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A kind of OFDM training sequence construction and synchronization method

A training sequence and sequence construction technology, applied in the field of OFDM training sequence construction and synchronization, can solve problems such as high peak-to-average ratio, OFDM frequency deviation, affecting OFDM system performance, etc., and achieves elimination of sub-peaks, accurate timing synchronization, and high estimation accuracy. Effect

Active Publication Date: 2018-07-24
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, OFDM has the problems of being susceptible to frequency deviation and high peak-to-average ratio, which seriously affect the performance of OFDM system

Method used

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  • A kind of OFDM training sequence construction and synchronization method
  • A kind of OFDM training sequence construction and synchronization method
  • A kind of OFDM training sequence construction and synchronization method

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Embodiment Construction

[0030] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0031] Embodiments of the present invention relate to an OFDM training sequence construction and synchronization method, such as figure 1 shown, including the following steps:

[0032]

[0033] (2) Use the PN sequence whose length is N / 4 as the weighting factor to partially weight the sequence X, and obtain the training sequence X'=[x' used by the transmitter for synchronization 0 ,x′ 1 ,...,x′ N-1 ],in where p k ,k=0...

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Abstract

The invention relates to an OFDM (Orthogonal Frequency-Division Multiplexing) training sequence construction method and synchronization method, comprising the following steps: a PN (pseudo-noise) sequence is utilized to construct a sequence with a front and back repetition conjugate symmetric structure; weighting treatment is performed on the sequence, and a training sequence with a transmitting terminal used for synchronization is obtained; a receiving terminal defines a timing metric function, and symbol timing synchronization is finished by searching the maximum of the timing metric function; an estimation of fraction frequency offset is obtained by computing a phase difference of two front and back repetition parts of the received training sequence; an estimation of integer frequency offset is finished by utilizing the influence of integer frequency offset on correlated characteristics of a training sequence frequency domain. The OFDM training sequence construction method and synchronization method eliminates the influences of side peaks and peak platforms on synchronization, which are caused by symmetrical structure sequences and cyclic prefixes in a traditional synchronization method, so that the timing synchronization accuracy rate is higher, the estimation of synchronization frequency offset has a smaller error of mean square, and the OFDM training sequence construction method and synchronization method can be effectively used for time and frequency synchronization of an OFDM system in a multipath fading channel.

Description

technical field [0001] The present invention relates to a synchronization method in the field of OFDM technology, in particular to an OFDM training sequence construction and synchronization method. Background technique [0002] Orthogonal Frequency-Division Multiplexing ("OFDM") technology has not only been widely used in the field of broadcast digital audio and video, but also has become a part of the wireless local area network standard and is the fourth generation of mobile communication. key technologies. OFDM is a kind of multi-carrier modulation technology. Its main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interference can be eliminated. There ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/266H04L27/2675
Inventor 张力邱云周杨旭光汪涵王康如李凤荣郑春雷
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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