaged state. Then the suppressing vibration flag is set to value 0 when a predetermined time passed since the change speed is instructed, a sum of a drive torque required for driving and a suppressing vibration torque, which is in the same direction as suppressing rotational fluctuation of a drive shaft, is output from a motor when the suppressing vibration flag is set to value 1.

Abstract: A mobile terminal and method of controlling a driving voltage of a power amplifier therein are provided. The present invention includes a power amplifier module having a plurality of operative modes, the power amplifier module configured to amplify a power strength of an RF signal, a modem configured to deliver the RF signal to the power amplifier module, and to control the operative modes of the power amplifier module, a power detecting unit configured to output a reference voltage by detecting the power strength of the RF signal outputted from the power amplifier module, and a DC/DC converter configured to supply a driving voltage to the power amplifier module by adjusting a detected power value according to a gain corresponding to each of the operative modes of the power amplifier module.

Abstract: Methods and systems for an n-phase transmitter utilizing a leaky wave antenna (LWA) are disclosed and may include transmitting an n-phase wireless signal at a first frequency via the LWA utilizing a plurality of second frequency signals from one or more signal sources, and the second frequency may be lower than the first frequency. Each of the second frequency signals may be configured with a phase difference and may be communicated to the LWA utilizing one or more power amplifiers (PAs). The PAs may be operated in switching mode, thereby generating a square wave. The LWAs may be integrated on the chip, on a package to which the chip is affixed, and/or on a printed circuit board to which the chip is affixed. Square wave signals may be generated utilizing the signal sources. The transmitted wireless signal may be amplitude modulated utilizing a bias voltage applied to the LWAs.

Abstract: A transmitter circuit is provided which is capable of reducing modulation distortion even when an output power of a power amplifying section 141 is low. A signal generation section 11 generates an amplitude signal and a phase signal. A regulator 12 outputs a current based on the amplitude signal. A phase modulation section 13 phase-modulates the phase signal, and outputs a phase-modulated signal. The power amplifying section 141 receives the current which is based on the amplitude signal and supplied as a bias current from the regulator 12, and amplifies the phase-modulated signal by using the supplied current. Further, to the power amplifying section 141, a predetermined DC voltage is supplied as a collector voltage.

Abstract: The present invention is a high power direct transmitter with frequency-shift keying (FSK) modulation. The transmitter implements a high power, high efficiency power voltage-controlled oscillator (VCO) which allows for production of a modulated RF signal at the final stage (ex.—right at the antenna), thereby eliminating all driving stage power amplification and frequency translation. The transmitter further provides a low SWAP-C alternative to currently available solutions.

Abstract: A radio communication method includes generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted. Each of the first and second transmit RF signals have a power spectrum in symmetric shape in the frequency domain. The first transmit RF signal and the second transmit RF signal are transmitted at a different time. The first transmit RF signal and the second transmit RF signal are received to generate a first received RF signal and a second received RF signal. The data signal from the first received RF signal and the second received RF signal are reproduced.

Abstract: An internal operation of RF IC is adjusted so that the level of an RF transmitter signal is substantially stopped from rising, or made to descend in course of ramp-up of the RF transmitter signal. This adjustment is enabled by ramp-up adjustment data Last 4 symbols contained in preamble data precedent to real transmission data transmitted after completion of ramp-up. The ramp-up adjustment data and real transmission data are supplied from a baseband LSI. The RF transmitter signal contains phase and amplitude modulation components according to the EDGE system. RF IC includes phase and amplitude modulation control loops PM LP and AM LP. Ramp-up of RF power amplifiers PA1 and PA2 is performed by controlling the gain of the first variable amplifier MVGA included in the AM LP according to ramp information. Thus, unwanted radiation's level is reduced during ramp-up of the RF transmitter signal of the RF power amplifiers.

Abstract: An object of the invention is to provide a multimode polar modulation device and a multimode radio communication method for making it possible to decrease the distortion compensation processing data capacity while maintaining the distortion compensation accuracy and also making it possible to efficiently store the distortion compensation processing data corresponding to a multimode modulation signal adaptively acquired in memory. At the distortion compensation coefficient calibration operation time of a polar modulation circuit 1901, a control section 1903 selects a modulation signal with a narrower dynamic range of amplitude signal than at the transmission operation time, an adaptive operation control section 1711 measures a spectrum in output of a power amplifier 1 for each predetermined output level, and a distortion compensation processing circuit 1701 finds optimum coefficient information.