Method including a radio transmitter for improving radio link operation
First Claim
1. A method of improving operation of a radio link, the method comprising using an antenna beam directed by an antenna array to establish a radio link, determining the directions of arrival of a received signal, shaping the radiation pattern of a transmitting antenna array on the basis of the directions of arrival of the received signal by selecting a window function which provides the desired radiation pattern of the transmitting antenna array and by implementing the form the window function by means of antenna element specific coefficients.
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Accused Products
Abstract
The invention relates to a method and a system for improving operation of a radio link in a wireless communication system, such as a cellular radio system, by modifying the radiation pattern of an antenna array on the downlink by means of the information obtained from the uplink. The method comprises determining the location of a receiver for transmission by means of an angular power spectrum (400), for example. Then the radiation pattern of a transmitting antenna array is shaped on the basis of the location information on the receiver by selecting a window function which provides the desired radiation pattern and by implementing the form of the window function by means of antenna element specific coefficients (502, 504). (FIG. 5)
14 Citations
42 Claims
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1. A method of improving operation of a radio link, the method comprising
using an antenna beam directed by an antenna array to establish a radio link, determining the directions of arrival of a received signal, shaping the radiation pattern of a transmitting antenna array on the basis of the directions of arrival of the received signal by selecting a window function which provides the desired radiation pattern of the transmitting antenna array and by implementing the form the window function by means of antenna element specific coefficients.
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11. A radio system, which comprises:
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a network part of the radio system, a subscriber terminal and a bi-directional radio link between the network part and the terminal, which is established utilizing an antenna beam directed by an antenna array, and a radio transmitter, comprising means for determining the directions of arrival of a received signal, means for shaping the radiation pattern of a transmitting antenna array on the basis of the directions of arrival of the received signal by selecting a window function which provides the desired radiation pattern and by implementing the form of the window function by means of antenna element specific coefficients. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A radio transmitter comprising
means for determining the directions of arrival of a received signal, means for shaping the radiation pattern of a transmitting antenna array on the basis of the directions of arrival of the received signal by selecting a window function which provides the desired radiation pattern and by implementing the form of the window function by means of antenna element specific coefficients.
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31. A method of improving operation of a radio link, the method comprising
using an antenna beam directed by an antenna array to establish a radio link, locating a receiver, shaping the radiation pattern of the transmitter'"'"'s transmitting antenna array on the basis of the location information on the receiver by defining a number of antenna element specific coefficients which provide the desired width of the main beam as zeros.
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35. A radio system, which comprises:
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a network part of the radio system, a subscriber terminal and a bidirectional radio link between the network part and the terminal, which is established utilizing an antenna beam directed by an antenna array, and a transmitter comprising means for locating a receiver, means for shaping the radiation pattern of the transmitter'"'"'s transmitting antenna array on the basis of the location information on the receiver by defining a number of antenna element specific coefficients which provide the desired width of the main beam as zeros. - View Dependent Claims (36, 37, 38)
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39. A radio transmitter comprising
means for locating a receiver, means for shaping the radiation pattern of the transmitter'"'"'s transmitting antenna array on the basis of the location information on the receiver by defining a number of antenna element specific coefficients which provide the desired width of the main beam as zeros.
Specification