Abstract: Embodiments of the claimed subject matter provide a method and apparatus for virtual sectorization using an active antenna array. Embodiments of the apparatus include a transmitter for providing signals to an active antenna array. The signals cause the active antenna array to transmit a first reference signal to a first sector indicated to user equipment within the first sector by a sector identifier. The signals also cause the active antenna array to transmit a plurality of second reference signals into a corresponding plurality of second virtual sectors that overlap the first sector. The apparatus also includes a scheduler for scheduling transmission to user equipment based on feedback generated by the user equipment using the first reference signal or the second reference signals.

Abstract: A communication system comprising a base station and a central office, the base station is used to establish a point-to-multipoint communication to a number of terminal stations and is coupled to the central office. The point-to-multipoint communication provided by that base station is used as a communication link between the central office and the base station.

Abstract: The invention relates notably to a method for controlling the transmitter part of a radio transceiver, the transmitter part comprising an IQ modulator, the radio receiver further comprising a receiver part comprising an IQ demodulator, the radio transceiver being dedicated to transmit modulated information signal over an air interface. According to the invention, the method consists in: storing an IQ modulation vector obtained at IQ modulator and associated to a portion of the information signal; looping the portion of information signal to the receiver part, the information signal having crossed a simulated radio interface between the transmitter part and the receiver part; estimating an error vector by comparing the IQ modulation vector to an IQ demodulation vector obtained by demodulation of the portion of information signal at IQ demodulator; and modifying transmitter part parameters according to the error vector.

Abstract: The invention relates to a method for enhancing the capacity of a cellular radio-communication system, each cell of which comprising a base station and end-users able to communicate with the base station by using a first modulation type over a first communication channel. Any cell experiences an interference level from distant end-users communicating with their corresponding distant base station by using the same first communication channel. According to the invention, the end-users located in at least one domain of the cell in which the interference level is lower than a predefined interference level communicate with the base station by using a second modulation type over a second communication channel, where the second modulation type has a higher efficiency than said first modulation type. The size and location of the domains depend on the antenna directivity of the end-users and on the relative positions of the distant base stations and the base station.

Abstract: The invention relates notably to a method for controlling the transmitter part of a radio transceiver, the transmitter part comprising an IQ modulator, the radio receiver further comprising a receiver part comprising an IQ demodulator, the radio transceiver being dedicated to transmit modulated information signal over an air interface.

Abstract: A system for radio communication with mobile stations, the system being of the type enabling one or more network operators to manage respective distinct networks. Each network is constituted by geographical cells and has mobile stations travelling therethrough. Each cell of a given network is associated with a base station through which those mobile stations that are located in the cell and that are subscribers with the operator managing the given network can communicate. In its own network, each operator transmits a pilot data channel supplying each mobile station with pilot data enabling it specifically to log-on to the network. According to the invention, the system further comprises a super-network made up of geographical super-cells each associated with a super-basestation. Each super-basestation transmits a data signal carrying the pilot data channel of the, or each, operator.

Abstract: Clock recovery arrangement suitable more specifically for an information transmission system using the TDMA principle in one transmission direction.A clock recovery arrangement (24, 13) employed in an information transmission system comprised of a central station (1) and remote stations (2, 3, 4, 5, . . . ). Each station has at least one transmitter circuit (11, 21, 23, 31, 41, 51) and one receiver circuit (12, 20, 22, 30, 40, 50). The information components are time-division muliplexed in the direction from the central station to the remote stations and are transmitted in accordance with the TDMA principle in the other direction. The clock signal H of the multiplex direction is used in the TDMA direction to set the frequency of a first phase-locked loop, while a second loop ensures a fast phase reset. This clock recovery arrangement constituted by this dual loop thus satisfies the requirements as regards precision and reduction of the residual jitter.