Detection method and device of downlink primary synchronization signals in LTE system

A technology of master synchronization signal and detection method, which is applied in the direction of transmission system, multi-frequency code system, digital transmission system, etc., can solve the problem of poor detection performance of downlink master synchronization signal, and achieve the effect of guaranteed detection

Inactive Publication Date: 2016-08-10
北京裕源大通科技股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0009] The main purpose of the present invention is to provide a method and device for detecting the downlink primary synchronization signal in the LTE system, so as to solve the problem of poor detection performance of the downlink primary synchronization signal in the LTE system when the carrier frequency is greatly shifted in the prior art. question

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  • Detection method and device of downlink primary synchronization signals in LTE system
  • Detection method and device of downlink primary synchronization signals in LTE system
  • Detection method and device of downlink primary synchronization signals in LTE system

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Embodiment 1

[0044] figure 1 It is a flowchart of a method for detecting a downlink primary synchronization signal in an LTE system according to a first embodiment of the present invention, such as figure 1 As shown, the method includes the following steps S102 to S116.

[0045] Step S102: pre-add a frequency offset value to the received sequence X(n), and synthesize a set of sequences Y(n).

[0046] Among them, the sequence X(n) is a set of downlink IQ data received in the LTE system, and n is the length of the data sequence. After receiving the sequence X(n), a preset frequency offset is added to it through this step value, mixes sequence X(n) into sequence Y(n).

[0047] Specifically, the frequency offset value M is input into a DDS (Direct Digital Frequency Synthesizer) module to perform frequency offset correction for X(n). Among them, the DDS module is to simulate the function of the DDS chip, realize the phase modulation of the receiving sequence X(n), so as to obtain a new set o...

Embodiment 2

[0067] This embodiment is a further preferred method for detecting the downlink primary synchronization signal in the LTE system on the basis of the first embodiment, see figure 2 , the method is described in detail as follows.

[0068] The first step, generation of local sequences:

[0069] Because the Zadoff-Chu sequence has a good correlation between the frequency domain and the time domain. In this embodiment, the local sequence is generated by the Zadoff-Chu sequence in the frequency domain, and the specific method is as follows:

[0070]

[0071] Among them, u is the subscript of the root sequence of Zadoff-Chu, u=25, 29, 34, according to the value of u, three sets of 62-point local sequences are generated respectively, and then the first 31 sequences are recorded as d0(n), The last 31 sequences are denoted as d1(n). Because DC does not transmit any information, the middle of the sequence needs to be filled with zeros. For the convenience of calculation, the sequ...

Embodiment 3

[0091] Corresponding to the method for detecting the downlink primary synchronization signal in the LTE system provided in Embodiment 1 of the present invention, the embodiment of the present invention also provides a detection device for the downlink primary synchronization signal in the LTE system, see Figure 8 , the device may include a frequency offset processing module 10 , a low-pass filter 20 , a sliding correlation module 30 , a peak search module 40 and a master synchronization signal location module 50 .

[0092] The frequency offset processing module 10 is used to pre-add a frequency offset value to the received sequence X(n), and synthesize a set of sequence Y(n), where n is the length of the data sequence, and the sequence X(n) is the downlink frequency in the LTE system. data;

[0093] A low-pass filter 20, configured to low-pass filter the sequence Y(n) to obtain the sequence Z(n);

[0094] The sliding correlation module 30 is used to extract the sequence Z(n)...

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Abstract

The invention discloses a detection method and device of downlink primary synchronization signals in an LTE system. The method includes the following steps that: a frequency deviation value is pre-added to a receiving sequence X (n), so that a sequence Y (n) can be formed through combination; the sequence Y (n) is processed by a low-pass filter, so that a sequence Z (n) can be formed; x-times extraction is performed on the sequence Z (n), m sets of data sequences of which the length is y can be generated; z sets of sequences are selected from the m sets of data sequences, and sliding correlation is performed on the z sets of sequences and one set of local sequence; a maximum value is found out in all operation results of the sliding correlation, the maximum value is compared with a preset threshold value; if the maximum value is larger than the preset threshold value, the maximum value is a correlation peak value, and a time counter is zeroed; if the maximum value is smaller than or equal to the preset threshold value, and the counting of the time counter achieves a full frame cycle, the frequency deviation value is updated, and the correlation peak value is searched again; and the primary synchronization signals are positioned according to the correlation peak value. With the detection method and device of the invention adopted, when large frequency deviation occurs on a system, frequency deviation correction is automatically carried out, and detection of the PSS (primary synchronization signals) can be ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular, to a method and device for detecting a downlink primary synchronization signal in an LTE system. Background technique [0002] LTE (Long Term Evolution, Long Term Evolution) is the next-generation mainstream mobile communication standard in the world following the third-generation mobile communication. It has the characteristics of high transmission rate and high spectrum utilization rate. When the user terminal (UE) accesses the LTE network, it must first go through the cell search to obtain time and frequency synchronization, and at the same time identify some information such as the label of the cell and the broadcast of the cell. [0003] In order to realize the cell search, the downlink of the LTE system defines two synchronization sequences, respectively primary synchronization sequence (PSS) and secondary synchronization sequence (SSS). For TDD-LTE, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00H04B1/7087
CPCH04B1/7087H04L27/0014H04L27/2657H04L2027/0026
Inventor 刘星于宏图樊利勇
Owner 北京裕源大通科技股份有限公司
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