Determining signal direction in radio system
First Claim
1. A method of determining a signal direction in a radio system, the method comprising receiving a signal transmitted by a first transceiver by at least two antenna elements of an antenna array of a second transceiver, the antenna elements being used to form at least two receiving beams with different directions;
- determining signal power values in at least two different receiving beams and a preliminary direction of arrival for the received signal as properties of the received signal, the method further comprising determining a variable describing the angular speed of the first transceiver in relation to the second transceiver;
performing averaging filtering on at least one of the determined properties and changing at least one parameter of the averaging filtering according to the variable describing the angular speed of the first transceiver; and
determining the direction of the received signal utilizing at least one property filtered with averaging filtering.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to determining the direction of a received signal in a radio system. A variable describing the angular speed of a terminal (402) in relation to a base station (400) is determined in the radio system. An estimator of the base station performs averaging filtering on the power of a received signal, on the receiving direction or on both. Information on the variable describing the angular speed of the terminal (402) is fed into the estimator, which changes at least one parameter of averaging filtering according to the variable describing the angular speed of the terminal (402). The estimator determines the direction of the received signal utilizing the signal power or receiving direction filtered with averaging filtering or both.
-
Citations
32 Claims
-
1. A method of determining a signal direction in a radio system, the method comprising receiving a signal transmitted by a first transceiver by at least two antenna elements of an antenna array of a second transceiver, the antenna elements being used to form at least two receiving beams with different directions;
- determining signal power values in at least two different receiving beams and a preliminary direction of arrival for the received signal as properties of the received signal, the method further comprising
determining a variable describing the angular speed of the first transceiver in relation to the second transceiver;
performing averaging filtering on at least one of the determined properties and changing at least one parameter of the averaging filtering according to the variable describing the angular speed of the first transceiver; and
determining the direction of the received signal utilizing at least one property filtered with averaging filtering. - View Dependent Claims (8, 9, 10, 11, 12, 15, 16)
- determining signal power values in at least two different receiving beams and a preliminary direction of arrival for the received signal as properties of the received signal, the method further comprising
-
2. A method of directing a receiving beam, the method comprising receiving a signal transmitted by a first transceiver by at least two antenna elements of an antenna array of a second transceiver, the antenna elements being used to form at least two receiving beams with different directions;
- determining signal power values in at least two different receiving beams and a preliminary direction for arrival of the received signal as properties of the received signal, the method further comprising
determining a variable describing the angular speed of the first transceiver in relation to the second transceiver;
performing averaging filtering on at least one of the determined properties, and changing at least one parameter of the averaging filtering according to the variable describing the angular speed of the first transceiver;
determining the direction of the received signal utilizing at least one property filtered with averaging filtering; and
directing at least one receiving beam of the second transceiver by means of the determined direction of arrival. - View Dependent Claims (3, 4, 13)
- determining signal power values in at least two different receiving beams and a preliminary direction for arrival of the received signal as properties of the received signal, the method further comprising
-
5. A method of directing a transmitting beam, the method comprising receiving a signal transmitted by a first transceiver by at least two antenna elements of an antenna array of a second transceiver, the antenna elements being used to form at least two receiving beams with different directions;
- determining signal power values in at least two different receiving beams and a preliminary direction of arrival for the received signal as properties of the received signal, the method further comprising
determining a variable describing the angular speed of the first transceiver in relation to the second transceiver;
performing averaging filtering on at least one of the determined properties and changing at least one parameter of averaging filtering according to the variable describing the angular speed of the first transceiver;
determining the direction of the received signal utilizing at least one property filtered with averaging filtering; and
directing at least one transmitting beam of the second transceiver by means of the determined direction of arrival. - View Dependent Claims (6, 7, 14)
- determining signal power values in at least two different receiving beams and a preliminary direction of arrival for the received signal as properties of the received signal, the method further comprising
-
17. A radio system which comprises at least one base station and several terminals, the base station comprises an antenna array which comprises at least two antenna elements, which are arranged to form at least two receiving beams with different directions;
- the terminal is arranged to function as a transmitter of a signal used in direction determination, and the base station is arranged to function as a receiver of the direction determining signal and receive, using an antenna array, a signal transmitted by the terminal and used in direction determination and, using the antenna array'"'"'s receiving beams with different directions, determine signal power values in at least two different receiving beams and a preliminary direction of arrival of the signal as properties of the received direction determining signal, wherein
the radio system is arranged to determine a variable describing the angular speed of the terminal in relation to the base station;
the radio system comprises an estimator which performs averaging filtering on at least one of the determined properties;
the estimator is arranged to receive information on the variable describing the angular speed of the terminal; and
the estimator is arranged to change at least one parameter of averaging filtering according to the variable describing the angular speed of the terminal; and
the estimator is arranged to determine the direction of the received signal utilizing at least one property filtered with averaging filtering. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
- the terminal is arranged to function as a transmitter of a signal used in direction determination, and the base station is arranged to function as a receiver of the direction determining signal and receive, using an antenna array, a signal transmitted by the terminal and used in direction determination and, using the antenna array'"'"'s receiving beams with different directions, determine signal power values in at least two different receiving beams and a preliminary direction of arrival of the signal as properties of the received direction determining signal, wherein
Specification