Method and system for calibrating a transmitting system

• US 8,665,935 B2
• Filed: 12/06/2006
• Issued: 03/04/2014
• Est. Priority Date: 12/12/2005
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Drescher, Wolfram
• Primary Examiner(s): Liu, Shuwang
• Assistant Examiner(s): HUANG, DAVID S
• Application Number:
  US12/097,096
• Publication Number:
  US 20080298446A1
• Time in Patent Office: 2,645 Days
• Field of Search: 375/224, 455/115.1
• US Class Current: 375/224
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements

Abstract

The invention relates to a method and a system for calibrating a transmitting system (1) for transmitting data from a medium access control device (2) via a digital interface (IF1) to a physical layer (PHY) and an antenna (3) to a transmission line (4), wherein the physical layer (PHY) comprises a base band controller (5) and a data processing pipeline (6) comprising a plurality of functional blocks (FB1 to FB13), comprising the following steps:

• • setting a calibration control register (R),
  • thereupon, setting the transmitting system (1) to a calibration mode, wherein the transmitting system (1) generates a predetermined number of single test tones (T) and transmits the test tones (T) sequentially, and
  • after transmission of the test tones (T), detecting the returned test tones (T) and measuring their levels, especially their power levels and the spectrum behavior of the transmission line (4).

Claims

1. A method for calibrating a transmitting system for transmitting data from a medium access control device via a digital interface to a physical layer and an antenna to a transmission line, wherein the physical layer comprises a base band controller and a data processing pipeline comprising a plurality of functional blocks, comprising the following steps:

setting a calibration control register,

thereupon, setting the transmitting system to a calibration mode based on the setting of the calibration control register, wherein the transmitting system generates a predetermined number of single test tones and transmits the test tones sequentially via the antenna, and

after transmission of the test tones via the antenna, detecting signals that are returned in response to the transmitted test tones and measuring their power levels and the spectrum behaviour of the transmission line, wherein the method comprises initializing a zero frame transmission or a transmission of a frame, whose length is correlated with a tone measurement time length of the single test tone, using the medium access control device.

2. The method according to claim 1, wherein the single test tones are generated with predetermined different frequencies to measure the spectrum behaviour of the transmission line.

3. The method according to claim 1, wherein predetermined pilot tones are used as the single test tones.

4. The method according to claim 1, wherein the measured levels of the signals that are returned in response to the transmitted test tones are used to calibrate the transmission line.

5. The method according to claim 1, wherein the base band controller measures the level of the signals that are returned in response to the transmitted test tones and sets a proper scaling factor for different transmit tones in the transmission line.

6. The method according to claim 1, wherein one of the functional blocks is used as a tone generator.

7. The method according to claim 1, wherein a FFT functional block is adjusted to generate an output signal in a single tone mode.

8. The method according to claim 1, wherein a preamble functional block is set to the calibration mode, where it repeats the transmission of a single frame endlessly.

9. The method according to claim 1, wherein during the calibration mode of the transmitting system, a suffix space insertion is disabled based on the setting of the calibration control register.

10. The method according to claim 9, wherein all tones are suppressed except the actual test tone.

11. A system for calibrating a transmitting system for transmitting data from a medium access control device via a digital interface to a physical layer and an antenna to a transmission line, wherein the physical layer comprises a base band controller and a data processing pipeline comprising a plurality of functional blocks, the system comprising:

a medium access control device configured to set a calibration control register,

a physical layer module; and

an analog front end;

wherein the physical layer module is configured to set a transmitting system to a calibration mode based on the setting of the calibration control register, wherein the transmitting system generates a predetermined number of single test tones and transmits the test tones sequentially via the antenna, and

wherein after transmission of the test tones via the antenna, the transmitting system detects signals that are returned in response to the transmitted test tones and measures their power levels and spectrum behaviour of the transmission line, wherein the medium access control device initializes a zero frame transmission or a transmission of a frame, whose length is correlated with a tone measurement time length of the single test tone.

12. The system according to claim 11, wherein the base band controller measures the level of the signals that are returned in response to the transmitted test tones and sets a proper scaling factor for different transmit tones in the transmission line.

13. The system according to claim 11, wherein one of the functional blocks is used as a tone generator.

14. The system according to claim 11, wherein a FFT functional block is adjusted to generate an output signal in a single tone mode.

15. The system according to claim 11, wherein a preamble functional block is set to the calibration mode, where it repeats the transmission of a single frame endlessly.

16. The system according to claim 11, wherein during the calibration mode of the transmitting system, a suffix space insertion is deactivated based on the setting of the calibration control register.

17. The system according to claim 16, wherein a suffix space insertion functional block suppresses all tones except the actual test tone.

18. A method for calibrating a transmitting system for transmitting data from a medium access control device via a digital interface to a physical layer and an antenna to a transmission line, wherein the physical layer comprises a base band controller and a data processing pipeline comprising a plurality of functional blocks, comprising the following steps:

setting a calibration control register,

thereupon, setting the transmitting system to a calibration mode based on the setting of the calibration control register, wherein the transmitting system generates a predetermined number of single test tones and transmits the test tones sequentially via the antenna, and

after transmission of the test tones via the antenna, detecting signals that are returned in response to the transmitted test tones and measuring their power levels and the spectrum behaviour of the transmission line, wherein during the calibration mode of the transmitting system, a suffix space insertion is disabled based on the setting of the calibration control register.

19. The method of claim 18, wherein all tones are suppressed except the actual test tone.

20. A system for calibrating a transmitting system for transmitting data from a medium access control device via a digital interface to a physical layer and an antenna to a transmission line, wherein the physical layer comprises a base band controller and a data processing pipeline comprising a plurality of functional blocks, the system comprising:

a medium access control device configured to set a calibration control register,

a physical layer module; and

an analog front end;

wherein the physical layer module is configured to set a transmitting system to a calibration mode based on the setting of the calibration control register, wherein the transmitting system generates a predetermined number of single test tones and transmits the test tones sequentially via the antenna, and

wherein after transmission of the test tones via the antenna, the transmitting system detects signals that are returned in response to the transmitted test tones and measures their power levels and spectrum behaviour of the transmission line, wherein during the calibration mode of the transmitting system, a suffix space insertion is deactivated based on the setting of the calibration control register.