Data transmission method in base station of radio system, base station of radio system, and antenna array of base station
AssigneeNokia Corporation
InventorJuha Ylitalo
Life of this patent
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Abstract
The invention relates to a method and a base station of a radio system implementing the method and to an antenna array of the base station which enable both antenna diversity and beam forming using the same antenna array. In the solution described the antenna array comprises, in addition to a linear part configured for beam forming, a non-linear part which is used for forming diversity. Furthermore, the non-linear part enlarges the aperture of the antenna array, thus improving the quality of beam forming.
Claims15
A data transmission method in a base station of a radio system, the method comprising performing the following steps in the same base station:
- forming an antenna diversity mode using at least one antenna element of a linear part of a compact antenna array and at least one antenna element of a non-linear part;
- performing a transition between a beam-forming mode and the antenna diversity mode of the base station by selecting a suitable weight matrix from several weight matrices according to the capacity requirement of the base station, and
- forming the beam-forming mode using at least one antenna element of the linear part of the compact antenna array used in the formation of the antenna diversity mode and another antenna element of the linear part and by weighting the antenna elements with the suitable weight matrix.
A base station of a radio system, comprising:
- a compact antenna array for implementing a radio interface of the base station;
- the compact antenna array including a linear part and a non-linear part;
- the linear part including at least two antenna elements for transmitting and receiving signals;
- the non-linear part including at least one antenna element for transmitting and receiving signals;
- weighting means for weighting signals of the antenna elements;
- the linear part, non-linear part and weighting means being arranged to form a beam-forming mode of the base station with pre-determined weight matrix;
- the linear part, non-linear part and weighting means being further arranged to form a diversity mode of the base station, and
- wherein the weighting means are arranged to perform a transition from the antenna diversity mode to the beam-forming mode of the base station by selecting a suitable weight matrix from several weight matrices according to the capacity requirement of the base station.
Dependencies are inferred from the claim text.