Method and apparatus for adjusting pre-distortion coefficient

• US 9,479,368 B2
• Filed: 05/27/2014
• Issued: 10/25/2016
• Est. Priority Date: 11/28/2011
• 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: Ma, Xinyue, Xue, Wei, Wang, Tianxiang, Deng, Xiangdong
• Primary Examiner(s): Washburn, Daniel
• Assistant Examiner(s): Hassan, Sarah
• Application Number:
  US14/288,151
• Publication Number:
  US 20140269973A1
• Time in Patent Office: 882 Days
• Field of Search: 370/290, 381/66
• US Class Current: 1/1
• CPC Class Codes: H03F 1/3241 using predistortion circuits H03F1/3211, H03F1/3217 take precedence
• CPC Class Codes: H03F 1/3247 using feedback acting on predistortion circuits H03F1/3264 takes precedence
• CPC Class Codes: H03F 1/3258 based on polynomial terms
• CPC Class Codes: H03F 3/195 in integrated circuits
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 2001/0425 with linearisation using predistortion
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04L 25/08 Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 27/368 adaptive predistortion

Abstract

A pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end is adjusted. A signal received quality report which is obtained according to the pre-distortion coefficient before adjustment is analyzed and fed back by a receiving end and a signal received quality report that is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end. The analysis determines a variation situation of signal received quality of the receiving end. If the signal received quality of the receiving end becomes better, the pre-distortion coefficient after adjustment is used as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end. The process then returns to the step of adjusting a pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end.

Claims

1. A method for adjusting a pre-distortion coefficient, the method comprising:

adjusting a pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by N adjustment steps, wherein N is an assumed number of increase times of the transmit power;

analyzing a signal received quality report that is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, the analyzing determining whether a signal received quality of the receiving end becomes better or worse;

if the signal received quality of the receiving end becomes better, using the pre-distortion coefficient after adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then returning to the step of adjusting the pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end; and

if the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end;

wherein, before adjusting the pre-distortion coefficient, the method further comprises;

adopting the pre-distortion coefficient before adjustment to perform pre-distortion processing for a baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal that is generated according to the pre-distortion coefficient after adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end;

wherein, after adjusting the pre-distortion coefficient, the method further comprises;

adopting the pre-distortion coefficient after adjustment to perform pre-distortion processing for the baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal that is generated according to the pre-distortion coefficient before adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end.

2. The method according to claim 1, wherein, when the pre-distortion coefficient before adjustment is used as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, a correspondence is established between a current temperature value and the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end.

3. The method according to claim 1, wherein, before a step of adjusting the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step, the method further comprises:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

if a variation situation is that the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then instructing to execute the step of adjusting the transmit power currently set by the transmitting end to be the pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.

4. The method according to claim 1, wherein, before a step of adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step, the method further comprises:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

if the signal received quality of the receiving end becomes worse, instructing to execute the step of adjusting the transmit power currently set by the transmitting end to be the pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step.

5. A method for adjusting a pre-distortion coefficient, the method comprising:

adjusting the pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end to be a pre-distortion coefficient corresponding to a transmit power which is assumed to be decreased by N adjustment steps, wherein N is an assumed number of decrease times of the transmit power;

analyzing a signal received quality report that is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, the analyzing determining whether a signal received quality of the receiving end becomes better or worse;

if the signal received quality of the receiving end becomes better, using the pre-distortion coefficient after adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then returning to the step of adjusting the pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end; and

if the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end;

wherein, before adjusting the pre-distortion coefficient, the method further comprises;

adopting the pre-distortion coefficient before adjustment to perform pre-distortion processing for a baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal that is generated according to the pre-distortion coefficient after adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end; and

wherein after adjusting the pre-distortion coefficient, the method further comprises;

adopting the pre-distortion coefficient after adjustment to perform pre-distortion processing for the baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal that is generated according to the pre-distortion coefficient before adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end.

6. The method according to claim 5, wherein, before a step of adjusting the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step, the method further comprises:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

if the variation situation is that the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then instructing to execute the step of adjusting the transmit power currently set by the transmitting end to be the pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.

7. The method according to claim 5, wherein, before a step of adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step, the method further comprises:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

if the signal received quality of the receiving end becomes worse, instructing to execute the step of adjusting the transmit power currently set by the transmitting end to be the pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by one adjustment step.

13. The method according to claim 5, wherein, when the pre-distortion coefficient before adjustment is used as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, a correspondence is established between a current temperature value and the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end.

8. An apparatus comprising:

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for;

adjusting a pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by N adjustment steps, wherein N is an assumed number of increase times of the transmit power;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end;

when the signal received quality of the receiving end becomes better, using the pre-distortion coefficient after adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then repeating the step of adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end;

when the received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end;

adopting the pre-distortion coefficient before adjustment to perform pre-distortion processing for a baseband signal, to generate a pre-distorted baseband signal; and

converting the pre-distorted baseband signal which is generated according to the pre-distortion coefficient before adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end;

receiving the signal received quality report fed back by the receiving end;

adopting the pre-distortion coefficient after adjustment to perform pre-distortion processing for the baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal which is generated according to the pre-distortion coefficient after adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end.

9. The apparatus according to claim 8, wherein the program includes further instructions for, when the pre-distortion coefficient before adjustment is used as the pre-distortion coefficient corresponding to the currently set transmit power, establishing a correspondence between a current temperature value and the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end.

11. The apparatus according to claim 8, wherein the program includes further instructions for:

adjusting module the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

when the variation situation is that the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then repeating the adjusting to adjust the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.

12. The apparatus according to claim 8, wherein the program includes further instructions for:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

when the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the currently set transmit power, and then repeating adjustment of the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.

10. An apparatus comprising:

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for;

adjusting a pre-distortion coefficient corresponding to a transmit power currently set by a transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be decreased by N adjustment steps, wherein N is a number of decrease times of the transmit power;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end;

when the signal received quality of the receiving end becomes better, using the pre-distortion coefficient after adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then repeating the adjusting continue to adjust the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end; and

when the received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end;

adopting the pre-distortion coefficient before adjustment to perform pre-distortion processing for a baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal which is generated according to the pre-distortion coefficient before adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end;

receiving the signal received quality report fed back by the receiving end;

adopting the pre-distortion coefficient after adjustment to perform pre-distortion processing for the baseband signal, to generate a pre-distorted baseband signal;

converting the pre-distorted baseband signal which is generated according to the pre-distortion coefficient after adjustment into a radio-frequency signal;

transmitting the converted signal to the receiving end; and

receiving the signal received quality report fed back by the receiving end.

14. The apparatus according to claim 10, wherein the program includes instructions for, when the pre-distortion coefficient before adjustment is used as the pre-distortion coefficient corresponding to the currently set transmit power, establishing a correspondence between a current temperature value and the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end.

15. The apparatus according to claim 10, wherein the program includes instructions for:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

when the variation situation is that the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end, and then repeating the adjusting to adjust the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.

16. The apparatus according to claim 10, wherein the program includes instructions for:

adjusting the pre-distortion coefficient corresponding to the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is decreased by one adjustment step;

analyzing a signal received quality report which is obtained according to the pre-distortion coefficient before adjustment and fed back by a receiving end and a signal received quality report which is obtained according to the pre-distortion coefficient after adjustment and fed back by the receiving end, to determine a variation situation of signal received quality of the receiving end; and

when the signal received quality of the receiving end becomes worse, using the pre-distortion coefficient before adjustment as the pre-distortion coefficient corresponding to the currently set transmit power, and then repeating the adjusting to adjust the transmit power currently set by the transmitting end to be a pre-distortion coefficient corresponding to the transmit power which is assumed to be increased by one adjustment step.