A dual-path unbalanced signal generation system based on UQPSK

By designing a dual unbalanced signal generation system based on UQPSK, the problems of difficulty in multiplexing of dual UQPSK signals and low equipment flexibility in the prior art are solved, and constant envelope multiplexing and flexibility of carrier frequency and power are realized. Adjustment, suitable for a variety of satellite systems.

CN118074729BActive Publication Date: 2025-02-11成都玖锦科技有限公司
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Patent Information

Application Number
CN202410466775.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-04-18
Publication Date
2025-02-11
Estimated Expiration
2044-04-18

AI Technical Summary

Technical Problem

The prior art is difficult to realize constant envelope multiplexing of dual-channel UQPSK signals, and traditional equipment has low flexibility in carrier frequency and power regulation, which cannot meet the needs of multiple satellite equipment.

Method used

A dual unbalanced signal generation system based on UQPSK is designed. The signal component coefficient and intermodulation coefficient are calculated through the baseband signal generation part, and the dual unbalanced signal is generated. The signal processing board is used for IQ modulation, and the carrier frequency is output. Transmit an analog signal with adjustable power.

Benefits of technology

It realizes constant envelope multiplexing of dual non-balanced signals, flexibly sets the signal power ratio of in-phase and orthogonal branches, improves the multiplexing efficiency and signal flexibility, and is suitable for a variety of satellite systems.

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Abstract

The present invention discloses a dual-channel unbalanced signal generation system based on UQPSK, comprising: calculating signal component coefficients a1, a2, a3, and a4 according to the power ratio of each branch signal; then calculating signal intermodulation coefficients b1, b2, b3, and b4; then generating a dual-channel unbalanced signal baseband waveform file based on UQPSK, and storing it in DDR4; the system board reads the stored waveform file into a field programmable gate array FPGA, and sends control parameters of data length, sampling rate, working mode, and carrier frequency through a control module, and completes baseband signal digital processing in the field programmable gate array FPGA; and controls the NCO in the dual-channel digital-to-analog converter DAC according to the aforementioned control parameters to complete IQ modulation; the digital-to-analog converter DAC outputs an analog signal, and in the analog processing part, a direct output or an amplified output is performed. The present invention achieves high multiplexing efficiency and improves the transmission quality and power efficiency of the output analog signal.
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Citation Information

Patent Citations

  • Method and apparatus for modulating double UQPSK (Unbalance Quaternary Phase Shift Keying) signals

    CN105635013A

  • Signal phase alignment method in digital domain

    CN117762190A