Wireless relay system, wireless relay apparatus, and wireless relay method
First Claim
1. A wireless relay system for relaying a radio signal transmitted from a first wireless station to a second wireless station via a wireless relay apparatus, the wireless relay system comprising:
- a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols;
a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols;
a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal; and
a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal.
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Accused Products
Abstract
A wireless relay system for relaying a radio signal transmitted from a first wireless station to a second wireless station via a wireless relay apparatus is disclosed. The wireless relay system includes a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols, a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols, a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal, and a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal.
89 Citations
11 Claims
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1. A wireless relay system for relaying a radio signal transmitted from a first wireless station to a second wireless station via a wireless relay apparatus, the wireless relay system comprising:
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a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols;
a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols;
a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal; and
a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless relay apparatus for relaying a radio signal transmitted from a first wireless station to a second wireless station, the wireless relay apparatus comprising:
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a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols;
a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols;
a coupling loop interference wave estimation part for receiving the pilot signal and estimating a channel impulse response of coupling loop interference wave based on the pilot signal; and
a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal.
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11. A wireless relay method for relaying a radio signal transmitted from a first wireless station to a second wireless station, the wireless relay method comprising the steps of:
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a) receiving transmission symbols transmitted from the first wireless station;
b) refraining from relaying a portion of the symbols;
c) transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols;
d) receiving the pilot signal;
e) estimating a coupling loop interference wave based on the pilot signal; and
f) subtracting the estimated coupling loop interference wave from a reception signal.
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Specification