A method for compensating the inherent inter-subcarrier interference of sefdm system
A technology of inter-subcarrier interference and zero-filling, applied in the field of optical communication, can solve problems such as deviation of calculation results, no compensation method, interference, etc., and achieve the effect of reducing computational complexity, improving accuracy, and simplifying formulas
Active Publication Date: 2021-07-27
HUAZHONG UNIV OF SCI & TECH
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[0004] In view of the defects of the prior art, the purpose of the present invention is to solve the interference between subcarriers inherent in the SEFDM system. The existing soft-decision iterative algorithm has certain defects in the decision strategy, which leads to deviations in the calculation results of the joint algorithm pre-estimation stage. , and the fixed spherical algorithm used in the accurate detection stage has extremely high computational complexity, and there is currently no technical problem of an effective and comprehensive compensation method
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[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0050] Aiming at the shortcomings of the prior art, the present invention discloses a joint interference compensation method between sub-carriers in a SEFDM communication system, the purpose of which is to adopt the scheme of "pre-estimation + precise detection". The iterative algorithm of IQ separation is a pre-estimation, and the detection algorithm based on Fourier transform is an accurate es...
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The invention discloses a method for compensating the inherent inter-subcarrier interference of the SEFDM system, which adopts "pre-estimation + precise detection". The iterative algorithm of IQ separation is a pre-estimation, and the detection algorithm based on Fourier transform is an accurate estimation. The IQ separation iterative algorithm performs IQ separation on the extracted data symbols and implements soft judgment respectively, sets zero to the components that cannot be accurately judged, calculates the interference between subcarriers generated by the accurate judgment data symbols, removes this part of the interference and proceeds an iterative algorithm. The detection algorithm based on Fourier transform is accurate detection, and the Fourier transform calculation is performed on the roughly estimated data symbols to restore the data deleted in the transmitter and compensate for the interference between subcarriers caused by compression. Compared with the existing joint iterative algorithm compensation scheme, the present invention has the ability to eliminate the interference between sub-carriers, and at the same time reduces the amount of calculation due to the simpler decision process.
Description
technical field [0001] The present invention relates to the technical field of optical communication, and more specifically, relates to a method for compensating inherent inter-subcarrier interference of a SEFDM system. Background technique [0002] Spectrally Efficient Frequency Division Multiplexing (Spectrally Efficient Frequency Division Multiplexing) in optical communication, the carrier in the SEFDM system is susceptible to interference between subcarriers, which leads to the divergence of the quadrature amplitude modulation (QAM) constellation at the receiving end, resulting in bit error rate increase. SEFDM technology gives up guaranteeing the orthogonality between sub-carriers, making adjacent waves closer together, thereby further improving the spectral efficiency of the system. Although the SEFDM system has a good ability to improve spectral efficiency, due to the loss of Due to the orthogonality between sub-carriers, the generated signal has very strong inter-sub...
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IPC IPC(8): H04B10/61H04L25/03
CPCH04B10/616H04L25/03318H04L25/03821
Inventor 罗风光陈丹慧杨柳
Owner HUAZHONG UNIV OF SCI & TECH