Wireless communication system and method for forming a plurality of directed beams and precoding to adjust the received power at selected receiving apparatuses
First Claim
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1. A transmitting apparatus comprising:
- a plurality of transmission antennas configured to form a plurality of beams respectively directed to a plurality of receiving apparatuses; and
a precoder configured to perform precoding on signals transmitted from the transmission antennas such that received power in third receiving apparatuses, which are the receiving apparatuses excluding a first receiving apparatus serving as a transmission destination of a transmission signal among the receiving apparatuses and two or more second receiving apparatuses among the receiving apparatuses, is equal to or smaller than a threshold, the precoding being performed by excluding transmission line components of the first receiving apparatus and the two or more second receiving apparatuses.
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Abstract
A transmitting apparatus according to the present invention includes transmission antennas capable of forming a plurality of beams respectively directed to a plurality of terminals and a precoder unit that performs precoding on signals transmitted from the transmission antennas such that received power in the terminals excluding a desired terminal serving as a transmission destination of a transmission signal and two or more IUI terminals, which are the terminals other than the desired terminal, is equal to or smaller than a threshold.
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Citations
15 Claims
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1. A transmitting apparatus comprising:
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a plurality of transmission antennas configured to form a plurality of beams respectively directed to a plurality of receiving apparatuses; and a precoder configured to perform precoding on signals transmitted from the transmission antennas such that received power in third receiving apparatuses, which are the receiving apparatuses excluding a first receiving apparatus serving as a transmission destination of a transmission signal among the receiving apparatuses and two or more second receiving apparatuses among the receiving apparatuses, is equal to or smaller than a threshold, the precoding being performed by excluding transmission line components of the first receiving apparatus and the two or more second receiving apparatuses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A control station in a communication system configured to form a plurality of beams respectively directed to a plurality of receiving apparatuses by a plurality of transmission antennas mounted on a plurality of transmitting apparatuses, the control station comprising:
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a precoder calculator configured to calculate a precoding matrix for performing precoding such that received power in third receiving apparatuses, which are the receiving apparatuses excluding a first receiving apparatus serving as a transmission destination of a transmission signal among the receiving apparatuses and two or more second receiving apparatuses among the receiving apparatuses, is equal to or smaller than a threshold, the precoding matrix being calculated based on excluding transmission line components of the first receiving apparatus and the two or more second receiving apparatuses, and a transceiver configured to transmit the precoding matrix to the transmitting apparatuses.
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15. A transmission precoding method in a transmitting apparatus including a plurality of transmission antennas configured to form a plurality of beams respectively directed to a plurality of receiving apparatuses, the transmission precoding method comprising:
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determining a first receiving apparatus, which is the receiving apparatus serving as a transmission destination of a transmission signal, and two or more second receiving apparatuses, which are the receiving apparatuses other than the first receiving apparatus, the precoding matrix being calculated based on excluding transmission line components of the first receiving apparatus and the two or more second receiving apparatuses; and performing precoding on signals transmitted from the transmission antennas such that received power in the receiving apparatuses excluding the first receiving apparatus and excluding the second receiving apparatuses is equal to or smaller than a threshold.
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Specification