A SSB Signal Recovery Algorithm Based on Time-Domain Iteration
A signal recovery and single sideband technology, applied in the direction of eliminating distortion/dispersion, optical fiber transmission, electrical components, etc., can solve problems such as high complexity and reduced computational complexity, and achieve the effect of reducing complexity and avoiding nonlinear operations
Active Publication Date: 2022-03-08
SUN YAT SEN UNIV
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Problems solved by technology
Compared with the traditional KK receiver, the algorithm based on the frequency domain iterative algorithm to restore the SSB signal avoids nonlinear operations, so it does not need to perform up-sampling and down-sampling, and its computational complexity is obtained compared with the KK algorithm. However, since the iterative process is implemented in the frequency domain, discrete Fourier transform and inverse discrete Fourier transform (FFT / IFFT) are required to achieve time-frequency domain conversion in each iteration process. high complexity problems
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[0053] The accompanying drawings are for illustrative purposes only, and should not be construed as limiting the present invention; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as limiting the present invention.
[0054] 1. Specific implementation plan
[0055] Such as figure 1 As shown, the laser at the transmitting end is divided into two paths after passing through an optical coupler, and one path of light is input to the IQ modulator for signal modulation, where the IQ modulator is biased at zero, and the SSB signal is modulated to On the optical carrier; the other way is used as a...
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The invention relates to a SSB signal recovery algorithm based on time-domain iteration, which utilizes the SSB characteristics and DC characteristics of the SSB signal satisfying the minimum phase condition, and realizes the SSB signal recovery through the FIR filter in the time domain. Generated iteratively, and continuously update the phase value. After several iterations, the amplitude of the generated SSB signal approaches the received amplitude value, and since the amplitude and phase of the SSB signal satisfying the minimum phase condition satisfy the KK relationship, the SSB signal The phase is recovered, that is, the single sideband signal can be reconstructed. Realize the iterative generation of SSB signals in the time domain through a low-complexity FIR filter, iteratively update the phase value and finally restore the original SSBI signal, thereby eliminating the influence of SSBI; the present invention does not need to perform up-sampling and down-sampling sampling, and avoid the FFT / IFFT transformation pair in the iterative process, so that the computational complexity of the receiving end is further reduced.
Description
technical field [0001] The present invention relates to the technical field of optical communication system and high-speed optical signal processing, and more specifically, to a single sideband signal recovery algorithm based on time domain iteration. Background technique [0002] The main problem in the SSB direct detection system is that the signal-to-signal beating interference (Signal-to-Signal Beating Interference, SSBI) will be introduced after the SSB signal is directly detected by a single photodiode PD, which will seriously damage the reception End-to-line reception of signals. At present, the scheme of eliminating SSBI based on Kramers-Kronig (KK) receiver has received extensive attention. After the SSB signal satisfying the minimum phase condition is directly detected, there is a KK relationship between the received strength signal and the phase of the SSB signal. Therefore, the phase information of the SSB signal can be recovered by using the KK algorithm, ther...
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IPC IPC(8): H04B10/69H04B10/516H04B10/50H04B10/564H04B10/2513H04B10/2507
CPCH04B10/6971H04B10/69H04B10/5165H04B10/503H04B10/564H04B10/2513H04B10/2507
Inventor 李凡王玮李朝晖
Owner SUN YAT SEN UNIV