Abstract: A radio transmission system has an ad-hoc network, which can be used to transmit data packets with a prescribed waveform, for each node a rating device, which rates the quality of the transmission of the data packets via the ad-hoc network, and an orientation channel. The orientation channel is used to transmit the data packets when the rating device has rated the quality of the transmission of the data packets via the ad-hoc network as unsatisfactory.

Abstract: A Doherty-amplifier system has several amplifier stages, of which the inputs are controlled via a control unit with different phase angles and/or signal amplitudes of an input signal. According to the invention, every output of every amplifier stage is connected directly to an antenna element, without the output signals from the amplifier stages being combined with one another before being supplied to the antenna elements.

Abstract: A method for frequency and time synchronization of a receiver for receiving Orthogonal Frequency Division Multiplexing (OFDM) signals is described. A quality criterion of a OFDM signal is determined during one of the frequency intervals (hops) for each point of one of the two-dimensional frequency and time search areas. The area point having the optimum quality criterion (?x, fx) of the OFDM signal is then determined on the basis of said quality criterion, and the receiver is synchronized on the nominal frequency in view of the different between the nominal frequency (f0) and the frequency value (fx) corresponding to the optimum quality criterion. The OFDM signal may be demodulated and decoded starting with the time value (?x) corresponding to the optimum quality criterion.

Abstract: The invention relates to a system for transmitting data according to the frequency hopping method. The digital data, which is transmitted in suddenly changing transmission frequency hops, is encoded according to a woven code consisting of an interlinked external and internal convolution code. The data to be transmitted by hop is preferably distributed over several parallel hops sent with different frequencies.

Abstract: A method and apparatus for processing Orthogonal Frequency Division Multiplex (OFDM) signals is described, in which OFDM signals are conditioned in an OFDM modulated on the transmitter side for each symbol of a data stream to be transmitted and sent as a multicarrier signal. For each OFDM signal, the maximum amplitude of a block is determined for least one block and then normalized to a system-specific, transmitter-specific maximum value.

Abstract: The invention is directed to a polymer and pigment composition utilizing a polyolefin wax produced by metallocene catalysis as a pigment dispersing auxiliary.

Abstract: According to the invention, in order to equalise and demodulate a data signal transmitted to a receiver via a time-variant channel, the scatterer coefficients (damping, delay and Doppler frequency) causing the signal distortions in the channel are determined from the received data signal in the receiver. In this way, the data signal id equalised and then demodulated.

Abstract: The invention relates to a frequency and time synchronization of a receiver (E) for receiving OFDM signals on a fixed carrier frequency. The inventive method is characterized by determining in a first step the approximate nominal value of the frequency and of the time origin of the OFDM signal via a two-dimensional frequency-time search mode and the determination of the area point with the optimum quality criterion of the OFDM signal or via the evaluation of a synchronization sequence transmitted by the transmitter. In a subsequent second step the phase of at least one of the pilot signals transmitted together with the OFDM signal is determined in the receiver (E) and is averaged across several OFDM signal blocks; and a more exact nominal value of the frequency and of the time origin of the OFDM signal is determined therefrom. The receiver (E) is then synchronized to the frequency so determined and the OFDM signal is demodulated with the time origin value so determined.

Abstract: A method for the production of polycondensates. The method is characterized in that waxes and polymer additives are used as lubricating and separating agents during the production of the polycondensate.

Abstract: The invention relates to blends of waxes (component A) and polymer additives (component H) and to the use thereof.

Abstract: The invention relates to a method for the frequency and time synchronisation of a receiving OFDM signals. A quality criterion of the OFDM signal is determined during one of the frequency intervals (hops) for each point of one of the two-dimensional frequency and time search areas. The area point having the optimum quality criterion (&tgr;x,x) of the OFDM signal is then determined on the basis of said quality criterion, and the receiver is synchronised on the nominal frequency in view of the difference between the nominal frequency (fo) and the frequency value (fx) corresponding to the optimum quality criterion. The OFDM signal is demodulated and decoded starting with the time value (&tgr;x) corresponding to the optimum quality criterion.

Abstract: The invention relates to a system for transmitting data according to the frequency hopping method. The digital data, which is transmitted in suddenly changing transmission frequency hops, is encoded according to a woven code consisting of an interlinked external and internal convolution code. The data to be transmitted by hop is preferably distributed over several parallel hops sent with different frequencies.

Abstract: The invention relates to the use of polyolefin waxes, which are produced by means of metallocene catalysis, for improving the dispersion of pigments in polypropylene.

Abstract: The invention relates to the use of polyolefin waxes, which are produced by means of metallocene catalysis, for dispersing pigments in plastics.

Abstract: The invention relates to a method for transmitting OFDM signals which arc conditioned in an OFDM modulator on the transmitter side for each symbol of the data stream to be transmitted and sent as a multicarrier signal. For each OFDM signal, the maximum amplitude of a block is determined for at least one block and then normalized to a system-related transmitter-specific maximum value.

Abstract: A colorant composition consisting essentially of one or more colorants finely dispersed in an amorphous poly-.alpha.-olefin which is composed of at least two different monomers having a butene-1 content of at least 25% by weight and melts at between 70.degree. and 150.degree. C., and a free-flow agent provides the way to dust-free colorant compositions for masterbatch production, the production of compounds and the direct coloration of plastomers and elastomers.