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District searching method and d device applied to long-period evolution system

A long-term evolution system and cell search technology, which is applied in the field of wireless communication, can solve problems such as high computation load, deterioration of detection performance, complex narrow-band low-pass filter design, etc., and achieve the effect of reducing computation load and avoiding design

Inactive Publication Date: 2010-06-02
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

This implementation method often requires complex narrow-band low-pass filter design and more calculations
Moreover, in the case of a large frequency offset, it is necessary to further increase the amount of calculation several times to solve the frequency offset problem, otherwise its detection performance will deteriorate rapidly

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  • District searching method and d device applied to long-period evolution system
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  • District searching method and d device applied to long-period evolution system

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Embodiment Construction

[0055] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] The present invention first completes the detection of symbol timing and CP mode according to the repetition characteristics of CP data; then performs FFT transformation on each symbol according to the symbol timing, and takes out the data corresponding to the subcarrier position of the main synchronization signal in the frequency domain to detect the main synchronization signal. Determine its location and ID; finally, take out the data of the location of the secondary synchronization signal according to the location of the primary synchronization signal and the CP mode, and complete the detection of the ID of the secondary synchronization signal. At the same time, synchronization estimation and adjustment can be enabled at certain (several) s...

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Abstract

The invention provides district searching method and device applied to a long-period evolution system. The district searching method comprises the following steps of: A, acquiring symbol timing information and CP mode information according to the iterative characteristic of CP data; B, carrying out the fast Fourier transform of NFFT data points in an OFDM symbol according to symbol timing information to obtain frequency domain data of the OFDM symbol; C, extracting a first candidate detection signal from the frequency domain data of the OFDM symbol according to a corresponding subcarrier position of main and secondary synchronous signals in a frequency domain; D, detecting the ID and the position of the main synchronous signal according to the first candidate detection signal and the known main synchronous signal sequence; E, acquiring a second candidate detection signal of the secondary synchronous signal according to the position and the CP mode information of the main synchronous signal, and detecting the ID of the secondary synchronous signal according to the second candidate detection signal and the known secondary synchronous signal sequence, thereby obtaining frame synchronization information. According to the invention, the complicated design of a narrowband low-pass filter can be avoided, and the operand is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a cell search method and device applied to a 3GPP LTE (Long Term Evolution of Third Generation Partnership Project) system. Background technique [0002] The LTE system is an evolution of 3G. It improves and enhances the air access technology of 3G. It adopts Orthogonal Frequency Division Multiplexing (OFDM) and Multiple Input Multiple Output (MIMO) as the only standard for its wireless network evolution. Downlink can provide downlink 100Mbit / s and uplink 50Mbit / s peak rate, which improves the performance of cell edge users, increases cell capacity, and reduces system delay. [0003] The LTE system is a wireless communication system based on OFDM technology, so the OFDM symbol is the basic unit in its frame structure. Specifically, its frame structure is formed step by step as follows: a radio frame is composed of 10 subframes (subframe 0#~9#), each su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/00H04B7/26
Inventor 许百成
Owner ST ERICSSON SEMICON BEIJING
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