A method and system for synthesis and calibration of terahertz space quadrature modulation signals

A technology of orthogonal modulation and signal synthesis, which is applied in the field of terahertz communication, can solve the problems of increasing the difficulty of synthesizing signals, and achieve the effects of avoiding power back-off, widening communication bandwidth, and improving efficiency

Active Publication Date: 2021-11-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, due to the amplitude and phase requirements of the two orthogonal branches of the synthesized signal, it is necessary to continuously adjust the amplitude and phase of the signals sent by channel 1 and channel 2 during the synthesis process, which increases the difficulty of synthesizing the signal

Method used

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  • A method and system for synthesis and calibration of terahertz space quadrature modulation signals
  • A method and system for synthesis and calibration of terahertz space quadrature modulation signals
  • A method and system for synthesis and calibration of terahertz space quadrature modulation signals

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Embodiment 1

[0067] Such as figure 1 As shown, a method for synthesizing and calibrating a terahertz spatial quadrature modulation signal disclosed in this embodiment, the specific implementation steps are as follows:

[0068]Step 1. According to the good autocorrelation characteristics of the PN code, the sending end uses the FPGA logic device to generate two sets of mutually orthogonal PN codes with the same rate of 1.25Gbps, a spreading ratio of 1024, and an oversampling factor of 4. The mutually orthogonal PN codes are respectively sent out by the first digital-to-analog converter DAC1 and the second digital-to-analog converter DAC2.

[0069] The mutually orthogonal PN sequences of the two channels have a cross-correlation property of 0 everywhere.

[0070] The autocorrelation property is represented by the following formula:

[0071] (7)

[0072] in is the autocorrelation function of the pseudorandom sequence, N is the length of the pseudorandom sequence, N =1024.

[0073]...

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Abstract

The invention discloses a method and system for synthesizing and calibrating terahertz spatial quadrature modulation signals, belonging to the technical field of terahertz communication. The invention discloses a method for synthesizing and calibrating terahertz space quadrature modulation signals and a system for synthesizing and calibrating terahertz space quadrature modulation signals. The present invention detects the amplitude phase difference of channel one and channel two quadrature signals by sending a pseudo-code pilot, and automatically calibrates the spatial quadrature modulation signal synthesis transmission system according to the feedback difference value, thereby improving the efficiency of synthesizing quadrature modulation signals; the two channels After sending mutually orthogonal constant-envelope modulation signals to modulate into the terahertz frequency band, one broadband modulation signal is non-destructively synthesized at the remote end of the free space, that is, to achieve high-efficiency synthesis of two-channel orthogonal signals in the terahertz band space. Since the constant envelope signal is adopted, the present invention can avoid the power back-off of the power amplifier, reduce the requirement on the linearity of the power amplifier, and further improve the efficiency of the power amplifier and the energy efficiency of the terahertz transmission system.

Description

technical field [0001] The invention relates to a method and system for synthesizing and calibrating terahertz spatial quadrature modulation signals, belonging to the technical field of terahertz communication. Background technique [0002] In recent years, with the rapid development of satellite communication, navigation, radar, remote sensing, electronic countermeasures and other systems, microwave power amplifier technology has also been continuously improved with the development of science and technology in my country. Whether it is radar or satellite technology, the high-performance microwave power amplifier demand is increasing year by year. The power amplifier plays an irreplaceable role in the communication system. The output power of the power amplifier directly or indirectly affects the communication performance of many aspects of the system, such as: the communication quality between devices, the anti-interference ability between adjacent channels, and the communic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/90H04B17/11H04L27/26
CPCH04B10/90H04B17/11H04L27/2657H04L27/266
Inventor 李建国毛瑞源赵良斌梁弼政卜祥元安建平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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