Patents Assigned to Rohde and Schwarz
  • SIGNAL ANALYZER AND METHOD FOR DISPLAYING POWER LEVELS OF CODE CHANNELS
    Publication number: 20060056359
    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.
    Type: Application
    Filed: April 29, 2003
    Publication date: March 16, 2006
    Applicant: Rohde & Schwarz GmbH & Co. KG
    Inventors: Jens Franke, Bernhard Nitsch, Klaus Heller
  • System for the common operation of digital radio devices adjustable according to different waveforms
    Patent number: 7003314
    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.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: February 21, 2006
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Peter Iselt
  • Arrangement for controlling the output power of an HF transmitter
    Patent number: 6999524
    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.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: February 14, 2006
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Thomas Boegl, Reinhard Ritschel, Thomas Valten
  • Method of finding the power parts of the code of a CDMA signals
    Patent number: 6993003
    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.
    Type: Grant
    Filed: October 3, 2001
    Date of Patent: January 31, 2006
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Johann Huber
  • Transmitting-receiving device comprising a closed cartesian feedback loop
    Patent number: 6977968
    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.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: December 20, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Friedrich Lipp
  • Measuring device and method for determining a characteristic curve of a high frequency unit
    Patent number: 6973401
    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.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: December 6, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Joachim Eibl, Jochen Pliquett, Hagen Eckert
  • Interpolator and interpolation method when interpolating a digital input signal sequence at interpolation instants prescribed by a control signal
    Patent number: 6968353
    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).
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: November 22, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Kurt Schmidt
  • Procedure and apparatus for the determination of the noise level of an electronic object to be measured
    Patent number: 6965242
    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).
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: November 15, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Hermann Boss, Kurt Schmidt, Markus Freidhof
  • Signal-processing device
    Publication number: 20050242981
    Abstract: A signal-processing device includes an analog-to-digital converter for the generation of a digital input signal from an analog input signal, an intermediate memory for the intermediate storage of the digital input signal and a digital signal-processing unit for the digital processing of the digital input signal. The signal-processing unit can be switched by means of a switching device in such a manner, that the signal-processing unit is series-connected optionally either to the intermediate memory or, by-passing the intermediate memory, to the analog-to-digital converter.
    Type: Application
    Filed: April 11, 2005
    Publication date: November 3, 2005
    Applicant: Rohde & Schwarz GmbH & Co. KG
    Inventors: Kurt Schmidt, Markus Freidhof
  • Method for displaying the modulation error of a multiple carrier signal
    Patent number: 6954420
    Abstract: The invention relates to a method for displaying the mean modulation error MERRMS of a multiple carrier (OFDM) signal in which: a) The square of the error vector is calculated according to the relation (I) for each actual modulation symbol I of each individual carrier k of the multiple carrier signal; b) this value mk is offset with the content of a storage location of a memory, said storage location being assigned to the same carrier k, which comprises the same number of storage locations as the OFDM signal carrier, according to relation (II) (iteration formula) with A2k,1+1: new measured value (instant 1+1) which should be filed in storage location k of the memory A2; A2k,l+l: previous measured value (instant 1) from storage location k of memory A2; mk: Actual measured error square for carrier k; k: Carrier number within the OFDM spectrum, grows with the frequency, k=0 . . .
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: October 11, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Peter Wolf, Christoph Balz
  • Method and apparatus for estimating the frequency and/or phase of a digital signal
    Patent number: 6947508
    Abstract: An apparatus and method for estimating a frequency and/or a phase of a digital input signal by determining phase values of the input signal. The phase values are then added over a predetermined summation length N/B. The sampling rate of the added-up phase values are reduced by a factor N/B in comparison with the sampling rate of the phase values. The added-up phase values are delayed in a chain of at least B?1 delay elements. The differently-delayed added-up phase values are then added or subtracted to create a resulting. pulse response of the frequency such that the resulting pulse response of the frequency is constant positive in a first interval, is zero in a second interval and is constant negative in a third interval, so that a resulting pulse response of the phase is constant in at least a middle interval or is otherwise zero.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: September 20, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Markus Freidhof, Kurt Schmidt
  • Process and apparatus for correction of a resampler
    Patent number: 6931085
    Abstract: An apparatus for correction of a resampler is provided, with which a sampled input signal, that is subjected to an input sampling rate and which has a chip frequency that differs from the input sampling rate, is converted into a sampled output signal for which the sampling rate corresponds with the chip frequency, by changing the input sampling rate by a resampling factor. The input signal is subjected to a non-linear operation so that a spectral line is produced at the chip frequency. A frequency shifter spectrally shifts the input signal by the chip frequency. The phase of the shifted spectral line at the chip frequency is determined as a function of sampling time points. On the basis of a regression of the phase of the shifted spectral line at the chip frequency, the resampling factor is corrected and/or the output signal is time-wise shifted by a time correction value.
    Type: Grant
    Filed: July 27, 2001
    Date of Patent: August 16, 2005
    Assignee: Rohde & Schwarz GmbH & Co., KG
    Inventors: Klaus Heller, Kurt Schmidt
  • Method for determining the phase-and/or amplitude-noise spectrum of a digitally modulated signal
    Publication number: 20050175127
    Abstract: A method for determining the phase and/or amplitude noise spectrum of a digitally modulated input signal. The method for determining a phase-noise spectrum comprises generating real complex samples, by digitally sampling a phase component and phase quadrature component of the input signal in baseband, determining ideal complex samples from generated real samples, establishing complex quotients from the real and ideal complex samples, generating modified complex quotients by assigning the value 1 to the complex quotients, and subjecting the modified complex quotients to a Fourier transform. The invention also concerns a similar method for determining the amplitude noise spectrum of the digitally modulated input signal.
    Type: Application
    Filed: April 4, 2005
    Publication date: August 11, 2005
    Applicant: Rohde & Schwarz GmbH & Co. KG
    Inventors: Christoph Balz, Martin Hofmeister
  • Arrangement for optimizing the data transmission over a bidirectional radio channel
    Patent number: 6922401
    Abstract: The invention relates to an arrangement for optimizing the data transmission over a bidirectional radio channel. According to the invention, the digital data to be transmitted according to a data transmission protocol is divided into individual data packets in each of two transmitting/receiving stations. In each transmitting/receiving station, the number and/or priority and/or type (e.g. information, control characters, repeat blocks) of the data packets generated by the data transmission protocol of the higher level and transmitted to the respective transmitter of the station is determined (data packet identifications). According to the data packet identifications, the data transmission protocol is then selected in at least one of the stations in accordance with an optimum utilization of the radio channel capacity.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: July 26, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Werner Dirschedl, Rainer Riek, Guenter Greiner
  • Method for measuring and evaluating multi-carrier signals
    Patent number: 6920174
    Abstract: For measuring and evaluating multi-carrier signals the I and/or Q components obtained by demodulation are integrated across several values and are graphically shown for every single carrier or combined carrier groups of the multi-carrier signal on the screen display unit. To this end, the individual carriers or carrier groups are applied side by side on the horizontal axis of a diagram and the I and/or Q components that pertain to the carriers or carrier groups are recorded along a vertical line.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: July 19, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Peter Wolf, Christoph Balz
  • Balanced-to-unbalanced transformer
    Patent number: 6917254
    Abstract: A method relating to a balun for transmitting a high degree of high-frequency power where metal sheet element is soldered onto the loop conductor tract of the symmetrical circuit loop, the conductor track being configured as a printed circuit. The metal sheet element is leaked with a cooling element on the electrically cold mass point of the loop.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: July 12, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Bernhard Kaehs
  • Radio device with remote control
    Patent number: 6914888
    Abstract: A radio device with a plurality of adjustable transmitting and receiving functions is provided. According to the invention, the operating functions can be remotely controlled and remotely monitored via a remote control device. To this end, the remote control device is connected via a radio relay to an interface of the radio device, to which additional protective measure for securing a fault-free transmission of the operating functions and information are assigned. In addition, a device is provided on the remote control device for the input and output of the information to be transmitted with the radio device.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: July 5, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventor: Peter Iselt
  • Power detector with constant voltage decoupling
    Publication number: 20050116701
    Abstract: A power detector for measuring the average power, without constant voltage, of modulated or unmodulated high frequency or microwave signals is described. The power detector includes a signal line connected to a high frequency input. A detection line is capacitively and/or inductively coupled to the signal line and, seen in the longitudinal direction, is connected to the signal line. The signal is tapped from the detection line at two or more detection positions which are staggered in the longitudinal direction.
    Type: Application
    Filed: January 28, 2003
    Publication date: June 2, 2005
    Applicant: Rohde& Schwarz GmbH & Co. KG
    Inventors: Gerd Hechtfischer, Michael Katzer
  • Method for measuring the receiver-side bit error rate of a DVB transmission system
    Patent number: 6877129
    Abstract: The invention relates to a method for measuring the receiver-side bit error rate of the transmission path of a DVB transmission system in which the data stream to be transmitted is channel-coded on the transmitter side by a Reed-Solomon coder and on the receiver side channel-decoder by a corresponding Reed-Solomon decoder. According to the method, a test data stream is fed in on the transmitter side and the Reed-Solomon coder is switched off so that the receiver-side decoder recognizes a data stream with non-correctable errors and allows the same to reach the output uncorrected. The bit error rate is then determined from the uncorrected test data stream.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: April 5, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Christoph Balz, Franz Josef Zimmermann, Harald Ripp, Josef Handi
  • Microwave switching with illuminated field effect transistors
    Patent number: 6876271
    Abstract: An electronic microwave circuit (1) with field effect transistors which are integrated on at least one semiconductor chip (2), has a light source (3), which radiates the field effect transistors with light and possesses a housing (6) which encloses in a microwave excluding manner the semiconductor chip (2) and the light source (3) or a light conducting means (8) connected with the light source (3).
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: April 5, 2005
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Christian Evers, Wolfgang Cohrs, Gerd Hechtfischer, Martin Hassler, Thomas Will