Multiple antenna system
First Claim
1. A multiple-antenna system including a base station apparatus and a plurality of antenna apparatuses connected to the base station via optical cables, the system comprising:
- a first antenna apparatus and a second antenna apparatus connected to each other via an electric cable, each of the first and second antenna apparatuses receiving a reference pulse from the base station apparatus via the optical cables and estimating a time difference between the received reference pulse and the reference pulse supplied from the counterpart antenna apparatus via the electric cable, at least one of the first and second antenna apparatuses adjusting signal transmission timing based on the time differences estimated by the first and second antenna apparatuses.
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Accused Products
Abstract
A multiple-antenna system including a base station apparatus and a plurality of antenna apparatuses connected to the base station via optical cables is provided. The system comprises a first antenna apparatus and a second antenna apparatus connected to each other via an electric cable. Each of the first and second antenna apparatuses receives a reference pulse from the base station apparatus via the optical cables, and estimates a time difference between the received pulse and the reference pulse supplied from the counterpart antenna apparatus via the electric cable. At least one of the first and second antenna apparatuses adjusts signal transmission timing based on the time differences estimated by the first and second antenna apparatuses.
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Citations
9 Claims
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1. A multiple-antenna system including a base station apparatus and a plurality of antenna apparatuses connected to the base station via optical cables, the system comprising:
a first antenna apparatus and a second antenna apparatus connected to each other via an electric cable, each of the first and second antenna apparatuses receiving a reference pulse from the base station apparatus via the optical cables and estimating a time difference between the received reference pulse and the reference pulse supplied from the counterpart antenna apparatus via the electric cable, at least one of the first and second antenna apparatuses adjusting signal transmission timing based on the time differences estimated by the first and second antenna apparatuses. - View Dependent Claims (2, 3)
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4. A base station apparatus used in a multiple antenna system that includes a plurality of antenna apparatuses connected to the base station via optical cables, the base station apparatus comprising:
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a delay control unit configured to cause a reference pulse to be transmitted from the base station apparatus to each of the antenna apparatuses; a timer configured to measure a time required to receive the reference pulse returned from said each of the antenna apparatuses; a delay detecting unit configured to determine a delay time of said each of the antenna apparatuses based on the measure time, wherein a first antenna apparatus and a second antenna apparatus are connected to each other via an electric cable, each of the first and second antenna apparatuses receiving a reference pulse from the base station apparatus via the optical cables and estimating a time difference between the received reference pulse and the reference pulse supplied from the counterpart antenna apparatus via the electric cable, at least one of the first and second antenna apparatuses adjusting signal transmission timing based on the time differences estimated by the first and second antenna apparatuses. - View Dependent Claims (5, 6, 7)
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8. An antenna apparatus used in a multiple antenna system that includes a base station apparatus and a plurality of antenna apparatuses connected to the base station apparatus via optical cables, the antenna apparatus comprising:
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a time mark receiving unit configured to receive a time mark as a first received pulse from the base station via one of the optical cables; a time difference estimating unit configured to estimate a first time difference between the first received pulse and a second received pulse supplied from a second antenna apparatus via an electric cable; and a phase difference control unit configured to cause transmission timing to be controlled based on the first time difference and a second time difference supplied from the second antenna apparatus via the electric cable.
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9. A multiple antenna system including a base station apparatus and a plurality of antenna apparatuses connected to the base station apparatus via optical cables, each of the antenna apparatuses being arranged in one of a plurality of sectors, wherein:
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at least one of the antenna apparatuses comprises multiple antenna elements for performing an antenna diversity technique, a serial-to-parallel converter connected to the antenna elements, and an optical-to-electric converter connected to the serial-to-parallel converter; and the base station apparatus comprises a baseband processing unit configured to perform baseband processing in common for the antenna apparatuses, and a plurality of electric-to-optical converters connected to the baseband processing unit via parallel-to-serial converters, wherein a first antenna apparatus and a second antenna apparatus are connected to each other via an electric cable, each of the first and second antenna apparatuses receiving a reference pulse from the base station apparatus via the optical cables and estimating a time difference between the received reference pulse and the reference pulse supplied from the counterpart antenna apparatus via the electric cable, at least one of the first and second antenna apparatuses adjusting signal transmission timing based on the time differences estimated by the first and second antenna apparatuses.
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Specification