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US 10,382,189 B2Granted
Method, apparatus and system for multi-carrier OFDM duplex transmission
AssigneeHuawei Technologies Co., Ltd.
InventorCao Shi
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Abstract
Embodiments of the present invention provide a method, an apparatus, and a system for multi-carrier OFDM duplex transmission, and relate to the communications field, so as to solve the problem where spectrum duplex transmission cannot be normally performed due to interference that is generated by an echo signal transmitted by using an OFDM technology. The method for multi-carrier OFDM duplex transmission includes: performing, on at least one OFDM subcarrier channel, sending and receiving of a near-end OFDM signal; obtaining a carrier phase difference between a near-end echo OFDM signal and a far-end OFDM signal; and performing a phase adjustment for the near-end OFDM signal according to the carrier phase difference.
Claims20
A method for multi-carrier orthogonal frequency division multiplexing (OFDM) duplex transmission, the method comprising:
- simultaneously performing, by a near-end device, on a first OFDM subcarrier channel, sending of a near-end OFDM signal and receiving of a far-end OFDM signal sent from a far-end device;
- calculating a carrier phase difference value between a near-end echo OFDM signal and the far-end OFDM signal according to the near-end echo OFDM signal generated from the sent near-end OFDM signal and according to the received far-end OFDM signal, wherein the near-end echo OFDM signal generated from the sent near-end OFDM signal comprises a signal that returns to the near-end device when the near-end OFDM signal is sent by the near-end device;
- and
- synchronizing a carrier phase of the near-end echo OFDM signal with a carrier phase of the far-end OFDM signal using the calculated carrier phase difference value;
- wherein the synchronizing comprises:
- performing a carrier phase adjustment for the near-end OFDM signal according to the carrier phase difference value;
- or
- sending the carrier phase difference value to the far-end device by using a carrier phase difference notification message, wherein the far-end device performs a carrier phase adjustment for the far-end OFDM signal according to the carrier phase difference value.
5 more elements
An apparatus for multi-carrier orthogonal frequency division multiplexing (OFDM) duplex transmission, comprising:
- a sender configured to perform, on a first OFDM subcarrier channel, sending of a near-end OFDM signal;
- a receiver configured to perform, on the first OFDM subcarrier channel, receiving of a far-end OFDM signal sent from a far-end device;
- a first phase detector configured to mix the near-end OFDM signal and a near-end reference OFDM signal to obtain a first carrier phase difference value between the near-end OFDM signal and the near-end reference OFDM signal;
- a first additive mixer coupled to the first phase detector and configured to add the first carrier phase difference value and a second carrier phase difference value to obtain a carrier phase deviation for which a carrier phase adjustment is to be performed, wherein the second carrier phase difference value is between a near-end echo OFDM signal generated from the sent near-end OFDM signal and the far-end OFDM signal, and wherein the near-end echo OFDM signal generated from the sent near-end OFDM signal comprises a signal that returns to the apparatus when the near-end OFDM signal is sent by the sender;
- and
- a voltage-controlled oscillator coupled to the first phase detector and configured to perform the carrier phase adjustment for the near-end OFDM signal using the carrier phase deviation, wherein after the carrier phase adjustment of the near-end OFDM signal a carrier phase of the near-end echo OFDM signal is synchronized with a carrier phase of the far-end OFDM signal.
3 more elements
A system for multi-carrier orthogonal frequency division multiplexing (OFDM) duplex transmission, the system comprising:
- a near-end apparatus, wherein the near-end apparatus comprises a sender, a receiver, a first phase detector, a first additive mixer, a first voltage-controlled oscillator, and a message transmitter, wherein:
- the sender is configured to perform, on a first OFDM subcarrier channel, sending of a near-end OFDM signal;
- the receiver is configured to perform, on the first OFDM subcarrier channel, receiving of a far-end OFDM signal sent from a far-end apparatus;
- the first phase detector is configured to mix the near-end OFDM signal and a near-end reference OFDM signal to obtain a first carrier phase difference value between the near-end OFDM signal and the near-end reference OFDM signal;
- the first additive mixer is configured to add the first carrier phase difference value and a second carrier phase difference value to obtain a carrier phase deviation for which a carrier phase adjustment is to be performed, wherein the second carrier phase difference value is between a near-end echo OFDM signal generated from the sent near-end OFDM signal and the far-end OFDM signal, and wherein the near-end echo OFDM signal generated from the sent near-end OFDM signal comprises a signal that returns to the near-end apparatus when the near-end OFDM signal is sent by the near-end apparatus;
- the first voltage-controlled oscillator is configured to perform the carrier phase adjustment for the near-end OFDM signal using the carrier phase deviation, wherein performing the carrier phase adjustment of the near-end OFDM signal causes a carrier phase of the near-end echo OFDM signal to be synchronized with a carrier phase of the far-end OFDM signal;
- and
- the message transmitter is configured for the near-end apparatus to send the second carrier phase difference value to the far-end apparatus by using a carrier phase difference notification message, wherein the far-end apparatus performs a carrier phase adjustment for the far-end OFDM signal according to the second carrier phase difference value between the near-end echo OFDM signal and the far-end OFDM signal, for synchronizing carrier phases of the near-end echo OFDM signal and the far-end OFDM signal;
- and
- a far-end apparatus comprising:
- a second voltage-controlled oscillator configured to perform a carrier phase adjustment for the far-end OFDM signal after obtaining the carrier phase difference notification message sent by the near-end apparatus, for synchronizing the carrier phases of the near-end echo OFDM signal and the far-end OFDM signal.
8 more elements
Dependencies are inferred from the claim text.