Photon-assisted multi-channel compression sampling (CS) system and method

Abstract

The invention relates to the technical field of signal processing and discloses a photon-assisted multi-channel compression sampling (CS) system, which is characterized in that the system comprises a first electrooptical modulator, a first demultiplexer, an optical delay line, a multiplexer, a second electrooptical modulator and a second demultiplexer which are sequentially connected with each other. By using photoelectric devices (electrooptical modulators of tens of GHz wideband) of the wideband to realize frequency mixing of the signals of the tens of GHz wideband and by generating different orthogonal code sequences through different optical delays of pseudo-random codes, the system only needs one pseudo-random sequence generator, the cost of the multi-channel CS system is greatly reduced, the number of the channels of the system is improved and the system integration is facilitated at the same time. In combination with the use of multi-wavelength optical carriers, the system only needs two electrooptical modulators and can realize the frequency mixing of different pseudo-random codes and radio-frequency signals.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a photon-assisted compression sampling system and method. Background technique [0002] When sampling broadband and spectrally sparse signals, the sampling rate required by Compressive Sampling (CS) is much lower than the Nyquist sampling rate, which has the characteristics of low sampling rate and effectively reduces the cost of data processing after sampling. . The related applications of CS technology are very extensive, such as broadband spectrum sensing of communication base stations, SAR (Synthetic Aperture Radar) high-resolution imaging, MIMO (Multiple Input Multiple Output) radar for signal direction identification and target detection, broadband, dynamic spectrum monitoring etc. [0003] At present, the principle framework of the electric CS system is relatively mature. The system is mainly composed of two parts: sensing matrix and recovery algorithm. The s...

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Problems solved by technology

[0005] At present, there are three main limitations in the electrical CS system solution: 1. Limited by the operating bandwidth of traditional electrical mixing devices, the operating bandwidth of the CS system based on electronic devices is only a few hundred MHz, and it is impossible to achieve GHz-level bandwidth or even bandwidth Larger compressed sampling; 2. Each channel needs a broadband mixer and code generator, such as figure 1 As shown, the system structure is complex, which is not conducive to increasing the number of channels; 3. With the increase of the number of system channels, the power of the radio frequency to each mixer decreases, which will lead to the deterioration of the input signal-to-noise ratio, making it difficult to improve the system. number of channels

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