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Pilot-assisted CO-FBMC/OQAM system phase noise compensation method

A phase noise compensation and system phase technology, applied in the field of phase noise compensation, can solve problems such as inability to achieve phase compensation effects, and achieve high tolerance, high application value, and low computational complexity

Active Publication Date: 2021-08-24
ZHEJIANG UNIV OF TECH
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Problems solved by technology

When the linewidth of the laser is small, the influence of ICI is also small, so it can be ignored. However, when the linewidth of the laser increases, the phase noise increases, and the ICI cannot be ignored. At this time, only compensating for CPE cannot achieve a good phase compensation effect

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  • Pilot-assisted CO-FBMC/OQAM system phase noise compensation method
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  • Pilot-assisted CO-FBMC/OQAM system phase noise compensation method

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Embodiment Construction

[0074] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings.

[0075] combine Figure 1 to Figure 10 , a pilot-assisted CO-FBMC / OQAM system phase noise compensation method, said method comprising the following steps:

[0076] (1) Signal processing at the sending end: 4 / 16 / 64QAM mapping is performed on the data respectively to obtain a complex signal X=X I +jX Q , and then the complex symbol is preprocessed by OQAM to obtain the PAM symbol a m,n ∈{X I ,X Q}, where m=0,1,2,...,M-1,n=0,1,2,...,Ns-1, M represents the number of subcarriers, Ns represents the number of FBMC symbols, where a u,n , a v,n Set as pilot data, u and v are any two subcarriers, in order to avoid adverse effects on the pilot-aided phase noise compensation algorithm, the two subcarrier data adjacent to the two subcarriers are also set to 0, that is, a u+1,n =a u-1,n = 0; a v+1,n =a v-1,n =0, PAM symbol data obtains the base...

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Abstract

The invention discloses a pilot-assisted phase noise compensation method in a CO-FBMC / OQAM system, and the method comprises the steps: carrying out the compensation of CPE noise of data at a receiving end based on pilot data through employing an extended Kalman filter (EKF) algorithm, and carrying out the pre-judgment after the compensation; then selecting data within a proper range after CPE compensation, recording the position of the data, and taking the pre-judged data as a data estimation value symbol of a transmitting end for later use; and then, constructing a DCT primary function, carrying out approximate estimation on the phase noise, establishing a DCT time domain model of the phase noise, obtaining a DCT coefficient by using LS estimation, and carrying out more accurate compensation on the phase noise in a time domain. According to the invention, the system has higher tolerance to the phase noise generated by the laser, and the calculation complexity of the algorithm is low.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and in particular relates to a phase noise compensation method in a coherent optical filter bank multi-carrier / offset quadrature amplitude modulation system. Background technique [0002] Coherent Optical-offset Quadrature Amplitude Modulation-based filterbank multicarrier (CO-FBMC / OQAM Coherent Optical-offset Quadrature Amplitude Modulation-based filterbank multicarrier) system no longer needs Adding a cyclic prefix and a guard band, compared with the traditional multi-carrier coherent optical orthogonal frequency division multiplexing (Coherent Optical-Orthogonal Frequency Division Multiplexing, OFDM) system, it has the advantages of low out-of-band radiation and high spectral efficiency, and is considered to be multi- One of the future development directions of carrier optical transmission technology. [0003] A typical CO-FBMC / OQAM system structure is as follows figure 1 As shown,...

Claims

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Application Information

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IPC IPC(8): H04B10/61H04L27/26H04L25/02
CPCH04B10/6165H04L27/264H04L27/2697H04L27/261H04L25/0224
Inventor 杨琛卢瑾任宏亮覃亚丽乐孜纯
Owner ZHEJIANG UNIV OF TECH
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