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 transmission symbols;
a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols such that the wireless relay system relays signals without interruption;
a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal during a time when the pilot signal is being transmitted; and
a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal,wherein the first wireless station is configured to insert the portion of the transmission symbols to be refrained from relay according to a desired accuracy for estimating a coupling loop interference wave, and an accuracy of the coupling loop interference wave estimated by the coupling loop interference wave estimation part increases as the portion of the transmission symbols to be refrained from relay increases.
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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.
47 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 transmission symbols; a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols such that the wireless relay system relays signals without interruption; a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal during a time when the pilot signal is being transmitted; and a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal, wherein the first wireless station is configured to insert the portion of the transmission symbols to be refrained from relay according to a desired accuracy for estimating a coupling loop interference wave, and an accuracy of the coupling loop interference wave estimated by the coupling loop interference wave estimation part increases as the portion of the transmission symbols to be refrained from relay increases. - 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 transmission symbols; a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols such that the wireless relay apparatus relays signals without interruption; 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 during a time when the pilot signal is being transmitted; and a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal, wherein the portion of the transmission symbols to be refrained from relay is inserted by the first wireless station according to a desired accuracy for estimating a coupling loop interference wave, and an accuracy of the coupling loop interference wave estimated by the coupling loop interference wave estimation part increases as the portion of the transmission symbols refrained to be from relay increases.
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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 transmission symbols inserted by the first wireless station according to a desired accuracy for estimating a coupling loop interference wave; c) transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols such that either the pilot signal or the transmission symbols are transmitted without interruption; d) receiving the pilot signal; e) estimating a coupling loop interference wave based on the pilot signal during a time when the pilot signal is being transmitted, wherein an accuracy of the coupling loop interference wave estimated in step e) increases as the portion of the transmission symbols to be refrained from relay increases; and f) subtracting the estimated coupling loop interference wave from a reception signal.
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Specification