Abstract: The invention relates to a method of implementing macrodiversity in a cellular radio network having in each cell at least one base station which communicates with subscriber terminals within its area. Packet switched connections are provided between the base station and the terminals, the connections comprising an actual traffic channel and a separate control channel. In signal transmission, the terminals use IQ modulation in which the traffic and control channels are multiplexed to be transmitted on different branches, and the terminals can communicate with more than one base station simultaneously. To enable macrodiversity in packet switched connections, the actual traffic channel connection is also maintained between the terminal and only one base station, and the control channel connection is maintained between the terminal and more than one base station simultaneously.

Abstract: The invention relates to a method and a radio system for transmitting a digital signal. The method comprises the following steps: the transmitter transmits at least a part of the signal via at least two different transmit antenna paths; the transmitter weights the transmit power of the signals to be transmitted via the different transmit antenna paths with respect to one another by means of changeable weighting coefficients determined for each transmit antenna path; the receiver receives the signal.

Abstract: The invention relates to a transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, wherein a transmission signal is transmitted from the transmitting element to the at least one receiver in accordance with a weight information determined in response to a feedback information. The feedback information is derived from the response at the at least one receiver to the transmission signal, and is fed back using multiplexed feedback signals. Alternatively, the weight information may be determined at the transmitting element by filtering said feedback information and quantizing the filtered feedback information to a desired quantization constellation. Thus, multiple quantization constellations and combinations thereof and/or constellation specific feedback subchannels can be used for channel probing, such that the total feedback resolution can be enhanced, while maintaining low signaling capacity of the feedback channel.

Abstract: The present invention is based on the idea that the base transceiver station can make a decision as to changing transmission diversity in response to the power control message sent by the mobile station. The decision to change transmission diversity is made, for instance, on the basis of the result obtained from filtering the power control requests. For example, filtering can be carried out using a sliding window that contains power control information on the basis of which the decision is made. It is not necessary for the mobile station to transmit a special request to change transmission diversity; instead, the decision on changing transmission diversity is made by the base transceiver station in response to the power control information that the mobile station would, in any case, send to the base transceiver station.

Abstract: The invention relates to a transmitting and receiving method and a radio system. In a transmitter the signals to be transmitted are spread coded in means and modulated by subcarriers in means. In a receiver (R) the signals are demodulated in means and submitted to multiuser detection in means by using the subcarriers to limit the number of detectable signals in the means. The receiver uses multiuser detection for reducing multiple access interference and correcting frequency-selective fading.