Abstract: For example in case of an OFDM multicarrier transmission system the transmission characteristics of subcarriers of a multicarrier transmission system using a plurality of antenna elements (3, 3?) can be adjusted. Particularly the power and the phase of the subcarriers can be adapted. To this object the subcarrier frequency channel (2, 2?) characteristics of the multicarrier transmission are detected (11, 11?) at the side of the transmitter (3). The power of each subcarrier is then distributed by a weighting unit (14, 14?). The subcarriers can be further pre-equalized (1, 1?) by dividing the subcarrier signal respectively by the sum of the squared magnitude of the frequency channel characteristics of all subcarrier signals or a frequency characteristic of the selected antenna element (3, 3?).

Abstract: A transmitting device for transmitting data symbols and pilot symbols in an OFDM transmission system; the device comprising symbol generating means for generating said data symbols and said pilot symbols, means for transmitting said data symbols and pilot symbols respectively by using a plurality of subcarriers of said OFDM transmission system, wherein said symbol generating means is designed to selectively generate a first type pilot symbol and a second type pilot symbol being orthogonal to said first type pilot symbol so that a pilot symbol pattern in the frequency dimension comprises at least said first type pilot symbol to be transmitted by using a predefined subcarrier and second type pilot symbol to be transmitted by using other predefined subcarrier, and wherein said pilot symbol pattern has a different pattern from a succeeding pilot symbol pattern in time dimension.

Abstract: A spatial diversity receiver for wirelessly receiving a modulated RF signal and a method for wirelessly transmitting and receiving the modulated RF signal. The spatial diversity receiver includes at least two antenna arrays and an antenna beam selection control unit. Each antenna array of the spatial diversity receiver includes at least two fixed beam antennas with distinct radiation patterns, and combinations of the fixed beam antennas are selectable for wireless receipt of the modulated RF signal. The antenna beam selection control unit is configured to control at least one antenna switching and/or combining unit in order to select a specific combination of fixed beam antennas from each antenna array.

Abstract: A transmitting device for transmitting signals carrying data in a wireless communication system, including at least two beam antennas, each beam antenna having a main beaming direction at a different angle; a generator configured to generate a number of signal streams to be transmitted over a wireless communication channel within the wireless communication system, wherein each of the signal streams includes a different version of the data and the number of signal streams corresponds to the number of the at least two beam antennas, wherein each signal stream is transmitted over the wireless communication channel via a different beam antenna of the at least two beam antennas; and a cyclic delay diversity unit configured to cyclically shift each different version of data and to use cyclic delay diversity.

Abstract: A communication system including a first station having at least two first narrow beam antennas and a second station having at least two second narrow beam antennas. The first and second stations establish a first communication path for wireless communication via a pair of first and second narrow beam antennas. When communication via the first communication path is disturbed by obstacles, the first and second stations automatically establish at least one alternative communication path, which is spatially different from the first communication path, for wireless communication using the at least two first narrow beam antennas and the at least two second narrow beam antennas.

Abstract: An apparatus for transmitting and receiving signals in a wireless telecommunication system and to a method for transmitting random access bursts in such an apparatus. The apparatus includes a transmitter for transmitting random access bursts, a receiver for receiving acknowledgement information confirming a successful transmission of a random access burst, a decision unit for deciding if acknowledgement information has been received, and a control unit for randomly choosing a time point for an attempt to retransmit said random access burst from an interval if no acknowledgement information has been received after a random access burst had been transmitted.