Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization

A technology of frequency characteristics and pre-distortion, applied in the field of linearization, can solve problems such as unsatisfactory satisfaction

Inactive Publication Date: 2002-10-16
NOKIA SOLUTIONS & NETWORKS GMBH ＆ CO KG
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Problems solved by technology

The known methods described above do not

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  • Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization
  • Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization
  • Method and apparatus for transmitting signal digital predistortion, frequency characteristic compensation and feed forward linearization

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Embodiment Construction

[0018] The components shown in Figure 1 include, on the upper side, a first signal processing chain for generating predistortion and frequency characteristic compensation signals, and on the lower side, a second signal processing chain for generating a reference signal . As will be explained below, the first and second signal processing chains are coupled to each other so as to form a correction loop for linearizing the digital signal.

[0019] In Fig. 1, the generation of the analog pre-distortion and frequency characteristic compensation signal entering through the first input line 1 and the generation of the analog reference signal entering through the second input line 2 will be combined later below figure 2 with image 3 Elaborate.

[0020] In the first signal processing chain shown on the upper side of FIG. 1 , the analog predistorted and frequency-characteristically compensated signal entering via the first connecting line 1 reaches the nonlinear main amplifier 3 and ...

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Abstract

In order to linearize the digital signal, two different signals are fed into the correction loop of the feedforward amplifier. One of the signals (the main signal) is pre-distorted and frequency-characteristically compensated before it is sent to the nonlinear amplifier (3). The second signal remains undistorted and is used as a reference signal, which is used to cancel out the main signal portion. These two signals are fed into a correction loop for a highly linearized output signal.

Description

technical field [0001] The invention relates to a method for the linearization of a digitally generated transmitted signal with combined digital predistortion and frequency response compensation linearization as well as feedforward linearization (forward correction linearization). [0002] Furthermore, the invention relates to several devices by which the method of the invention can be carried out. Background technique [0003] Known modulation methods with an amplitude modulation component generate interfering signal components on non-linear components of the transmit signal, such as spectral broadening of the transmit signal frequency and increase of the error signal. [0004] Kerington (Kerington) by P.B., published by Artech Press, book number ISBN 1-58053-143-1 "Highly Linear RF Amplifier Design" is known, for example, for the method of digital signal linearization, especially as A digital signal that appears in the transmitter of a digital mobile radio station. These...

Claims

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3235H03F1/3282H03F1/3294
Inventor T·菲尔根特雷夫
Owner NOKIA SOLUTIONS & NETWORKS GMBH ＆ CO KG
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