Demultiplexing algorithm of FBMC-OQAM mode division multiplexing system based on lattice reduction

Abstract

The invention discloses a demultiplexing algorithm of an FBMC-OQAM mode division multiplexing system based on lattice reduction, and belongs to the technical field of communication. The algorithm comprises the following steps of: performing reduction processing on a non-orthogonal channel matrix H obtained by least square (LS) estimation to obtain a quasi-orthogonal matrix and a per-unit mode matrix T; and balancing the received signal by using the quasi-orthogonal matrix to obtain a left multiplication per-unit mode matrix T after quantization judgment, and realizing conversion between the left multiplication per-unit mode matrix T and the left multiplication per-unit mode matrix T to obtain an estimated value of a sent signal. According to the method, the equalization problem of a non-orthogonal channel matrix is converted into the signal processing problem of a quasi-orthogonal matrix through lattice reduction, so that the problem of channel matrix orthogonality degradation caused by MDL is solved, and the method has the characteristics of low calculation complexity and excellent bit error rate performance, has a better demultiplexing effect, and improves the damage compensation performance of an equalization algorithm.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a demultiplexing algorithm of an FBMC-OQAM module division multiplexing system based on a grid-based protocol. 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, the mode-division multiplexing (MDM) technology based on few-mode fiber (FMF) emerged as the times require. Mode-division multiplexing technology achieves exponentially expanded transmission by utilizing the orthogonal modes in few-mode fibers for independent transmission. In MDM systems, there are unique impairments such as mode coupling (MC), differential mode gro...

AI Technical Summary

Problems solved by technology

However, the cyclic prefix (CP) introduced by OFDM will destroy the orthogonality between the signals, making the channels interfere with each other, and the small offset caused by the orthogonality destruction will seriously affect the performance of the system; and the introduction of CP increases the system redundancy. In addition, the performance of the system in terms of spectrum efficiency is greatly reduced, and the OFDM system will also cause serious out-of-band spectrum leakage

Images