Method, apparatus, and system for microwave signal correction

• US 8,824,589 B2
• Filed: 01/05/2011
• Issued: 09/02/2014
• Est. Priority Date: 11/09/2009
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhao, Guixue
• Primary Examiner(s): Bayard, Emmanuel
• Application Number:
  US12/984,705
• Publication Number:
  US 20110110472A1
• Time in Patent Office: 1,336 Days
• Field of Search: 375295-298, 375278-279, 375284-285
• US Class Current: 375/279
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception
• CPC Class Codes: H04L 27/2064 using microwave technology
• CPC Class Codes: H04L 27/223 Demodulation in the optical domain optical demodulation H04B10/676
• CPC Class Codes: H04L 27/367 using predistortion
• CPC Class Codes: H04L 27/3854 using a non - coherent carrier, including systems with baseband correction for phase or frequency offset

Abstract

A method, an apparatus, and a system are provided in various embodiments of the present invention. According to embodiments of the present invention, the receiver samples the frequency signal from the transmitter to obtain sampling data and obtain the feedback IQ signal from the sampling data, and performs signal correction by using the feedback IQ signal. Sampling the received radio frequency signal does not need an additional component. The receiving channel installed in the receiver can be used to receive the radio frequency signal, which reduces the cost and power consumption.

Claims

1. A method for microwave signal correction performed by a receiver, comprising:

receiving, by the receiver that is a peer device of a transmitter, a first radio frequency (RF) signal from the transmitter;

sampling, by the receiver, the first RF signal to obtain sampling data, and obtaining a feedback IQ signal from the sampling data; and

transmitting, by the receiver, a second RF signal that carries the feedback IQ signal to the transmitter, wherein the feedback IQ signal is used by the transmitter to correct a RF signal transmitted by the transmitter.

2. The method according to claim 1, wherein the transmitter correcting the RF signal transmitted by the transmitter comprises:

obtaining, by the transmitter, an error signal through an error calculation using an original IQ signal and the feedback IQ signal; and

correcting, by the transmitter, the RF signal transmitted by the transmitter by using the error signal.

3. The method according to claim 2, wherein the error signal is used to correct at least one of the following errors introduced by the transmitting channel of the transmitter and the receiving channel of the receiver:

an error of an imbalance of the amplitude and phase of an original IQ signal, a gain error on a channel or a non-linear error.

4. A receiver for microwave signal correction, comprising:

a receiving unit configured to receive a first radio frequency (RF) signal from a transmitter, wherein the receiver is a peer device of the transmitter;

an obtaining unit configured to sample the first RF signal to obtain sampling data, and obtain a feedback IQ signal from the sampling data; and

a transmitting unit configured to transmit a second RF signal that carries the feedback IQ signal to the transmitter, wherein the second RF signal carries the feedback IQ signal is used by the transmitter to correct a RF signal transmitted by the transmitter.

5. A system for microwave signal correction, comprising:

a transmitter configured to transmit a first radio frequency (RF) signal, wherein a microwave frame of the first RF carries an original IQ signal; and

a receiver which is a peer device of the transmitter and is configured to;

receive the first RF signal from the transmitter;

sample the first RF signal to obtain sampling data and obtain a feedback IQ signal from the sampling data;

demodulate the sampling data to restore the microwave frame and obtain the original IQ signal;

obtain an error signal through an error calculation using the original IQ signal and the feedback IQ signal; and

perform a signal correction by using the error signal.

6. The system according to claim 5, wherein the receiver is configured to transmit a second RF signal to the transmitter, wherein a microwave frame of the second RF signal carries the error signal,

wherein the transmitter is configured to perform the signal correction by using the error signal.

7. The system according to claim 5, wherein the error signal is used to correct at least one of the following errors introduced by the transmitting channel of the transmitter and the receiving channel of the receiver:

an error of an imbalance of the amplitude and phase of the original IQ signal, a gain error on a channel or a non-linear error.

8. A system for microwave signal correction, comprising:

a receiver configured to receive a first radio frequency (RF) signal;

sample the first RF signal to obtain sampling data and obtain a feedback IQ signal from the sampling data; and

transmit a second RF signal, wherein the second RF signal carries the feedback IQ signal; and

a transmitter configured to transmit the first RF signal to the receiver, receive the second RF signal from the receiver, and perform a signal correction by using the feedback IQ signal, wherein the receiver is a peer device of the transmitter.

9. The system according to claim 8, wherein

the transmitter is configured to obtain an error signal through an error calculation by using an original IQ signal and the feedback IQ signal and perform the signal correction by using the error signal.

10. The system according to claim 9, wherein the error signal is used to correct at least one of the following errors introduced by the transmitting channel of the transmitter and the receiving channel of the receiver:

an error of an imbalance of the amplitude and phase of an original IQ signal, a gain error on a channel or a non-linear error.

11. A system for microwave signal correction, comprising:

a receiver configured to receive a first radio frequency (RF) signal;

sample the RF signal to obtain sampling data and obtain a feedback IQ signal from the sampling data;

obtain an error signal through an error calculation by using the feedback IQ signal; and

transmit a second RF signal which carries the error signal; and

a transmitter configured to transmit the first RF signal to the receiver, receive the second RF signal from the receiver and correct the second RF signal by using the error signal, wherein the receiver is a peer device of the transmitter.

12. The system according to claim 11, wherein

the receiver is configured to obtain the error signal through the error calculation by using the feedback IQ signal based on a time domain equalization.

13. The system according to claim 11, wherein the error signal is used to correct at least one of the following errors introduced by the transmitting channel of the transmitter and the receiving channel of the receiver:

an error of an imbalance of the amplitude and phase of an original IQ signal, a gain error on a channel or a non-linear error.