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Initial cell searching method of LTE (Long Term Evolution) under high-speed mobile condition

A cell search, high-speed mobile technology, applied in electrical components, access restrictions, wireless communication and other directions, can solve the problems of communication quality impact, destruction of sub-carrier orthogonality, weak robustness of cell search algorithm, etc. The effect of algorithmic complexity

Inactive Publication Date: 2010-11-10
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, in the specific scenario of high-speed railway, due to the Doppler effect caused by high-speed movement and fast channel fading, the orthogonality between subcarriers will be destroyed, which will greatly affect the communication quality.
Most of the existing cell search algorithms are aimed at low-speed scenarios, and the robustness of the cell search algorithms is not strong in the presence of Doppler

Method used

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  • Initial cell searching method of LTE (Long Term Evolution) under high-speed mobile condition
  • Initial cell searching method of LTE (Long Term Evolution) under high-speed mobile condition
  • Initial cell searching method of LTE (Long Term Evolution) under high-speed mobile condition

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Embodiment Construction

[0028] Such as figure 1 As shown, the LTE cell search in the high-speed mobile scenario mainly includes the following steps:

[0029] Step 101: Obtain the position of the primary synchronization signal (PSS) in the receiving sequence and the cell ID number;

[0030] LTE stipulates three kinds of cell ID numbers, and the information is transmitted by the PSS, and the three kinds of cell ID numbers are distinguished by transmitting three different PSSs. In this step, while the timing information is obtained through modulus correlation, the maximum point in the three correlation sets can be judged to obtain the cell ID number.

[0031] According to the specific zc sequence generation formula of the primary synchronization signal (PSS), three groups of 62-bit long zc sequences are generated respectively, and zero-padded to 2048 points.

[0032] The three local frequency domain sequences are converted to the time domain through inverse fast Fourier transform (IFFT), and are to be...

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Abstract

The invention provides an initial cell searching method of LTE (Long Term Evolution) under a high-speed mobile condition, comprising the following steps of: acquiring the position of a master synchronous signal and the ID number of a cell in a receiving sequence; carrying out frequency offset estimation and compensating, and demodulating the master synchronous signal to a frequency domain; carrying out channel estimation by utilizing the data information of the master synchronous signal; and carrying out coherent demodulation on an auxiliary synchronous signal according to the ID number of the cell and the channel estimation result of the master synchronous signal to acquire the ID group number of the cell. In a high-speed mobile specific scene, downlink synchronization is simply and quickly acquired by using the method, and the frequency offset can be estimated. Although the method has some restrained conditions, the conditions can be satisfied in the specific scene, and the algorithm complexity can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a cell search method for LTE under high-speed mobile conditions. Background technique [0002] 3GPP Long Term Evolution (LTE) is the largest research and development project launched by 3GPP in recent years. This technology takes OFDM / OFDMA as the core and is regarded as "quasi-4G technology". LTE will have a qualitative improvement over the current 3G system in terms of transmission rate and service quality. [0003] For a cellular mobile communication system, cell search is a very critical process. It is the premise for communication between a user (User Equipment, UE) and a base station (Base Station, BS), and it is also what the UE wants to achieve in its cell. The first step in communication. The so-called cell search refers to a process in which the UE detects an ideal cell and obtains time and frequency synchronization with it. The cell search we a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/16
Inventor 袁伟陶成刘留邱佳慧张令文张秀宁孙溶辰
Owner BEIJING JIAOTONG UNIV
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