Efficient coherent channelized receiving system and efficient coherent channelized receiving method
A receiving method and channelization technology, applied in the field of efficient coherent channelization receiving systems, can solve the problems of low channelization efficiency and large number, and achieve the effects of improving signal-to-noise ratio, improving utilization efficiency, and suppressing in-band interference
Pending Publication Date: 2020-06-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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Problems solved by technology
Specifically, a relatively mature channelization scheme based on coherent reception proposed by the team of Xiaojun Xie of Beijing University of Posts and Telecommunications. Coherent reception brings large in-band signal interference. The channelization efficiency of such a photon channelization scheme is low. When the bandwidth of the original signal is large, photon channelization requires a large number of optical carriers and local oscillator signals
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[0053] figure 1 It is a functional block diagram of an efficient coherent channelized receiving system of the present invention.
[0054] In this example, if figure 1 As shown, a high-efficiency coherent channelized receiving system of the present invention includes: an ultra-flat optical frequency comb generator group, a wavelength selector group, a photoelectric modulation unit, a signal splitter, a coherent detector, a spectrum mixer, and a de-aliasing device and narrowband extraction unit;
[0055] The ultra-flat optical frequency comb generator group includes two ultra-flat optical frequency comb generators with different comb line intervals, namely the carrier optical frequency comb generator and the local oscillator optical frequency comb generator. The carrier optical frequency comb generator provides the system with Carrier optical frequency comb, local oscillator optical frequency comb generator provides local oscillator optical frequency comb for the system;
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The invention discloses a high-efficiency coherent channelized receiving system and method, and the method comprises the steps: firstly generating an optical frequency comb line serving as an opticalcarrier and a local oscillation signal through an improved super-flat optical frequency comb generator, and enabling the flatness of the optical frequency comb line to be 1dB; modulating the broadbandsignal on an optical carrier by using a Mach-Zehnder modulator in a carrier suppression double-sideband state to generate 2m optical copies; next, processing each optical copy by a symmetric electricmixer after being detected by a 2X4 optical mixer, and dividing each optical copy into I / Q electric signals; and finally, extracting required narrowband sub-signals from the I / Q electric signals by using a low-pass filter.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically, relates to an efficient coherent channelized receiving system and method. Background technique [0002] Wideband microwave signal receivers are in demand in a wide range of commercial and military applications, such as radio-over-fiber (ROF) systems, arbitrary waveform generators, and modern radars. Since the wideband signal reception is limited by the analog-to-digital / digital-to-analog converter, the channelization receiver is used as a special pre-processor to channelize the wideband signal into different narrowband sub-channels. [0003] Compared with the case where the instantaneous bandwidth of an electrical channelized receiver is limited to a few GHz, the bandwidth of a channelized receiver based on microwave photonic technology can be as large as tens of GHz. [0004] In general, channelization schemes based on microwave photonics technology can be ...
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Login to View More IPC IPC(8): H04B10/61
CPCH04B10/61H04B10/615H04B10/616
Inventor 张崇富王若藩黄欢陈勇高庆国邱昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA