Closed loop transmit diversity method and apparatus using complex basis vector sets for antenna selection
First Claim
1. A closed loop transmission antenna diversity method employing a selective combining method when a plurality of antennas are used in a base station of a mobile communication system, the closed loop transmission antenna diversity method comprising the steps of:
- (a) measuring channel information from signals transmitted from the plurality of antennas used in the base station and outputting a channel information matrix;
(b) transforming the channel information matrix according to a transform matrix composed of a complex basis vector set;
(c) calculating reception power with respect to the plurality of antennas based on the transformed channel information matrix; and
(d) transmitting antenna selection information obtained based on the calculated reception power to the base station as feedback information for controlling transmission antenna diversity.
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Abstract
A transmission antenna diversity method, and a base station apparatus and a mobile station apparatus therefor in a mobile communication system are provided. In the transmission antenna diversity method, channel information is measured from signals received through the plurality of antennas used in the base station, and a channel information matrix is output. The channel information matrix is transformed according to a transform matrix composed of a complex basis vector set. Reception power with respect to the plurality of antennas is calculated based on the transformed channel information matrix. Antenna selection information obtained based on the calculated reception power is transmitted to the base station as feedback information for controlling transmission antenna diversity. Therefore, power is equally distributed to transmitting antennas, excellent performance is maintained at a high speed of movement, and reliable channel adaptation is accomplished at a low speed of movement of the mobile station.
130 Citations
19 Claims
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1. A closed loop transmission antenna diversity method employing a selective combining method when a plurality of antennas are used in a base station of a mobile communication system, the closed loop transmission antenna diversity method comprising the steps of:
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(a) measuring channel information from signals transmitted from the plurality of antennas used in the base station and outputting a channel information matrix; (b) transforming the channel information matrix according to a transform matrix composed of a complex basis vector set; (c) calculating reception power with respect to the plurality of antennas based on the transformed channel information matrix; and (d) transmitting antenna selection information obtained based on the calculated reception power to the base station as feedback information for controlling transmission antenna diversity. - View Dependent Claims (2, 3, 4, 5, 6, 16)
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7. A closed loop transmission antenna diversity method employing a selective combining method, comprising the steps of:
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(a) receiving in a base station selection information related to a complex basis vector from a mobile station; (b) determining a complex basis vector selected based on the selection information; (c) obtaining an antenna weight for each antenna using the determined complex basis vector; and (d) generating a signal based on the antenna weight and transmitting the signal to the mobile station through a corresponding antenna. - View Dependent Claims (8, 9, 10, 17)
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11. In a mobile communication system, a base station apparatus, having a plurality of antennas for a closed loop transmission antenna diversity method employing a selective combining method, comprising:
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a plurality of antennas for receiving selection information related to a complex basis vector from a mobile station as feedback information; a feedback information decoder for determining a complex basis vector selected based on the selection information and obtaining an antenna weight for each antenna using the determined complex basis vector; and a data transmitting unit for generating a signal based on the antenna weight and transmitting the signal to the mobile station through a corresponding antenna. - View Dependent Claims (18)
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12. A mobile station apparatus for a closed loop transmission antenna diversity method employing a selective combining method when a plurality of antennas are used in a base station of a mobile communication system, the mobile station apparatus comprising:
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a channel information measuring unit for measuring channel information from signals transmitted through the plurality of antennas used in the base station and outputting a channel information matrix; a basis vector transformer for transforming the channel information matrix according to a transform matrix composed of a complex basis vector set; an optimum weight detector for calculating reception power with respect to the plurality of antennas based on the transformed channel information matrix and generating feedback information for antenna selection based on the calculated reception power; and an uplink signal processor for transmitting the feedback information to the base station in the form of a symbol configured according to a protocol suitable for feedback. - View Dependent Claims (13, 14, 15, 19)
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Specification