CALIBRATION METHOD, COMMUNICATION SYSTEM, FREQUENCY CONTROL METHOD, AND COMMUNICATION DEVICE
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Abstract
A calibration method according to the present invention includes a step of first channel estimating for transmitting a pilot signal from a first antenna and receiving the pilot signal at a second antenna different from the first antenna to calculate a first channel estimation value; a step of second channel estimating for transmitting a plot signal from the second antenna and receiving the pilot signal at the first antenna to calculate a second channel estimation value; and a step of correction coefficient calculating for calculating, by using the first and second channel estimation values, a correction coefficient.
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Citations
86 Claims
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1-63. -63. (canceled)
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64. A calibration method used with first and second communication devices that carry out communications in a TDD system to perform calibration on antennas included in the devices, the calibration method comprising:
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a step of first pilot signal transmitting in which the first communication device transmits a pilot signal; a step of first channel estimating in which the second communication device receives the pilot signal transmitted from the first communication device and calculates a first channel estimation value; a step of second pilot signal transmitting in which the second communication device transmits a pilot signal; a step of second channel estimating in which the first communication device receives the pilot signal transmitted from the second communication device and calculates a second channel estimation value; and a step of correction coefficient calculating in which the first communication device calculates a correction coefficient to adjust a signal transmitted and received to and from the second communication device, based on the second channel estimation value and the first channel estimation value obtained from the second communication device. - View Dependent Claims (65, 66)
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67. A communication system comprising:
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a plurality of communication devices that carries out communications in a TDD system, wherein the communication device adaptively selects whether to execute antenna calibration with another communication device by using wireless communications with the another communication device.
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68. A communication system comprising:
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when a communication device A that is one of the plurality of communication devices performs antenna calibration by using wireless communications, the communication device A adaptively selects based on channel state whether the communication device A performs calibration with a communication device C by using wireless communications, or the communication device C performs calibration with a communication device B by using wireless communications.
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69. A communication system comprising:
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a plurality of communication devices that carries out communications, wherein the plurality of communication devices has a function to control a carrier phase so that a carrier phase of a signal received by a reception side communication device is a specific value, before transmitting the signal, and when two or more communication devices in the plurality of communication devices transmit a signal to a single reception side communication device, the communication devices that transmit the signal control the carrier phase of the signal received by the reception side communication device, so as to be a specific relative phase. - View Dependent Claims (70, 71, 72, 73, 74, 75, 76)
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77. A frequency control method used with a first communication device and a second communication device that carry out communications to compensate a frequency difference of signals transmitted from both devices, the frequency control method comprising:
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a step of first pilot signal transmitting in which the first communication device transmits a pilot signal; a step of first channel estimating in which the second communication device receives the pilot signal transmitted from the first communication device and calculates a first channel estimation value; a step of second pilot signal transmitting in which the second communication device transmits a pilot signal whose phase is adjusted based on the first channel estimation value; a step of second channel estimating in which the first communication device receives the pilot signal transmitted from the second communication device and calculates a second channel estimation value; and a step of adjusting in which the first communication device adjusts a frequency of a transmitted signal based on the second channel estimation value. - View Dependent Claims (78, 79, 80, 81)
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82. A frequency control method used with a first communication device and a second communication device that carry out communications to compensate a frequency difference of signals transmitted from both devices, the frequency control method comprising:
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a step of first pilot signal transmitting in which the first communication device transmits a pilot signal; a step of first channel estimating in which the second communication device receives the pilot signal transmitted from the first communication device and calculates a first channel estimation value; a step of second pilot signal transmitting in which the second communication device transmits a pilot signal whose phase is adjusted based on the first channel estimation value; a step of second channel estimating in which the first communication device receives the pilot signal transmitted from the second communication device, calculates a second channel estimation value, and notifies the second channel estimation value to the second communication device; and a step of adjusting in which the second communication device adjusts a frequency of a transmitted signal based on the first channel estimation value and the second channel estimation value. - View Dependent Claims (83, 84, 85, 86)
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Specification