A Damage Compensation Method for Module Division Multiplexing System Based on Lattice Reduction

Abstract

The invention discloses a lattice reduction-based mode division multiplexing system damage compensation method, belonging to the technical field of communication. The method comprises the steps of first, performing reduction processing on a non-orthogonal channel matrix H estimated through LS, so as to obtain an almost orthogonal matrix H~ and a unimodular matrix T, then balancing a received signal by using the almost orthogonal matrix H~ so as to obtain c^, and finally quantifying and determining c^, then left multiplying the unimodular matrix T, so as to realize conversion between c^ and s^to obtain an estimation value of a sent signal. A balance problem of a non-orthogonal channel matrix is changed into a signal processing problem of the almost orthogonal matrix through lattice reduction, so that channel matrix orthogonality deterioration caused by MDL is solved, and the damage compensation performance of the balance algorithm is improved. Quasi-orthogonalization is performed on the channel matrix through the lattice reduction algorithm, the damage caused by MDL is compensated effectively, and the method has the characteristics of low calculation complexity and good bit error rate performance and has good de-multiplexing effect.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a damage compensation method for a module division multiplexing (MDM) system, which uses a lattice-based algorithm to realize the demultiplexing of the MDM system. Background technique [0002] With the rapid development of the information society, the global data traffic has exploded at a rate of more than 50% every year, and the capacity of traditional single-mode optical fiber communication systems has gradually approached the nonlinear Shannon limit. As a new expansion technology that can break through the capacity bottleneck of single-mode fiber, mode-division multiplexing (MDM) based on few-mode fiber (FMF) emerged as the times require. Mode-division multiplexing technology achieves double capacity expansion transmission by using the orthogonal mode in the few-mode fiber for independent transmission. In MDM systems, there are unique impairments such as mode coupling (...

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Problems solved by technology

[0003] Aiming at the problem that the existing technology cannot effectively compensate for the damage compensation of the MDM system under the condition of MDL, the present invention provides a method for damage compensation of the MDM system based on the lattice-based protocol. Compared with the prior art, this method only uses digital signals in the electrical domain The processing technology can realize the damage compensation under the condition of MDL, and the calculation complexity is low, and the damage compensation effect is excellent, which can effectively improve the system's tolerance value for MDL, improve the orthogonality of the transmission matrix, and promote the development of long-distance and large-capacity optical networks. development is important

That is, through lattice reduction, the equalization problem of non-orthogonal channel matrix is ​​transformed into the signal processing problem of quasi-orthogonal matrix (such as figure 1 shown), thus solving the problem of channel matrix orthogonality degradation caused by MDL, and improving the damage compensation performance of the equalization algorithm

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