Wireless communication device, wireless communication system, and transmission-data control method
First Claim
1. A wireless communication device comprising:
- an estimating unit that receives a known signal transmitted from a transmission device, and that estimates a channel between the transmission device and the wireless communication device and a reception signal quality;
an identifying unit that identifies a rank of a propagation path based on the channel estimated by the estimating unit;
a first determining unit that determines number of data streams based on the reception signal quality estimated by the estimating unit and the rank identified by the identifying unit;
a second determining unit that determines a precoding matrix based on the reception signal quality estimated by the estimating unit and the number of data streams determined by the first determining unit; and
a transmitting unit that transmits information about the number of data streams determined by the first determining unit and the precoding matrix determined by the second determining unit to the transmission device.
1 Assignment
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Accused Products
Abstract
A reception device includes an estimating unit, a rank identifying unit, a stream-number determining unit, a precoding-matrix determining unit, and a transmitting unit. The estimating unit receives a known signal transmitted from a transmission device, and estimates a channel between the transmission device and the wireless communication device and a reception signal quality. The rank identifying unit identifies a rank of a propagation path based on the estimated channel. The stream-number determining unit determines the number of data streams based on the estimated reception signal quality and the identified rank. The precoding-matrix determining unit determines a precoding matrix based on the estimated reception signal quality and the determined number of data streams. The transmitting unit transmits information relating to the determined number of data streams and the determined precoding matrix to the transmission device.
12 Citations
10 Claims
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1. A wireless communication device comprising:
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an estimating unit that receives a known signal transmitted from a transmission device, and that estimates a channel between the transmission device and the wireless communication device and a reception signal quality; an identifying unit that identifies a rank of a propagation path based on the channel estimated by the estimating unit; a first determining unit that determines number of data streams based on the reception signal quality estimated by the estimating unit and the rank identified by the identifying unit; a second determining unit that determines a precoding matrix based on the reception signal quality estimated by the estimating unit and the number of data streams determined by the first determining unit; and a transmitting unit that transmits information about the number of data streams determined by the first determining unit and the precoding matrix determined by the second determining unit to the transmission device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless communication system comprising:
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a transmission device; and a reception device, wherein the reception device includes; an estimating unit that receives a known signal transmitted from the transmission device, and that estimates a channel between the transmission device and the reception device and a reception signal quality; an identifying unit that identifies a rank based on the channel estimated by the estimating unit; a first determining unit that determines number of data streams based on the reception signal quality estimated by the estimating unit and the rank identified by the identifying unit; a second determining unit that determines a precoding matrix based on the reception signal quality estimated by the estimating unit and the number of data streams determined by the first determining unit; and a transmitting unit that transmits information about the number of data streams determined by the first determining unit and the precoding matrix determined by the second determining unit to the transmission device.
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10. A transmission-data control method performed by a wireless communication device, the transmission-data control method comprising:
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receiving a known signal transmitted from a transmission device; estimating a channel between the transmission device and the wireless communication device and a reception signal quality; identifying a rank based on the estimated channel; determining number of data streams based on the estimated reception signal quality and the identified rank; determining a precoding matrix based on the estimated reception signal quality and the determined number of data streams; and transmitting information about the determined number of data streams and the determined precoding matrix to the transmission device.
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Specification