Coarse synchronization method for restraining multipath time delay and Doppler effect in LTE-FDD system

A technology of Doppler effect and multipath delay is applied in the field of coarse synchronization of LTE-FDD system to suppress multipath delay and Doppler effect, and can solve problems such as inability to obtain performance.

Inactive Publication Date: 2014-02-12
FUDAN UNIV
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Problems solved by technology

[0007] The function of the coarse synchronization algorithm is to detect and correct fractional carrier frequency deviation and timing deviation. Traditional coarse synchronization algorithms include ML (Maximum Likelihood), MMSE (Minimum Mean Square Error), MC (Maximum Correlation) and S&C (Schmidl&Cox) Algorithm, these four algorithms all use the correlation between the cyclic prefix and effective information to detect, in the case of short cyclic prefix length, these four algorithms can not get good performance

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  • Coarse synchronization method for restraining multipath time delay and Doppler effect in LTE-FDD system
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  • Coarse synchronization method for restraining multipath time delay and Doppler effect in LTE-FDD system

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[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0044] The present invention provides a coarse synchronization method for suppressing multipath delay Doppler effect for LTE-FDD system, and the specific steps are as follows:

[0045] Step 1, store the received signal of a time slot length, define For the received signal before constellation demapping, is the FFT length, , are two cyclic prefix lengths in the LTE system. For 20MHz bandwidth, . A received OFDM symbol is defined as

[0046]

[0047]

[0048] in Indicates that the received a complete OFDM symbol; Indicates the count of received OFDM symbols. In LTE Normal Mode, there are 7 OFDM symbols in a slot, so the length of the sequence that needs to be stored each time is .

[0049] Step 2. Calculate the correlation energy value between the cyclic prefix and the effective information. In order to make full use o...

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Abstract

The invention belongs to the technical field of wireless digital communication, and particularly relates to a coarse synchronization method for restraining the multipath time delay and the Doppler effect in the LTE-FDD system. Coarse synchronization detection is carried out by utilizing a cyclic prefix of an OFDM symbol in a time slot, and the method comprises the steps of signal storage, correlation energy calculation, signal energy calculation, threshold value judgment, starting point judgment, decimal-times carrier frequency offset judgment and the like. A computer conducts simulation display, and the method has the excellent synchronization performance and is suitable for a high-speed mobile wireless communication system. Compared with a traditional correlation detection method, the method has the advantages that the accuracy of decimal-times carrier frequency offset detection can be improved by 10%, and the accuracy of frame starting point detection can be improved by 80%.

Description

technical field [0001] The invention belongs to the technical field of wireless digital communication, and in particular relates to a rough synchronization method for suppressing multipath delay and Doppler effect in an LTE-FDD system. Background technique [0002] The 3GPP organization proposed the 3GPP long-term evolution project (LTE) at the end of 2004. On the basis of the second generation mobile communication system based on time division and frequency division multiple access technology and the third generation mobile communication system based on code division multiple access technology, LTE adopts Orthogonal Frequency Division Multiplexing (OFDM) which belongs to 4G technology OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA) techniques. The good backward compatibility of LTE enables it to benefit from the technical development and latest understanding of HSPA and HSPA+, while LTE can freely adopt the most advanced technology. [0003] The performanc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 陈赟丁娜吴迪曾晓洋
Owner FUDAN UNIV
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