Abstract: A user equipment includes a plurality of antennas to receive downlink signals from a base station, a plurality of receiver circuits each coupled to a respective one of the plurality of antennas to process the received downlink signals, an SIR estimation unit to estimate a quality of the received downlink signals, a power loop controller to generate transmit power control commands based on the estimated quality of the received downlink signals, the transmit power control commands being directed to the base station to adjust a power of the downlink signals and a diversity controller to selectively activate and deactivate one or more of the receiver circuits depending on the estimated quality of the received downlink signals.

Abstract: A radio receiver apparatus of a cellular network includes a channel estimator configured to calculate channel estimates on the basis of a common pilot channel. The apparatus further includes a weight calculation unit configured to calculate a weighting factor on the basis of a signal power of the common pilot channel and control data depending on a transmit signal power of a dedicated data channel. The control data is signaled by the cellular network to the radio receiver apparatus. The radio receiver apparatus further comprises a combiner that combines the signals from multiple cells by using the channel estimates and the weighting factor.

Abstract: A method of operating a Rake receiver circuit includes determining a first property of a first signal received over a dedicated channel and over a first transmission path. The method further includes determining a delay profile of a second signal and determining, on the basis of the delay profile and the first property, if the first transmission path is to be assigned to a Rake finger of the Rake receiver circuit.

Abstract: A receiver includes an input to receive data of a pilot channel having a carrier frequency associated therewith, and a first unit to obtain a quantity, wherein the quantity depends on a frequency broadening of the received data and a frequency shift of the received data with respect to the carrier frequency. The receiver also includes a second unit to adjust the bandwidth of a channel estimation unit, wherein the adjustment depends on the quantity.

Abstract: A user equipment includes a plurality of antennas to receive downlink signals from a base station, a plurality of receiver circuits each coupled to a respective one of the plurality of antennas to process the received downlink signals, an SIR estimation unit to estimate a quality of the received downlink signals, a power loop controller to generate transmit power control commands based on the estimated quality of the received downlink signals, the transmit power control commands being directed to the base station to adjust a power of the downlink signals and a diversity controller to selectively activate and deactivate one or more of the receiver circuits depending on the estimated quality of the received downlink signals.

Abstract: A receiver includes a plurality of receive antennas configured to receive radio signals from a plurality of transmit antennas, and a plurality of sets of RAKE fingers configured to generate first signals, wherein each set of RAKE fingers is coupled to a respective one of the plurality of receive antennas. The receiver further includes a weighting factor generator configured to generate weighting factors for weighting the first signals, wherein at least one of the weighting factors is generated by using first signals that are generated by at least two of the plurality of sets of RAKE fingers and received from at least two of the plurality of transmit antennas.

Abstract: The invention relates to a transmitter-receiver pair for improved data transmission in a multi-carrier system and to a corresponding method, according to which a chain coding is used. To this end, a transmitter has a first coding stage, a transmission-demultiplexer stage, a second coding stage, a modulator stage, a transmission multiplexer stage and a multi-carrier modulator, whereby said transmission-demultiplexer stage and the transmission multiplexer stage are controlled by a bit loading device. Similarly, the receiver has a multi-carrier demodulator, a receiver demultiplexer stage, a first decoding stage, a receiver multiplexer stage and a second decoding stage, whereby the receiver multiplexer stage and demultiplexer stage are in turn controlled by the bit loading device.

Abstract: A receiver includes an input to receive data of a pilot channel having a carrier frequency associated therewith, and a first unit to obtain a quantity, wherein the quantity depends on a frequency broadening of the received data and a frequency shift of the received data with respect to the carrier frequency. The receiver also includes a second unit to adjust the bandwidth of a channel estimation unit, wherein the adjustment depends on the quantity.

Abstract: The present invention relates to a method for the transmission of data in a multi-carrier system, provided with a frequency band, the carrier frequencies of which are distributed in a sub-carrier band, dividing the frequency band. On the transmission side, dependent on current transmission properties, an adaptive pre-emphasis of the transmission signal is carried out for a part of the carrier frequencies in the sub-carrier band. The transmitter thus has the capacity to determine current transmission properties as well as adaptive pre-emphasis of a part of the carrier frequencies in the sub-carrier band of the transmission signal.

Abstract: The present invention seeks to improve data exchange in a communications system that is especially standardized according to IEEE 802.11a. For this purpose, when the transmission medium, preferably an IEEE 802.11 system with a distributed coordination function (DCF) is accessed in a decentralized manner, pilot signals are transmitted from the transmitter to the recipients using a number of transmission modes and then an allocation table regarding the transmission modes is calculated by the recipient on the basis of the pilot symbols received. The recipient transmits the allocation table to the transmitter so that the subsequent data exchange can proceed on the basis of the allocation table. In the case of centralized access, preferably an IEEE 802.11 system with a point coordination function (PCF), data exchange is improved in that the subsequent data are adaptively modulated already when the allocation table is transmitted.

Abstract: A method for reducing signaling overhead in a multicarrier system with dynamic bit allocation per subcarrier and a corresponding transmitter/receiver device, are provided wherein an established bit allocation table (BAT) that is provided with an index (I) is stored in a BAT storage device (LUT). In order to reduce signaling overhead, only the corresponding index (I) of an existing bit allocation table is transmitted (S6).

Abstract: The invention relates to a transmitter-receiver pair for improved data transmission in a multi-carrier system and to a corresponding method, according to which a chain coding is used. To this end, a transmitter has a first coding stage, a transmission-demultiplexer stage, a second coding stage, a modulator stage, a transmission-multiplexer stage and a multi-carrier modulator, whereby said transmission-demultiplexer stage and the transmission-multiplexer stage are controlled by a bit loading device. Similarly, the receiver has a multi-carrier demodulator, a receiver demultiplexer stage, a first decoding stage, a receiver multiplexer stage and a second decoding stage, whereby the receiver-multiplexer stage and demultiplexer stage are in turn controlled by the bit loading device.

Abstract: A method and OFDM receiver are provided for reducing the influence of harmonic interference on OFDM transmission systems, wherein high interference unity is achieved by the simultaneous use of a window function and a determined item of reliability information, the window function being a Nyquist-shaped window function which generates low side lobes in the subcarrier and interference spectra while simultaneously leaving the orthogonality of the subcarriers unchanged, the determined item of reliability information being derived from a measurement when transmitting a so-called zero symbol, in order to detect the instantaneously active interference signals, with the high interference immunity being achieved when the subcarrier-specific information is taken into account in a so-called Viterbi decoder.

Abstract: A method for changing only one radio channel of an existing duplex radio link is wherein the radio channel changed or to be changed is the disturbed radio channel. The new radio channel (Dn) exhibits, for example in comparison with the disturbed radio channel, only a different timeslot wherein, the radio frequency remains the same.

Abstract: The invention provides that, in the event of a decentrally or centrally organized access to the transmission medium, preferably an IEEE 802.11 system, pilot signals are transmitted from the transmitter to the receiver, and the allocation table is subsequently calculated by the receiver on the basis of the received pilot symbols. The allocation table is transmitted from the receiver to the transmitter so that the subsequent data exchange can take place based on the allocation table.

Abstract: In a cellular telecommunications system using wireless telecommunication between mobile parts and base stations, a method of handing off telecommunications connections from uncoordinated, unlicensed operation of the system to coordinated, licensed operation and vice versa. The method requires only simple circuitry and little energy consumption in the mobile parts. Initial monitoring is carried out in the base station, which supports uncoordinated, unlicensed system operation.

Abstract: Available transfer capacity is apportioned efficiently by stations informing each other of their capacity needs by sending messages when necessary. The sent messages can contain information on priority and capacity requirement. Stations which receive the sent capacity requests release unrequired transfer capacity or transfer capacity which is not urgently required, so that the capacity can by used by a station in need. The corresponding information can also be transferred by other stations, e.g. by several hops.

Abstract: In a radio communications network, transmission time is divided into a succession of frames for conducting data communications with subscriber stations located within a coverage area of two central stations of the network. In a first broadcast phase of each frame, a first central station transmits first frame format information, which defines a first downlink phase of the frame and a first uplink phase. In the same frame, a second central station transmits, on the same frequency, second frame format information, which defines a second downlink phase and a second uplink phase for the communication of subscriber stations with the second central station, whereby the phases with a frame do not overlap.

Abstract: A communication system and associated method are provided, wherein a quality of service is detected in the communication system, coordination reorganization is performed in order to reorganize coordination functionalities for available stations in the communication system, the previous two steps are repeated for various coordination organizations in the communication system, the various qualities of service detected in the various coordination organizations are analyzed, and a coordination organization is selected on the basis of this analysis, whereupon communication is affected with an external communication system which uses the same transmission medium as the communication system.

Abstract: The invention relates to the filtering of a subfrequency band out of a receive frequency band, in which a carrier frequency for prefiltering the receive frequency band and an intermediate frequency for demodulating the frequency band filtered out during the prefiltering and for generating a frequency baseband are inserted into the signal propagation path, in which the desired subfrequency band is filtered out of the frequency baseband by a post-filtering and in which the carrier frequency, the intermediate frequency and the post-filtering are matched to one another.