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Distortion simulator of broadcast communication transmitter and its distortion correction test method

A technology of broadcast communication and emulator, which is applied in the directions of transmitter monitoring, broadcast monitoring/testing/troubleshooting device, transmission monitoring, etc. It can solve the problems of spectrum distortion, no reference, complex memory nonlinear amplifier model, etc. Achieve the effect of saving experiment cost and reducing complexity

Inactive Publication Date: 2009-05-13
BEIHANG UNIV
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Problems solved by technology

[0015] (3) The reason for carrier leakage is that in the baseband digital-to-analog conversion circuit, the output analog baseband signal is mixed with an additive DC component, and the analog baseband signal with the DC component is input to the frequency conversion circuit of the subsequent stage, and the carrier frequency point is added. Undue power, causing distortion of the spectrogram
[0025] (2) The model of the non-linear amplifier with memory is relatively complicated, and many description methods have been proposed, the most common one is the Volterra series model
The corrector in the existing exciter is to offset the distortion effect in the power amplifier, rather than to simulate the distortion effect in the power amplifier. There is no similar emulator device mentioned in the existing literature, so the simulation proposed by the present invention Linear and non-linear distortion equipment is necessary

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  • Distortion simulator of broadcast communication transmitter and its distortion correction test method
  • Distortion simulator of broadcast communication transmitter and its distortion correction test method
  • Distortion simulator of broadcast communication transmitter and its distortion correction test method

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Embodiment Construction

[0113] The present invention is illustrated below in conjunction with accompanying drawing: be used for the transmission distortion emulator 3 of broadcast communication transmitter distortion correction test, as figure 1 As shown, the structure includes a down converter 31, an analog-to-digital converter 32, a first selection switch 33, a linear distortion simulation module 34, a nonlinear distortion simulation module 35, a power protection module 36, a second selection switch 37, and a digital-to-analog converter 38. Up-converter 39, controller 310, and user interface 311.

[0114] The radio frequency input signal E is input to the down converter 31, the carrier frequency of the down converter 31 is set by the controller 310, the down converter 31 completes the down conversion process, and the radio frequency signal is down converted into an analog baseband signal, which is input into the analog-to-digital converter 32; The analog-to-digital converter 32 converts the analog ...

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Abstract

The invention relates to a distortion emulator of a broadcast communication transmitter and a method for detecting distortion correction of the emulator. The emulator simulates distortion models of various transmitters through a linear distortion emulation module and a non-linear distortion emulation module, and detects the performance of system distortion correction. The emulator also comprises a down converter and an up converter processing a radio-frequency signal, so that both a radio-frequency band signal and a digital baseband signal can be processed. The method comprises correction performance testing method of a broadcast communication transmitter and distortion performance testing method of a broadcast communication system anti-transmitter. The method evaluates the correction performance of an exciter and the anti-transmission distortion performance of the communication system by simulating transmission distortion through a distortion emulator. With the device and the method, the performance of the transmitter and a receiver of the broadcast communication system can be evaluated under a laboratory environment. Compared with the traditional experiment method, the complexity degree of laboratory equipment is lowered and experimental costs are reduced.

Description

technical field [0001] The invention belongs to the field of digital communication testing, and relates to a distortion emulator of a broadcast communication transmitter and a distortion correction test method thereof. Specifically, the invention relates to a simulation device for simulating transmission distortion and a method and method for performing correction performance tests on a broadcast communication transmitter A method for testing the anti-distortion interference performance of a broadcast communication system. Background technique [0002] With the development of digital communication technology, various new technologies are constantly emerging, and new digital communication systems are constantly emerging. Compared with analog modulated signals, digitally modulated signals have wider bandwidth, and the output amplitude has a larger dynamic range. There are also various modulation devices and means, which put forward higher requirements for the development and m...

Claims

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Application Information

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IPC IPC(8): H04H20/12H04B17/00H04B17/12
Inventor 张晓林路程李铀
Owner BEIHANG UNIV
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