Signal Transmission Method, Transmitter, and Signal Transmission System

• US 20150098712A1
• Filed: 12/12/2014
• Published: 04/09/2015
• Est. Priority Date: 06/14/2012
• 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: Wang, Ke, Li, Zhaohui, Cheng, Linghao
• Granted Patent: US 9,520,951 B2
• Time in Patent Office: Days
• US Class Current: 398/182
• CPC Class Codes: H04B 10/0775 Performance monitoring and measurement of transmission parameters
• CPC Class Codes: H04B 10/0779 Monitoring line transmitter or line receiver equipment
• CPC Class Codes: H04B 10/564 Power control
• CPC Class Codes: H04L 25/022 of frequency response

Abstract

Embodiments of the present invention relate to a signal transmission method, transmitter, and signal transmission system. The method includes: obtaining, by a sending end, information about a power fading point of a fiber channel between the sending end and a receiving end; determining, by the sending end and according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, where a frequency of the determined subcarrier is different from that of the power fading point; and sending, by the sending end, a service signal to the receiving end by using the determined subcarrier. According to the embodiments of the present invention, validity of a signal spectrum is ensured, and therefore it is ensured that transmitted data can be effectively recovered at a receiving end.

Claims

1. A signal transmission method comprising:

obtaining, by a sending end, information about a power fading point of a fiber channel between the sending end and a receiving end;

determining, by the sending end and according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, wherein a frequency of the determined subcarrier is different from that of the power fading point; and

sending, by the sending end, a service signal to the receiving end by using the determined subcarrier.

2. The method according to claim 1, wherein the obtaining, by a sending end, information about a power fading point of a fiber channel between the sending end and a receiving end comprises:

obtaining, by the sending end, a frequency domain response of the fiber channel between the sending end and the receiving end; and

determining, by the sending end, the power fading point of the fiber channel according to the frequency domain response.

3. The method according to claim 2, wherein the obtaining, by the sending end, a frequency domain response of the fiber channel between the sending end and the receiving end specifically comprises:

obtaining, by the sending end, a frequency domain response of each of fiber channels with multiple kinds of transmission distances.

4. The method according to claim 3, wherein the determining, by the sending end, the power fading point of the fiber channel according to the frequency domain response specifically comprises:

determining, by the sending end, a power fading point of each fiber channel with a corresponding transmission distance according to a frequency domain response of the fiber channel with the corresponding transmission distance.

5. The method according to claim 1, wherein after the determining a subcarrier that is used to send a service signal to the receiving end on the fiber channel, the method further comprises:

sending, by the sending end, a test signal on determined subcarriers by using at least two kinds of modulation schemes; and

determining, by the sending end and in the determined subcarriers, a subcarrier applicable to each kind of modulation scheme according to a performance indicator, of the test signal, that is corresponding to its respective modulation scheme at the receiving end.

6. A transmitter comprising:

a processor configured to

obtain information about a power fading point of a fiber channel between the transmitter and a receiving end, and

determine, according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, wherein a frequency of the determined subcarrier is different from that of the power fading point; and

a sender configured to send a service signal to the receiving end by using the determined subcarrier.

7. The transmitter according to claim 6, wherein the processor is further configured to obtain a frequency domain response of the fiber channel between the transmitter and the receiving end, and determine the power fading point of the fiber channel according to the frequency domain response.

9. The transmitter according to claim 7, wherein the processor is configured to obtain the power fading point of the fiber channel according to the frequency domain response comprises determining a power fading point of each fiber channel with a corresponding transmission distance according to a frequency domain response of the fiber channel with the corresponding transmission distance.

8. The transmitter according to claim 6, wherein the frequency domain response of the fiber channel comprises a frequency domain response of each of fiber channels with multiple kinds of transmission distances.

10. The transmitter according to claim 6, wherein the sender is further configured to send a test signal on determined subcarriers by using at least two kinds of modulation schemes, and wherein the processor is configured to determine, in the determined subcarriers, a subcarrier applicable to each kind of modulation scheme according to a performance indicator, of the test signal, that is corresponding to its respective modulation scheme at the receiving end.

11. A signal transmission system comprising a transmitter and a receiver, wherein the transmitter comprises:

a processor configured to

obtain information about a power fading point of a fiber channel between the transmitter and a receiving end, and

determine, according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, wherein a frequency of the determined subcarrier is different from that of the power fading point; and

a sender configured to send a service signal to the receiving end by using the determined subcarrier.

12. The signal transmission system according to claim 11, wherein the processor is further configured to obtain a frequency domain response of the fiber channel between the transmitter and the receiving end, and determine the power fading point of the fiber channel according to the frequency domain response.

14. The signal transmission system according to claim 12, wherein the processor determines the power fading point of the fiber channel according to the frequency domain response specifically comprises that:

the processor determines a power fading point of each fiber channel with a corresponding transmission distance according to a frequency domain response of the fiber channel with the corresponding transmission distance.

13. The signal transmission system according to claim 11, wherein the frequency domain response of the fiber channel comprises a frequency domain response of each of fiber channels with multiple kinds of transmission distances.

15. The signal transmission system according to claim 11, wherein the sender is further configured to send a test signal on determined subcarriers by using at least two kinds of modulation schemes, and wherein the processor is configured to determine, in the determined subcarriers, a subcarrier applicable to each kind of modulation scheme according to a performance indicator, of the test signal, that is corresponding to its respective modulation scheme at the receiving end.