WO2021128782A1 - 一种nbiot的频域时频同步方法 - Google Patents
一种nbiot的频域时频同步方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2672—Frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Definitions
- the present invention relates to the field of NB-IoT communication technology, and particularly relates to a time-frequency synchronization method of an NB-IoT system.
- Narrow Band Internet of Things (NB-IoT, Narrow Band Internet of Things) is a cellular communication system with low power consumption, low cost, large capacity, and wide coverage. People's attention.
- the first step of NB IoT communication is the initial synchronization process, including obtaining time synchronization and frequency synchronization.
- the existing synchronization method uses the terminal to construct the time domain master synchronization signal locally, using the correlation of the time domain master synchronization sequence with each time point.
- the time point of the signal with high cross-correlation is considered to be the main synchronization, it is limited by the complexity of the implementation.
- the coarse time frequency synchronization at the sampling rate of 240KH is used in the time domain, and then 1.92MHz Fine time and frequency synchronization at the sampling rate. If a large frequency offset needs to be captured, several master synchronization signals with frequency offsets need to be prepared locally for time cross-correlation. This method consumes a lot of cross-correlation calculations and is complicated.
- the purpose of the present invention is to provide a frequency-domain time-frequency synchronization method that can obtain accurate time synchronization and frequency synchronization NBIOT by sampling different sub-carrier signals and using only one cross-correlation operation. It adopts the following technical solutions:
- a NBIOT frequency domain time-frequency synchronization method which includes the following steps:
- each set of data includes 11 pieces of data, and each piece of data is 128 points in length, and performs 8 times lower secondary down-sampling and performs 16-point FFT to get the frequency domain signal;
- S30 Fetch 5 types of frequency domain data from the frequency domain signal according to 5 different subcarrier offset modes, and each type of frequency domain data includes 11 frequency domain subcarrier data;
- step S10 specifically includes:
- the data sample point form of the secondary downsampling in the step S20 is as follows:
- n 0, 1, 2
- the frequency domain signal D m,k,i obtained after FFT is:
- the frequency domain data Y m, k, b, j taken from the frequency domain signal D m, k, i in the step S30 is expressed as:
- the cross-correlation result data is C m,k,b :
- the result to be determined is ⁇ m,b :
- ⁇ ⁇ is the weighting coefficient
- Is the t-1th time delay autocorrelation result
- ⁇ is the IIR filter coefficient
- the NB-IoT synchronization information obtained in step S60 is:
- the fractional frequency offset is calculated as follows:
- T is the symbol length
- the final frequency offset is expressed as:
- the frequency-domain time-frequency synchronization method of the NBIOT of the present invention cleverly obtains sub-carrier signals with different frequency offsets by sampling sub-carrier signals at different positions in the frequency domain, and can obtain precise time synchronization and frequency synchronization with only one cross-correlation operation.
- the frequency-domain correlation method can suppress out-of-band interference to the greatest extent and improve the detection ability of the weak signal of the system.
- frequency domain correlation technology is adopted, which has better autocorrelation performance and lower mutual performance than time domain correlation, thereby increasing detection reliability.
- the method can perform initial synchronization in the frequency domain for cells in a scene with a low signal-to-noise ratio and a large frequency offset, and complete coarse synchronization and fine synchronization at one time, thereby realizing a complete cell synchronization process.
- the calculation process is simplified, the calculation time is saved, and the calculation efficiency is improved.
- Fig. 1 is a flowchart of a frequency domain time-frequency synchronization method of NBIOT in an embodiment of the present invention.
- a frequency domain time-frequency synchronization method of NBIOT includes the following steps:
- each set of data includes 11 pieces of data, and each piece of data is 128 points in length, and performs 8 times lower secondary down-sampling and performs 16-point FFT to get the frequency domain signal;
- the data sample form of the secondary downsampling is as follows:
- n 0, 1, 2
- the frequency domain signal D m,k,i obtained after FFT is:
- S30 Fetch 5 types of frequency domain data from the frequency domain signal according to 5 different subcarrier offset modes, and each type of frequency domain data includes 11 frequency domain subcarrier data;
- the frequency domain data Y m, k, b, j taken from the frequency domain signal D m, k, i is expressed as:
- i b mod([b, b+1,..., b+4, b+10, b+11,..., b+15], 16),
- the cross-correlation result data is C m,k,b :
- ⁇ ⁇ is the weighting coefficient
- Is the t-1th time delay autocorrelation result
- ⁇ is the IIR filter coefficient
- the obtained NB-IoT synchronization information is:
- fractional frequency offset is calculated as follows:
- T is the symbol length
- the final frequency offset is expressed as:
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Abstract
本发明公开了一种NBIOT的频域时频同步方法,包括:进行一次采样,并和本地的时域PSS做匹配滤波后寻找前3大峰值及其对应的3个位置;分别以3个位置为起始位置,从一次采样的数据中取三组数据,二次降采样并作16点FFT得到频域信号;按照5种不同的子载波偏移方式从频域信号中取5种频域数据;将5种频域数据和本地频域PSS信号互相关,得到互相关结果数据;将互相关结果数据做延时滑动自相关并加权累加,得到待判决结果;在待判决结果中找到最大值并和门限比较,超过门限则得到NB-IoT同步信息;取过门限的峰值位置数据,计算频偏,完成小区时频同步。本发明能够在频域对低信噪比大频偏的场景下的小区进行初始同步,并且一次完成粗同步和精细同步。
Description
本发明涉及NB-IoT通信技术领域,特别涉及NB-IoT系统的时频同步方法。
窄带物联网(NB-IoT,Narrow Band Internet of Things)是低功耗、低成本、大容量、广覆盖的蜂窝通信系统,并且伴随着大规模物联网需求的产生及不断发展,越来越受到人们的关注。
NB IoT通信的第一步是初始同步过程,包括获得时间同步和频率同步,现有的同步方法通过终端在本地构造时域主同步信号,利用时域主同步序列的相关性与每个时间点的接收信号进行互相关,互相关性高的信号所在的时间点认为是主同步时,受限于实现的复杂度,一般在时间域采用240KH采样率下的粗时间频率同步,然后是1.92MHz采样率下的精细时间和频率同步。如果需要捕获较大的频率偏移需要在本地准备数个带有频率偏移的主同步信号进行时间互相关,这种方法会消耗大量的互相关运算运算复杂。
发明内容
针对现有技术的不足,本发明目的在于提供一种通过取样不同子载波信号,只采用一次互相关运算就能得到精确的时间同步和频率同步NBIOT的频域时频同步方法。其采用如下技术方案:
一种NBIOT的频域时频同步方法,其包括以下步骤:
S10、接收1.92MHz采样信号,进行8倍下一次采样,并和本地的时域PSS做匹配滤波后寻找前3大峰值及其对应的3个位置;
S20、分别以所述3个位置为起始位置,从一次采样的数据中取三组数据,每组数据包括11段数据,每段数据长128点,进行8倍下二次降采样并作16点FFT得到频域信号;
S30、按照5种不同的子载波偏移方式从所述频域信号中取5种频域数据,每种频域数据包括11个频域子载波数据;
S40、将所述5种频域数据和本地频域PSS信号互相关,得到互相关结果数据;
S50、将所述互相关结果数据做延时滑动自相关并加权累加,得到待判决结果;
S60、在所述待判决结果中找到最大值并和门限比较,超过门限则得到NB-IoT同步信息;
S70、取过门限的峰值位置数据,计算小数倍频偏,完成小区时频同步。
作为本发明的进一步改进,所述步骤S10具体包括:
S11、缓存1.92MHz信号r
n,n=0,1,..,19200-1,同时对r
n进行8倍下采样得到r
m′,m′=0,1,...2400-1;
S12、记本地PSS时域信号为s
m,m=0,1,..,187,r
m′和s
m做匹配滤波结果记为q
m,m=0,1,2400-1;
S13、从q
m中找出前3大峰值对应的位置记为p
n,n=0,1,2。
作为本发明的进一步改进,所述步骤S20中二次降采样的数据样点形式如下:
l
k=m+137k+9+(k=3)+(k>3)+8i,
k=0,1,...10,
i=0,...,15,
m=8p
n-40,..,8p
n+40,
n=0,1,2
在作FFT后得到的频域信号D
m,k,i为:
D
m,k,j=FFT(d
m,k,i),
i=0,1,...,15;j=0,1,...,15。
作为本发明的进一步改进,所述步骤S30中从所述频域信号D
m,k,i取的频域数据Y
m,k,b,j表示为:
i
b=mod([b,n+1,...,b+4,b+10,b+11,...,b+15],16),
b=0,+1,-1,+2,-2
j=0,1,...10。
作为本发明的进一步改进,所述互相关结果数据为C
m,k,b:
其中,L
k,j是本地存储的带扰码的PSS频域信号,k=0,1,...10,j=0,1,...10。
作为本发明的进一步改进,所述待判决结果为ρ
m,b:
作为本发明的进一步改进,所述步骤S60中得到NB-IoT同步信息为:
作为本发明的进一步改进,所述小数倍频偏计算如下:
其中T为符号长度;
最终的频率偏移表示为:
其中,
本发明的有益效果:
本发明NBIOT的频域时频同步方法通过在频域取样不同位置的子载波信号,巧妙的得到不同频偏的子载波信号,只采用一次互相关运算就能得到精确的时间同步和频率同步。通过频域相关的方法能够最大限度抑制带外干扰,提高系统微弱信号的检测能力。同时采用频域相关技术,比采用时域相关拥有更好的自相关性能和低的互相性能,从而增加检测可靠性。该方法能够在频域对低信噪比大频偏的场景下的小区进行初始同步,并且一次完成粗同步和精细同步,实现完整小区同步过程。简化了运算过程,节省了运算时间,提高了运算效率。
上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段,而可依照说明书的内容予以实施,并且为了让本发明的上述和其他目的、特征和优点能够更明显易懂,以下特举较佳实施例,并配合附图,详细说明如下。
图1是本发明中实施例中NBIOT的频域时频同步方法的流程图。
下面结合附图和具体实施例对本发明作进一步说明,以使本领域的技术人员可以更好地理解本发明并能予以实施,但所举实施例不作为对本发明的限定。
实施例
如图1所示,一种NBIOT的频域时频同步方法,其包括以下步骤:
S10、接收1.92MHz采样信号,进行8倍下一次采样,并和本地的时域PSS做匹配滤波后寻找前3大峰值及其对应的3个位置;具体包括:
S11、缓存1.92MHz信号r
n,n=0,1,..,19200-1,同时对r
n进行8倍下采样得到r
m′,m′=0,1,...2400-1;
S12、记本地PSS时域信号为s
m,m=0,1,..,187,r
m′和s
m做匹配滤波结果记为q
m,m=0,1,2400-1;
S13、从q
m中找出前3大峰值对应的位置记为p
n,n=0,1,2。
S20、分别以所述3个位置为起始位置,从一次采样的数据中取三组数据,每组数据包括11段数据,每段数据长128点,进行8倍下二次降采样并作16点FFT得到频域信号;
其中,二次降采样的数据样点形式如下:
l
k=m+137k+9+(k==3)+(k>3)+8i,
k=0,1,...10,
i=0,...,15,
m=8p
n-40,..,8p
n+40,
n=0,1,2
在作FFT后得到的频域信号D
m,k,i为:
D
m,k,j=FFT(d
m,k,i),
i=0,1,...,15;j=0,1,...,15。
S30、按照5种不同的子载波偏移方式从所述频域信号中取5种频域数据,每种频域数据包括11个频域子载波数据;
其中,从所述频域信号D
m,k,i取的频域数据Y
m,k,b,j表示为:
i
b=mod([b,b+1,...,b+4,b+10,b+11,...,b+15],16),
b=0,+1,-1,+2,-2
j=0,1,...10。
S40、将所述5种频域数据和本地频域PSS信号互相关,得到互相关结果数 据;
具体的,互相关结果数据为C
m,k,b:
其中,L
k,j是本地存储的带扰码的PSS频域信号,k=0,1,...10,j=0,1,...10。
S50、将所述互相关结果数据做延时滑动自相关并加权累加,得到待判决结果;
具体的,待判决结果为ρ
m,b:
S60、在所述待判决结果中找到最大值并和门限比较,超过门限则得到NB-IoT同步信息;
具体的,得到NB-IoT同步信息为:
S70、取过门限的峰值位置数据,计算小数倍频偏,完成小区时频同步。
具体的,小数倍频偏计算如下:
其中T为符号长度;
最终的频率偏移表示为:
其中,
以上实施例仅是为充分说明本发明而所举的较佳的实施例,本发明的保护范围不限于此。本技术领域的技术人员在本发明基础上所作的等同替代或变换,均在本发明的保护范围之内。本发明的保护范围以权利要求书为准。
Claims (8)
- 一种NBIOT的频域时频同步方法,其特征在于,包括以下步骤:S10、接收1.92MHz采样信号,进行8倍下一次采样,并和本地的时域PSS做匹配滤波后寻找前3大峰值及其对应的3个位置;S20、分别以所述3个位置为起始位置,从一次采样的数据中取三组数据,每组数据包括11段数据,每段数据长128点,进行8倍下二次降采样并作16点FFT得到频域信号;S30、按照5种不同的子载波偏移方式从所述频域信号中取5种频域数据,每种频域数据包括11个频域子载波数据;S40、将所述5种频域数据和本地频域PSS信号互相关,得到互相关结果数据;S50、将所述互相关结果数据做延时滑动自相关并加权累加,得到待判决结果;S60、在所述待判决结果中找到最大值并和门限比较,超过门限则得到NB-IoT同步信息;S70、取过门限的峰值位置数据,计算小数倍频偏,完成小区时频同步。
- 如权利要求1所述的NBIOT的频域时频同步方法,其特征在于,所述步骤S10具体包括:S11、缓存1.92MHz信号r n,n=0,1,..,19200-1,同时对r n进行8倍下采样得到r m′,m′=0,1,...2400-1;S12、记本地PSS时域信号为s m,m=0,1,..,187,r m′和s m做匹配滤波结果记为q m,m=0,1,2400-1;S13、从q m中找出前3大峰值对应的位置记为p n,n=0,1,2。
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