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Transmitter apparatus

A transmitter and equipment technology, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of phase imbalance, power amplifier noise affecting measurement, etc., and achieve the effect of accurate measurement and the smallest possible error

Inactive Publication Date: 2007-12-19
NXP BV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of the method and arrangement known from US 2002 / 0015450 A1 is that the phase imbalance is corrected relative to a single test frequency
Another disadvantage is that the noise from the power amplifier affects the measurement due to coupling out of the test signal after the power amplifier

Method used

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Embodiment Construction

[0017] Fig. 1 shows a schematic structure of a transmitter device 1 according to a preferred embodiment of the present invention. The transmitter device 1 may be used in a wireless communication system such as Global System for Mobile Communications (GSM) or Enhanced Data Rates for GSM Evolution (EDGE). The transmitter device 1 and the method described below are applicable to the transmitter 1 having the digital modulator 2 that performs digital in-phase / quadrature modulation.

[0018] The transmitter device 1 comprises a modulator 2 , a delay unit 3 , a first digital-to-analog converter 4 and a second digital-to-analog converter 5 . The modulator 2 is adapted to receive a digital signal via line 6 and convert the received signal into a digital in-phase signal and a digital quadrature signal. The digital in-phase signal is output from modulator 4 to converter 4 via line 7 . The digital quadrature signal is output to the converter 5 through the line 8 . The converter 4 is ad...

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PUM

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Abstract

A transmitter apparatus (1) comprises a digital modulator (2), wherein the modulator is adapted to output a digital in-phase signal and a digital quadrature signal. The digital in-phase signal is converted to an analog in-phase signal and further processed in a path (31) for the in-phase signal, and a digital quadrature signal is converted in an analog quadrature signal and further processed in a path (34) for the quadrature signal. Thereby, an amplitude and delay mismatch in the path can occur. With the transmitter apparatus (1) of the invention the amplitude and delay mismatch can be measured. Further, an amplitude correction unit (43) is adapted for correcting the amplitude mismatch and a delay unit (3) is adapted to correct the delay mismatch. Further refinements of the amplitude and delay mismatch can be made with one or more predetermined test signals generated by a test signal generating unit (30).

Description

technical field [0001] The invention relates to a transmitter device, in particular a baseband transmitter for a wireless communication system, and a method of measuring and compensating for signal imbalance. More specifically, the present invention relates to a transmitter device adapted to compensate for amplitude and delay mismatches and for amplitude and delay mismatches for mobile communication systems such as Global System for Mobile Communications (GSM) or Enhanced Data Rates for GSM Evolution (EDGE). with methods of measurement and compensation. Background technique [0002] Prior art document US 2002 / 0015450 A1 describes a method and an arrangement for determining correction parameters for correcting phase and amplitude imbalances of an in-phase / quadrature modulator in a transmitter. Therefore, a coupler is provided at the antenna to couple out the high-frequency signal generated by the transmitter after the amplifier. The high frequency signal is sampled, and bas...

Claims

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Application Information

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IPC IPC(8): H04L27/20
CPCH04L27/2017H04L27/364H04L27/34
Inventor 亚历山大·兰普雷内·迪埃特奇
Owner NXP BV
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