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Training sequence structure and synchronization algorithm suitable for OFDM time synchronization

A technology of training sequence and synchronization algorithm, which is applied in the field of OFDM, can solve the problems of reducing training sequence energy and anti-multipath interference performance, and achieve the effect of improving efficiency

Inactive Publication Date: 2010-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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Problems solved by technology

However, due to the reduction of the energy of the training sequence in this series of methods, the performance of anti-multipath interference has declined.

Method used

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  • Training sequence structure and synchronization algorithm suitable for OFDM time synchronization
  • Training sequence structure and synchronization algorithm suitable for OFDM time synchronization
  • Training sequence structure and synchronization algorithm suitable for OFDM time synchronization

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Embodiment Construction

[0032] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0033] Step 1: Set the number of subcarriers in the OFDM system to be 1024, and the length of the cyclic prefix to be 128 bits. The original serial data forms parallel data through module 1. After each group of data is encoded by RS in module 2, it is QPSK modulated and mapped; the data is subjected to IFFT operation in the OFDM baseband modulation module and a cyclic prefix corresponding to the data is generated; the selection period is N pn = 31 m-sequence, the last bit is filled with 0 to form a code sequence with a length of 32, the originator takes the negative value of the code sequence and places it behind the original code sequence, and then copies the above two sets of code sequences to form the following figure 2 The training sequence of the structure shown is denoted as m(k), k∈[0, 127]; the training sequence is multiplied by ρ=0...

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Abstract

The invention provides a new method for OFDM time synchronization, which is based on a training sequence structure and a corresponding synchronization algorithm. A method of superimposing the OFDM synchronization training sequence to cyclic prefixes of transmission data is used for saving extra transmission cost; relevant peak value is more prominent by combing the training sequence structure and utilizing positive and negative alternating characteristic of the training sequence. Both the synchronization accuracy and the operating speed of the algorithm are increased by combining the corresponding synchronization algorithm.

Description

technical field [0001] The invention relates to the technical field of OFDM, in particular to a method for time synchronization by superimposing training sequences. Background technique [0002] OFDM is a single-user multi-carrier modulation method. Its basic principle is to convert serial high-speed data signals into parallel low-speed sub-data streams, and then use a sub-channel composed of a group of sub-carriers orthogonal to each other to transmit each Substream. The spectrum of OFDM sub-channels is overlapping and orthogonal, so OFDM is a modulation method with high spectral efficiency. Compared with the traditional equalizer, its biggest feature is its simple structure, so it can greatly reduce the cost, and it is very flexible in practical applications, especially for high-speed digital communication. It is a very promising technology. [0003] However, there are technical difficulties in realizing the OFDM system, one of which is that the system has high requireme...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 罗仁泽高頔伍晓琼刘盈黄家盛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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