Abstract: A receiver that operates to recover data from spread spectrum radio signals, which include radio signals generated from a combination of the data and a data spreading code associated with the user and radio signals generated from a combination of a predetermined sequence of pilot data and a pilot spreading code. The receiver includes a plurality of antennas, each arranged to detect a different version of the radio signals. Base band conversion means is coupled to the plurality of antennas and arranged to generate, for each antenna, base band signal samples representative of the version of the radio signals.

Abstract: A method for estimating a channel from received signals transmitted via the channel, includes the steps of receiving the received signals with receiving sensors of a receiving device. The received signals are composed of a plurality of subscriber signals. The subscriber signals are marked with transmitter-specific fine structures. A subscriber signal of the plurality of subscriber signals is transmitted by a plurality of wave elements having differing incidence directions at a receiving point. An incidence direction of at least one of the wave elements is obtained in the receiving device. Directionally selective channel impulse responses are determined from the plurality of received signals and the incidence direction of the at least one wave element.

Abstract: A method for transmitting data between radio stations in a radio communication system includes superimposing first signaling information items with second information items at a transmitting end to form an aggregate signal. The aggregate signal is transmitted in a frequency channel, for distinguishing the first signaling information items and the second information items with the aid of individual fine structures. A received signal is evaluated at a receiving end. Initially an influence of the first signaling information items on the second information items is reduced by a compensation calculation carried out with reference to the received signal. Subsequently, the second information items are detected in the received signal already subjected to the compensation calculation. The method can be used in particular with a TD/CDMA transmission process. A receiver and a mobile station are also provided.

Abstract: A method for measuring characteristics of radio channels, in which the signals are received by a total of M1 receiving sensors in a linear antenna array, in which case the respective received signals are composed of wave elements of a transmitted signal with a different incidence direction and different delay, the transmitted signal contains a preselected test sequence, and the incidence angle as well as the delay of the dominant wave fronts are estimated simultaneously, taking account of the chip signal form of the test sequence, the signals from each antenna sensor are demodulated, and sampling is then carried out with Mc samples per chip in the test sequence.

Abstract: A method for allocating radio channels in a radio communications system having timeslots includes the steps of allocating the radio channel for the downlink direction to a mobile station as a function of a channel allocation pattern which indicates the transmission power levels for the timeslots. The mobile station corrects the allocation of the radio channel as a function of an interference pattern which indicates the interference power levels in the timeslots. The allocation process results in the transmission power level being distributed as uniformly as possible between the timeslots which are provided for a connection from the radio station in the downlink direction, wherein the allocation process is a function of the occupancy of the timeslots in accordance with the channel allocation pattern.

Abstract: Space covariance matrices are first defined for a kth link from the base station to a wireless station and for a sum of further radio stations, that is to say, in the latter case, the interference for the kth link. In a second step, a beam forming vector w(k) is calculated for the link such that the signal-to-noise ratio in the receiver is maximized. A general intrinsic value problem is thereby solved without iterations. Transmission signals are then weighted with the beam forming vector for the link, and are supplied to the antenna elements for transmission. The method is suitable for TDMA/CDMA and CDMA transmission methods using smart antennas.

Abstract: The characteristics of radio channels are measured. The signals received by a plurality Mc of receiving sensors of a two-dimensional antenna array are composed of wave elements of a transmission signal with regard to the azimuth and the elevation of a different two-dimensional incidence direction and different delay. The transmission signal contains a preselected test sequence, and the incidence angle as well as the delay of the dominant wave fronts are estimated simultaneously taking account of the chip signal form of the test sequence. The signals of each antenna sensor are demodulated, and sampling is then carried out with Mc samples per chip in the test sequence.

Abstract: A radio communications receiver for detecting first and second contemporaneously transmitted radio signals representative of first and second data. An adaptive antenna detects at least one wave front from the first radio signals, and at least one wave front from the second radio signals. A first radio detector which regenerates first data from the first wave front. An interference canceller subtracts the first radio signals, reconstituted from the first data, from the second wave front, dependent on interference from the first wave front to the second wave front. A second data detector regenerates the second data from the second wave front after the subtraction of the first wave front consequent upon the second radio signals. The first and second data are communicated contemporaneously on at least common parts of the radio frequency spectrum.

Abstract: Signals in the form of wave elements of one or more subscriber signals are received at a receiving device assigned a number Ka of receiving sensors and the direction of the signals is estimated. Ka received signals are received via the receiving sensors and are composed of at least one subscriber signal which has a transmitter-specific fine structure impressed on it. A kth subscriber signal, with k=1 . . . K, is transmitted by means of Kd wave elements whose directions of arrival at the receiving location differ. Channel impulse responses assigned to the Ka receiving sensors are determined from the received signals, and the direction of arrival of at least one wave element is determined from the channel impulse responses. The direction estimation can advantageously be used in mobile radio, radar, sonar or seismic measurement systems.

Abstract: Signals distorted by multipath propagation are reconstructed. In a first step, the incidence direction of the wavefronts, that is to say of the respective d dominant signal components, is estimated and the signal components are reconstructed. The wavefronts are separated as a result of the first step. A second step reconstructs the signals distorted by multipath propagation with the aid of the wavefronts, separated by spatial direction, and therefore with the aid of the reconstructed signal components, through combination of the signal components, by assigning the determined d dominant signal components to the l associated signal sources and, expediently, determining delay times and weighting factors with a view to optimal combination of the signal components in order to reconstruct the signals.

Abstract: A radio communications receiver which detects radio signals and recovers data representative of the radio signals in a presence of contemporaneously detected interfering signals, the radio communications receiver having a detector that detects said radio signals and generates digital base band signals representative of the radio signals, a matrix former that forms a correlation matrix having rows and columns from the base band signals, and a data processor that generates a factor matrix of the correlation matrix, the factor matrix having rows and columns, and recovers data from the factor matrix. The data processor generates the factor matrix by calculating first elements of the factor matrix from the correlation matrix using a factorization algorithm in accordance with a pre-determined structure of the factor matrix, and forming second elements of the factor matrix by selectively copying first elements in accordance with the pre-determined structure.

Abstract: A method is specified for the high-resolution evaluation and, if appropriate, for the recovery of narrow-band signals, received by a centrosymmetrical sensor group (AG), for directional estimation. A method is also specified for the high-resolution evaluation of superimposed non-attenuated harmonic signals for spectral analysis in the case, if appropriate, of multi-channel observations. For directional estimation, signals which are noisy and disturbed by multipath propagation can be prepared for recovery. The method for directional estimation is particularly suitable for signal evaluation in mobile radio systems or wireless communication systems, in high-resolution radar image processing systems, sonar systems, and medical technology systems. The method for frequency estimation is suitable for image processing applications, and for a multiplicity of spectral analysis applications.

Abstract: A method for high-resolution spectral analysis in multi-channel observations is disclosed with which it is possible to detect ventricular late potentials in individual heartbeats. The method also offers the basis for the spatial localization of pathological tissue modification that has a cause-and-effect relationship to the creation of these late potentials. The applicability of the method of the invention can be similarly applied to problems in radar or sonar technology, astronomy, measuring mobile radio telephone channels or to other problems of seismic or medical signal processing.