Transmitter and transmission method

• US 20060067425A1
• Filed: 08/24/2005
• Published: 03/30/2006
• Est. Priority Date: 09/24/2004
• Status: Abandoned Application

• Current Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Windisch, Marcus
• Application Number:
  US11/209,670
• Publication Number:
  US 20060067425A1
• Time in Patent Office: Days
• US Class Current: 375/296
• CPC Class Codes: H03F 1/3241 using predistortion circuits H03F1/3211, H03F1/3217 take precedence
• 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

Abstract

The invention relates to a transmitter comprising: means for generating an intermediate frequency signal, means for predistortion of the intermediate frequency signal using a predistortion parameter, means for generating a radio frequency signal from the predistorted intermediate frequency signal, means for determining an image-to-signal-ratio of the radio frequency signal, means for adaptation of the predistortion parameter for reduction of the image-to-signal-ratio.

Claims

1. A transmitter comprising:

means for generating an intermediate frequency signal,

means for predistortion of the intermediate frequency signal using a predistortion parameter,

means for generating a radio frequency signal from the predistorted intermediate frequency signal,

means for determining an image-to-signal-ratio of the radio frequency signal,

means for adaptation of the predistortion parameter for reduction of the image-to-signal-ratio.

2. The transmitter of claim 1, the means for adaptation of the predistortion parameter being operable to perform an iterative algorithm for adaptation of the predistortion parameters.

3. The transmitter of claim 1, the means for adaptation of the predistortion parameter being operable to use a cost function to perform the adaptation.

11. A telecommunication device, such as a base station or a mobile terminal, for use in a digital telecommunication network, the telecommunication device comprising a transmitter in accordance with claim 1.

4. A transmission method comprising:

generating an intermediate frequency signal,

predistortion of the intermediate frequency signal using a predistortion parameter,

generating a radio frequency signal from the predistorted intermediate frequency signal,

obtaining an image-to-signal-ratio of the radio frequency signal,

adaptation of the predistortion parameter for reduction of the image-to-signal-ratio.

5. The transmission method of claim 4, further comprising performing an iterative algorithm for adaptation of the predistortion parameter.

6. The transmission method of claim 4, further comprising using a cost function to perform the adaptation of the predistortion parameter.

7. The transmission method of claim 4, further comprising using a heterodyne receiver based feedback loop for estimating the power of a desired signal component of the radio frequency signal and the image component of the radio frequency signal.

8. The transmission method of claim 4, further comprising comparing the current image-to-signal-ratio with a threshold level in order to determine whether further adaptation of the predistortion parameter is required or not.

9. The transmission method of claim 4, wherein the adaptation of the predistortion parameter is performed by on-line processing.

10. A computer program product, in particular digital storage medium, for performing a transmission method of claim 4.