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Time and frequency synchronization method and time and frequency synchronization device in LTE communication system

A time-frequency synchronization, wireless communication system technology, applied in the field of time-frequency synchronization methods and devices, achieves the effect of low complexity and satisfying performance requirements

Active Publication Date: 2013-10-30
MARVELL ASIA PTE LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the problems existing in the prior art, the present invention provides a technical solution for time-frequency synchronization in the LTE communication system to overcome the large frequency deviation

Method used

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  • Time and frequency synchronization method and time and frequency synchronization device in LTE communication system
  • Time and frequency synchronization method and time and frequency synchronization device in LTE communication system
  • Time and frequency synchronization method and time and frequency synchronization device in LTE communication system

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Embodiment Construction

[0043] figure 1 The possible correlation values ​​of the PSS sequence under the frequency offset and the timing offset in the prior art are schematically shown, which have been described above.

[0044] According to an embodiment of the present invention, a technical solution for time-frequency synchronization in a time-division LTE wireless communication system is provided, in which OFDM symbol timing is used to assist in estimating the timing and frequency offset estimation value of the main synchronization signal, thereby overcoming large frequency The estimation error caused by bias.

[0045] figure 2 It schematically shows a processing flowchart of a method for time-frequency synchronization in a wireless communication system according to an embodiment of the present invention.

[0046] Such as figure 2 As shown, in step S110, cyclic prefix correlation (Cyclic prefix correlation) is used to determine the orthogonal frequency division multiplexing OFDM symbol timing and the fr...

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Abstract

The implementation mode of the invention provides a time and frequency synchronization method in a wireless communication system, which comprises the steps of carrying out the symbol timing estimation and the fine frequency estimation on received signals based on the Orthogonal Frequency Division Multiplexing (OFDM) technique; carrying out the timing estimation on the Packet Switching Service (PSS) through the matched filtering of the received signals; determining at least two continuous OFDM symbols as candidate OFDM symbols containing the PSS; shifting the candidate OFDM symbols compensated by the fine frequency estimation into a frequency domain; carrying out the cyclic shift channel estimation on the corresponding sub-carriers of each candidate OFDM symbol of the at least two candidate OFDM symbols; shifting the cyclic shift channel estimation result of each candidate OFDM symbol into a time domain; figuring out the energy value of each sampling point according to the time-domain channel impulse response of each integer-frequency-offset value; and determining the OFDM signals containing the PSS and the calculated value of the integer-frequency-offset value based on the energy maximum principle.

Description

[0001] Cross references to related applications [0002] This application claims the priority of U.S. Provisional Application No. 61 / 638,047 filed on April 25, 2012, the disclosure of which is incorporated herein by reference in its entirety. Technical field [0003] The embodiments of the present invention relate to the field of wireless communication, and more specifically to a time-frequency synchronization method and device in an LTE communication system. Background technique [0004] In a long-term evolution (LTE) communication system, when a user equipment (UE) is powered on and wants to access the LTE network, it must initiate a cell search process. The process includes a series of synchronization steps through which the UE can determine the cell identity (ID ) And the timing and frequency parameters necessary for demodulating the downlink and obtaining certain key system information. [0005] In LTE, the cell search process is based on two specific synchronization signals bro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 盛渊李茜刘石王庆文
Owner MARVELL ASIA PTE LTD
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