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High-spectral-efficiency microwave same-frequency signal interference suppression device and method

An interference suppression device and a technology for co-frequency signals, which are applied in phase modulation carrier systems, modulation carrier systems, electromagnetic wave transmission systems, etc., can solve the problems affecting the interference signal suppression level, etc. Effect

Active Publication Date: 2019-09-24
EAST CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention proposes a high-spectrum-efficiency microwave co-frequency signal interference suppression device and method, using a single optical modulator structure to simultaneously realize the suppression of co-frequency interference signals and the suppression of useful signals in the optical domain Carrier single sideband modulation, on the basis of solving the problem of fiber dispersion affecting the interference signal suppression level in most existing technologies, at the same time greatly improving the spectral efficiency of the system

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  • High-spectral-efficiency microwave same-frequency signal interference suppression device and method

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Embodiment 1

[0061] In this embodiment, the wavelength of the optical signal output by the laser is 1553.275 nm. Adjust the DC bias voltage so that both sub-MZMs of the DP-BPSK modulator are biased at the orthogonal transmission point. In this embodiment, the suppression of single-frequency and same-frequency interference signals is realized and verified, wherein the useful signal in the received signal is set to 0, that is, the received signal only contains the interference signal. figure 2 It is the spectrogram of different positions in the device when a single-frequency interference signal is input, (a) the frequency of the interference signal is 8GHz, (b) the frequency of the interference signal is 10.2GHz, (c) the frequency of the interference signal is 12.4GHz. It can be seen that the outputs of the two DD-MZMs are single-sideband modulation signals. When interference suppression is not used, the optical signal output by the polarizer still contains a first-order optical sideband ge...

Embodiment 2

[0063] In this embodiment, the wavelength of the optical signal output by the laser is 1553.275 nm. Adjust the DC bias voltage so that both sub-MZMs of the DP-BPSK modulator are biased at the orthogonal transmission point. In this embodiment, the suppression performance of broadband co-frequency interference signal is realized and verified. At this time, the interference signal in the received signal is set as a broadband QPSK modulation signal, and the useful signal is a pure microwave signal of the same frequency. Figure 5 It is the spectrogram of different positions in the device when a broadband interference signal is input, (a) the frequency of the interference signal is 10.2GHz, (b) the frequency of the interference signal is 12.4GHz. Due to the limitation of the resolution of the spectrometer, in order to observe the interference suppression of the broadband signal, the broadband interference signal is set as a QPSK signal with a baud rate of 5Gbaud, which is determine...

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Abstract

The invention relates to a high-spectral-efficiency microwave same-frequency signal interference suppression device and method, and belongs to the technical field of microwave signal processing. The device comprises a laser, a polarization multiplexing Mach-Zehnder modulator, namely a DP-BPSK modulator, a received signal simulator, an interference signal simulator, a first 90-degree electric mixer, a second 90-degree electric mixer, a direct-current power supply, a polarization controller, a polarizer and an optical receiver. A dual-drive Mach-Zehnder modulator (DD-MZM) of a DP-BPSK modulator is used for carrying out single sideband modulation on a received signal, and the other DD-MZM performs single sideband modulation on the interference signal, the interference signal is suppressed in an optical domain after the two paths of optical signals are coupled, and meanwhile, the useful signal is subjected to suppression carrier single sideband modulation. Due to the fact that interference is eliminated in an optical domain, dispersion in signal optical fiber transmission will not enable interference signals to appear again, in addition, system spectral efficiency is improved through suppression carrier single-sideband modulation of useful signals, and meanwhile the influence of dispersion on useful signal transmission is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of microwave signal processing, and relates to a high spectral efficiency microwave co-frequency signal interference suppression device and method. Background technique [0002] The in-band full-duplex wireless system is a new wireless communication system to further improve the spectrum efficiency of the wireless system. Unlike traditional full-duplex wireless communication systems that use different carrier frequencies for uplink and downlink, in-band full-duplex wireless systems use the same carrier frequency for uplink and downlink wireless links, thereby greatly improving the frequency utilization of the system. [0003] The most important problem faced by the in-band full-duplex wireless system is the co-channel interference of uplink and downlink. Since the uplink and downlink use the same carrier frequency, the high-power downlink signal transmitted by the transmitting antenna will crosstalk to the ...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04B10/556H04L27/20
CPCH04B10/2513H04B10/5561H04L27/2039
Inventor 陈阳
Owner EAST CHINA NORMAL UNIVERSITY
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