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A ka-band qpsk direct modulation device and communication equipment

A frequency band, direct technology, applied in the field of Ka-band QPSK direct modulation device and communication equipment, can solve the problems of complex modulation system composition, and achieve the effect of simplified hardware circuit, high integration and strong versatility

Active Publication Date: 2021-05-11
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional Ka-band QPSK modulation generally chooses the indirect modulation method. After the modulation is completed at the intermediate frequency, the Ka-band modulation signal is output through up-conversion. Generally, the modulation system needs to include circuits such as local oscillators and filters, and the entire modulation system is complex.

Method used

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  • A ka-band qpsk direct modulation device and communication equipment
  • A ka-band qpsk direct modulation device and communication equipment
  • A ka-band qpsk direct modulation device and communication equipment

Examples

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Effect test

Embodiment 1

[0047] see figure 1 , the present embodiment provides a Ka-band QPSK direct modulation device, including:

[0048] An encoding module, the encoding module is used to receive the clock signal and the data signal, and encode the clock signal and the data signal to obtain the first I baseband signal and the first Q baseband signal;

[0049] DC blocking module, the DC blocking module is used to isolate the DC components of the first I baseband signal and the first Q baseband signal, retain the AC components of the first I baseband signal and the first Q baseband signal, and obtain the second I baseband signal, the second Q baseband signal;

[0050] The QPSK modulation module, the QPSK modulation module is used to receive the Ka frequency band carrier signal, and perform AC modulation on the Ka frequency band carrier signal, the second I baseband signal, and the second Q baseband signal to obtain a QPSK signal.

[0051] see image 3, the encoding module of the present embodiment...

Embodiment 2

[0056] see figure 1 , this embodiment provides a Ka-band QPSK direct modulation device based on Embodiment 1.

[0057] The encoding module of this embodiment is also used to reshape the first I baseband signal and the first Q baseband signal, and the reshaping includes phase adjustment and signal filtering; wherein, the phase adjustment is to adjust the first I baseband signal and the first Q baseband signal. Phase difference; signal filtering is to filter the first I baseband signal and the first Q baseband signal. Because the baseband signal obtained by direct encoding is also affected by the interference signal, and the phase difference of the baseband signal directly affects the performance index of the modulated signal, therefore, in this embodiment, the two-way I, Q baseband The signal is filtered to reduce the amplitude of the out-of-band signal. At the same time, the phase difference of the I and Q baseband signals is adjusted through the FPGA to ensure that the phase...

Embodiment 3

[0066] This embodiment provides a communication device based on Embodiment 2, which adopts the Ka-band QPSK direct modulation device as required by any one of Embodiment 2.

[0067] The communication device in this embodiment uses the Ka-band QPSK direct modulation device to directly modulate the Ka-band data information to obtain a QPSK signal, and transmits the data to other devices at high speed through the QPSK signal. The communication equipment using the Ka-band QPSK direct modulation device has the following technical characteristics:

[0068] 1) Key indicators such as the amplitude imbalance degree, phase imbalance degree, carrier suppression degree, and port standing wave of the QPSK signal in this embodiment can meet the requirements. Compared with the traditional QPSK indirect modulation and distributed modulation methods, it can realize small size , light weight, low power consumption, low cost, simplified design, simple interface and other effects;

[0069] 2) Th...

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Abstract

The invention discloses a Ka frequency band QPSK direct modulation device, comprising: an encoding module, the encoding module is used to receive a clock signal and a data signal, and encode the clock signal and the data signal to obtain the first I baseband signal and the first Q baseband Signal; DC blocking module, the DC blocking module is used to isolate the DC component of the first I baseband signal and the first Q baseband signal, retain the AC component of the first I baseband signal and the first Q baseband signal, and obtain the second I baseband signal, The first Q baseband signal; the QPSK modulation module, the QPSK modulation module is used to receive the Ka frequency band carrier signal, and perform AC modulation on the Ka frequency band carrier signal, the second I baseband signal, and the first Q baseband signal to obtain a QPSK signal. The invention has the technical characteristics of small volume, light weight, low power consumption, low cost, simplified design and simple interface.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a Ka frequency band QPSK direct modulation device and communication equipment. Background technique [0002] With the continuous development of satellite technology, the satellite mission and payload data are getting larger and larger, and more and more data need to be downloaded to the ground station. In many cases, it is necessary to ensure the real-time transmission. The satellite has more and more requirements on the data transmission subsystem. Higher and higher, the modulation rate has developed from the early megahertz low-speed data transmission to gigahertz or even higher-speed high-speed data transmission, the modulation method has also developed from simple BPSK to QPSK and more efficient modulation methods, and the modulation frequency has changed from S-band Extends to the Ka band and beyond. [0003] At present, some high-orbit satellites in my co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20
CPCH04L27/20
Inventor 董巍戴琳谢晔黄波张康雷
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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