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OFDM synchronization method based on four dimensional chaos system

A chaotic system and four-dimensional technology, applied in the direction of multi-frequency code system, etc., can solve the problems of inaccurate symbol synchronization and carrier synchronization, small range of frequency offset estimation, high computational complexity, etc., to achieve accurate symbol synchronization and frequency synchronization, frequency offset Estimate the effect of large range and low computational complexity

Inactive Publication Date: 2009-03-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0009] The purpose of the present invention is to propose an OFDM synchronization method based on a four-dimensional chaotic system to solve the problems of high computational complexity, small frequency offset estimation range, inaccurate symbol synchronization and carrier synchronization, and low security intensity in the current OFDM synchronization method

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  • OFDM synchronization method based on four dimensional chaos system
  • OFDM synchronization method based on four dimensional chaos system
  • OFDM synchronization method based on four dimensional chaos system

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[0033] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0034] According to the document organized by 3GPP: TR25.892V6.0.0, "Feasibility Study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement (Release 6)", consider the following OFDM parameter settings: the system bandwidth B is 6.528Mhz, and the number of subcarriers N is 1024 , the subcarrier spacing is 6.375Khz, the length of the cyclic prefix cp is 100, the length of the training sequence is 1024 (ie m=128, L=8), the symbol period T u It is 156.86+15.32+156.86=329.04us, the modulation method is QPSK, the channel is AWGN channel and Rayleigh multipath fading channel, and the mean square error (MSE) is used to measure the performance of the algorithm. It should be noted that the above parameter...

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Abstract

The invention belongs to the technical field of mobile communication and discloses an OFDM synchronization method based on a four-dimensional chaotic system. The OFDM synchronization method proposed based on the four-dimensional chaotic system comprises the following steps: construction of the four-dimensional chaotic system, symbol synchronization, crude frequency deviation estimation and fine frequency deviation estimation, wherein the constructed four-dimensional chaotic system has a typical chaotic attractor; the symbol synchronization is achieved by a multi-symbol determination threshold method; the crude frequency deviation estimation is achieved by adopting sequence relativity operation; and the fine frequency deviation estimation is achieved by a synchronization method based on a cyclic prefix. The dynamic behavior of the constructed chaotic system is difficult to be predicted, the system is extremely sensitive to an initial value, and the generated chaotic sequence has good relativity. The synchronization method based on the system has the advantages of low calculation complexity, large frequency deviation estimation range, accurate symbol synchronization and frequency synchronization, high security, etc.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to an OFDM synchronization method based on a four-dimensional chaotic system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) technology has attracted more and more attention because of its high data transmission rate, strong resistance to multipath interference and narrowband interference, and high spectrum utilization. It has been successfully used in wired and wireless communications. Such as: DAB (Digital Audio Broadcasting), DVB (Digital Video Broadcasting), IEEE802.11a, HIPERLAN / 2, ADSL (Asymmetric Digital Subscriber Line) and so on. The OFDM modulation technology is being gradually applied to the new generation of mobile communication systems, which will greatly improve the transmission data rate and spectrum efficiency of the new generation of mobile communication systems, and has a goo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 唐良瑞孙毅樊冰左琪陆俊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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