CN105227392A

CN105227392A - A kind of method of reception timing detection and device

Info

Publication number: CN105227392A
Application number: CN201410318871.8A
Authority: CN
Inventors: 周海军; 刘刚
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: CICTCI Technology Co Ltd
Priority date: 2014-07-04
Filing date: 2014-07-04
Publication date: 2016-01-06
Anticipated expiration: 2034-07-04
Also published as: CN105227392B

Abstract

The present invention provides a receiving timing detection method and device. In one method, the short preambles of all sub-band signals are the same as the local short preambles, and each sub-band signal uses all the frequency domain resources except the preamble. Using different frequency domain resources, the long preambles of different subband signals are based on different set time offsets of the same local base sequence, another method uses mutually orthogonal short preambles and long preambles; when timing detection , perform rough estimation according to the short preamble, intercept a long preamble and perform time domain correlation with the local base sequence to determine the receiving time of the long preamble of each subband signal in the received signal; according to the long preamble of each subband signal in the received signal The receiving moment of the received signal determines the receiving moment of the data symbol of each sub-band signal in the received signal. The invention solves the problem of how to quickly determine the receiving timing of each subband signal when the distributed system adopts frequency division.

Description

A receiving timing detection method and device

技术领域technical field

本发明涉及无线通信技术领域，尤其涉及一种接收定时检测方法及装置。The invention relates to the technical field of wireless communication, in particular to a receiving timing detection method and device.

背景技术Background technique

通常分布式系统的信道结构如图1所示。其中前导码用于AGC、同步和频偏估计，物理层控制信道包含解出随后所传数据的必要信息。物理层控制信道之后传输高层信令与数据。Usually, the channel structure of a distributed system is shown in Fig. 1 . Among them, the preamble is used for AGC, synchronization and frequency offset estimation, and the physical layer control channel contains the necessary information to decode the data transmitted subsequently. After the physical layer control channel, high-level signaling and data are transmitted.

如图2所示，非频分系统的前导码通常由短前导码和长前导码构成，如图3所示为IEEE802.11p帧结构，IEEE802.11p定义了多个重复的短前导码序列，即t1～t10、GI2是长前导码的循环前缀、T1和T2是长前导码、GI是数据符号的循环前缀。As shown in Figure 2, the preamble of a non-frequency division system usually consists of a short preamble and a long preamble. Figure 3 shows the IEEE802.11p frame structure. IEEE802.11p defines multiple repeated short preamble sequences. That is, t1-t10, GI2 are the cyclic prefix of the long preamble, T1 and T2 are the long preamble, and GI is the cyclic prefix of the data symbol.

利用短前导码采用自相关法可大致确定长前导码的接收时间，获得粗时间同步，之后截取一段长前导码进行时域相关可估计出接收信号的准确时间。为了克服相关值中的“平台”现象并提高估计精度，通常需要计算两个自相关值序列。具体过程如下：Using the autocorrelation method of the short preamble, the receiving time of the long preamble can be roughly determined, and coarse time synchronization can be obtained. Afterwards, a section of the long preamble can be intercepted for time domain correlation to estimate the accurate time of receiving the signal. To overcome the "plateau" phenomenon in the correlation values and improve the estimation accuracy, it is usually necessary to compute two sequences of autocorrelation values. The specific process is as follows:

对于接收信号，从起始位置截取短前导码与其自身时延1个短前导序列符号Ns进行自相关运算，得到第一个相关值序列M₁(θ)，1个短前导序列符号为16个时域采样点，Ns为16。For the received signal, the short preamble is intercepted from the starting position and its own time delay is 1 short preamble symbol Ns for autocorrelation operation, and the first correlation value sequence M ₁ (θ) is obtained, and a short preamble symbol is 16 Time domain sampling points, Ns is 16.

${M m}_{11} ((θ θ)) = = \frac{{Σ Σ}_{m m = = 00}^{Ns NS - - 11} r r ((θ θ + + m m)) \times \times r r * * ((θ θ + + m m + + Ns NS))}{{Σ Σ}_{m m = = 00}^{Ns NS - - 11} {| | r r ((θ θ + + m m)) | |}^{22}}$

其中，θ为时域采样点，r为从接收信号中截取的短前导码序列。Among them, θ is the sampling point in the time domain, and r is the short preamble sequence intercepted from the received signal.

从起始位置截取短前导码与其自身时延2个短前导序列符号Ns进行自相关运算，得到第二个相关值序列M₂(θ)。The short preamble is intercepted from the starting position and its own time delay is 2 short preamble symbols Ns for autocorrelation operation, and the second correlation value sequence M ₂ (θ) is obtained.

${M m}_{22} ((θ θ)) = = \frac{{Σ Σ}_{m m = = 00}^{Ns NS - - 11} r r ((θ θ + + m m)) \times \times r r * * ((θ θ + + m m + + 22 Ns NS))}{{Σ Σ}_{m m = = 00}^{Ns NS - - 11} {| | r r ((θ θ + + m m)) | |}^{22}}$

计算M₁(θ)-M₂(θ)，根据得到的序列的峰值位置确定短前导码的接收时刻：Calculate M ₁ (θ)-M ₂ (θ), and determine the receiving moment of the short preamble according to the peak position of the obtained sequence:

$\overset{^^}{θ θ} = = arg arg \underset{θ θ}{max max} (({M m}_{11} ((θ θ)) - - {M m}_{22} ((θ θ))))$

如图4所示为两个相关值序列相减后得到的结果，确定峰值出现的位置对应的时刻，确定该时刻向前推移1个短前导序列符号Ns为短前导码的开始时刻T。从T+△开始截取一个长前导码，与本地长前导码(基序列)做时域相关，相关峰会出现在时间t_i，确定t_i为长前导码的开始时刻，根据长前导码的开始时刻确定接收符号的时刻。As shown in Figure 4, the result obtained after the subtraction of the two correlation value sequences is determined, and the time corresponding to the position of the peak is determined, and it is determined that this time moves forward by 1 short preamble sequence symbol Ns as the start time T of the short preamble. _Intercept a long preamble from T+ _△ , and do time-domain correlation with the local long preamble (base sequence). The instant at which a symbol is received is determined.

如图5所示，采用频分机制后，多个用户所传数据在频域上是分离的，各占用一个频带，但在时域上发生了重叠。在接收端，如何分别确定每个频带所收数据的定时成为一个必须解决的问题，但目前还没有相应的定时同步检测方案。As shown in Figure 5, after adopting the frequency division mechanism, the data transmitted by multiple users is separated in the frequency domain, each occupying a frequency band, but overlapped in the time domain. At the receiving end, how to separately determine the timing of data received in each frequency band has become a problem that must be solved, but there is no corresponding timing synchronization detection scheme at present.

发明内容Contents of the invention

本发明提供一种接收定时检测方法及装置，解决了当分布式系统采用频分时如何快速的确定各个子带信号的接收定时的问题。The invention provides a receiving timing detection method and device, which solves the problem of how to quickly determine the receiving timing of each sub-band signal when the distributed system adopts frequency division.

本发明提供一种接收定时检测方法，包括：The present invention provides a receiving timing detection method, including:

从接收信号中截取一段信号与本地短前导码进行第一时域相关，所述接收信号包括多个子带信号，所有的子带信号的短前导码与本地短前导码相同，且各子带信号除前导码使用全部的频域资源外其余部分使用不同的频域资源，不同子带信号的长前导码是基于同一本地基序列的不同设定时间偏移；Intercept a section of signal from the received signal and perform first time-domain correlation with the local short preamble, the received signal includes multiple sub-band signals, the short preambles of all sub-band signals are the same as the local short preamble, and each sub-band signal Except that the preamble uses all frequency domain resources, the rest uses different frequency domain resources, and the long preambles of different subband signals are based on different set time offsets of the same local base sequence;

根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；Determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the length of the multiple subband signals in the corresponding received signal according to the receiving time of the short preamble of each subband signal in the received signal The starting time point T0 of the preamble;

根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关；According to T0 and the length of the local base sequence, intercept a section of signal from the received signal and perform the second time domain correlation with the local base sequence;

根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻；Determining the receiving moment of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

根据接收信号中各个子带信号的长前导码的接收时刻，确定接收信号中各个子带信号的数据符号的接收时刻。According to the receiving time of the long preamble of each sub-band signal in the received signal, the receiving time of the data symbol of each sub-band signal in the received signal is determined.

优选地，根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，具体包括：Preferably, the receiving time of the short preamble of each subband signal in the received signal is determined according to the first time domain correlation result, specifically including:

将第一时域相关得到的序列中不大于设定门限M的离散点取值置零；Set the value of the discrete point not greater than the set threshold M in the sequence obtained by the first time domain correlation to zero;

对于每个非零的离散点，确定该离散点对应的时间点t_j为接收信号中子带信号的短前导码的接收时刻。For each non-zero discrete point, determine the time point _tj corresponding to the discrete point as the receiving moment of the short preamble of the subband signal in the received signal.

优选地，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0，具体包括：Preferably, according to the receiving moment of the short preamble of each subband signal in the received signal, determine the start time point T0 of the long preamble corresponding to the multiple subband signals in the received signal, specifically including:

在接收信号中各子带信号的短前导码的接收时刻均为t时，确定T0为t；When the receiving time of the short preamble of each subband signal in the received signal is t, it is determined that T0 is t;

在接收信号中各子带信号的短前导码的接收时刻为多个时，确定T0为接收信号中各子带信号的短前导码的接收时刻中最靠前的时刻；或者When there are multiple receiving moments of the short preamble of each subband signal in the received signal, determine that T0 is the most preceding moment among the receiving moments of the short preamble of each subband signal in the received signal; or

在接收信号中各子带信号的短前导码的接收时刻为多个时，确定T0为接收信号中各子带信号的短前导码的接收时刻中最靠前的时刻和最靠后的时刻之间的任一时刻。When there are multiple receiving moments of the short preamble of each sub-band signal in the received signal, determine T0 as one of the frontmost moment and the last moment of the receiving moment of the short preamble of each sub-band signal in the received signal any moment in between.

优选地，根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关，具体包括：Preferably, according to T0 and the length of the local base sequence, a section of signal is intercepted from the received signal and the local base sequence is correlated with the second time domain, specifically including:

从T0+△开始截取一段不小于本地基序列长度的接收信号与本地基序列进行第二时域相关，△为长前导码的前缀时间长度。From T0+△, a section of received signal not less than the length of the local base sequence is intercepted to perform second time-domain correlation with the local base sequence, and △ is the prefix time length of the long preamble.

优选地，根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻，具体包括：Preferably, the receiving time of the long preamble of each subband signal in the received signal is determined according to the second time domain correlation result, specifically including:

将第二时域相关得到的序列中不大于设定门限P的离散点取值置零；Set the value of the discrete point not greater than the set threshold P in the sequence obtained by the second time domain correlation to zero;

对于每个非零的离散点，确定该离散点对应的时间点t_n，若时间窗[t_n-△1，t_n+△1]内该离散点的取值最大，则确定t_n为接收信号中子带信号的长前导码基于本地基序列偏移其中一个设定时间后的时刻；For each non-zero discrete point, determine the time point t _n corresponding to the discrete point, if the value of the discrete point within the time window [t _n -△1, t _n +△1] is the largest, then determine t _n as The time after the long preamble of the sub-band signal in the received signal is offset by one of the set times based on the local base sequence;

根据t_n确定对应的设定时间，将t_n反向偏移对应的设定时间，得到接收信号中一个子带信号的长前导码的接收时刻相对于T0的时间偏移量为t_△n；Determine the corresponding setting time according to t _n , and shift t _n inversely to the corresponding setting time, and obtain the time offset of the receiving time of the long preamble of a subband signal in the received signal relative to T0 as t _Δn ;

根据T0及时间偏移量为t_△n得到接收信号中子带信号长前导码的接收时刻T0+t_△n。According to T0 and the time offset t _Δn , the receiving time T0+t _Δn of the long preamble of the sub-band signal in the received signal is obtained.

优选地，根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻，具体包括：Preferably, according to the receiving moment of the long preamble of each subband signal in the received signal, determine the receiving moment of the data symbol of each subband signal in the received signal, specifically including:

确定接收信号中数据符号j的接收起始点等于T0+t_△n+T_cj+△2，其中T_cj是数据符号j到短前导码和长前导码分界点的时间距离，△2是定时调整量。Determine that the receiving start point of data symbol j in the received signal is equal to T0+t _△n + T _cj + △2, where T _cj is the time distance from data symbol j to the boundary point of the short preamble and the long preamble, and △2 is the timing adjustment quantity.

本发明还提供一种接收定时检测方法，包括：The present invention also provides a receiving timing detection method, including:

根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；According to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the short preamble, the short preamble of each subband signal that is orthogonal to each other in the time domain is generated by using OFDM based on the set sequence. A preamble, wherein each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M/M of the OFDM data symbol, and M is a positive integer;

根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；According to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the long preamble, the long preamble of each subband signal orthogonal to each other in the time domain is generated by using OFDM based on the set sequence, and the long preamble The length of is N/N of the OFDM data symbol, and N is a positive integer;

从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；Intercepting a segment of the signal from the received signal and performing a first time domain correlation with the short preamble of each sub-band signal in the frequency division system, the received signal includes a plurality of sub-band signals;

根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；According to the length of T0 and the long preamble, intercepting a section of signal from the received signal and performing second time domain correlation with the long preamble of each subband signal in the frequency division system;

根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；Determine the receiving moment of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻。According to the receiving time of the long preamble of each sub-band signal in the received signal, the receiving time of the data symbol of each sub-band signal in the received signal is determined.

优选地，所述设定序列为zadoff-chu序列。Preferably, the set sequence is a zadoff-chu sequence.

优选地，采用如下公式生成各子带信号的短前导码：Preferably, the following formula is used to generate the short preamble of each subband signal:

$Si Si ((k k)) = = \frac{11}{L L 11} {Σ Σ}_{m m = = a a}^{b b} {e e}^{- - \frac{jπ jπ}{| | b b - - a a + + 11 | | | |} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{L L 11} * * m m * * k k}$

采用如下公式生成各子带信号的长前导码：Use the following formula to generate the long preamble of each subband signal:

$Li Li ((k k)) = = \frac{11}{L L 22} {Σ Σ}_{m m = = a a}^{b b} {e e}^{- - \frac{jπ jπ}{| | b b - - a a + + 11 | |} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{L L 22} * * m m * * k k}$

其中，Si(k)表示子带信号i的短前导码，Li(k)表示子带信号i的长前导码，i为子带信号的编号，L1为短前导码的长度，L2为长前导码的长度，a为子带信号i占用的频带编号的最小值，b为子带信号i占用的频带编号的最大值，q为设定参数，m为设定参数，k为设定变量。Among them, Si(k) represents the short preamble of the subband signal i, Li(k) represents the long preamble of the subband signal i, i is the number of the subband signal, L1 is the length of the short preamble, and L2 is the long preamble The length of the code, a is the minimum value of the frequency band number occupied by the sub-band signal i, b is the maximum value of the frequency band number occupied by the sub-band signal i, q is a setting parameter, m is a setting parameter, and k is a setting variable.

优选地，根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进第二行时域相关，具体包括：Preferably, according to T0 and the length of the long preamble, a section of signal is intercepted from the received signal and the long preamble of each subband signal in the frequency division system is correlated in the second line of time domain, specifically including:

从T0+△开始截取一段不小于长前导码长度的接收信号与频分系统中各子带信号的长前导码进行第二时域相关，△为长前导码的前缀时间长度。Starting from T0+△, a section of received signal not less than the length of the long preamble is intercepted and correlated with the long preamble of each subband signal in the frequency division system in the second time domain, and △ is the prefix time length of the long preamble.

优选地，根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻，具体包括：Preferably, the receiving time of the long preamble of each subband signal in the received signal is determined according to the second time domain correlation result, specifically including:

对于每个非零的离散点，确定该离散点对应的时间点t_n为接收信号中子带信号的长前导码的接收时刻相对于T0的时间偏移量为t_△n；For each non-zero discrete point, determine that the time point t _n corresponding to the discrete point is the time offset of the long preamble of the subband signal in the received signal relative to T0, and the time offset is t _Δn ;

根据T0及时间偏移量为t_△n，得到接收信号中该子带信号长前导码的接收时刻T0+t_△n。According to T0 and the time offset t _Δn , the receiving time T0+t _Δn of the long preamble of the sub-band signal in the received signal is obtained.

确定数据符号j的接收起始点等于T0+t_△n+T_cj+△2，其中T_cj是数据符号j到短前导码和长前导码分界点的时间距离，△2是定时调整量。Determine the receiving starting point of data symbol j equal to T0+t _Δn +T _cj + Δ2, where T _cj is the time distance from data symbol j to the boundary point of short preamble and long preamble, and Δ2 is the timing adjustment amount.

本发明还提供一种接收定时检测装置，包括：The present invention also provides a receiving timing detection device, including:

第一时域相关单元，用于从接收信号中截取一段信号与本地短前导码进行第一时域相关，所述接收信号包括多个子带信号，所有的子带信号的短前导码与本地短前导码相同，且各子带信号除前导码使用全部的频域资源外其余部分使用不同的频域资源，不同子带信号的长前导码是基于同一本地基序列的不同设定时间偏移；The first time domain correlation unit is used to intercept a section of signal from the received signal and perform the first time domain correlation with the local short preamble. The received signal includes a plurality of sub-band signals, and the short preambles of all sub-band signals are correlated with the local short preamble. The preambles are the same, and the subband signals use different frequency domain resources except the preamble uses all the frequency domain resources, and the long preambles of different subband signals are based on different set time offsets of the same local base sequence;

第一确定单元，用于根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；The first determination unit is configured to determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the corresponding received signal according to the receiving time of the short preamble of each subband signal in the received signal The starting time point T0 of the long preamble of the multiple subband signals in the middle;

第二时域相关单元，用于根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关；The second time domain correlation unit is used to intercept a section of signal from the received signal and perform second time domain correlation with the local base sequence according to T0 and the length of the local base sequence;

第二确定单元，用于根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻；The second determining unit is used to determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

第三确定单元，用于根据接收信号中各个子带信号的长前导码的接收时刻，确定接收信号中各个子带信号的数据符号的接收时刻。The third determining unit is configured to determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal.

优选地，第一确定单元根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，具体包括：Preferably, the first determining unit determines the receiving moment of the short preamble of each subband signal in the received signal according to the first time domain correlation result, specifically including:

优选地，第一确定单元根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0，具体包括：Preferably, the first determination unit determines the start time point T0 of the long preamble corresponding to the multiple subband signals in the received signal according to the receiving time of the short preamble of each subband signal in the received signal, specifically including:

优选地，第二时域相关单元根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关，具体包括：Preferably, the second time domain correlation unit intercepts a section of signal from the received signal according to T0 and the length of the local base sequence to perform the second time domain correlation with the local base sequence, specifically including:

优选地，第二确定单元根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻，具体包括：Preferably, the second determining unit determines the receiving moment of the long preamble of each subband signal in the received signal according to the second time domain correlation result, specifically including:

优选地，第三确定单元根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻，具体包括：Preferably, the third determining unit determines the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal, specifically including:

本发明还提供一种接收定时检测装置，包括处理器和数据收发机，其中：The present invention also provides a receiving timing detection device, including a processor and a data transceiver, wherein:

所述处理器被配置为用于：从接收信号中截取一段信号与本地短前导码进行第一时域相关，所述接收信号包括多个子带信号，所有的子带信号的短前导码与本地短前导码相同，且各子带信号除前导码使用全部的频域资源外其余部分使用不同的频域资源，不同子带信号的长前导码是基于同一本地基序列的不同设定时间偏移；根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关；根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻；根据接收信号中各个子带信号的长前导码的接收时刻，确定接收信号中各个子带信号的数据符号的接收时刻；The processor is configured to: intercept a section of signal from the received signal and perform first time-domain correlation with the local short preamble, the received signal includes a plurality of sub-band signals, and the short preambles of all sub-band signals are correlated with the local short preamble The short preambles are the same, and the subband signals use different frequency domain resources except the preamble uses all the frequency domain resources. The long preambles of different subband signals are based on different set time offsets of the same local base sequence Determining the receiving moment of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determining the time of multiple subband signals in the corresponding received signal according to the receiving moment of the short preamble of each subband signal in the received signal The starting time point T0 of the long preamble; according to T0 and the length of the local base sequence, intercept a section of the signal from the received signal and perform the second time domain correlation with the local base sequence; determine each subgroup in the received signal according to the second time domain correlation result The receiving moment of the long preamble of the band signal; according to the receiving moment of the long preamble of each subband signal in the received signal, determine the receiving moment of the data symbol of each subband signal in the received signal;

数据收发机在处理器的控制下收发数据。The data transceiver transmits and receives data under the control of the processor.

短前导码确定单元，用于根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；The short preamble determination unit is used to generate mutually regular sub-bands in the time domain based on the set sequence and the method of orthogonal frequency division multiplexing OFDM based on the frequency domain resources occupied by each subband signal in the frequency division system and the length of the short preamble. The short preamble of each sub-band signal handed over, wherein, each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M of the OFDM data symbol, and M is a positive integer;

长前导码确定单元，用于根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；The long preamble determination unit is used to generate each subband signal orthogonal to each other in the time domain by using OFDM based on the set sequence according to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the long preamble The length of the long preamble, the length of the long preamble is one N/N of the OFDM data symbol, and N is a positive integer;

第一时域相关单元，用于从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；The first time domain correlation unit is used to intercept a section of signal from the received signal and perform the first time domain correlation with the short preamble of each subband signal in the frequency division system, and the received signal includes a plurality of subband signals;

第二时域相关单元，用于根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；The second time domain correlation unit is used to intercept a section of signal from the received signal and perform second time domain correlation with the long preambles of each subband signal in the frequency division system according to the length of T0 and the long preamble;

第二确定单元，用于根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；The second determining unit is configured to determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

第三确定单元，用于根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻。The third determining unit is configured to determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal.

优选地，短前导码确定单元采用如下公式生成各子带信号的短前导码：Preferably, the short preamble determining unit adopts the following formula to generate the short preamble of each subband signal:

短前导码确定单元采用如下公式生成各子带信号的长前导码：The short preamble determining unit adopts the following formula to generate the long preamble of each subband signal:

优选地，第一确定单元根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0，具体包括：Preferably, the first determination unit determines the start time point T0 of the long preamble corresponding to multiple subband signals in the received signal according to the receiving time of the short preamble of each subband signal in the received signal, specifically including:

在接收信号中各子带信号的短前导码的接收时刻为多个时，确定T0为接收信号中各子带信号的短前导码的接收时刻中最靠前的时刻和最靠后的时刻之间的任一时刻。When there are multiple receiving moments of the short preamble of each subband signal in the received signal, determine T0 as one of the frontmost moment and the last moment of the receiving moment of the short preamble of each subband signal in the received signal any moment in between.

优选地，第二时域相关单元根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关，具体包括：Preferably, the second time domain correlation unit intercepts a section of signal from the received signal according to the length of T0 and the long preamble and performs the second time domain correlation with the long preamble of each subband signal in the frequency division system, specifically including:

优选地，第二确定单元根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻，具体包括：Preferably, the second determining unit determines the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result, specifically including:

优选地，第三确定单元，用于根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻，具体包括：Preferably, the third determining unit is configured to determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal, specifically including:

所述处理器被配置为用于：根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻；The processor is configured to: according to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the short preamble, based on the set sequence, it is generated in the time domain by means of Orthogonal Frequency Division Multiplexing (OFDM). The short preambles of each sub-band signal that are orthogonal to each other, wherein each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M of the OFDM data symbol, and M is a positive integer; according to the frequency division system The frequency domain resources occupied by each sub-band signal and the length of the long preamble, based on the set sequence, the long preamble of each sub-band signal that is orthogonal to each other in the time domain is generated by using OFDM, and the length of the long preamble is OFDM One-Nth of the data symbol, N is a positive integer; intercepting a section of signal from the received signal and performing first time-domain correlation with the short preamble of each sub-band signal in the frequency division system, the received signal includes a plurality of sub-band signals; Determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the length of the multiple subband signals in the corresponding received signal according to the receiving time of the short preamble of each subband signal in the received signal The starting time point T0 of the preamble; according to the length of T0 and the long preamble, a section of signal is intercepted from the received signal and the long preamble of each subband signal in the frequency division system is correlated with the second time domain; according to the second time domain The correlation result determines the receiving moment of the long preamble of each subband signal in the received signal; according to the receiving moment of the long preamble of each subband signal in the received signal, determines the receiving moment of the data symbol of each subband signal in the received signal;

本发明实施例提供的接收定时检测方法及装置，解决了当分布式系统采用频分时如何快速的确定各个子带信号的接收定时的问题，可以快速准确地确定出各个子带信号中数据符号的接收时刻。The receiving timing detection method and device provided by the embodiments of the present invention solve the problem of how to quickly determine the receiving timing of each sub-band signal when the distributed system adopts frequency division, and can quickly and accurately determine the data symbols in each sub-band signal receiving time.

附图说明Description of drawings

图1为通常分布式系统的信道结构示意图；FIG. 1 is a schematic diagram of a channel structure of a common distributed system;

图2为通常分布式系统的前导码结构示意图；FIG. 2 is a schematic diagram of a preamble structure of a common distributed system;

图3为IEEE802.11p中所定义的多个重复的短前导序列及长前导码序列示意图；FIG. 3 is a schematic diagram of multiple repeated short preamble sequences and long preamble sequences defined in IEEE802.11p;

图4为两个相关值序列相减过程示意图；Fig. 4 is a schematic diagram of the subtraction process of two correlation value sequences;

图5为频分系统的信道结构示意图；5 is a schematic diagram of a channel structure of a frequency division system;

图6为本发明实施例提供的一种接收定时检测方法流程图；FIG. 6 is a flowchart of a receiving timing detection method provided by an embodiment of the present invention;

图7为包含相邻频带的频分系统示意图；FIG. 7 is a schematic diagram of a frequency division system including adjacent frequency bands;

图8为将基序列进行不同时间偏移得到不同子带信号长前导码示意图；Fig. 8 is a schematic diagram of long preambles of different subband signals obtained by performing different time offsets on the base sequence;

图9为将接收信号与基序列进行第二时域相关后的结果示意图；Fig. 9 is a schematic diagram of the result after performing the second time domain correlation between the received signal and the base sequence;

图10为本发明实施例提供的另一种接收定时检测方法流程图；FIG. 10 is a flow chart of another receiving timing detection method provided by an embodiment of the present invention;

图11为本发明实施例频分系统中包括两个子带信号占用的频域资源示意图；FIG. 11 is a schematic diagram of frequency domain resources occupied by two subband signals in a frequency division system according to an embodiment of the present invention;

图12为本发明实施例提供的一种接收定时检测装置结构图；FIG. 12 is a structural diagram of a reception timing detection device provided by an embodiment of the present invention;

图13为本发明实施例提供的另一种接收定时检测装置结构图。FIG. 13 is a structural diagram of another reception timing detection device provided by an embodiment of the present invention.

具体实施方式detailed description

下面结合附图和实施例对本发明提供的接收定时检测方法及装置进行更详细地说明。The reception timing detection method and device provided by the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

为了解决分布式系统采用频分时如何快速的确定各个子带信号的接收定时的问题，需要确定频分系统中各子带信号使用什么样的短前导码和长前导码，基于所使用的短前导码和长前导码如何进行定时检测。In order to solve the problem of how to quickly determine the receiving timing of each sub-band signal when the distributed system adopts frequency division, it is necessary to determine what kind of short preamble and long preamble are used for each sub-band signal in the frequency division system. How preamble and long preamble are timing detected.

依照本发明实施例，提供一种接收定时检测方法，如图6所示，包括：According to an embodiment of the present invention, a receiving timing detection method is provided, as shown in FIG. 6, including:

步骤601，从接收信号中截取一段信号与本地短前导码进行第一时域相关，所述接收信号包括多个子带信号，所有的子带信号的短前导码与本地短前导码相同，且各子带信号除前导码使用全部的频域资源外其余部分使用不同的频域资源，不同子带信号的长前导码是基于同一本地基序列的不同设定时间偏移；Step 601, intercepting a section of signal from the received signal and performing first time-domain correlation with the local short preamble, the received signal includes multiple sub-band signals, the short preambles of all sub-band signals are the same as the local short preamble, and each The subband signals use different frequency domain resources except for the preamble which uses all the frequency domain resources. The long preambles of different subband signals are based on different set time offsets of the same local base sequence;

本实施例所提供的方法，频分系统中各子带信号使用相同的短前导码，且使用的频域资源相同即使用全部的频域资源，因此可以采用本地短前导码与接收信号进行第一时域相关，根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻。In the method provided in this embodiment, each sub-band signal in the frequency division system uses the same short preamble, and uses the same frequency domain resources, that is, uses all frequency domain resources, so the local short preamble and the received signal can be used for the first A time domain correlation, determining the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result.

可以根据本地短前导码的长度，从接收信号的起始位置截取不小于本地短前导码长度的一段信号与本地短前导码进行第一时域相关。According to the length of the local short preamble, a segment of signal not less than the length of the local short preamble may be intercepted from the starting position of the received signal to perform first time-domain correlation with the local short preamble.

步骤602，根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；Step 602: Determine the receiving time of the short preamble of each sub-band signal in the received signal according to the first time domain correlation result, and determine multiple sub-bands in the corresponding received signal according to the receiving time of the short preamble of each sub-band signal in the received signal The starting time point T0 of the long preamble of the signal;

对应接收信号中多个子带信号的长前导码的起始时间点T0为一个估计值，如果接收信号中各子带信号的短前导码同步，则第一时域相关结果中会出现一个峰值，如不同步，会出现多个峰值，根据峰值出现的时刻可以估计一个大概的长前导码的起始时间点T0，具体的估计方法可以灵活确定，这里不做详细限定。The start time point T0 of the long preamble corresponding to multiple subband signals in the received signal is an estimated value. If the short preambles of each subband signal in the received signal are synchronized, a peak will appear in the first time domain correlation result, If not synchronized, there will be multiple peaks, and a rough start time point T0 of the long preamble can be estimated according to the time when the peaks appear. The specific estimation method can be flexibly determined, and will not be limited here.

步骤603，根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关；Step 603, according to T0 and the length of the local base sequence, intercept a section of signal from the received signal and perform second time-domain correlation with the local base sequence;

所截取的信号长度不小于本地基序列的长度。The length of the intercepted signal is not less than the length of the local base sequence.

步骤604，根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻；Step 604, determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

本实施例所提供的方法，频分系统中各子带信号使用相同的不同子带信号的长前导码是同一基序列的不同时间偏移，这里的时间偏移可以包括零，即其中一个子带信号直接使用基序列作为长前导码。In the method provided in this embodiment, each sub-band signal in the frequency division system uses the same long preamble of different sub-band signals as different time offsets of the same base sequence, where the time offset may include zero, that is, one of the sub-bands The band signal directly uses the base sequence as the long preamble.

由于不同的子带信号使用不同的长前导码，因此在接收信号包括多个子带信号时，如果各子带信号同步，则第二时域相关的序列中会在相应的时间偏移位置出现多个峰值，如果不同步，则峰值在相应的时间偏移位置有一定的偏移，从而可以确定接收信号中各子带信号的长前导码的接收时刻。Since different sub-band signals use different long preambles, when the received signal includes multiple sub-band signals, if the sub-band signals are synchronized, multiple If they are not synchronized, the peak has a certain offset at the corresponding time offset position, so that the receiving time of the long preamble of each subband signal in the received signal can be determined.

步骤605，根据接收信号中各个子带信号的长前导码的接收时刻，确定接收信号中各个子带信号的数据符号的接收时刻。Step 605: Determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal.

本发明实施例中第一时域相关和第二时域相关均为相关运算。In the embodiment of the present invention, both the first time domain correlation and the second time domain correlation are correlation operations.

优选地，本实施例根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，具体包括：Preferably, this embodiment determines the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, specifically including:

非零的离散点可能为一个也可能为多个。There may be one or more non-zero discrete points.

如果非零的离散点只有一个，说明多个子带信号同步，即接收信号中各子带信号的短前导码的接收时刻均为t，确定对应接收信号中多个子带信号的长前导码的起始时间点T0为t。If there is only one non-zero discrete point, it means that multiple sub-band signals are synchronized, that is, the receiving time of the short preamble of each sub-band signal in the received signal is t, and the starting point of the long preamble of multiple sub-band signals in the corresponding received signal is determined The starting time point T0 is t.

如果非零的离散点为多个，说明多个子带信号不同步，即接收信号中各子带信号的短前导码的接收时刻为多个，确定T0为接收信号中各子带信号的短前导码的接收时刻中最靠前的时刻；或者确定T0为接收信号中各子带信号的短前导码的接收时刻中最靠前的时刻和最靠后的时刻之间的任一时刻。If there are multiple non-zero discrete points, it means that multiple sub-band signals are not synchronized, that is, the receiving time of the short preamble of each sub-band signal in the received signal is multiple, and T0 is determined to be the short preamble of each sub-band signal in the received signal The frontmost moment in the receiving moment of the code; or determine T0 as any moment between the earliest moment and the latest moment in the receiving moment of the short preamble of each subband signal in the received signal.

本发明提供的接收定时检测方法，适于应用于频分系统，如图7所示，频分系统中各频带可以是相邻的，每个子带信号占用一个频带上的频域资源。以N＝3，即频分系统中有3个子带信号为例，如图8所示，在基序列的基础上，分别向后偏移t1、偏移t2、偏移t3得到对应的长前导码，t1为零。The receiving timing detection method provided by the present invention is suitable for application in frequency division systems. As shown in FIG. 7 , frequency bands in the frequency division system may be adjacent, and each sub-band signal occupies frequency domain resources on one frequency band. Taking N=3, that is, there are 3 sub-band signals in the frequency division system as an example, as shown in Figure 8, on the basis of the base sequence, the corresponding long preambles are respectively obtained by offsetting backwards by t1, offsetting t2, and offsetting t3 code, t1 is zero.

优选地，从T0+△开始截取一段不小于本地基序列长度的接收信号与本地基序列进行第二时域相关，△为长前导码的前缀时间长度。Preferably, a section of received signals not less than the length of the local base sequence is intercepted from T0+Δ for second time-domain correlation with the local base sequence, where Δ is the prefix time length of the long preamble.

当长前导码为子带信号i所对应的长前导码时，与基序列做第二时域相关，相关峰会出现在时间t_i，其中t_i为子带信号i的长前导码基于本地基序列延迟其中一个设定时间后的时刻。When the long preamble is the long preamble corresponding to the subband signal i, the second time domain correlation with the base sequence is performed, and the correlation peak appears at time t _i , where t _i is the long preamble of the subband signal i based on the local base sequence The moment after which the sequence is delayed by one of the set times.

根据本地基序列的时间位置及分别偏移设定时间后的时间位置，以及t_i的位置，可以确定延迟t_i的设定时间。The set time of the delay t _i can be determined according to the time position of the local base sequence, the time position offset by the set time, and the position of t _i .

如图9所示，前两个峰值(实线部分)分别与本地基序列偏移t0和偏移t1的位置重合，第三个峰值(实线部分)相对于本地基序列偏移t2为一定偏差，因此第一个峰值对应t0，第二个峰值对应t1，第三个峰值对应t2，将第二峰值对应的时刻向前推移t1，将第三个峰值对应的时刻向前推移t2，可以得到三个子带信号中长前导码相对于T0的时间偏移量，其中两个子带信号中长前导码的相对于T0的时间偏移量为0，其中另一个子带信号中长前导码相对于T0的时间偏移量为非0。As shown in Figure 9, the first two peaks (the solid line part) coincide with the positions of the local base sequence offset t0 and offset t1 respectively, and the third peak (the solid line part) has a certain offset relative to the local base sequence t2 Deviation, so the first peak corresponds to t0, the second peak corresponds to t1, the third peak corresponds to t2, the time corresponding to the second peak is moved forward by t1, and the time corresponding to the third peak is moved forward by t2, you can The time offset of the long preamble relative to T0 in the three sub-band signals is obtained, and the time offset of the long preamble in the two sub-band signals relative to T0 is 0, and the long preamble in the other sub-band signal is relative to The time offset from T0 is non-zero.

将第二时域相关得到的序列中模值不大于设定门限P的离散点取值置零，设得到的序列为R＝R1、R2、……、RN，R1对应的时间点是0，RN对应的时间点是Ts*N，Ts是信号的采样点间隔，N为序列中离散点的个数；In the sequence obtained by the second time domain correlation, the value of the discrete point whose modulus value is not greater than the set threshold P is set to zero, and the obtained sequence is set as R=R1, R2, ..., RN, and the corresponding time point of R1 is 0, The time point corresponding to RN is Ts*N, Ts is the sampling point interval of the signal, and N is the number of discrete points in the sequence;

对于每个非零的离散点，确定该离散点对应的时间点t_n，若时间窗[t_n-△1，t_n+△1]内该离散点的模值最大，则确定t_n为接收信号中子带信号的长前导码基于本地基序列延迟其中一个设定时间后的时刻，其中△1为设定的偏移量；For each non-zero discrete point, determine the time point t _n corresponding to the discrete point, if the modulus value of the discrete point within the time window [t _n -△1, t _n +△1] is the largest, then determine t _n as The long preamble of the subband signal in the received signal is delayed for a set time based on the local base sequence, where △1 is the set offset;

根据t_n确定对应的设定时间，将t_n向前推移对应的设定时间，得到接收信号中一个子带信号的长前导码的接收时刻相对于T0的时间偏移量为t_△n；Determine the corresponding set time according to t _n , move t _n forward to the corresponding set time, and obtain the time offset of the receiving moment of the long preamble of a subband signal in the received signal relative to T0 as t _Δn ;

确定接收信号中数据符号j的接收起始点等于T0+t_△n+T_cj+△2，其中T_cj是数据符号j到短前导码和长前导码分界点的时间距离，△2是定时调整量，可取符号后缀时间长度的1/3。Determine that the receiving start point of data symbol j in the received signal is equal to T0+t _△n + T _cj + △2, where T _cj is the time distance from data symbol j to the boundary point of the short preamble and the long preamble, and △2 is the timing adjustment The amount can be 1/3 of the time length of the symbol suffix.

本发明实施例根据接收信号与本地基序列的时域相关峰的位置可以判断出能够接收到几个子带的信号，以及各个子带信号的时间偏移量，从而确定出时域号的接收窗。According to the position of the time-domain correlation peak of the received signal and the local base sequence, the embodiment of the present invention can determine how many sub-band signals can be received, and the time offset of each sub-band signal, so as to determine the receiving window of the time-domain number .

在图9的示例中，采用接收的长前导码与本地基序列进行第二时域相关，可得相关序列R。虚线是T0+t1、T0+t2、T0+t3所在位置，三条实线是实际检测出的模值大于P的相关值，因此可以判断出子带0、1、2上均有有效信号传输，模值R0对应的t△0＝0，模值R1对应的t△n＝0，数据符号j的截取起始点等于T0+Tcj+△2。In the example in FIG. 9 , the correlation sequence R can be obtained by using the received long preamble to perform second time-domain correlation with the local base sequence. The dotted lines are the positions of T0+t1, T0+t2, and T0+t3, and the three solid lines are the actual detected modulus values greater than the relevant value of P, so it can be judged that there are effective signal transmissions on subbands 0, 1, and 2. tΔ0=0 corresponding to the modulus R0, tΔn=0 corresponding to the modulus R1, and the starting point of interception of the data symbol j is equal to T0+Tcj+Δ2.

依照本发明实施例，提供另一种接收定时检测方法，如图10所示，包括：According to an embodiment of the present invention, another receiving timing detection method is provided, as shown in FIG. 10 , including:

步骤1001，根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；Step 1001, according to the frequency domain resources occupied by each subband signal in the frequency division system and the length of the short preamble, based on the set sequence, the orthogonal frequency division multiplexing (OFDM) method is used to generate subbands that are orthogonal to each other in the time domain A short preamble of the signal, wherein each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M of the OFDM data symbol, and M is a positive integer;

步骤1002，根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；Step 1002, according to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the long preamble, based on the set sequence, the long preamble of each subband signal orthogonal to each other in the time domain is generated by using OFDM, The length of the long preamble is one-Nth of the OFDM data symbol, and N is a positive integer;

本发明实施例以可用的频域带宽来设计前导码，每个子带信号的前导码使用子带内的频域资源，依据OFDM数据符号的长度可以确定长前导码的长度及短前导码的长度。In the embodiment of the present invention, the preamble is designed with the available frequency domain bandwidth. The preamble of each subband signal uses the frequency domain resources in the subband, and the length of the long preamble and the length of the short preamble can be determined according to the length of the OFDM data symbol. .

步骤1003，从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；Step 1003, intercepting a section of signal from the received signal and performing first time-domain correlation with the short preambles of each sub-band signal in the frequency division system, the received signal includes multiple sub-band signals;

可以根据短前导码的长度，从接收信号的起始位置截取不小于短前导码长度的一段信号与频分系统中各子带信号的短前导码进行第一时域相关。According to the length of the short preamble, a segment of signal not less than the length of the short preamble can be intercepted from the starting position of the received signal to perform first time domain correlation with the short preamble of each subband signal in the frequency division system.

基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，因此如果接收信号中存在某个子带信号时，与该子带信号的短前导码时域相关会有峰值出现。Based on the set sequence, the short preamble of each sub-band signal that is orthogonal to each other in the time domain is generated by using OFDM. Therefore, if there is a sub-band signal in the received signal, it is correlated with the short preamble of the sub-band signal in the time domain. There will be peaks.

步骤1004，根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；Step 1004: Determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the corresponding multiple subbands in the received signal according to the receiving time of the short preamble of each subband signal in the received signal The starting time point T0 of the long preamble of the signal;

对应接收信号中多个子带信号的长前导码的起始时间点T0为一个估计值，如果接收信号中各子带信号的短前导码同步，则时域相关结果中出现的各峰值在一个位置，如不同步，会出现多个时间位置的峰值，根据峰值出现的时刻可以估计一个大概的长前导码的起始时间点T0，具体的估计方法可以灵活确定，这里不做详细限定。The starting time point T0 of the long preamble corresponding to multiple subband signals in the received signal is an estimated value. If the short preambles of each subband signal in the received signal are synchronized, each peak value that appears in the time domain correlation result is at a position , if not synchronized, there will be peaks at multiple time positions. According to the time when the peaks appear, a rough start time T0 of the long preamble can be estimated. The specific estimation method can be flexibly determined, and will not be limited here.

步骤1005，根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；Step 1005, according to T0 and the length of the long preamble, intercept a section of signal from the received signal and perform second time domain correlation with the long preamble of each subband signal in the frequency division system;

所截取的信号长度不小于长前导码的长度。The length of the intercepted signal is not less than the length of the long preamble.

由于基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，因此如果接收信号中存在某个子带信号时，与该子带信号的长前导码时域相关会有峰值出现。Since the long preambles of sub-band signals that are orthogonal to each other in the time domain are generated by using OFDM based on the set sequence, if there is a sub-band signal in the received signal, the time domain of the long preamble of the sub-band signal There will be a peak in the correlation.

步骤1006，根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；Step 1006, determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

步骤1007，根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻。Step 1007, according to the receiving time of the long preamble of each sub-band signal in the received signal, determine the receiving time of the data symbol of each sub-band signal in the received signal.

优选地，上述设定序列为zadoff-chu序列，当然还可以是其它的序列。Preferably, the above-mentioned set sequence is a zadoff-chu sequence, and of course it can also be other sequences.

其中，Si(k)表示子带信号i的短前导码，Li(k)表示子带信号i的长前导码，i为子带信号的编号，L1为短前导码的长度，L2为长前导码的长度，a为子带信号i占用的频带编号的最小值，b为子带信号i占用的频带编号的最大值，q为设定参数，m为设定参数，k为时域采样点。Among them, Si(k) represents the short preamble of the subband signal i, Li(k) represents the long preamble of the subband signal i, i is the number of the subband signal, L1 is the length of the short preamble, and L2 is the long preamble The length of the code, a is the minimum value of the frequency band number occupied by the sub-band signal i, b is the maximum value of the frequency band number occupied by the sub-band signal i, q is the setting parameter, m is the setting parameter, and k is the time domain sampling point .

假定系统总带宽为10MHz、分为2个子带，每个子带的宽度是5MHz、Ts＝1/15360ms。It is assumed that the total system bandwidth is 10 MHz, which is divided into 2 sub-bands, the width of each sub-band is 5 MHz, and Ts=1/15360 ms.

前导码码总长度为1732个Ts(包括多个短前导码和/或多个长前导码)，其中768个Ts用于前端AGC，剩余的964个Ts用来做定时、频偏和信道估计。The total length of the preamble code is 1732 Ts (including multiple short preambles and/or multiple long preambles), of which 768 Ts are used for front-end AGC, and the remaining 964 Ts are used for timing, frequency offset and channel estimation .

每个短前导码长度为32，每个长前导码长度为512，数据符号长度是1024；The length of each short preamble is 32, the length of each long preamble is 512, and the length of the data symbol is 1024;

图11中0点左边的频域资源用于子带0，右边的频域资源用于子带1。The frequency domain resources on the left of point 0 in FIG. 11 are used for subband 0, and the frequency domain resources on the right are used for subband 1.

子带0长前导码的时域表达式为：The time domain expression of subband 0 long preamble is:

$L L 00 ((k k)) = = \frac{11}{512512} {Σ Σ}_{m m = = - - 149149}^{- - 11} {e e}^{- - \frac{jπ jπ}{149149} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{512512} * * m m * * k k}$

子带1长导码的时域表达式为：The time domain expression of subband 1 long preamble is:

$L L 11 ((k k)) = = \frac{11}{512512} {Σ Σ}_{m m = = 11}^{149149} {e e}^{- - \frac{jπ jπ}{149149} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{512512} * * m m * * k k}$

子带0短导码的时域表达式为：The time domain expression of subband 0 short preamble is:

$S S 00 ((k k)) = = \frac{11}{3232} {Σ Σ}_{m m = = - - 99}^{- - 11} {e e}^{- - \frac{jπ jπ}{99} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{3232} * * m m * * k k}$

$S S 11 ((k k)) = = \frac{11}{3232} {Σ Σ}_{m m = = 11}^{99} {e e}^{- - \frac{jπ jπ}{99} * * q q * * m m * * ((m m + + 11))} * * {e e}^{\frac{j j 22 π π}{512512} * * m m * * k k}$

可以证明子带0和1的长前导码在时域是正交的，子带0和1的短前导码在时域是正交的。It can be proved that the long preambles of subbands 0 and 1 are orthogonal in the time domain, and the short preambles of subbands 0 and 1 are orthogonal in the time domain.

将第一时域相关得到的序列中模值不大于设定门限M的离散点模值置零；Set the modulus value of the discrete point whose modulus value is not greater than the set threshold M in the sequence obtained by the first time domain correlation to zero;

完成与所有子带信号的短前导码第一时域相关后，序列中可能有一个非零的离散点，也可能有多个非零的离散点。After completing the first time-domain correlation of the short preamble with all sub-band signals, there may be one non-zero discrete point in the sequence, or there may be multiple non-zero discrete points.

如果非零的离散点只有一个，说明多个子带信号同步，即接收信号中各子带信号的短前导码的接收时刻均为t，确定T0为t；If there is only one non-zero discrete point, it means that multiple sub-band signals are synchronized, that is, the receiving time of the short preamble of each sub-band signal in the received signal is t, and T0 is determined to be t;

优选地，从T0+△开始截取一段不小于长前导码长度的接收信号与频分系统中各子带信号的长前导码进行第二时域相关，△为长前导码的前缀时间长度。Preferably, a section of received signals not less than the length of the long preamble is intercepted from T0+△ for second time-domain correlation with the long preambles of each subband signal in the frequency division system, and △ is the prefix time length of the long preamble.

将第二时域相关得到的序列中模值不大于设定门限P的离散点模值置零；Set the modulus value of the discrete point whose modulus value is not greater than the set threshold P in the sequence obtained by the second time domain correlation to zero;

基于同一发明构思，本发明实施例中还提供了一种接收定时检测装置，由于该装置解决问题的原理与一种接收机定时检测方法相似，因此该装置的实施可以参见方法的实施，重复之处不再赘述。Based on the same inventive concept, a receiving timing detection device is also provided in the embodiment of the present invention. Since the problem-solving principle of the device is similar to a receiver timing detection method, the implementation of the device can refer to the implementation of the method, and repeat I won't repeat them here.

本发明实施例提供一种接收定时检测装置，如图12所示，包括：An embodiment of the present invention provides a reception timing detection device, as shown in FIG. 12 , including:

第一时域相关单元1201，用于从接收信号中截取一段信号与本地短前导码进行第一时域相关，所述接收信号包括多个子带信号，所有的子带信号的短前导码与本地短前导码相同，且各子带信号除前导码使用全部的频域资源外其余部分使用不同的频域资源，不同子带信号的长前导码是基于同一本地基序列的不同设定时间偏移；The first time-domain correlation unit 1201 is configured to intercept a section of signal from the received signal and perform first time-domain correlation with the local short preamble. The short preambles are the same, and the subband signals use different frequency domain resources except the preamble uses all the frequency domain resources. The long preambles of different subband signals are based on different set time offsets of the same local base sequence ;

第一确定单元1202，用于根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；The first determining unit 1202 is configured to determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the corresponding receiving time according to the receiving time of the short preamble of each subband signal in the received signal. The starting time point T0 of the long preamble of multiple subband signals in the signal;

第二时域相关单元1203，用于根据T0及本地基序列的长度，从接收信号中截取一段信号与本地基序列进行第二时域相关；The second time-domain correlation unit 1203 is configured to intercept a section of signal from the received signal and perform second time-domain correlation with the local base sequence according to T0 and the length of the local base sequence;

第二确定单元1204，用于根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻；The second determining unit 1204 is configured to determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

第三确定单元1205，用于根据接收信号中各个子带信号的长前导码的接收时刻，确定接收信号中各个子带信号的数据符号的接收时刻。The third determining unit 1205 is configured to determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal.

对于每个非零的离散点，确定该离散点对应的时间点t_j，若时间窗[t_j-△1，t_j+△1]内该离散点的取值最大，则确定t_j为接收信号中子带信号的短前导码的接收时刻。For each non-zero discrete point, determine the time point t _j corresponding to the discrete point, if the value of the discrete point within the time window [t _j - △ 1, t _j + △ 1] is the largest, then determine t _j as The receiving time of the short preamble of the subband signal in the received signal.

对于每个非零的离散点，确定该离散点对应的时间点t_n，若时间窗[t_n-△1，t_n+△1]内该离散点的模值最大，则确定t_n为接收信号中子带信号的长前导码基于本地基序列偏移其中一个设定时间后的时刻；For each non-zero discrete point, determine the time point t _n corresponding to the discrete point, if the modulus value of the discrete point within the time window [t _n -△1, t _n +△1] is the largest, then determine t _n as The time after the long preamble of the sub-band signal in the received signal is offset by one of the set times based on the local base sequence;

根据t_n确定对应的设定时间，将t_n向前推移对应的设定时间，得到接收信号中一个子带信号的长前导码的接收时刻相对于T0的时间偏移量为t_△n；Determine the corresponding setting time according to t _n , move t _n forward to the corresponding setting time, and obtain the time offset of the receiving moment of the long preamble of a subband signal in the received signal relative to T0 as t _Δn ;

本发明实施例还提供另一种接收定时检测装置，如图13所示，包括：The embodiment of the present invention also provides another receiving timing detection device, as shown in Figure 13, including:

短前导码确定单元1301，用于根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；The short preamble determination unit 1301 is configured to generate the mutual sub-band information in the time domain based on the set sequence using OFDM based on the frequency domain resources occupied by each subband signal in the frequency division system and the length of the short preamble. Orthogonal short preambles of each sub-band signal, wherein each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M of the OFDM data symbol, and M is a positive integer;

长前导码确定单元1302，用于根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；The long preamble determination unit 1302 is configured to generate mutually orthogonal subbands in the time domain based on the set sequence in an OFDM manner according to the frequency domain resources occupied by each subband signal in the frequency division system and the length of the long preamble The long preamble of the signal, the length of the long preamble is one N/N of the OFDM data symbol, and N is a positive integer;

第一时域相关单元1303，用于从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；The first time domain correlation unit 1303 is configured to intercept a segment of the signal from the received signal and perform a first time domain correlation with the short preamble of each subband signal in the frequency division system, the received signal including multiple subband signals;

第一确定单元1304，用于根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；The first determining unit 1304 is configured to determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the corresponding receiving time according to the receiving time of the short preamble of each subband signal in the received signal. The starting time point T0 of the long preamble of multiple subband signals in the signal;

第二时域相关单元1305，用于根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；The second time domain correlation unit 1305 is used to intercept a section of signal from the received signal and perform second time domain correlation with the long preambles of each subband signal in the frequency division system according to T0 and the length of the long preamble;

第二确定单元1306，用于根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；The second determining unit 1306 is configured to determine the receiving time of the long preamble of each subband signal in the received signal according to the second time domain correlation result;

第三确定单元1307，用于根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻。The third determining unit 1307 is configured to determine the receiving time of the data symbols of each sub-band signal in the received signal according to the receiving time of the long preamble of each sub-band signal in the received signal.

优选地，第二确定单元根据第二时域相关结果确定接收信号中各个子带信号的长前导码的接收时刻，具体包括：Preferably, the second determining unit determines the receiving moment of the long preamble of each subband signal in the received signal according to the second time domain correlation result, specifically including:

对于每个非零的离散点，确定该离散点对应的时间点t_n，若时间窗[t_n-△1，t_n+△1]内该离散点的取值最大，则确定t_n为接收信号中子带信号的长前导码的接收时刻相对于T0的时间偏移量为t_△n；For each non-zero discrete point, determine the time point t _n corresponding to the discrete point, if the value of the discrete point within the time window [t _n -△1, t _n +△1] is the largest, then determine t _n as The time offset of the receiving moment of the long preamble of the subband signal relative to T0 in the received signal is t _Δn ;

本发明上述实施例中的接收定时检测装置为网络侧装置或用户侧装置。The reception timing detection device in the above embodiments of the present invention is a network side device or a user side device.

本发明实施例还提供一种接收定时检测装置，包括处理器和数据收发机，其中：The embodiment of the present invention also provides a receiving timing detection device, including a processor and a data transceiver, wherein:

所述处理器被配置为用于：根据频分系统中每个子带信号占用的频域资源及短前导码的长度，基于设定序列采用正交频分复用OFDM的方式生成在时域上相互正交的各子带信号的短前导码，其中，各子带信号占用不同的频域资源，短前导码的长度为OFDM数据符号的M分之一，M为正整数；根据频分系统中每个子带信号占用的频域资源及长前导码的长度，基于设定序列采用OFDM的方式生成在时域上相互正交的各子带信号的长前导码，长前导码的长度为OFDM数据符号的N分之一，N为正整数；从接收信号中截取一段信号与频分系统中各子带信号的短前导码进行第一时域相关，所述接收信号包括多个子带信号；根据第一时域相关结果确定接收信号中各子带信号的短前导码的接收时刻，根据接收信号中各子带信号的短前导码的接收时刻，确定对应接收信号中多个子带信号的长前导码的起始时间点T0；根据T0及长前导码的长度，从接收信号中截取一段信号与频分系统中各子带信号的长前导码进行第二时域相关；根据第二时域相关结果确定接收信号中各子带信号的长前导码的接收时刻；根据接收信号中各子带信号的长前导码的接收时刻，确定接收信号中各子带信号的数据符号的接收时刻；The processor is configured to: according to the frequency domain resource occupied by each subband signal in the frequency division system and the length of the short preamble, based on the set sequence, it is generated in the time domain by means of Orthogonal Frequency Division Multiplexing (OFDM). The short preambles of each sub-band signal that are orthogonal to each other, wherein each sub-band signal occupies different frequency domain resources, the length of the short preamble is one M of the OFDM data symbol, and M is a positive integer; according to the frequency division system The frequency domain resources occupied by each sub-band signal and the length of the long preamble, based on the set sequence, the long preamble of each sub-band signal that is orthogonal to each other in the time domain is generated by using OFDM, and the length of the long preamble is OFDM One-Nth of the data symbol, N is a positive integer; intercepting a section of signal from the received signal and performing first time-domain correlation with the short preamble of each sub-band signal in the frequency division system, the received signal includes multiple sub-band signals; Determine the receiving time of the short preamble of each subband signal in the received signal according to the first time domain correlation result, and determine the length of the multiple subband signals in the corresponding received signal according to the receiving time of the short preamble of each subband signal in the received signal The starting time point T0 of the preamble; according to the length of T0 and the long preamble, a section of signal is intercepted from the received signal and the long preamble of each subband signal in the frequency division system is correlated with the second time domain; according to the second time domain The correlation result determines the receiving moment of the long preamble of each subband signal in the received signal; according to the receiving moment of the long preamble of each subband signal in the received signal, determines the receiving moment of the data symbol of each subband signal in the received signal;

本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. a method of reception timing detection, is characterized in that, comprising:

From Received signal strength, intercepting a segment signal and the short lead code in this locality, to carry out the first time domain relevant, described Received signal strength comprises multiple subband signal, the short lead code of all subband signals is identical with the short lead code in this locality, and each subband signal remainder except lead code uses whole frequency domain resource uses different frequency domain resource, the long preambles code of different sub-band signal is the different set time migration based on same local basic sequence;

According to the time of reception of the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, according to the time of reception of the short lead code of subband signal each in Received signal strength, determine the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength;

According to the length of T0 and local basic sequence, from Received signal strength, intercepting a segment signal and local basic sequence, to carry out the second time domain relevant;

According to the time of reception of the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength;

According to the time of reception of the long preambles code of each subband signal in Received signal strength, determine the time of reception of the data symbol of each subband signal in Received signal strength.

2. the method for claim 1, is characterized in that, according to the time of reception of the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, specifically comprises:

In the sequence obtained of first time domain being correlated with, modulus value is not more than the discrete point modulus value zero setting of setting thresholding M;

For the discrete point of each non-zero, determine the time point t that this discrete point is corresponding _jfor the time of reception of the short lead code of subband signal in Received signal strength.

3. the method for claim 1, is characterized in that, according to the time of reception of the short lead code of subband signal each in Received signal strength, determines the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength, specifically comprises:

When the time of reception of the short lead code of each subband signal is t in Received signal strength, determine that T0 is t;

When the time of reception of the short lead code of each subband signal is multiple in Received signal strength, determine that T0 is the moment the most forward in the time of reception of the short lead code of each subband signal in Received signal strength; Or

When the time of reception of the short lead code of each subband signal is multiple in Received signal strength, determine that T0 is any instant in the time of reception of the short lead code of each subband signal in Received signal strength between the most forward moment and moment the most rearward.

4. the method for claim 1, is characterized in that, according to the length of T0 and local basic sequence, from Received signal strength, intercepting a segment signal and local basic sequence, to carry out the second time domain relevant, specifically comprises:

From T0+ △, intercepting one section of Received signal strength being not less than local basic sequence length and local basic sequence, to carry out the second time domain relevant, and △ is the prefix time length of long preambles code.

5. the method for claim 1, is characterized in that, according to the time of reception of the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength, specifically comprises:

In the sequence obtained of second time domain being correlated with, modulus value is not more than the discrete point modulus value zero setting of setting thresholding P;

For the discrete point of each non-zero, determine the time point t that this discrete point is corresponding _nif, time window [t _n-△ 1, t _n+ △ 1] in the modulus value of this discrete point maximum, then determine t _nfor the long preambles code of subband signal in Received signal strength offsets the moment after one of them setting-up time based on local basic sequence;

According to t _ndetermine corresponding setting-up time, by t _nthe setting-up time that reserve migration is corresponding, the time of reception obtaining the long preambles code of a subband signal in Received signal strength is t relative to the time offset of T0 _{△ n};

Be t according to T0 and time offset _{△ n}obtain the T0+t time of reception of subband signal long preambles code in Received signal strength _{△ n}.

6. method as claimed in claim 5, is characterized in that, according to the time of reception of the long preambles code of subband signal each in Received signal strength, determine the time of reception of the data symbol of each subband signal in Received signal strength, specifically comprise:

Determine that the reception starting point of data symbol j in Received signal strength equals T0+t _{△ n}+ T _cj+ △ 2, wherein T _cjbe data symbol j to the time gap of short lead code and long preambles code separation, △ 2 is timing adjustment amounts.

7. a method of reception timing detection, is characterized in that, comprising:

The frequency domain resource taken according to subband signal each in frequency division systems and the length of short lead code, the mode of orthogonal frequency division multiplex OFDM is adopted to be created on the short lead code of each subband signal mutually orthogonal in time domain based on setting sequence, wherein, each subband signal takies different frequency domain resource, the length of short lead code is M/mono-of OFDM data symbol, and M is positive integer;

The frequency domain resource taken according to subband signal each in frequency division systems and the length of long preambles code, the mode of OFDM is adopted to be created on the long preambles code of each subband signal mutually orthogonal in time domain based on setting sequence, the length of long preambles code is N/mono-of OFDM data symbol, and N is positive integer;

From Received signal strength, intercepting a segment signal and the short lead code of subband signal each in frequency division systems, to carry out the first time domain relevant, and described Received signal strength comprises multiple subband signal;

According to the length of T0 and long preambles code, from Received signal strength, intercepting a segment signal and the long preambles code of subband signal each in frequency division systems, to carry out the second time domain relevant;

According to the time of reception of the long preambles code of subband signal each in Received signal strength, determine the time of reception of the data symbol of each subband signal in Received signal strength.

8. method as claimed in claim 7, it is characterized in that, described setting sequence is zadoff-chu sequence.

9. method as claimed in claim 7 or 8, is characterized in that, adopt following formula to generate the short lead code of each subband signal:

Si (k) = \frac{1}{L 1} Σ_{m = a}^{b} e^{- \frac{jπ}{| b - a + 1 | |} * q * m * (m + 1)} * e^{\frac{j 2 π}{L 1} * m * k}

Following formula is adopted to generate the long preambles code of each subband signal:

Li (k) = \frac{1}{L 2} Σ_{m = a}^{b} e^{- \frac{jπ}{| b - a + 1 |} * q * m * (m + 1)} * e^{\frac{j 2 π}{L 2} * m * k}

Wherein, Si (k) represents the short lead code of subband signal i, Li (k) represents the long preambles code of subband signal i, and i is the numbering of subband signal, and L1 is the length of short lead code, L2 is the length of long preambles code, a is the minimum value of the frequency band number that subband signal i takies, and b is the maximum of the frequency band number that subband signal i takies, and q is setup parameter, m is setup parameter, and k is setting variable.

10. method as claimed in claim 7, is characterized in that, according to the time of reception of the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, specifically comprise:

11. methods as claimed in claim 7, is characterized in that, according to the time of reception of the short lead code of subband signal each in Received signal strength, determine the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength, specifically comprise:

12. methods as claimed in claim 7, is characterized in that, according to the length of T0 and long preambles code, from Received signal strength, intercepting a segment signal and the long preambles code of subband signal each in frequency division systems, to carry out the second time domain relevant, specifically comprises:

From T0+ △, intercepting one section of Received signal strength being not less than long preambles code length and the long preambles code of subband signal each in frequency division systems, to carry out the second time domain relevant, and △ is the prefix time length of long preambles code.

13. methods as claimed in claim 7, is characterized in that, according to the time of reception of the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength, specifically comprise:

For the discrete point of each non-zero, determine the time point t that this discrete point is corresponding _nfor time of reception of the long preambles code of subband signal in Received signal strength is t relative to the time offset of T0 _{△ n};

Be t according to T0 and time offset _{△ n}, obtain the T0+t time of reception of this subband signal long preambles code in Received signal strength _{△ n}.

14. methods as claimed in claim 13, is characterized in that, according to the time of reception of the long preambles code of subband signal each in Received signal strength, determine the time of reception of the data symbol of each subband signal in Received signal strength, specifically comprise:

Determine that the reception starting point of data symbol j equals T0+t _{△ n}+ T _cj+ △ 2, wherein T _cjbe data symbol j to the time gap of short lead code and long preambles code separation, △ 2 is timing adjustment amounts.

15. 1 kinds receive timing detection device, it is characterized in that, comprising:

First time domain correlation unit, for intercepting the short lead code in a segment signal and this locality from Received signal strength, to carry out the first time domain relevant, described Received signal strength comprises multiple subband signal, the short lead code of all subband signals is identical with the short lead code in this locality, and each subband signal remainder except lead code uses whole frequency domain resource uses different frequency domain resource, the long preambles code of different sub-band signal is the different set time migration based on same local basic sequence;

First determining unit, for the time of reception according to the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, according to the time of reception of the short lead code of subband signal each in Received signal strength, determine the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength;

Second time domain correlation unit, for the length according to T0 and local basic sequence, from Received signal strength, intercepting a segment signal and local basic sequence, to carry out the second time domain relevant;

Second determining unit, for the time of reception according to the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength;

3rd determining unit, for the time of reception of the long preambles code according to each subband signal in Received signal strength, determines the time of reception of the data symbol of each subband signal in Received signal strength.

16. devices as claimed in claim 15, is characterized in that, the first determining unit, according to the time of reception of the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, specifically comprises:

17. devices as claimed in claim 15, is characterized in that, the first determining unit, according to the time of reception of the short lead code of subband signal each in Received signal strength, is determined the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength, specifically comprised:

18. devices as claimed in claim 15, is characterized in that, the second time domain correlation unit is according to the length of T0 and local basic sequence, and from Received signal strength, intercepting a segment signal and local basic sequence, to carry out the second time domain relevant, specifically comprises:

19. devices as claimed in claim 15, is characterized in that, the second determining unit, according to the time of reception of the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength, specifically comprises:

According to t _ndetermine corresponding setting-up time, by t _nthe setting-up time that forward is corresponding, the time of reception obtaining the long preambles code of a subband signal in Received signal strength is t relative to the time offset of T0 _{△ n};

20. devices as claimed in claim 19, it is characterized in that, the 3rd determining unit, according to the time of reception of the long preambles code of subband signal each in Received signal strength, is determined the time of reception of the data symbol of each subband signal in Received signal strength, is specifically comprised:

21. 1 kinds receive timing detection device, it is characterized in that, comprising:

Short lead code determining unit, for the length of the frequency domain resource that takies according to subband signal each in frequency division systems and short lead code, the mode of orthogonal frequency division multiplex OFDM is adopted to be created on the short lead code of each subband signal mutually orthogonal in time domain based on setting sequence, wherein, each subband signal takies different frequency domain resource, the length of short lead code is M/mono-of OFDM data symbol, and M is positive integer;

Long preambles code determining unit, for the length of the frequency domain resource that takies according to subband signal each in frequency division systems and long preambles code, the mode of OFDM is adopted to be created on the long preambles code of each subband signal mutually orthogonal in time domain based on setting sequence, the length of long preambles code is N/mono-of OFDM data symbol, and N is positive integer;

First time domain correlation unit, for intercepting a segment signal and the short lead code of subband signal each in frequency division systems from Received signal strength, to carry out the first time domain relevant, and described Received signal strength comprises multiple subband signal;

Second time domain correlation unit, for the length according to T0 and long preambles code, from Received signal strength, intercepting a segment signal and the long preambles code of subband signal each in frequency division systems, to carry out the second time domain relevant;

3rd determining unit, for the time of reception of the long preambles code according to subband signal each in Received signal strength, determines the time of reception of the data symbol of each subband signal in Received signal strength.

22. devices as claimed in claim 21, it is characterized in that, described setting sequence is zadoff-chu sequence.

23. devices as described in claim 21 or 22, it is characterized in that, short lead code determining unit adopts following formula to generate the short lead code of each subband signal:

Si (k) = \frac{1}{L 1} Σ_{m = a}^{b} e^{- \frac{jπ}{| b - a + 1 | |} * q * m * (m + 1)} * e^{\frac{j 2 π}{L 1} * m * k}

Short lead code determining unit adopts following formula to generate the long preambles code of each subband signal:

Li (k) = \frac{1}{L 2} Σ_{m = a}^{b} e^{- \frac{jπ}{| b - a + 1 |} * q * m * (m + 1)} * e^{\frac{j 2 π}{L 2} * m * k}

24. devices as claimed in claim 21, is characterized in that, the first determining unit, according to the time of reception of the short lead code of each subband signal in the first time domain correlated results determination Received signal strength, specifically comprises:

25. devices as claimed in claim 21, is characterized in that, the first determining unit, according to the time of reception of the short lead code of subband signal each in Received signal strength, is determined the start time point T0 of the long preambles code of multiple subband signal in corresponding Received signal strength, specifically comprised:

26. devices as claimed in claim 21, is characterized in that, the second time domain correlation unit is according to the length of T0 and long preambles code, and from Received signal strength, intercepting a segment signal and the long preambles code of subband signal each in frequency division systems, to carry out the second time domain relevant, specifically comprises:

27. devices as claimed in claim 21, is characterized in that, the second determining unit, according to the time of reception of the long preambles code of each subband signal in the second time domain correlated results determination Received signal strength, specifically comprises:

The discrete point value zero setting of setting thresholding P is not more than in the sequence obtained of second time domain being correlated with;

28. devices as claimed in claim 27, is characterized in that the 3rd determining unit, for the time of reception of the long preambles code according to subband signal each in Received signal strength, is determined the time of reception of the data symbol of each subband signal in Received signal strength, specifically comprised: