Digital pre-distortion device and method
A technology of digital predistortion and predistorter, which is applied in the field of digital predistortion, can solve problems such as worrying reliability, high circuit complexity, and reduced reliability, so as to reduce costs, improve system reliability, and achieve high-efficiency linearity Effect
Active Publication Date: 2014-06-11
成都芯通软件有限公司
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Problems solved by technology
[0004]In the remote front-end equipment of the traditional transmission link, the digital pre-distortion circuit and power amplifier are placed in the outdoor chassis, so that a large number of high-speed digital signal processing chips and frequency conversion circuits Working in harsh outdoor environments, its reliability is worrying. At the same time, the circuit complexity of the outdoor unit is also high.
In the current relatively narrow signal bandwidth (about 20MHz), the above problems are still in an acceptable range, but as the signal bandwidth in the next generation wireless communication system increases to 100MHz, if the current mode is continued, the function of the outdoor unit The consumption and complexity will be greatly increased, and the reliability will be reduced
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[0017] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.
[0018] Such as figure 1 The traditional digital pre-distortion circuit block diagram shown, its working principle is: the input baseband I / Q signal 400 enters the pre-distorter 401, by comparing the feedback signal from ADC405, the pre-distortion correction coefficient is generated and pre-distortion processing is performed, and the pre-distortion The distorted signal is output to DAC402 to become an analog signal, the analog signal is then modulated to the radio frequency by QMOD403, and then amplified by PA404 and output; at the same time, part of the output of PA404 is coupled to Mixer406 to become an intermediate frequency signal, which is transformed by ADC405 The digital signal is sent to the pre-distortion module 401. LO407 provides the required local oscillator signal for Mixer406 and QMOD403.
[0019] Such as figure 2 The di...
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The invention discloses a digital pre-distortion device which comprises a predistorter (101), a digital-to-analog converter (DAC) (102), a quadrature modulator (QMOD) (103), an analog-to-digital converter (ADC) (110), a transducer (111), a local oscillator (LO) (109) and a power amplifier (108); and the device is characterized by also comprising an analog photoelectric / electric-optical conversion module and optical fiber (201) which is respectively connected with the quadrature modulator (QMOD) (103), the power amplifier (108) and the down-conversion mixer (111). The invention also discloses a digital predistortion method. The invention enables the circuits such as the predistorter comprising a high-speed digital signal processing chip, and the like which are originally arranged outdoors to be arranged indoors, realizes high efficiency and high linearity of the power amplifier, simplifies the circuit of remote outdoor equipment, and improves the system reliability.
Description
Technical field [0001] The present invention involves digital pre -disturbance technology in the front -end device of wireless communication, especially a digital pre -disturbing device and method. Background technique [0002] With the development of modern wireless communication technology, mobile communication users and business volume are growing sharply, and the communication frequency band has become more and more crowded.In order to improve the efficiency of the spectrum so that more channels can be transmitted within a limited spectrum range, QPSK (orthogonal phase shift key control) and QAM (orthogonal amplitude modulation) are generally adopted.Displaying a high requirement for the linear of the end -level amplifier of the system.In the current popular amplifier linearization technology, digital preheating technology has received widespread attention and research due to its strong adaptability, wide dynamic range, and frequency bandwidth.At present, an integrated digita...
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IPC IPC(8): H04L25/49H04B10/58H04B10/69
Inventor 邱岱
Owner 成都芯通软件有限公司