Abstract: A procedure for the semi-blind separation and detection of digital co-channel signals, whereby after a simultaneous spatial-temporal equalization, iterative projections of the symbol vectors to be detected, in a vector subspace or a symbol alphabet &OHgr; of finite size are initialized making use of a network user identifier IDi. These projections are then used to adapt the symbol vectors Si to the vector subspace and to the symbol alphabet &OHgr; of finite size, making use of the method of least squares algorithm but performing only matrix multiplications without eigenvalue or singular decompositions.

Abstract: A beamforming method and device for adaptive antenna arrays including several antenna elements (1.1. to 1.M) in the downlink of frequency duplex systems, wherein antenna weights (Wk(fS)) are determined for the antenna elements (1.1 to 1.M) for downlink transmission on the basis of directional information of the uplink; in detail, the antenna weights (Wk(fS)) for downlink transmission are determined on the basis of the power angle spectrum (APSk) of the uplink of the individual users (B1 to BK), wherein the power angle spectrum (APSk) is modified by masking out undesired regions.

Abstract: For each K subscriber of a cellular mobile radio network who is supplied with one and the same frequency and one and the same time slot a decision-feedback and therefore non-linear antenna pre-processing facility with a decision-feedback structure is used comprising forward filters backward filters and decision circuits for the adaptation of the antenna weighting factors, wherein the backward filters are adapted to the length of the processing window D of MLSE, and the output signals of the forward filters for the actual data detection are taken to the MLSE of the subscriber concerned, before the subtraction of the feedback component takes place. Each of the receiver structures similar to K can be adapted and operated independently from the other K-1 structures. A common vectorial MLSE for the common data detection of all K subscribers can be employed.

Abstract: A group antenna has the weighting factors of the individual antenna elements and a forward and backward filter adapted based upon a decision circuit at the input of which the output signals of the two filters are subtracted one from the other. A Maximum Like Sequence Estimator receives the output of the forward filter directly while the decision feedback process is shut down for detection of subscriber data whereas the MLSE operates in parallel with the decision feedback process for continuous adaptation of the weighting factors.

Abstract: In a receiver for digitally modulated signals in mobile communication systems, the reception signal can be represented as a complex vector. The signal undergoes homodyne or heterodyne incoherent conversion into the baseband by means of a mixing stage with mixers M. This involves splitting into the real component and the imaginary component. The signal components are filtered by low-pass filters (TP) and digitized with analog-digital converters (AD). The sampled values are converted into the magnitude and angle of the vector. The magnitude value (B) controls the gain of the preamplifier (VV) and of the low-pass filters (TP), the reception data (D) are recovered from the difference between two successive angle values (W).

Abstract: An antenna for transmitter and receiver of a portable radio appliance (cordless telephone, mobile telephone, pager, telepoint appliance and so forth) essentially consists of two sheet-metal angles (2,3) which are arranged adjacently to one another. One of the two elements is excited with radio-frequency currents by means of a coaxial feedline (4). The second sheet-metal angle (3) is excited by parasitic coupling from the first sheet-metal angle (2). The sheet-metal angles (2,3) are identically oriented and the distance between them is much shorter in the end area than at the bending edge of the apex line. This results in high reactive currents and low impedance. The antenna can also be modified by feeding both sheet-metal angles (2,3), dividing it into two identical part-antennas or several sheet-metal angles. The sheet-metal angles can consist of metal foils which are applied to a plastic housing. In addition, an embodiment with wire angles is also possible.