Method and device in a telecommunication system

A control system and control device technology, applied in the transmission system, multi-carrier system, modulated carrier system, etc., can solve the problems of reducing the bandwidth or speed of the control system, the inconvenience of normal operation interruption, etc., and achieve the reduction of boundary requirements and ensure stability , the effect of wide bandwidth
CN1168201CInactive Publication Date: 2004-09-22TELEFON AB LM ERICSSON (PUBL)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TELEFON AB LM ERICSSON (PUBL)
Publication Date
2004-09-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

According to the invention, a Cartesian control means (16) comprising a phase rotator (50) and a phase adjuster (52) is provided. With a method and a device according to the invention, a system is provided that is unconditionally stable with respect to non-phase alignment, regardless of input power changes, temperature and component ageing. No certain conditions need to be placed upon the control system to ensure stability, i.e. the system is non-obtrusive and requires no off-line calibration. The inclusion of the phase rotator (50) and phase adjustment techniques into the Cartesian control system makes this possible.
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Description

technical field

[0001] The present invention relates to Cartesian control systems. Background technique

[0002] In telecommunication systems, especially in RF applications, efficient methods of linearization are required to minimize intermodulation, one reason being distortions produced by nonlinearities in power amplifiers.

[0003] In wideband systems, there are two approaches to dealing with amplifier distortion: predistortion and feedforward. Predistortion means reversibly mimicking the distortion introduced by the main amplifier and supplied to the input of the amplifier, thereby producing a constant that is completely ideally equal to power independent.

[0004] The feedforward technique basically consists of two steps. The first step is to extract the distortion introduced by the main amplifier on the signal to be amplified. This is called extracting the error signal. The second step is to invert and time-align this error signal into the output of the feedforward...

Claims

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