Abstract: Methods and systems for calibrating a transmitter with I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting a DC offset. The adjusting optionally includes an iterative refinement process.

Abstract: A method for compensating a transceiver for impairments includes transmitting a plurality of partial bandwidth training signals using a transmitter. A plurality of response signals of a receiver having a bandwidth and exhibiting receiver impairments is captured. Each response signal is associated with one of the partial bandwidth training signals. Each of the partial bandwidth training signals is associated with a portion of the receiver bandwidth. A plurality of partial compensation filters is generated based on the plurality of response signals. Each partial compensation filter is associated with one of the response signals. The partial compensation filters are combined to configure a receiver compensation filter operable to compensate for the receiver impairments.

Abstract: An electrical circuit comprises a source of an interferer signal; at least one component configured for using the signal; at least two electrically parallel conductive paths by which the signal can pass between the source and each of the at least one components; and a signal path selector configured to selectively enable the signal to pass from the source to the component by any of the at least two conductive paths and to, when one of the paths is enabled to carry the signal, disable each of the other at least two paths from carrying the signal.

Abstract: A power tuning method determines values of a magnitude control signal that controls the magnitude of an amplitude-modulated power supply signal applied to a power supply port of a power amplifier of a polar transmitter and an amplitude control signal that controls the amplitude of a constant-envelope phase-modulated signal applied to a radio frequency input port of the power amplifier necessary to set the output power of the polar transmitter to a target output power. The method is repeated and performed for a plurality of different target output powers. Output-power-level dependent power control parameters calculated from the applied method are used to set the values of the magnitude control and amplitude control signals during normal operation.

Abstract: A communication module is provided. The module includes at least one transceiver, a filter, a power amplifier, an enclosure, an internal interface and an external interface. The power amplifier is in communication with the at least one transceiver and filter. Moreover, the at least one transceiver, filter and power amplifier are tuned and calibrated to work with each other. The enclosure is configured to physically retain the at least one transceiver, filter and power amplifier. The internal interface is configured to interface connections between the at least one transceiver and the power amplifier and the external interface configured to provided external connections to the module. In addition, the external interface is coupled to the internal interface.

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: The present invention relates to an apparatus and a method for measuring an in phase and quadrature (IQ) imbalance. One embodiment according to the present general inventive concept can provide a method for measuring a Tx IQ imbalance generated in an IQ up-conversion mixer and an Rx IQ imbalance generated in an IQ down-conversion mixer, that includes measuring a first IQ imbalance corresponding to a first combination of the Rx IQ imbalance with the Tx IQ imbalance, measuring a second IQ imbalance corresponding to a second combination of the Rx IQ imbalance with the Tx IQ imbalance and obtaining the Tx IQ imbalance and the Rx IQ imbalance from the first IQ imbalance and the second IQ imbalance.

Abstract: One aspect of the invention includes a communication system that includes a tone generator configured to generate a first tone, a second tone, and a third tone. The third tone can have a frequency that is a harmonic product of at least one of the frequencies of the first and second tones. A transmitter that includes a predistortion system transmits a test signal comprising the first, second, and third tones. A receiver that is communicatively coupled to the transmitter receives and processes a received test signal corresponding to the test signal. The system further includes a controller that generates a set of correction coefficients based on a measured interaction of the third tone with a non-linear signal component in the received test signal. The set of correction coefficients can be provided to the predistortion system for substantially linearizing communication signals transmitted from the transmitter.

Abstract: Embodiments of the present invention relate to methods and systems of transmitting data signals from at least one transmitting terminal with a spatial diversity capability to at least two receiving user terminals, each provided with spatial diversity receiving device. The methods and systems are useful, for example, in communication between terminals, e.g., wireless communication. In certain embodiments, transmission can be between a base station and two or more user terminals, wherein the base station and user terminals are each equipped with more than one antenna.

Abstract: In an embodiment, a radio transmitter may be provided. The radio transmitter may include a radio transmitter control loop; and a controller configured in such a way that it operates the radio transmitter control loop as a closed control loop in a first operating mode, and that it operates the radio transmitter control loop as an open control loop in a second operating mode.

Abstract: A reverse link load control strategy utilizes a total call load metric in place of a reverse signal strength indicator metric for managing reverse link resources. In a disclosed example, a load control module (40) measures the reverse signal strength indicator (62) and measures an active cell load (64) using known techniques. A relationship between the reverse signal strength indicator, the active cell load, an other cell load component and a jammer component provides the ability to determine the other cell load component and the jammer component. Once the other cell load component has been determined, a total call load based upon the active cell load component and the other cell load component provides a useful metric for allocating reverse link resources between existing users and for determining whether to allow a new user, for example.

Abstract: Calibrating signal processing paths for a plurality of transmission devices by obtaining calibration data for at least one of the signal processing paths for each of the transmission devices and determining a plurality of calibration weights from the calibration data for each of the transmission devices. A calibration variance is calculated between the plurality of calibration weights and it is determined if the calibration variance is below a calibration variance threshold. Additionally, a phase variation and a magnitude variation are calculated from the calibration data for each of the transmission devices with respect to a reference transmission signal obtained from a reference transmission device and it is determined for each of the transmission devices if the phase variation is below a phase variation threshold and if the magnitude variation is below a magnitude variation threshold.

Abstract: A method and apparatus for testing a polar transmitter uses at least one square wave waveform as test stimuli replacing a multitone waveform. Each square wave signal is coupled one at a time to a frequency modulating input of the polar transmitter. The output of the polar transmitter is analyzed by observing the amplitude and frequency of the demodulated components corresponding to each square wave signal.

Abstract: Handling of integrity check failure in a wireless communication system can safely send the mobile station to the idle mode upon detection of security failure. Alternatively or in addition, attempts to recover from the security failure situation can be enabled without forcing the mobile station to enter idle mode. The mobile station autonomously transitions to idle mode when the integrity check failure is detected a certain threshold number ‘X’ times during a specified period ‘Y’. Whereupon, the mobile station initiates the Radio Resource Control (RRC) connection re-establishment procedure after integrity check failure is detected. In the RRC connection re-establishment procedure, the security parameters are re-initialized to provide a possibility to recover from the failure situation.

Abstract: A wireless transmitter of the present invention includes n (n being an integer of 2 or more) transmission antennas, a transmission circuit controller that, based on reception qualities reported from terminals, assigns a chunk to each terminal, and sends a phase-control report signal that determines whether to perform phase-control, to that chunk, and a transmission circuit unit that, to each of the n transmission antennas, performs phase-control based on the phase-control report signal, and applies a delay that obtains an optimum transmission diversity effect among a plurality of transmission diversity effects.

Abstract: A portable communication terminal device includes a section for detecting a call from a calling party; a section for obtaining position data for a present position of the portable communication terminal device; a section for storing data of a plurality of areas and a plurality of messages to the calling party, which respectively correspond to the areas; and a section for performing a determination when the call is detected. In the determination, it is determined whether the present position based on the position data belongs to one of the plurality of the areas stored in advance. The terminal also includes a section for performing message transmission when it is determined that the present position belongs to one of the plurality of the areas. In the message transmission, one of the plurality of the messages is transmitted, which corresponds to the one of the plurality of the areas.

Abstract: I/Q gain and phase mismatches of both transmit and receive paths of an OFDM FDD transceiver are simultaneously estimated. An up-converted RF signal is generated when the transmit path performs IQ modulation on a reference signal having a single sideband tone. The up-converted RF signal is sent via a loop-back path to the receive path. A down-converted evaluation signal is generated when the receive path performs IQ demodulation on the up-converted RF signal. The single evaluation signal is used to determine the transmit path gain and phase mismatches and the receive path gain and phase mismatches. The four I/Q mismatches are estimated without using significant hardware nut otherwise used in the regular transmission of data signals. The I/Q mismatches in data signals are corrected by pre-processing the up-converted RF signals and post-processing the down-converted RF signals by adding attenuated components of the in-phase and quadrature-phase signals to each other.

Abstract: Phase and gain of a transmit signal are measured at a transmitter by determining a first time delay having a first resolution at a measurement receiver between a reference signal from which the transmit signal is generated and a measured signal derived from the transmit signal by comparing amplitudes of the reference signal and the measured signal. A second time delay having a second resolution finer than the first resolution is determined at the measurement receiver between the reference signal and the measured signal based on the first time delay. The reference signal and the measured signal are time aligned at the measurement receiver based on the second time delay and the phase and gain of the transmit signal are estimated after the reference signal and the measured signal are time aligned.

Abstract: A test equipment for testing a wireless communication device includes a wireless transceiver, memory, and a controller. The wireless transceiver transmits a first and second series of packets. The wireless transceiver receives a power level indicator that is based on at least one of the first series of packets. The memory stores the power level indicator. The controller performs a signal strength test. More specifically, the controller controls the transceiver to transmit the first series of packets at a first power level. The controller stores the power level indicator in memory when the power level indicator is received by the transceiver. The controller controls the transceiver to transmit the second series of packets at a second power level.

Abstract: Techniques for self-calibration of transceivers are described herein.

Abstract: One embodiment relates to a radio frequency (RF) communication device. The RF communication device includes an antenna interface coupled to an antenna that exhibits a time-varying impedance. The RF communication device also includes a test interface coupled to RF test equipment that exhibits a test impedance. A tuning circuit in the RF communications device selectively provides a matched impedance to either the time-varying impedance or the test impedance based on feedback derived from the test interface. Other methods and systems are also disclosed.

Abstract: A communication device that includes a femtocell base station and a mobile station transmitter/receiver. The femtocell base station may provide bidirectional internet protocol (IP) communication for one or mobile devices to a cellular network. The femtocell base station may be operable to communicate with the cellular network using a wide area network. The mobile station transmitter/receiver may be coupled to the femtocell base station (in a same housing). The mobile station transmitter/receiver may be operable to perform radio frequency (RF) wireless communication with the cellular network, e.g., to detect and/or report environmental parameters, performing testing (e.g., loopback testing), and/or provide communication for the one or more mobile devices (e.g., when the wide area network is down), among others.

Abstract: A multiple input multiple output (MIMO) antenna module, comprising a first signal feed port coupled to a first antenna element disposed along a first edge of an antenna array board, a second signal feed port coupled to a second antenna element disposed on the antenna array board and a transceiver operable to be selectively coupled to either or both of the first and second signal feed ports.

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 system and method of testing call performance of a plurality of mobile telephones is provided. In one embodiment the method comprises storing in a memory of a test device, data for one or more test scenarios that each comprises associated test parameters for attempting a plurality of telephone calls, establishing a first Bluetooth connection between the test device and a first mobile telephone, and concurrently with said first Bluetooth connection, establishing a second Bluetooth connection between the test device and a second mobile telephone. The method further comprises transmitting commands to the first and second mobile telephones via the Bluetooth connections to cause the mobile telephones to attempt to establish a plurality of telephone calls of the test scenarios, and monitoring the plurality of telephone calls of the mobile telephones to determine test results data.

Abstract: For simpler and more rapid testing of a front-end module, additional linked operating states are provided in the switch and/or its decoder and allow a plurality of paths to be enabled in parallel, in order in this way to test these paths with a smaller number of test routines in a test set, in particular a network analyzer.

Abstract: A circuit for calibrating the DC offset in a wireless communication device utilizes a voltage-generating circuit to generate a first voltage value and its negative value, and utilizes a detecting circuit to detect an output of the wireless communication device and generate a first target-branch reference value corresponding to the power of the output when the first voltage value is inputted into a target branch (e.g., the in-phase branch or the quadrature branch) of the wireless communication device, and detect an output of the wireless communication device and generate a second target-branch reference value corresponding to the power of the output when the negative value of the first voltage value is input into the target branch. Then, an estimating circuit estimates the DC offset on the target branch according to the first and second target-branch reference values and the first voltage value.

Abstract: Embodiments of the present invention extend the benefits of mobile transmit diversity to the initialization phase of communication with a base station over a random access channel. According to a method of the invention, the transmitter may attempt to initiate communication with a receiver by varying a transmit diversity parameter, for example, phase difference, in addition to or instead of varying power settings.

Abstract: A Radio Frequency (RF) transceiver includes a first RF transceiver group, a second RF transceiver group, local oscillation circuitry, and calibration control circuitry. Each of the RF transceiver group has an RF transmitter and an RF receiver. The local oscillation circuitry selectively produces a local oscillation to the first RF transceiver group and to the second RF transceiver group. The calibration control circuitry is operable to initiate calibration operations including transmitter self calibration operations, first loopback calibration operations, and second loopback calibration operations. During loopback calibration operations, test signals produced by an RF transceiver group are looped back to an RF receiver of another RF transceiver group.

Abstract: In a transmitter 2A, after an output level of a modulated signal is regulated by a first gain regulator 5A, the signal is transmitted from a first antenna 8A without delay, and after the modulated signal is delayed by a delay unit 6A and an output level of the delay output is regulated by a second gain regulator 7A, this signal is transmitted from a second antenna 9A. Similarly, in a transmitter 2B, after an output level of a modulated signal is regulated by a first gain regulator 5B, the signal is transmitted from a first antenna 8B without delay, and after the modulated signal is delayed by a delay unit 6B and an output level of the delay output is regulated by a second gain regulator 7B, this signal is transmitted from a second antenna 9B. A receiver 3 receives the transmitted signals from the four antennas 8A, 8B, 9A and 9B via an antenna 10, and executes a demodulation process.

Abstract: Systems and methods may be provided for transmitter calibration. The systems and methods may include providing one or more radio frequency (RF) test signals at an output of a transmitter, wherein the one or more RF test signals are based upon IQ baseband test signals, and applying an envelope detector to the one or more test signals to obtain one or more characteristic signals from the one or more RF test signals, where the one or more characteristic signals includes one or more first harmonic components and one or more second harmonic components associated with the one or more RF test signals. The systems and methods may further include analyzing the one or more second harmonic components to determine one or more IQ mismatch compensation parameters, and analyzing the one or more first harmonic components to determine one or more carrier leakage or DC offset compensation parameters.

Abstract: The present invention is design for testability (DFT) circuitry used with RF transmitter circuitry to enable RF parameter adjustments, which provide compliance with requirements, to configure the RF transmitter circuitry for a particular application or range of applications, and to permanently store adjustment information, configuration information, or both, in non-volatile memory. The DFT circuitry and the RF transmitter circuitry may be used to form a standard RF module, which can be provided to a number of customers for use in a number of applications. The standard RF module may be adjusted, configured, or both during manufacturing, which may eliminate calibrations, adjustments, or configurations by customers.

Abstract: An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station.

Abstract: Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section that contains at least a reference symbol and that serves for adjusting one or more transmission parameters, and a further section such as a data section. The transponder transmits data back to the base station through modulation and backscattering of the carrier wave. During the transmission of the header section by the base station, the transponder transmits transponder operating information relating to the processing of data to be received and/or transmitted by the transponder, by corresponding modulation and backscattering of the carrier wave. In response to and dependent on the received transponder operating information, the base station adjusts at least one transmission parameter, whereby the highest data transmission rate within the capabilities of the particular transponder can be achieved.

Abstract: In a wireless communication system using a reference channel used for error rate measurement and associated with a plurality of transport channels multiplexed on a coded composite transport channel (CCTrCH), a method is employed for reselection of the reference channel from favorable candidate transport channels. A channel is initially selected from the plurality of multiplexed channels as the reference channel. Channels are monitored based on quantitative data content criteria to determine whether an ON or OFF state exists. A different channel is selected from the plurality of multiplexed channels as the reselected RTrCH when a better candidate transport channel in the ON state becomes available, or when the monitored RTrCH reflects an OFF state.

Abstract: The present invention is a low series impedance directional power detector, which may be used to measure either forward or reverse power in a radio frequency (RF) circuit. The directional power detector includes current detection circuitry to directionally measure current, voltage detection circuitry to measure voltage, and combining circuitry to combine the directional RF current measurements and the RF voltage measurements into a combined RF measurement, which is indicative of directional power. The current detection circuitry and voltage detection circuitry apply any phase-shifts that are needed to detect power in the direction of interest and ignore power in the opposite direction when the directional power detector is presented with a complex load.

Abstract: The present invention relates to a method for checking connectivity between a BSC (Base Station Controller) and an MSC (Mobile Switching Center), including: the MSC loopbacking a circuit and sending a connectivity check command to the BSC to instruct the BSC to perform the connectivity check; the BSC performing the connectivity check according to the connectivity check command; if the connectivity check is successful, the BSC sends a Connectivity Check Success identifier to the MSC to instruct the MSC to cancel the self-loop of the circuit; if the connectivity check fails, the BSC sends a Clear Request message to the MSC to release the communication connection and cancel the self-loop of the circuit. Embodiments of the present invention implement quick and convenient locating of connection errors by adding a Connectivity Check command in the messages for A-interface.

Abstract: A method, wireless communication device, and a base station calibrate relative phase of a plurality of output signals from respectively combined plurality of transmitters (302, 204) in the wireless device (102, 108). An output of a combiner (346) is disconnected (504) from an antenna port (306) of a wireless device (102, 108). A phase position of an output signal from one of the at least two transmitters is set to an initial phase position value (506). The phase position of the output signal is incremented by a given phase increment value until a final phase position value is reached (510). Occurrences of reverse power alarm events are monitored at the initial phase position value, at each incremental phase position value, and at the final phase position value (512). A phase position value for the output signal is selected (516).

Abstract: Provided is a driver circuit that outputs a transmission signal according to a reception signal received from outside, including a first driver that outputs a voltage according to an input first signal; a second driver that receives the voltage output by the first driver as a power supply voltage and outputs the transmission signal according to the power supply voltage and an input second signal; and a control section that delays both the first signal and the second signal, according to a change of the reception signal, and causes the transmission signal according to the reception signal to be output from the second driver.

Abstract: The present invention relates a testing system and a power calculation method thereof. The testing system comprises a control unit and a measuring unit. The control unit is coupled to the wireless module and controls the wireless module to transmit a wireless signal with a default power value. The measuring unit is coupled to the control unit and coupled to the wireless module through a radio frequency cable. The measuring unit is controlled by the control unit for setting a measuring mode of the measuring unit, and measures the wireless signal to output a measured power value to the control unit. The control unit adjusts the default power according to the measured power value thereby compensating for power loss of the radio frequency cable.

Abstract: A transmitter, including at least two transmitter units, each transmitter unit being configured to input an instance of a digital transmit signal, to convert the digital transmit signal to an analog radio signal, and to amplify the analog radio signal. The transmitter is configured to determine a timing difference between the amplified signals, and to adjust timing of at least one of the input signals, so that a predetermined criterion is fulfilled.

Abstract: According to the present invention, there is provided a transmission circuit transmitting a power signal using frequency hopping system from an antenna connected to the transmission circuit through a transmission path, the transmission circuit including: a controller outputting an amplitude set value for each hopping frequency of the power signal before being transmitted according to power level of the power signal at the antenna; a pre-driver controlling the amplitude of the power signal before being transmitted for each hopping frequency according to the amplitude set value; and a power amplifier outputting the power signal to the transmission path according to the signal output from the pre-driver.

Abstract: A calibration method for reducing modulation errors in a telecommunication transmitter apparatus includes providing a plurality of pairs of test signals; the test signals of each pair are substantially in quadrature to each other, and the pairs of test signals are at least in part different with all the pairs of test signals that have a substantially equal energy. A plurality of modulated signals are generated, with each modulated signal that is generated by modulating a corresponding pair of test signals. A plurality of transformed signals are calculated, each one corresponding to the square of a corresponding modulated signal in the frequency domain. A plurality of partial error indicators are calculated, each one as a function of the modulus of a corresponding transformed signal. The partial error indicators are indicative of the modulation errors associated with the modulated signals.

Abstract: A method and a system for determining the dependence between several device-parameter values in each case of at least one device parameter of a mobile telephone (31, 32, . . . , 3m, 3n) and at least one signal parameter of a signal transmitted and/or received by the mobile telephone (31, 32, . . . , 3m, 3n) adjusts several device-parameter values within a mobile telephone (31, 32, . . . , 3m, 3n) of at least one device parameter of the respective mobile telephone (31, 32, . . . , 3m, 3n) for a given number of frequencies of the respectively transmitted and/or received signal, and measures the associated signal parameters of a signal transmitted and/or received by the respective mobile telephone (31, 32, . . . , 3m, 3n). All of the frequencies and the device-parameter values of at least one device parameter respectively associated with every frequency are present in the respective mobile telephone (31, 32, . . . , 3m, 3n) at the start of the measurements.

Abstract: This invention provides a system for evaluating the performance of electronic components and systems by minimizing or eliminating intersymbol interference (ISI). The apparatus includes a transmitter, a device under test, a receiver, and at least one electrical connection between the transmitter and receiver that bypasses the device under test. The electrical connection between the transmitter and receiver transmits information characterizing the intersymbol interference of the transmitted signal to the receiver. The receiver includes an equalizer that uses the information characterizing the intersymbol interference of the transmitted signal to minimize or eliminate intersymbol interference in the received signal where the distortion introduced by the device under test can be isolated and characterized.

Abstract: A radio transmitter includes a transmitter circuit having a transmission output and being configured to generate at the transmission output a signal for transmission; a reference voltage circuit configured to generate a substantially temperature-invariant reference voltage; a reference signal circuit having a reference output and being configured to receive the substantially temperature-invariant voltage generated by the reference voltage circuit and to generate at the reference output an oscillating reference signal of an amplitude that is derived from the temperature-invariant reference voltage; an amplitude sensor having an input and being configured for sensing the amplitude of a signal at the input and generating a sensed amplitude signal indicative of the sensed amplitude; and control apparatus configured to control the radio transmitter to operate in each of: a) a first mode in which it causes the input of the amplitude sensor to be coupled to the reference output; and b) a second mode in which it caus

Abstract: A calibration method and system for reducing modulation errors in a telecommunication transmitter apparatus includes providing a pair of test signals, which are substantially in quadrature to each other, and to repeat an estimation loop. The estimation loop starts with generating a modulated signal by modulating the test signals (the modulation introducing a modulation error) and continues by obtaining a squared signal corresponding to the square of the modulated signal. A transformed signal corresponding to the squared signal in the frequency domain is then calculated. The estimation loop further includes calculating an error indicator, indicative of the modulation error, according to the modulus of the transformed signal. A compensation, to be applied to the test signals for counterbalancing the modulation error, is calculated according to the error indicator and is then applied to the test signals.

Abstract: Briefly, a method to transmit over an uplink channel a training signal having a power level which varies according to a parameter related to downlink channel characteristics is provided. Communication system that includes communication devices to transmit and receive the training signal is further provided.

Abstract: A radio frequency (RF) communications device is provided. The RF communications device includes transmitter circuitry configured to generate a calibration signal on a signal line coupled to an antenna port in a calibration mode of operation and an RF output signal for broadcast across the antenna port subsequent to the calibration mode of operation, tuning circuitry coupled to the signal line and configured to receive the calibration signal, and a controller configured to adjust a signal level of the calibration signal generated by the transmitter circuitry and a tuning of the tuning circuitry during the calibration mode of operation. The transmitter circuitry, the tuning circuitry, and the controller are at least partially integrated on the same integrated circuit.

Abstract: A reception device configured to receive a signal of a transmitted bit string transmitted from a transmission device which transmits a bit string includes: a receiving unit arranged to receive a signal from the transmission device and output a received bit string corresponding to the transmitted bit string; a storing unit arranged to store an error rate table wherein said received bit string is correlated with an error rate of post-data which is data of one bit or greater received following the received bit string being in error; and an error correcting unit arranged to perform error correcting of the post-data of the received bit string.