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: 2011-05-18
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 embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0018] like figure 1 The traditional digital predistortion circuit block diagram shown, its working principle is: the input baseband I / Q signal 400 enters the predistorter 401, and by comparing the feedback signal from the ADC 405, the predistortion correction coefficient is generated and the predistortion processing is performed. The distorted signal is output to DAC402 to become an analog signal, the analog signal is modulated to 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 converted into an intermediate frequency signal by ADC405 The digital signal is sent to the predistortion module 401 . LO407 provides the required local oscillator signal for Mixer406 and QMOD403.
[0019] like figure 2 Th...
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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 invention relates to digital pre-distortion technology in wireless communication front-end equipment, in particular to a digital pre-distortion device and method. Background technique [0002] With the development of modern wireless communication technology, the users and business volume of mobile communication are increasing rapidly, and the communication frequency band becomes more and more crowded. In order to improve spectral efficiency and transmit more channels within a limited spectrum range, modulation methods such as QPSK (Quadrature Phase Shift Keying) and QAM (Quadrature Amplitude Modulation) are generally used, so that the signal envelope will inevitably Jitter is generated, which puts high demands on the linearity of the final power amplifier of the system. Among the current popular power amplifier linearization technologies, digital predistortion technology has received extensive attention and research because of its strong adaptabil...
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Login to View More IPC IPC(8): H04L25/49H04B10/17
Inventor 邱岱
Owner 成都芯通软件有限公司