Abstract: The invention relates to a method for determining the envelope curve of a modulated input signal (5) with the following method steps: generation of digital samples (An) by digital sampling (1) of the input signal (5), generation of Fourier-transformed samples (Bn) by Fourier transformation of the digital samples (An), generation of sideband-cleaned, Fourier-transformed samples (B?n) by removing the range with negative frequencies or the range with positive frequencies from the Fourier-transformed samples (Bn), generation of inverse-transformed samples (Cn) by inverse Fourier transformation (4) of the sideband-cleaned, Fourier-transformed samples (B?n) and formation of the absolute value of the inverse-transformed samples (Cn).

Abstract: To measure the effective directivity and/or the effective source port match of a test port of a system-calibrated vector network analyser, a precision air line short-circuited at the outlet is connected, and the complex reflection coefficient is measured at the inlet of this precision air line at a sequence of measuring points within a predefined frequency range. At the same time, for the effective directivity the sequence of the measured complex reflection coefficients is subjected to a discrete Fourier transformation and the baseband filtered out of the spectrum thereby formed. The sequence of effective directivity values is obtained by subsequent inverse Fourier retransformation.

Abstract: The invention relates to a method for correcting errors by de-embedding scattering parameters of a device under test associated with measuring ports (11), the parameters being measured by a vector network analyzer including n measuring ports. The aim of the invention is to create a universal, precise and fast method of correcting errors of scattering parameters. To this end, the method includes the following steps: formula (1) two-port calibrations are carried out on different calibrating standards in any order in the active state between the measuring ports (11), as a basis for a first error correction; the reflection parameters of at least one part of the n measuring ports (11) are determined in the inactive state, by way of the results of two-port measurements carried out on at least one calibrating standard switched in the active and/or inactive state on measuring ports (11), as a basis for a second error correction.

Abstract: A measuring device includes a representation device on which dialog windows can be represented, in addition to a method and software for managing said dialog windows. Several parameters can be adjusted for at least one part of the functional units and input through the dialog windows. Each newly opened dialog window is associated with a soft key and represented by an icon in a window management strip. The respectively associated dialog windows can be placed in the forefront using the soft keys.

Abstract: The invention relates to a transmitter and receiver device (1) for a cellular radio network, comprising a transmitter installation (6a) and a receiver installation (8a) located at a spatial distance to said transmitter installation (6areceiver (7) is connected to said transmitter installation (6a) and time-controls the transmission of transmission blocks by the installation (6a). The receiver installation (8a) is not provided with a time standard receiver. Instead, the receiver instal (8a), by intercepting the transmission signal emitted by the transmitter installation (6a) located in the same cell, generate signal for synchronizing the time of a timer of the receiver installation (8a).

Abstract: A method and system for determining the average long-term is described, in which a short-term power of a segment of the input signal is determined and a data sequence is produced that is contained in the segment and with which the input signal is modulated. A reference signal is produced by modulation with the data sequence at a predetermined reference control factor of a modulator, in which a long-term power of the reference signal corresponds to the reference control factor, and a short-term power of the reference signal within the segment is determined. A correction value is determined by comparing the short-term power of the reference signal with the long-term power of the reference signal corresponding to the reference control factor; and the short-term power of the segment of the input signal is corrected based on the correction value in order to obtain the long-term power of the input signal.

Abstract: The invention relates to an antenna coupler (1) for testing mobile transmitters and/or receivers, in particular mobile telephones (2). Said coupler has a receiving element (4) and/or a bearing surface (20) for the mobile transmitter and/or receiver and at least one antenna element (5, 25, 35). According to the invention, the antenna element (5, 25, 35) is configured as a loop that is essentially closed in spatial terms.

Abstract: The aim of the invention is to process OFDM signals which are simultaneously received via a multiple antenna system having a plurality of separate receive channels. To this end, the channel correction values or the confidence values are determined in the receive channels for each carrier of the OFDM signal while using known techniques. In addition, the I/Q values of each individual carrier of the OFDM signal which are obtained in the OFDM demodulator are weighted with these channel correction values or confidence values. Afterwards, the I/Q values weighted in such a manner are totaled.

Abstract: A device for calculating the steady state behavior of a controller includes an amount generating unit for generating the amount of deviation of the regulator, a first threshold value calculation unit that detects whether the amount of deviation of the regulator has fallen below a first threshold value and then starts a lag time delay unit, and a second threshold value calculation unit that detects whether the amount of deviation of the regulator has fallen below a second threshold value. A signal transmission unit transmits a ready message signal when the lag time delay unit has reached a predetermined lag time and the second threshold value calculation unit has detected that the amount of deviation of the regulator has fallen below the second threshold value.

Abstract: A method for synchronization of an input-chip-sequence (x(?)) of a CDMA-signal with a Pilot-Chip-Sequence (pn(?)) having the method steps of: dividing the Pilot-Chip-Sequence (pn(?)) into subintervals (1, 2, 3 . . . 8); assembling a particular number (2·AnzSub) of the subintervals (1, 2, 3 . . . 8) into subinterval groups; forming at least one summed subinterval group(s) (pn?1 (?), . . . ) by linewise, pairwise arranging respective one-following-the-other subintervals (1,2; 2,3; 3,4; . . . 8,1), with the first subinterval of a particular line being respectively the second subinterval of the previous line, and column-wise adding the chips of all the line-wise, pair-wise arranged subintervals (1,2; 2,3; 3,4; . . . 8,1); and correlating the input-chip sequence with each summed subinterval group (pn?1 (?), . . . ) in a first correlation (5; 5a; 5b) for determining a displacement (Ôffset) between the input-chip-sequence and that of the summed subinterval group(s) (pn?1 (?), . . . ).

Abstract: A frequency arrangement with at least two successive heterodyne stages, one of which converts an input signal with an adjustable first frequency of a superposition oscillator that can be set in fine frequency increments into a first intermediate frequency, a second heterodyne stage that converts an input signal with a fixed second heterodyne frequency of a second superposition oscillator into a second intermediate frequency, the difference frequency between the first and second heterodyne frequencies is converted with an adjustable frequency divider into a lower frequency, which is then compared in a phase detector to the output frequency of a reference oscillator which is implemented as a synthesizer that can be set in fine frequency increments, the first superposition oscillator being synchronized with the output frequency of the reference oscillator via a phase control loop with the output signal of this phase detector, and the adjustable frequency divider preferably being a fractional N-divider with singl

Abstract: A method for adjusting a phase angle (?) of a phase modifier (25) of a transmitting device which includes a quadrature modulator (3), a power amplifier (9), a quadrature demodulator (19) and differential amplifiers (26, 27). The power amplifier (9) is linearized via the feedback loop (16) according to the Cartesian feedback method. The phase modifier (25) supplies an oscillator signal to the quadrature demodulator (19), which signal is shifted by the phase angle (?) to be adjusted with regard to the oscillator signal that is supplied to the quadrature modulator (3). An input signal with a constant inphase component (I) and a constant quadrature phase component (Q) is applied during each transmission burst in the instance of a closed feedback loop, and the quadrature component (VQM) and/or the inphase component (VIM) is measured at a measuring point (53, 61) located behind the output of the differential amplifiers (26, 27).

Abstract: A signal analyzer and a method for displaying code-channel power levels of CDMA (Code Division Multiple Access) signal that contains code changes having different spreading factors. The individual code-channel power level is measured from a received signal and displayed in a diagram for a specified base spreading factor. The code channels having an alias power level are indicated. A code channel, with regard to the specified base spreading factor, has an alias power level when the code channel having the base spreading factor is inactive and when a code channel of a higher spreading factor (corresponding to the former code channel) is active, or, in the event of orthogonal transmit diversity, the power level of a code channel is mapped onto the code channel of the base spreading factor.

Abstract: The disclosure relates to a system for the operation of digital radio devices adjustable according to different waveforms and having a common waveform that is predetermined by a radio center. The system divides the sets of parameters which define the waveforms into several sets of partial parameters that are associated with addresses. In the radio devices which are due to be operated in common, the respective sets of partial parameters are stored at the addresses. In order to set a common waveform, only the addresses of the partial parameters required for the selected waveform are transmitted and selected by the radio center as the set of parameters determining the selected waveform, by means of a radio link common to all of the radio devices.

Abstract: The invention relates to an arrangement for controlling the output power of a high-frequency transmitter. The control power of the transmitter output stage is controlled according to a correcting variable (R) and by means of an actuator, whereby said variable is obtained by comparing the output power to a desired value (S). An I./Q modulator (M) is used as actuator.

Abstract: A method of determining the power parts of the codes of a CDMA signal transmitted in different time slots, which includes a pilot channel and at least one dedicated physical channel. The pilot channel and the dedicated physical channels are assigned different orthogonal codes, and the time slots of the dedicated physical channels can be shifted in time. The method includes determining a momentary power part as a function of time in the raster of time slots of the pilot channel if the orthogonal code is active, and determining a mean power part using the length of the time slot of the pilot channel and displaying the mean power part as a function of the time in the raster of time slots of the pilot channel if the orthogonal code is not active.

Abstract: The invention relates to a transmitting device (19) including a quadrature modulator (3) for carrying out the quadrature modulation of a complex input signal (I, Q) and including a power amplifier (9) connected in outgoing circuit to the quadrature modulator (3). A quadrature demodulator (19) for carrying out the quadrature demodulation of the output signal of the power amplifier (9) is provided for a feedback loop. A first differential amplifier (26) and a second differential amplifier (27) are connected in incoming circuit to the quadrature modulator (3). The input signal and the fed back quadrature modulated signal are supplied to the inputs of the differential amplifiers.

Abstract: The invention relates to a method and a measuring device for determining a characteristic curve of a high frequency transmitter for transmitting a high frequency signal modulated with a modulation signal. A high frequency signal transmitted by the high frequency transmitter is received by a receiving device (16) and samples of a complex value, real baseband signal (MEAS) are generated therefrom. By demodulation of the samples of the real baseband signal (MEAS), a modulation symbol sequence (SYM) is obtained, from which an ideal baseband signal (REF) is simulated as reference signal. The real baseband signal (MEAS) is corrected, a corrected, real baseband signal (MEAS?) is generated and the deviations of the samples of the corrected, real baseband signal (MEAS?) from the samples of the ideal baseband signal (REF) are evaluated.

Abstract: An interpolator includes a half band filter, a first polyphase filter, a second polyphase filter and a linear interpolation filter. The polyphase filters, respectively, interpolate before and after an interpolation instant (?)t/Tr1) prescribed by a control signal (S).

Abstract: An apparatus for the determination of the magnitude of a noise (TDUT) of an electronic object to be measured (2) includes a sine signal source (1), which generates a sine signal (Sin) for input into said object to be measured (2) and a level meter (3) for the measurement of a power level at the output of the said object to be measured (2). In accord with the invention, the level meter (3) possesses a sine power detector device (31) for the capture of a sine power level ({circumflex over (P)}sin) and has a noise power level detector device (32) for a separate capture of a noise power level ({circumflex over (P)}noise).