Nokia Corporation

Nokia Telecommunications Oy

Jorma Pallonen

Kauko Heinikoski

Murat Emre Ermutlu

Marko Johannes Leukkunen

A switch is particularly advantageous for calibration of signal phase between transmitters, and other uses. The switch has a first data input adapted to input a transmit signal from a first transmitter, a first data output, at least one and preferably multiple bidirectional data ports, and a control input adapted to selectively couple in a first case the first data input to one of the bidirectional data ports, and in a second case one of the bidirectional data ports and the first data input to the first data output. By coupling one data port of the switch to a data port of another identical switch, a transmit signal from another transmitter can be ported to the first said switch, and both signals output to a feedback circuit that finds the phase difference and applies it to a new signal input to one of the transmitters. Beamforming and MIMO uses are also detailed.

Phase and power calibration in active antennas

The present invention relates to a base station of a cellular radio system, which base station comprises antenna equipment for receiving signals from a certain mobile station simultaneously by at least two antenna beams directed in different directions, and measuring equipment for measuring the signal levels of the signals received by the respective antenna beans. For determining the position of the mobile station with greater accuracy the base station is provided with calculating means which are responsive to the measuring equipment to determine the direction from the base station to the mobile station by calculating the relations between the signal levels of the signals for the respective beams.

Method for determining the position of a mobile station

The present invention relates to a base station of a radio system whose antenna means ( ) include: means ( to ) for receiving signals associated with the same logical channel by at least two antenna beams ( to ), measuring means ( ) for measuring the signal level of the signals received by the antenna beams, and control means ( ) for selecting one or more antenna beams ( to ) and for supplying the signals of the selected antenna beam to a receiver unit ( ) of the base station (BTS1). In order that the best possible signal would be definitely transmitted to the base station, the base station (BTS1) comprises means for measuring the quality of the signals and for generating a quality signal (BER) and for supplying it to the control means ( ), and the control means ( ) are arranged to select an antenna beam ( to ) on the basis of the signal level measured by the measuring means and the quality signal (BER) supplied to the control means.

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Helsinki, Finland

Jorma Pallonen