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Closed loop control device and method based on double detection LTE signal levels

A signal level and closed-loop control technology, which is applied in transmission monitoring, electrical components, transmitter monitoring, etc., can solve the problems that broadband time slot signals cannot be closed-loop, and the communication signal amplitude error is large, so as to achieve stable and accurate output and strong universality sexual effect

Active Publication Date: 2016-12-07
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Application Information

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Problems solved by technology

However, the closed-loop negative feedback amplitude control circuit is limited by the loop bandwidth, and can only perform closed-loop amplitude control for CW wave signals. For the broadband time slot signals of the new generation of communication, closed-loop cannot be achieved. When using open-loop amplitude control, because the circuit Due to factors such as device temperature drift and aging, the amplitude error of the communication signal is relatively large

Method used

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  • Closed loop control device and method based on double detection LTE signal levels
  • Closed loop control device and method based on double detection LTE signal levels
  • Closed loop control device and method based on double detection LTE signal levels

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Embodiment 1

[0056] Aiming at the test requirements for high-precision long-term stable output of LTE signals in communication broadband time slots, this embodiment describes a device for controlling the amplitude of LTE communication signals by using the high-speed signal processing capabilities of new programmable devices combined with the characteristics of dual-detection temperature dissimilation and elimination. Such as figure 1 The hardware schematic diagram of the three-dimensional digitized intrapulse LTE high-speed closed-loop control based on dual detection is shown, including 14 units: frequency-selective filter unit, voltage-controlled attenuation unit, first impedance matching unit, channel compensation amplification unit, and second impedance matching unit Unit, high power amplification unit, broadband signal coupling unit, main detection circuit, auxiliary detection circuit, main AD conversion unit, auxiliary AD conversion unit, FPGA data processing unit, DA control unit and ...

Embodiment 2

[0077] On the basis of the above-mentioned embodiments, the present invention also mentions a three-dimensional digitized intrapulse LTE signal level closed-loop control method based on dual detection, specifically as follows:

[0078] (1) Through the frequency selection filter unit ①, the broadband communication signal F 1 Carry out signal filtering processing, select appropriate filtering parameters according to the bandwidth occupied by the signal, and suppress the far-end and near-end spectrum spurs;

[0079] (2) The voltage-controlled attenuation unit ② converts the filtered broadband communication signal F 1 To control the signal level, the amplitude is Lv1. The amplitude of the output signal of the voltage-controlled attenuation unit ② changes linearly with the size of the control voltage. The control voltage comes from the control data of the FPGA. The variable range of the voltage-controlled attenuation unit ② determines the final Amplitude control range of the entir...

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Abstract

The invention discloses a closed loop control device and method based on double detection LTE signal levels, and belongs to the technical field of test technology. According to the closed loop control device and method disclosed by the invention, inherent temperature drift of a negative feedback closed loop circuit and errors introduced by device aging are eliminated in the double detection manner; signal insertion loss compensation introduced by the negative feedback closed loop circuit and amplitude control range expansion are realized by a channel combination amplifying circuit; fast processing of amplitude control in three dimensions of time domain, frequency domain and temperature of a communication signal is realized by an FPGA digital signal processing unit; amplitude negative feedback closed loop control is carried out in a specific sub-frame by the amplitude negative feedback closed loop principle, the problem that the amplitude control of the negative feedback closed loop cannot be carried in a broadband communication time slot signal is effectively solved, the stable and accurate output of a high speed time slot signal in modern communication is realized, and the requirements of modern communication equipment and terminal test on the long-term stable and accurate output of the large bandwidth communication signal are satisfied.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a double-detection-based LTE signal level closed-loop control device and method. Background technique [0002] Analog signals are widely used in modern communication. With the development of modern communication technology, the level accuracy and stability of analog signals are required to be higher and higher. In multi-standard communication tests such as LTE, the maximum output power, absolute power control tolerance, relative power control tolerance, aggregate power control and many other main index tests are closely related to the amplitude stability and accuracy of the downlink signal. Achieving high stability and accurate output of downlink signals is a difficult point in LTE testing. [0003] The traditional analog signal amplitude control mostly adopts the analog closed-loop negative feedback method, which has the characteristics of good stability and high pr...

Claims

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Application Information

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IPC IPC(8): H04B17/15H04B17/391H04B17/29
CPCH04B17/15H04B17/29H04B17/3912
Inventor 张煜刘祖深凌云志王先鹏韦巍
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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