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Cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method in OFDM (Orthogonal Frequency Division Multiplexing) system

A technology of frequency offset estimation and cyclic prefix, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problem of reducing the effective rate and spectrum efficiency of the system, cannot estimate the frequency offset of the integer part, and has no frequency offset estimation method, etc. problem, to achieve the effect of improving spectral efficiency and performance, reducing noise, improving accuracy and system performance

Inactive Publication Date: 2010-11-10
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0011] 1) There is no effective frequency offset estimation method in the existing optical OFDM system
[0012] 2) The existing frequency offset estimation method can only estimate the frequency offset of the fractional part, but cannot estimate the frequency offset of the integer part
In order to obtain accurate frequency offset information, a large number of training sequences are required, which reduces the effective rate and spectral efficiency of the system

Method used

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  • Cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method in OFDM (Orthogonal Frequency Division Multiplexing) system
  • Cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method in OFDM (Orthogonal Frequency Division Multiplexing) system
  • Cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method in OFDM (Orthogonal Frequency Division Multiplexing) system

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Embodiment Construction

[0042] The blind frequency offset estimation method based on cyclic prefix (CP) and virtual carrier in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] see figure 1 , figure 1 It is a schematic diagram of the principle of the blind frequency offset estimation method based on cyclic prefix (CP) and virtual carrier in the present invention. This frequency offset estimation method does not need the assistance of known data such as training sequences, and is a blind frequency offset estimation method. The present invention uses cyclic prefix (CP) to estimate t...

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Abstract

The invention discloses a cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method in an optical OFDM (Orthogonal Frequency Division Multiplexing) system, which can estimate the decimal part and the integral part of the frequency offset at the same time. Without the assist of training sequence and other known data, the cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method improves the effective speed and frequency spectrum efficiency of the system. By adopting a large amount of data of a receiving terminal to carry out blind frequency offset estimation, the method not only can reduce the influence of noise, laser line width and other factors, but also can a trace frequency offset change situation and improve the accuracy of frequency offset estimation and system performance. Moreover, the cyclic prefix (CP) and virtual carrier based blind frequency offset estimation method is applicable to an optical transmission system which adopts the OFDM technology and can be used together with other frequency offset estimation technologies. The invention has the advantages of high practicability, high frequency offset estimation accuracy, simple structure, low cost, low requirement on signal processing and the like.

Description

technical field [0001] The invention relates to a novel blind frequency offset estimation method based on a cyclic prefix (CP) and a virtual carrier in an optical orthogonal frequency division multiplexing (OFDM) system, and belongs to the category of an optical fiber communication system. Background technique [0002] With the rapid development of communication technology, historic changes have taken place in operators' business entities and profit models. People's demand for communication has moved from the initial voice service to multimedia service, and users' demand for network bandwidth is getting higher and higher. In the field of optical communication, a wave of construction of a new generation of optical networks has been launched around the world, paving the way for the development of various value-added services. By 2015, wireless network traffic in developed regions will increase tenfold on the current basis. Whether it is fixed network or mobile network, netwo...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03H04L1/00
Inventor 乔耀军王战胜纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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