WO2019000280A1

WO2019000280A1 - Transmission mode determination method and device

Info

Publication number: WO2019000280A1
Application number: PCT/CN2017/090574
Authority: WO
Inventors: 王凡; 拉赫曼•赛义德-哈比; 司小书; 欧阳涛
Original assignee: 华为技术有限公司
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2019-01-03

Abstract

A transmission mode determination method and device, which are used for solving the problem that the transmission mode determination method in the prior art cannot satisfy the requirement for a receiving end to quickly and accurately determine a transmission mode. The method involves: a receiving end combining each FFT length with each CP length in K CP lengths corresponding thereto to obtain H*K combination modes, one combination mode corresponding to one correlation value sequence; with regard to each combination mode, accumulating correlation values at the same data sample point position in each OFDM symbol among the multiple received OFDM symbols to obtain one accumulated value sequence, so as to obtain H*K accumulated value sequences; and finally, using a combination mode corresponding to an accumulated value sequence, in which an accumulated value with the maximum absolute value is located, among the H*K accumulated value sequences, as the transmission mode. The receiving end only needs to perform addition calculation based on the correlation value sequence, and the calculation complexity is low; and after the corresponding correlation values are accumulated, a peak value is highlighted, and a transmission mode can be accurately determined.

Description

一种传输模式确定方法及装置Transmission mode determining method and device

技术领域Technical field

本申请涉及通信技术领域，尤其涉及一种传输模式确定方法及装置。The present application relates to the field of communications technologies, and in particular, to a transmission mode determining method and apparatus.

背景技术Background technique

在正交频分复用(orthogonal frequency division multiplexing，OFDM)符号的传输过程中，为了消除符号间干扰(Inter Symbol Interference，ISI)和载波间干扰(inter carrier interference，ICI)，发送端会将一个OFDM符号最后一定长度的部分数据复制后***到所述OFDM符号的最前端，***的部分数据叫做循环前缀(cyclic prefix，CP)或者保护间隔(guard interval，GI)(以下均叫CP)，然后所述发送端将***了CP后变长了的数据作为新的OFDM符号发送给接收端。In the transmission of orthogonal frequency division multiplexing (OFDM) symbols, in order to eliminate Inter Symbol Interference (ISI) and inter-carrier interference (ICI), the transmitting end will A part of the data of a certain length of the OFDM symbol is copied and inserted into the forefront of the OFDM symbol, and the inserted part of the data is called a cyclic prefix (CP) or a guard interval (GI) (hereinafter referred to as CP), and then The transmitting end sends the data that has been lengthened after the CP is inserted as a new OFDM symbol to the receiving end.

具体的，新的OFDM符号的长度为实际有用数据(未***循环前缀的OFDM符号)的长度加上CP长度，其中，所述实际有用数据的长度等同于快速傅立叶变换(fast fourier transformation，FFT)长度。因此OFDM符号的传输模式可以表示为FFT长度和CP长度。在通信***中，受传输信道质量的影响，通常OFDM符号的传输模式会有多种，例如，FFT长度为2048、4096或8192，CP长度为FFT长度的1/4、1/8、1/16或1/32；又例如，FFT长度为4096或8192，CP长度为固定的196、256、512、768、1024等多种固定选择。Specifically, the length of the new OFDM symbol is the length of the actual useful data (the OFDM symbol without the cyclic prefix inserted) plus the CP length, wherein the length of the actual useful data is equivalent to the fast fourier transformation (FFT). length. Therefore, the transmission mode of the OFDM symbol can be expressed as the FFT length and the CP length. In the communication system, due to the quality of the transmission channel, there are usually multiple transmission modes of OFDM symbols. For example, the FFT length is 2048, 4096 or 8192, and the CP length is 1/4, 1/8, 1/ of the FFT length. 16 or 1/32; for example, the FFT length is 4096 or 8192, and the CP length is fixed 196, 256, 512, 768, 1024, and the like.

接收端在接收到OFDM符号后，要先确定OFDM符号的传输模式，即确定接收的OFDM符号的实际有用数据的长度(FFT长度)和CP长度，才能进行后续的解调处理。目前，接收端确定OFDM的传输模式的方法通常为以下两种：After receiving the OFDM symbol, the receiving end first determines the transmission mode of the OFDM symbol, that is, determines the length (FFT length) and CP length of the actual useful data of the received OFDM symbol, in order to perform subsequent demodulation processing. Currently, the method for determining the transmission mode of OFDM by the receiving end is usually the following two types:

第一种方法：接收端根据CP和实际有用数据之间的相关性，分别计算多种可选择的传输模式中每种传输模式下接收数据的相关值序列，以及计算对应的信号能量；再将每个相关值序列的绝对值与对应的信号能量的绝对值的商值与设定阈值进行比较，筛选出大于所述设定阈值的商值对应的传输模式中的FFT长度即为确定的目标传输模式中目标FFT长度，然后确定对应的相关值序列的绝对值的峰值区间的长度即为确定的目标传输模式中目标CP长度，这样接收端就确定了最终的目标传输模式。所述相关值序列中的每个相关值表示在多种传输模式中一种传输模式下接收数据的CP和实际有用数据之间的相关性。The first method: the receiving end separately calculates a sequence of correlation values of the received data in each of the plurality of selectable transmission modes according to the correlation between the CP and the actual useful data, and calculates a corresponding signal energy; The quotient of the absolute value of each correlation value sequence and the absolute value of the corresponding signal energy is compared with a set threshold, and the FFT length in the transmission mode corresponding to the quotient value greater than the set threshold is selected as the determined target. The length of the target FFT in the transmission mode, and then determining the length of the peak interval of the absolute value of the corresponding correlation value sequence is the target CP length in the determined target transmission mode, so that the receiving end determines the final target transmission mode. Each of the correlation value sequences represents a correlation between a CP that receives data in one of a plurality of transmission modes and actual useful data.

在这种方法中，接收端在计算相关值序列的同时还要计算信号能量，计算量较大，计算复杂度高；此外当CP长度接近的情况下，使得峰值区间的长度不准确，进而使确定最终的传输模式不准确。In this method, the receiving end calculates the signal energy while calculating the sequence of correlation values, the calculation amount is large, and the calculation complexity is high; in addition, when the CP length is close, the length of the peak interval is inaccurate, thereby making Make sure the final transmission mode is not accurate.

第二种方法：接收端选取固定的CP长度后，根据CP和实际有用数据之间的相关性，分别计算可选择的传输模式中每种FFT的长度下接收数据的相关值序列；然后检测相关值序列的绝对值的多个连续的峰值区间，查找到前后两个峰值区间之间的距离的最大值，查找到的所述最大值为FFT长度和CP长度之和，进而确定两个峰值区间中前一个峰值区间的长度为确定的目标传输模式中目标FFT长度，所述最大值与目标FFT长度的差为确定的目标传输模式中目标CP长度，这样接收端就确定了最终的目标传输模式。The second method: after the receiving end selects a fixed CP length, according to the correlation between the CP and the actual useful data, respectively calculate a sequence of correlation values of the received data in the length of each FFT in the selectable transmission mode; A plurality of consecutive peak intervals of absolute values of the sequence of values, finding the maximum value of the distance between the two peak ranges before and after, and finding the maximum value as the sum of the FFT length and the CP length, thereby determining two peak intervals The length of the previous peak interval is the target FFT length in the determined target transmission mode, and the difference between the maximum value and the target FFT length is the target CP length in the determined target transmission mode, so that the receiving end determines the final target transmission mode. .

在这种方法中，虽然相对于第一种方法计算量小，计算复杂度低，但是在传输环境恶劣的情况下，峰值不易凸显，使得接收端不能准确确定传输模式。 In this method, although the calculation amount is small compared with the first method, the calculation complexity is low, but in the case where the transmission environment is bad, the peak is not easily highlighted, so that the receiving end cannot accurately determine the transmission mode.

综上所述，现有的传输模式确定方法要么计算复杂度高，要么不能准确确定传输模式，不能满足接收端快速准确地确定传输模式的需求。In summary, the existing transmission mode determining method either has high computational complexity or cannot accurately determine the transmission mode, and cannot meet the requirement of the receiving end to quickly and accurately determine the transmission mode.

发明内容Summary of the invention

本申请实施例提供了一种传输模式确定方法及装置，用以解决现有技术中的传输模式确定方法不能满足接收端快速准确地确定传输模式需求的问题。The embodiment of the present application provides a method and a device for determining a transmission mode, which are used to solve the problem that the transmission mode determining method in the prior art cannot meet the requirement of the receiving end to quickly and accurately determine the transmission mode.

第一方面，本申请实施例提供了一种传输模式确定方法，应用于正交频分复用OFDM***，该方法包括：In a first aspect, an embodiment of the present application provides a transmission mode determining method, which is applied to an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system, where the method includes:

接收端针对H个快速傅立叶变换FFT长度中每个FFT长度对应的K个循环前缀CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；然后所述接收端针对每种组合模式，将接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；最后所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列。The receiving end combines each FFT length with each of the K CP lengths to obtain an H*K combination for each of the K cyclic prefix CP lengths corresponding to each FFT length of the H fast Fourier transform FFT lengths. a mode; a combined mode corresponding to a sequence of correlation values, the correlation value sequence being calculated based on a preset CP fixed length and an FFT length in the combined mode; and then the receiving end is for each combined mode, Accumulating correlation values of the same data sample point positions in each OFDM symbol in the received multiple OFDM symbols to obtain one accumulated value sequence; finally, the receiving end maximizes the absolute value in the H*K accumulated value sequences a combined mode corresponding to the accumulated value sequence in which the accumulated value is located as a transmission mode; wherein H and K are positive integers, each FFT length corresponding to K combined modes; and the same data of each OFDM symbol in the plurality of OFDM symbols The position is determined based on the CP length and the FFT length in the combined mode; the H*K combination mode corresponds to H*K accumulated value sequences.

通过上述方法，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此该方法可以满足接收端快速准确地确定传输模式的需求。Through the above method, the receiving end only needs to perform addition calculation based on the correlation value sequence, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, so the method It can meet the needs of the receiving end to quickly and accurately determine the transmission mode.

在一个可能的设计中，所述接收端可以先基于所述CP固定长度，计算接收的多个OFDM符号分别在所述H个FFT长度中每个FFT长度下的相关值序列，得到H个相关值序列。然后在所述接收端得到所述H*K种组合模式后，再分别将与每种组合模式中的FFT长度对应的相关值序列，与所述组合模式对应。这样，一种组合模式就与一个相关值序列对应。In a possible design, the receiving end may first calculate a sequence of correlation values of each of the received OFDM symbols in each of the H FFT lengths based on the fixed length of the CP, to obtain H correlations. Sequence of values. Then, after the H*K combination mode is obtained at the receiving end, the correlation value sequence corresponding to the FFT length in each combination mode is respectively associated with the combination mode. Thus, a combined mode corresponds to a sequence of related values.

在一个可能的设计中，所述接收端基于所述CP固定长度和所述组合模式中的FFT长度计算得到所述相关值序列，具体可以包括以下步骤：In a possible design, the receiving end calculates the sequence of correlation values based on the fixed length of the CP and the FFT length in the combined mode, and specifically includes the following steps:

所述接收端对多个OFDM符号进行FFT处理，得到FFT处理后的数据，并将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行快速傅里叶逆变换(inverse fast fourier transform，IFFT)处理，得到N_seg段IFFT处理后的数据；然后，所述接收端根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列；最后，所述接收端将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列；其中，N_seg为2t，t为正整数。The receiving end performs FFT processing on a plurality of OFDM symbols to obtain FFT processed data, and divides the FFT processed data into N _seg segments, and performs fast Fourier inverse on each FFT processed data. Inverse fast fourier transform (IFFT) processing, to obtain N _seg segment IFFT processed data; then, the receiving end calculates each IFFT processed according to the CP fixed length, N _seg and the FFT length a sequence of correlation values of the data, and a sequence of correlation values corresponding to the data processed by the N _seg segment IFFT is obtained; finally, the receiving end compares the same data in each of the IFFT processed data in the N _seg segment IFFT processed data. At the sampling point position, the corresponding correlation values in the sequence of correlation values corresponding to the data after the IFFT processing of the N _seg segment are added to obtain the sequence of correlation values; wherein N _seg is 2t, and t is a positive integer.

通过上述方法，所述接收端可以准确地得到每种组合模式对应的相关值序列，以使所述接收端准确地将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加。Through the foregoing method, the receiving end can accurately obtain a correlation value sequence corresponding to each combination mode, so that the receiving end accurately accumulates correlation values of the same data sampling point positions in each OFDM symbol in multiple OFDM symbols. .

在一个可能的设计中，所述接收端可以通过如下公式，对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据Y'：In a possible design, the receiving end may perform FFT processing on the plurality of OFDM symbols by using the following formula to obtain FFT processed data Y':

Y'＝FFT(Y,L_FFT)Y'=FFT(Y,L _FFT )

其中，Y为所述多个OFDM符号，L_FFT为所述组合模式中的FFT长度。 Where Y is the plurality of OFDM symbols and L _FFT is the FFT length in the combined mode.

通过上述方法，所述接收端可以准确地得到FFT处理后的数据。Through the above method, the receiving end can accurately obtain the FFT processed data.

在一个可能的设计中，所述接收端将所述FFT处理后的数据均分成N_seg段，也可以叫做分成N_seg个子带。In a possible design, the receiving end divides the FFT processed data into N _seg segments, which may also be called N _seg subbands.

在一个可能的设计中，所述接收端可以通过如下公式，对每段FFT处理后的数据进行IFFT处理，得到该段IFFT处理后的数据y_l：In a possible design, the receiving end may perform IFFT processing on each piece of FFT processed data by using the following formula to obtain the data of the IFFT processed data y _l :

其中，y_l为第l段IFFT处理后的数据，idx为Y'的索引，

Where y _l is the data of the 1st segment of the IFFT processing, and the idx is the index of the Y'.

通过上述方法，所述接收端可以准确地得到每段IFFT处理后的数据。Through the above method, the receiving end can accurately obtain the data after each IFFT processing.

在一个可能的设计中，所述接收端可以通过如下公式，计算每段IFFT处理后的数据的相关值序列z_l(p)：In a possible design, the receiving end may calculate a sequence of correlation values z _l (p) of each piece of IFFT processed data by the following formula:

其中，y_l(p-q)为第l段IFFT处理后的数据中数据采样点位置为(p-q)的数据；p表示第l段IFFT处理后的数据中的任一数据采样点位置；q为相对于数据采样点位置p的偏移量；

为第l段IFFT处理后的数据中数据采样点位置为

的数据的共轭；L_cont为所述CP固定长度。Where y _l (pq) is the data of the data sampling point position (pq) in the data of the 1st segment of the IFFT processing; p represents the position of any data sampling point in the data of the 1st segment of the IFFT processing; q is the relative The offset of the data sample point position p;

The data sampling point position in the data processed by the 1st segment IFFT is

Conjugation of the data; L _cont is the fixed length of the CP.

通过上述方法，所述接收端可以准确地得到每段IFFT处理后的数据的相关值序列，以使后续准确地得到所述组合模式对应的相关值序列。Through the above method, the receiving end can accurately obtain a sequence of correlation values of each piece of IFFT processed data, so that the correlation value sequence corresponding to the combined mode is accurately obtained subsequently.

在一个可能的设计中，得到的所述组合模式对应的所述相关值序列z(p)，符合如下公式：In a possible design, the obtained correlation value sequence z(p) corresponding to the combined mode is in accordance with the following formula:

通过上述方法，所述接收端可以准确地得到所述组合模式对应的相关值序列。Through the above method, the receiving end can accurately obtain the sequence of correlation values corresponding to the combined mode.

在一个可能的设计中，所述接收端可以采用如下公式，得到每种组合模式对应的相关值序列x(n)：In a possible design, the receiving end may adopt the following formula to obtain a sequence of correlation values x(n) corresponding to each combination mode:

其中，y(n-i)为多个OFDM符号中数据采样点位置为(n-i)的数据；n表示所述多个OFDM符号中的任一数据采样点位置；i为相对于数据采样点位置n的偏移量；y^*(n-i-N_FFT)为所述多个OFDM符号中数据采样点位置为(n-i-N_FFT)的数据的共轭；N_FFT为该组合模式中的FFT长度，N_cont为所述CP固定长度。 Where y(ni) is data of a data sample point position (ni) in a plurality of OFDM symbols; n represents a position of any one of the plurality of OFDM symbols; i is a position n relative to the data sample point An offset; y ^* (niN _FFT ) is a conjugate of data in the plurality of OFDM symbols with a data sample point position of (niN _FFT ); N _FFT is an FFT length in the combined mode, and N _cont is the CP Fixed length.

在一个可能的设计中，所述多个OFDM符号可以为所述接收端接收的全部信号，也可以为所述接收端接收的全部信号中的部分信号。In a possible design, the multiple OFDM symbols may be all signals received by the receiving end, or may be part of all signals received by the receiving end.

在一个可能的设计中，所述接收端针对每个OFDM符号包含的多个数据采样点，在每种组合模式对应的相关值序列中，分别确定每个OFDM符号中相同数据采样点位置的相关值，并将相同数据采样点位置的相关值累加，得到累加值序列。In a possible design, the receiving end determines, for each of the plurality of data sampling points included in each OFDM symbol, a correlation of the same data sampling point position in each OFDM symbol in a correlation value sequence corresponding to each combined mode. The value and the associated values of the same data sample point locations are accumulated to obtain a sequence of accumulated values.

通过上述方法，所述接收端可以准确地针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列。Through the above method, the receiving end can accurately accumulate correlation values of the same data sampling point positions in each OFDM symbol in multiple OFDM symbols for each combined mode to obtain one accumulated value sequence.

在一个可能的设计中，每种组合传输模式对应的累加值序列z_avg(r)，符合如下公式：In a possible design, the cumulative value sequence z_avg(r) corresponding to each combined transmission mode conforms to the following formula:

其中，r为累加值序列的索引值，1≤r≤(L_FFT+L_CP)/N_seg；L_CP为该组合模式中的CP长度；z(r+s×(L_FFT+L_CP)/N_seg)为所述多个OFDM符号中数据采样点位置为(r+s×(L_FFT+L_CP)/N_seg)的相关值；S为所述多个OFDM符号的总个数。Where r is the index value of the accumulated value sequence, 1 ≤ r ≤ (L _FFT + L _CP ) / N _seg ; L _CP is the CP length in the combined mode; z (r + s × (L _FFT + L _CP ) /N _seg ) is a correlation value of a data sample point position in the plurality of OFDM symbols (r+s×(L _FFT +L _CP )/N _seg ); S is a total number of the plurality of OFDM symbols.

通过上述方法，所述接收端可以准确地得到每种组合模式对应的累加值序列。Through the above method, the receiving end can accurately obtain the accumulated value sequence corresponding to each combined mode.

在一个可能的设计中，每种组合传输模式对应的累加值序列x_avg(j)，符合以下公式：In a possible design, the cumulative value sequence x_avg(j) corresponding to each combined transmission mode conforms to the following formula:

其中，j为累加值序列的索引值，1≤j≤(N_FFT+N_CP)；N_CP为该组合模式中的CP长度；x(j+m×(N_FFT+N_CP))为所述多个OFDM符号中数据采样点位置为(j+m×(N_FFT+N_CP))的相关值；Q为所述多个OFDM符号的总个数。Where j is the index value of the accumulated value sequence, 1 ≤ j ≤ (N _FFT + N _CP ); N _CP is the CP length in the combined mode; x (j + m × (N _FFT + N _CP )) is The data sample point position in the plurality of OFDM symbols is a correlation value of (j + m × (N _FFT + N _CP )); Q is a total number of the plurality of OFDM symbols.

在一个可能的设计中，所述接收端在将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式之前，可以先将所述H*K个累加值序列中的每个累加值序列包含的多个累加值处理成绝对值。这样，所述接收端可以快速准确地找到绝对值最大的一个累加值，进而准确地找到绝对值最大的该累加值所在的累加值序列。In a possible design, the receiving end may firstly use the combined mode corresponding to the accumulated value sequence in which the absolute value of the H*K accumulated value sequence is the largest as the transmission mode. A plurality of accumulated values included in each of the H*K accumulated value sequences are processed into absolute values. In this way, the receiving end can quickly and accurately find an accumulated value with the largest absolute value, thereby accurately finding the accumulated value sequence in which the accumulated value having the largest absolute value is located.

在一个可能的设计中，所述接收端在将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式之后，所述接收端还执行以下步骤：In a possible design, after the receiving end uses the combined mode corresponding to the accumulated value sequence in which the absolute value of the H*K accumulated value sequences is the largest, the receiving end is further Perform the following steps:

所述接收端基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围，并以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。通过上述方法，所述接收端可以准确地实现符号同步。The receiving end determines, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data sampling point position range in which the absolute value of the accumulated value is greater than a set threshold and includes an accumulated value with the largest absolute value, and The plurality of OFDM symbols are synchronized based on an intermediate data sample point position in the data sample point location range. Through the above method, the receiving end can accurately implement symbol synchronization.

在一个可能的设计中，所述设定阈值可以为最大的绝对值的50％或60％等比例，还可以根据实际情况具体取值。通过上述方法，所述接收端可以灵活准确地确定所述数据采样点位置范围，以使后续准确对所述多个OFDM符号进行同步。In a possible design, the set threshold may be a ratio of 50% or 60% of the maximum absolute value, and may also be specifically determined according to actual conditions. Through the above method, the receiving end can flexibly and accurately determine the location range of the data sampling point, so as to accurately synchronize the multiple OFDM symbols.

在一个可能的设计中，所述接收端可以通过以下步骤确定所述数据采样点位置范围： In a possible design, the receiving end may determine the data sampling point location range by the following steps:

所述接收端首先将绝对值最大的一个累加值所在的累加值序列中包括的多个累加值的绝对值，绘制到以OFDM符号中的数据采样点位置为横坐标、以累加值的绝对值为纵坐标的坐标系中，生成波形图；然后，所述接收端在所述波形图中确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的目标区间，并确定所述目标区间映射到所述横坐标中对应的所述数据采样点位置范围。The receiving end firstly draws the absolute value of the plurality of accumulated values included in the accumulated value sequence in which the accumulated value of the largest absolute value is located to the abscissa of the data sampling point position in the OFDM symbol, and the absolute value of the accumulated value a waveform diagram is generated in the coordinate system of the ordinate; then, the receiving end determines, in the waveform diagram, a target interval in which the absolute value of the accumulated value is greater than a set threshold and includes an accumulated value of the absolute maximum value, And determining that the target interval is mapped to the corresponding data sample point location range in the abscissa.

通过上述方法，所述接收端可以灵活准确地确定所述数据采样点位置范围，以使后续准确对所述多个OFDM符号进行同步。Through the above method, the receiving end can flexibly and accurately determine the location range of the data sampling point, so as to accurately synchronize the multiple OFDM symbols.

在一个可能的设计中，所述接收端可以采用如下方法确定所述数据采样点位置范围：In a possible design, the receiving end may determine the data sampling point location range by using the following method:

所述接收端在所述绝对值最大的一个累加值前后的累加值中，以该累加值为起点，确定该累加值的前边第一个绝对值小于所述设定阈值的第一累加值，以及确定该累加值的后边第一个绝对值小于所述设定阈值的第二累加值；然后再确定所述第一绝对值和所述第二绝对值分别对应的第一数据采样点位置和第二数据采样点位置，此时，所述第一数据采样点位置的下一个数据采样点位置到所述第二数据采样点位置的前一个数据采样点位置的范围，即为所述数据采样点位置范围。The receiving end determines, in the accumulated value before and after the accumulated value of the absolute maximum value, the first accumulated value of the first absolute value of the accumulated value is less than the first accumulated value of the set threshold by using the accumulated value as a starting point. And determining a second accumulated value of the first absolute value of the accumulated value that is smaller than the set threshold; and then determining a first data sample point position corresponding to the first absolute value and the second absolute value respectively a second data sampling point position, wherein the range of the next data sampling point position of the first data sampling point position to the previous data sampling point position of the second data sampling point position is the data sampling Point location range.

第二方面，本申请实施例还提供了一种接收端，该接收端具有实现上述方法实例中接收端行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。In a second aspect, the embodiment of the present application further provides a receiving end, where the receiving end has a function of implementing the behavior of the receiving end in the foregoing method instance. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

在一个可能的设计中，所述接收端的结构中包括处理单元和确定单元，这些单元可以执行上述方法示例中的相应功能，具体参见方法示例中的详细描述，此处不做赘述。In a possible design, the structure of the receiving end includes a processing unit and a determining unit, and the unit can perform the corresponding functions in the foregoing method examples. For details, refer to the detailed description in the method example, which is not described herein.

在一种可能的设计中，所述接收端的结构中包括收发器、处理器和存储器，所述收发器用于与OFDM***中的其他设备进行通信交互，所述处理器被配置为支持所述接收端执行上述方法中相应的功能。所述存储器与所述处理器耦合，其保存所述接收端必要的程序指令和数据。In a possible design, the structure of the receiving end includes a transceiver, a processor and a memory for communicating with other devices in the OFDM system, the processor being configured to support the receiving The end performs the corresponding function in the above method. The memory is coupled to the processor, which stores program instructions and data necessary for the receiving end.

第三方面，本申请实施例还提供了一种OFDM***，所述OFDM***包括发送端和接收端。In a third aspect, an embodiment of the present application further provides an OFDM system, where the OFDM system includes a transmitting end and a receiving end.

第四方面，本申请实施例还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令在被所述计算机调用时用于使所述计算机执行上述任一种方法。In a fourth aspect, the embodiment of the present application further provides a computer storage medium, where the computer storage medium stores computer executable instructions, where the computer executable instructions are used to cause the computer to execute when called by the computer. Any of the above methods.

本申请实施例的技术方案中，接收端针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；所述接收端针对每种组合模式，将接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列，进而得到所述H*K种组合模式对应的H*K个累加值序列；最后，所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。在该方法中，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此该方法可以满足接收端快速准确地确定传输模式的需求。 In the technical solution of the embodiment of the present application, the receiving end combines each FFT length with each of the K CP lengths for each K lengths corresponding to each FFT length of the H FFT lengths to obtain H. *K combination mode; wherein a combination mode corresponds to a correlation value sequence, the correlation value sequence is calculated based on a preset CP fixed length and an FFT length in the combination mode; For each combination mode, the correlation values of the same data sample point positions in each OFDM symbol in the received OFDM symbols are accumulated to obtain one accumulated value sequence, thereby obtaining H*K corresponding to the H*K combination mode. The cumulative value sequence; finally, the receiving end uses the combined mode corresponding to the accumulated value sequence in which the absolute value of the H*K accumulated value sequence is the largest, as the transmission mode. In the method, the receiving end only needs to perform addition calculation based on the correlation value sequence, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, so the The method can meet the requirement of the receiving end to quickly and accurately determine the transmission mode.

附图说明DRAWINGS

图1为本申请实施例提供的一种OFDM***的架构示意图；FIG. 1 is a schematic structural diagram of an OFDM system according to an embodiment of the present disclosure;

图2为本申请实施例提供的一种传输模式确定方法的流程图；2 is a flowchart of a method for determining a transmission mode according to an embodiment of the present application;

图3为本申请实施例提供的组合模式、FFT长度以及相关值序列之间的对应关系的示意图；FIG. 3 is a schematic diagram of a correspondence between a combination mode, an FFT length, and a sequence of correlation values according to an embodiment of the present application;

图4为本申请实施例提供的一种基于累加值序列生成的波形图；4 is a waveform diagram generated based on an accumulated value sequence according to an embodiment of the present application;

图5为本申请实施例提供的一种接收端的结构示意图；FIG. 5 is a schematic structural diagram of a receiving end according to an embodiment of the present application;

图6为本申请实施例提供的一种接收端的结构图。FIG. 6 is a structural diagram of a receiving end according to an embodiment of the present application.

具体实施方式Detailed ways

下面将结合附图对本申请实施例作进一步地详细描述。The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

本申请实施例提供一种传输模式确定方法及装置，用以解决现有技术中传输模式确定方法要么计算复杂度高，要么不能准确确定传输模式，不能满足接收端快速准确地确定传输模式需求的问题。其中，本申请所述方法和装置基于同一发明构思，由于方法及装置解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。The embodiment of the present application provides a method and a device for determining a transmission mode, which are used to solve the problem that the transmission mode determination method in the prior art has high computational complexity or cannot accurately determine the transmission mode, and cannot meet the requirements of the receiving end to quickly and accurately determine the transmission mode. problem. The method and the device of the present application are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.

本申请实施例的技术方案中，接收端针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；所述接收端针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列，进而得到所述H*K种组合模式对应的H*K个累加值序列；最后，所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。在该方法中，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此该方法可以满足接收端快速准确地确定传输模式的需求。In the technical solution of the embodiment of the present application, the receiving end combines each FFT length with each of the K CP lengths for each K lengths corresponding to each FFT length of the H FFT lengths to obtain H. *K combination mode; wherein a combination mode corresponds to a correlation value sequence, the correlation value sequence is calculated based on a preset CP fixed length and an FFT length in the combination mode; For each combination mode, the correlation values of the same data sample point positions in each OFDM symbol in the plurality of OFDM symbols are accumulated to obtain one accumulated value sequence, thereby obtaining H*K accumulated values corresponding to the H*K combination modes. Sequence: Finally, the receiving end uses, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest. In the method, the receiving end only needs to perform addition calculation based on the correlation value sequence, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, so the The method can meet the requirement of the receiving end to quickly and accurately determine the transmission mode.

以下，对本申请中的部分用语进行解释说明，以便于本领域技术人员理解。Hereinafter, some of the terms in the present application will be explained to be understood by those skilled in the art.

1)、接收端，为OFDM***中接收OFDM符号的设备，可以但不限是车载设备、计算设备、移动台(mobile station，MS)或其他处理设备等，以及经接入网与一个或多个核心网进行通信的移动终端；还可以是固定终端，例如电缆调制解调器(cable modem，CM)等。1) The receiving end is a device for receiving an OFDM symbol in an OFDM system, which may be, but is not limited to, an in-vehicle device, a computing device, a mobile station (MS) or other processing device, and the access network and one or more A mobile terminal that communicates with the core network; it may also be a fixed terminal, such as a cable modem (CM).

2)、CP，指将一个OFDM符号最后一定长度的部分数据复制后***到所述OFDM符号的最前端后，所述***的部分数据即为所述CP，其中，所述CP又称之为GI。2), CP, after copying a part of data of a certain length of an OFDM symbol and inserting it into the forefront of the OFDM symbol, the inserted partial data is the CP, wherein the CP is also called GI.

3)、CP长度，为一个OFDM符号最前端***的部分数据的长度，也可以理解为位于一个OFDM符号中最前端，且与最后端相同部分数据的长度，即CP的长度。本申请实施例中，所述CP长度可以指示一个OFDM符号中的CP包含的数据采样点的个数。3) The length of the CP, which is the length of the partial data inserted at the forefront of an OFDM symbol, can also be understood as the length of the data at the forefront of the OFDM symbol and the same portion as the last end, that is, the length of the CP. In this embodiment, the CP length may indicate the number of data sampling points included in the CP in one OFDM symbol.

本申请实施例中，一个FFT长度对应K个CP长度，其中，所述K个CP长度可以分别为所述FFT长度的1/4、1/8、1/16或1/32等，或者分别为196、256、512、768、1024等。In this embodiment, an FFT length corresponds to K CP lengths, where the K CP lengths may be 1/4, 1/8, 1/16, or 1/32 of the FFT length, respectively. It is 196, 256, 512, 768, 1024, etc.

4)、CP固定长度，为预设的CP长度，指示可以用来计算得到相关值序列的数据的长度或者数据采样点个数。可选的，所述CP固定长度可以叫做固定相关长度或者固定相关点数。4), CP fixed length, which is the preset CP length, indicating the length of data that can be used to calculate the sequence of related values Degree or number of data sampling points. Optionally, the fixed length of the CP may be called a fixed correlation length or a fixed correlation point.

5)、传输模式，为FFT长度和CP长度的组合模式，用于指示OFDM符号在传输过程中，所述OFDM符号中的实际有用数据和CP各自的长度，以使接收端根据该传输模式进行后续对所述OFDM符号的解调，得到有用数据。5) a transmission mode, which is a combination mode of an FFT length and a CP length, for indicating the actual useful data and the respective lengths of the CPs in the OFDM symbol during transmission, so that the receiving end performs according to the transmission mode. Subsequent demodulation of the OFDM symbols yields useful data.

6)、相关值序列，为包含多个相关值的序列。本申请实施例中，由于多个OFDM符号内每个OFDM符号中CP是由所述OFDM符号的最后端部分数据复制而来，即所述OFDM符号中的CP与最后端的部分数据相同，因此两者具有相关性，这样可以根据上述相关性计算所述多个OFDM符号中每个数据采样点位置的数据的相关值，得到多个相关值，组成相关值序列。6) A sequence of correlation values, which is a sequence containing a plurality of correlation values. In the embodiment of the present application, since the CP in each OFDM symbol in multiple OFDM symbols is copied from the data of the last part of the OFDM symbol, that is, the CP in the OFDM symbol is the same as the data in the last end, so Correspondingly, the correlation value of the data of each data sampling point position in the plurality of OFDM symbols is calculated according to the correlation, and a plurality of correlation values are obtained to form a correlation value sequence.

具体的，在本申请实施例中，接收端基于预设的CP固定长度和H个FFT长度中每个FFT长度，分别进行相关值计算，可以得到H个均包含多个相关值的序列，即得到H个相关值序列。Specifically, in the embodiment of the present application, the receiving end performs correlation value calculation based on the preset fixed length of the CP and the length of each FFT of the H FFT lengths, so that H sequences each containing multiple correlation values may be obtained, that is, A sequence of H correlation values is obtained.

7)、多个，是指两个或两个以上。7), multiple, means two or more.

为了更加清晰地描述本申请实施例的技术方案，下面结合附图，对本申请实施例提供的传输模式确定方法及装置进行详细说明。In order to more clearly describe the technical solutions of the embodiments of the present application, the transmission mode determining method and apparatus provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

图1示出了本申请实施例提供的传输模式确定方法适用的一种可能的OFDM***，所述OFDM***的架构包括：发送端和接收端。其中：FIG. 1 shows a possible OFDM system to which the transmission mode determining method provided by the embodiment of the present application is applicable, and the architecture of the OFDM system includes: a transmitting end and a receiving end. among them:

所述发送端向所述接收端发送OFDM符号，具体的，所述发送端和所述接收端在所述OFDM符号的传输过程中分别至少执行以下操作：The transmitting end sends an OFDM symbol to the receiving end. Specifically, the sending end and the receiving end perform at least the following operations in the transmission process of the OFDM symbol:

所述发送端先对要发送的原始OFDM符号进行调制，对调制后的原始OFDM符号进行IFFT处理；然后在对进行了IFFT处理的原始OFDM符号***CP；最后将***了CP得到的新的OFDM符号发送给所述接收端；其中，所述原始OFDM符号为有用数据；The transmitting end first modulates the original OFDM symbol to be transmitted, performs IFFT processing on the modulated original OFDM symbol, and then inserts the CP into the original OFDM symbol subjected to the IFFT processing; and finally inserts the new OFDM obtained by the CP. Sending a symbol to the receiving end; wherein the original OFDM symbol is useful data;

所述接收端接收到所述发送端发送的OFDM符号时，先确定接收的所述OFDM符号的传输模式，即接收的所述OFDM符号中包含的原始OFDM符号的长度(即FFT长度)和***的CP的长度(即CP长度)；然后对接收的所述OFDM符号进行去除CP处理，并对去除了CP的OFDM符号进行FFT处理；最后对FFT处理后的OFDM符号进行解调，得到有用数据(即所述发送端要发送的所述原始OFDM符号)。When receiving the OFDM symbol sent by the sending end, the receiving end first determines a transmission mode of the received OFDM symbol, that is, a length of the original OFDM symbol (ie, an FFT length) and an insertion included in the received OFDM symbol. Length of the CP (ie, CP length); then performing CP removal processing on the received OFDM symbol, and performing FFT processing on the OFDM symbol with the CP removed; finally demodulating the OFDM processed OFDM symbol to obtain useful data (ie, the original OFDM symbol to be transmitted by the transmitting end).

需要说明的是，上述操作仅是所述发送端和所述接收端在OFDM符号的传输过程中进行的部分操作示例，所述发送端和所述接收端进行的其他操作此处不再赘述。It should be noted that the foregoing operations are only a partial operation example performed by the transmitting end and the receiving end in the transmission process of the OFDM symbol, and other operations performed by the transmitting end and the receiving end are not described herein again.

本申请实施例提供的一种传输模式确定方法，适用于如图1所示的OFDM***。参阅图2所示，该方法的具体流程包括：A transmission mode determining method provided by an embodiment of the present application is applicable to an OFDM system as shown in FIG. 1. Referring to Figure 2, the specific process of the method includes:

步骤201、接收端针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的。Step 201: The receiving end combines each FFT length with each of the K CP lengths for each K length corresponding to each FFT length of the H FFT lengths to obtain an H*K combination mode. Wherein, H and K are positive integers, and each FFT length corresponds to K combination modes; one combination mode corresponds to a correlation value sequence, and the correlation value sequence is based on a preset CP fixed length and the combination mode The FFT length is calculated.

其中，所述接收端接收的每个OFDM符号的符号长度为FFT长度与CP长度的和，所述接收端接收到OFDM符号后，为了得到有用数据，需要先确定该OFDM符号的符号长度，即确定该OFDM符号在传输过程中具体的传输模式。而由于可能的FFT长度可能有H个，而每个FFT长度又可能对应K个CP长度，因此，所述接收端接收的OFDM符号的传输模式可能有H*K种可能，也就是所述接收端需要从这H*K种可能中确定准确的一种传输模式。所以，在步骤201中，所述接收端要分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式。The symbol length of each OFDM symbol received by the receiving end is the sum of the FFT length and the CP length. After the receiving end receives the OFDM symbol, in order to obtain useful data, the symbol length of the OFDM symbol needs to be determined first, that is, A specific transmission mode of the OFDM symbol during transmission is determined. The possible FFT length may have H, and each FFT length may correspond to K CP lengths. Therefore, the transmission mode of the OFDM symbol received by the receiving end may be There can be H*K kinds of possibilities, that is, the receiving end needs to determine an accurate transmission mode from the H*K kinds of possibilities. Therefore, in step 201, the receiving end combines each FFT length with each of the K CP lengths to obtain an H*K combination mode.

例如，当H个FFT长度为3个，具体为1024、2048、8192，每个FFT长度对应的K个CP长度为4个，具体为所述FFT长度的1/4、1/8、1/16、1/32时，所述接收端得到的所述H*K种组合模式为12种，分别为1024+256、1024+128、1024+64、1024+32、2048+512、2048+256、2048+128、2048+64、8192+2048、8192+1024、8192+512、8192+256。For example, when the length of the H FFTs is 3, specifically 1024, 2048, and 8192, the length of the K CPs corresponding to each FFT length is 4, specifically 1/4, 1/8, and 1/ of the FFT length. 16. At 1/32, the H*K combination mode obtained by the receiving end is 12 types, which are 1024+256, 1024+128, 1024+64, 1024+32, 2048+512, 2048+256. 2048+128, 2048+64, 8192+2048, 8192+1024, 8192+512, 8192+256.

由上述举例可以看出，每个FFT长度对应4种组合模式，也就是每个FFT长度对应K种组合模式。As can be seen from the above example, each FFT length corresponds to four combination modes, that is, each FFT length corresponds to K combination modes.

当然，除了上述举例外，所述H*K种组合模式还可以有多种，此处不再一一赘述。Of course, in addition to the above examples, there may be multiple types of H*K combination modes, and details are not described herein again.

在本申请实施例中，由于每种组合模式对应的相关值序列，是基于所述CP固定长度和所述组合模式中的FFT长度计算得到的，因此包含一个相同的FFT长度的K种组合模式对应的相关值序列相同。也就是说，所述H个FFT长度中每个FFT长度对应一个相关值序列，由所述FFT长度和所述FFT长度对应的K种CP长度组合成的K种组合模式，均对应所述FFT长度对应的相关值序列。因此，可选的，所述接收端可以先基于所述CP固定长度，计算接收的多个OFDM符号分别在所述H个FFT长度中每个FFT长度下的相关值序列，得到H个相关值序列。然后在所述接收端得到所述H*K种组合模式后，再分别将与每种组合模式中的FFT长度对应的相关值序列，与所述组合模式对应。这样，一种组合模式就与一个相关值序列对应。In the embodiment of the present application, since the correlation value sequence corresponding to each combination mode is calculated based on the fixed length of the CP and the FFT length in the combination mode, the K combination mode including the same FFT length is included. The corresponding sequence of correlation values is the same. That is, each FFT length of the H FFT lengths corresponds to a sequence of correlation values, and the K combination modes formed by combining the FFT length and the K kinds of CP lengths corresponding to the FFT length correspond to the FFT. A sequence of related values corresponding to the length. Therefore, optionally, the receiving end may first calculate, according to the fixed length of the CP, a sequence of correlation values of each of the received OFDM symbols in each of the H FFT lengths to obtain H correlation values. sequence. Then, after the H*K combination mode is obtained at the receiving end, the correlation value sequence corresponding to the FFT length in each combination mode is respectively associated with the combination mode. Thus, a combined mode corresponds to a sequence of related values.

例如，仍以FFT长度为1024、2048、8192三种，每个FFT长度对应的4个CP长度为所述FFT长度的1/4、1/8、1/16、1/32为例，12种组合模式分别对应的相关值序列可以如图3所示的组合模式、FFT长度以及相关值序列之间的对应关系所示。由图3可以直观地看出，1024、2048、8192三个FFT分别对应相关值序列1、相关值序列2、相关值序列3；为1024+256、1024+128、1024+64、1024+32的4组合模式均对应相关值序列1，为2048+512、2048+256、2048+128、2048+64的4种组合模式均对应相关值序列2，为8192+2048、8192+1024、8192+512、8192+256的4种组合模式均对应相关值序列3。For example, the length of the FFT is still 1024, 2048, and 8192. The length of the four CPs corresponding to each FFT length is 1/4, 1/8, 1/16, and 1/32 of the FFT length. The correlation value sequence corresponding to the combination mode may be as shown in the combination mode, the FFT length, and the correlation value sequence shown in FIG. It can be seen intuitively from FIG. 3 that the three FFTs of 1024, 2048, and 8192 respectively correspond to the correlation value sequence 1, the correlation value sequence 2, and the correlation value sequence 3; 1024+256, 1024+128, 1024+64, 1024+32 The 4 combination modes correspond to the correlation value sequence 1, and the four combination modes of 2048+512, 2048+256, 2048+128, and 2048+64 correspond to the correlation value sequence 2, which is 8192+2048, 8192+1024, and 8192+. The four combination modes of 512, 8192+256 correspond to the correlation value sequence 3.

可选的，所述接收端在所述CP固定长度和每种组合模式中的FFT长度计算得到所述组合模式对应的相关值序列，具体可以分为以下两种方法：Optionally, the receiving end calculates a sequence of correlation values corresponding to the combination mode in the fixed length of the CP and the FFT length in each combination mode, which may be specifically divided into the following two methods:

第一种方法：所述接收端可以通过执行以下四个步骤，得到每种组合模式对应的相关值序列：The first method: the receiving end can obtain the sequence of correlation values corresponding to each combination mode by performing the following four steps:

A1、所述接收端对多个OFDM符号进行FFT处理，得到FFT处理后的数据。A1. The receiving end performs FFT processing on a plurality of OFDM symbols to obtain FFT processed data.

A2、所述接收端将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行IFFT处理，得到N_seg段IFFT处理后的数据；其中，N_seg为2t，t为正整数。A2. The receiving end divides the FFT processed data into N _seg segments, and performs IFFT processing on each FFT processed data to obtain N _seg segment IFFT processed data; wherein N _seg is 2t, t is a positive integer.

A3、所述接收端根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列。A3. The receiving end calculates a correlation value sequence of each piece of IFFT processed data according to the CP fixed length, N _seg and the FFT length, and obtains a sequence of correlation values corresponding to the data after the N _seg segment IFFT processing. .

A4、所述接收端将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列。A4, the receiving end the data processing of the data segment N _seg IFFT IFFT processing each segment in the same data sampling point location, a correlation value corresponding to the data sequence after the IFFT processing section N _seg corresponding to each of the The correlation values are added to obtain the sequence of correlation values.

第二种方法：所述接收端可以但不限于采用以下公式一，得到每种组合模式对应的相关值序列x(n)： The second method: the receiving end can be, but is not limited to, adopting the following formula 1 to obtain a sequence of correlation values x(n) corresponding to each combination mode:

其中，y(n-i)为多个OFDM符号中数据采样点位置为(n-i)的数据；n表示所述多个OFDM符号中的任一数据采样点位置；i为相对于数据采样点位置n的偏移量；y^*(n-i-N_FFT)为所述多个OFDM符号中数据采样点位置为(n-i-N_FFT)的数据的共轭；N_FFT为该组合模式中的FFT长度，N_cont为所述CP固定长度。Where y(ni) is data of a data sample point position (ni) in a plurality of OFDM symbols; n represents a position of any one of the plurality of OFDM symbols; i is a position n relative to the data sample point An offset; y ^* (niN _FFT ) is a conjugate of data in the plurality of OFDM symbols with a data sample point position of (niN _FFT ); N _FFT is an FFT length in the combined mode, and N _cont is the CP Fixed length.

可选的，在上述第一种方法的步骤A1中，所述接收端对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据Y'，可以符合以下公式二：Optionally, in step A1 of the foregoing first method, the receiving end performs FFT processing on the multiple OFDM symbols to obtain FFT processed data Y′, which may meet the following formula 2:

Y'＝FFT(Y,L_FFT) 公式二Y'=FFT(Y,L _FFT ) Equation 2

其中，Y为所述多个OFDM符号，L_FFT为所述组合模式中的FFT长度。Where Y is the plurality of OFDM symbols and L _FFT is the FFT length in the combined mode.

一种可选的实现方式，在上述第一种方法的步骤A2中，所述接收端将所述FFT处理后的数据均分成N_seg段，也可以叫做分成N_seg个子带。所述接收端对每段FFT处理后的数据进行IFFT处理，得到该段IFFT处理后的数据y_l，可以符合以下公式三：In an optional implementation manner, in step A2 of the foregoing first method, the receiving end divides the FFT processed data into N _seg segments, which may also be referred to as N _seg subbands. The receiving end performs IFFT processing on each piece of FFT processed data to obtain the data y _l processed by the IFFT, which can meet the following formula 3:

其中，y_l为第l段IFFT处理后的数据，idx为Y'的索引，

一种可选的实现方式，在上述第一种方法的步骤A3中，所述接收端计算每段IFFT处理后的数据的相关值序列z_l(p)，可以符合以下公式四：In an optional implementation manner, in step A3 of the foregoing first method, the receiving end calculates a sequence z ₁ (p) of correlation values of each piece of IFFT processed data, which may meet the following formula 4:

为第l段IFFT处理后的数据中数据采样点位置为

Conjugation of the data; L _cont is the fixed length of the CP.

一种可选的实现方式，在上述第一种方法的步骤A4中，得到的所述组合模式对应的所述相关值序列z(p)，可以符合以下公式五：An optional implementation manner, in step A4 of the foregoing first method, the obtained correlation value sequence z(p) corresponding to the combined mode may meet the following formula five:

需要说明的是，在上述第一种方法和上述第二种方法中的所述CP固定长度、所述组合模式中的所述FFT长度相同，本申请实施例仅为了区分上述两种方法，采用了不同的表示方法，即第一种方法与第二种方法中分别用L_cont、N_cont表示所述CP固定长度，以及分别用L_FFT、N_FFT表示所述FFT长度。可选的，两种方法均可以用相同的表示方法表示所述 CP固定长度，例如均用L_cont表示，或者均用N_cont表示；以及均可以用相同的表示方法表示所述FFT长度，例如均用L_FFT表示，或者均用N_FFT表示。It should be noted that, in the above-mentioned first method and the foregoing second method, the CP fixed length and the FFT length in the combined mode are the same, and the embodiment of the present application only distinguishes the above two methods, and adopts Different representation methods are used, that is, the first method and the second method respectively represent the fixed length of the CP by L _cont and N _cont , and the FFT length is represented by L _FFT and N _FFT , respectively. Optionally, both methods may represent the fixed length of the CP by the same representation method, for example, all represented by L _cont , or both denoted by N _cont ; and the same representation method may be used to represent the FFT length, for example Both are represented by L _FFT or both are represented by N _FFT .

由上述对两种方法的具体描述可知，第一种方法是进行了时域-频域-时域转换后，再得到相关值序列，第二种方法是直接基于时域得到相关值序列。虽然相对于第二种方法，第一种方法需要利用FFT/IFFT的资源去进行时域-频域-时域转换，但是由于OFDM***中本身具有FFT/IFFT的资源，因此第一种方法实现同样比较容易。It can be seen from the above specific description of the two methods that the first method is to perform the time domain-frequency domain-time domain conversion, and then obtain the correlation value sequence, and the second method is to obtain the correlation value sequence directly based on the time domain. Although the first method requires FFT/IFFT resources for time domain-frequency domain-time domain conversion with respect to the second method, since the OFDM system itself has FFT/IFFT resources, the first method is implemented. It's also easier.

具体的，由于第一种方法进行了分段处理，每段数据相当于把多个OFDM符号(即相对于第二种方法)均缩短了N_seg倍，因此，第一种方法计算每段的相关值序列时，计算的固定相关长度相对于第二种方法也缩短了N_seg倍(即

)。这样，第一种方法得到的相关值序列包含的相关值的个数，是第二种方法得到的相应的相关值序列包含的相关值的个数的

Specifically, since the first method performs segmentation processing, each piece of data is equivalent to shortening N _seg times of multiple OFDM symbols (that is, relative to the second method). Therefore, the first method calculates each segment. When the sequence of correlation values is used, the calculated fixed correlation length is also shortened by N _seg times relative to the second method (ie

). Thus, the number of correlation values included in the correlation value sequence obtained by the first method is the number of correlation values included in the corresponding correlation value sequence obtained by the second method.

例如，所述10个OFDM符号中每个OFDM符号包含100个数据采样点，共包含1000个数据采样点，其中，假设所述固定CP长度为40，FFT长度为60。For example, each of the 10 OFDM symbols includes 100 data sampling points, and includes a total of 1000 data sampling points, wherein the fixed CP length is 40 and the FFT length is 60.

若所述接收端采用第二种方法计算所述10个OFDM符号在所述FFT长度下的相关值序列时，直接将40作为固定相关长度，得到的最终的相关值序列中包含1000个相关值，即x(1)、x(2)、……、x(1000)。If the receiving end calculates the sequence of correlation values of the 10 OFDM symbols at the FFT length by using the second method, directly using 40 as the fixed correlation length, and the final correlation value sequence obtained includes 1000 correlation values. , ie x(1), x(2), ..., x(1000).

若所述接收端采用第一种方法计算所述10个OFDM符号在所述FFT下的相关值序列时，假设所述接收端将所述10个OFDM符号分成10段，则每段包含100个数据采样点，且每段中的10个OFDM符号中每个OFDM符号包含10个数据采样点。此时，所述接收端在计算每段的相关值序列时，用于计算的固定相关长度变为40/10＝4，得到的每段的相关值序列中包含100个相关值。将10段分别对应的相关值序列中的相关值对应相加后，得到的最终的相关值序列中包含100个相关值，即z(1)、z(2)、……、z(100)。If the receiving end calculates the sequence of correlation values of the 10 OFDM symbols under the FFT by using the first method, if the receiving end divides the 10 OFDM symbols into 10 segments, each segment includes 100 Data sample points, and each of the 10 OFDM symbols in each segment contains 10 data sample points. At this time, when the receiving end calculates the correlation value sequence of each segment, the fixed correlation length used for the calculation becomes 40/10=4, and the obtained correlation value sequence of each segment includes 100 correlation values. After the correlation values in the sequence of correlation values corresponding to the 10 segments are added, the final correlation value sequence contains 100 correlation values, namely z(1), z(2), ..., z(100). .

步骤202、所述接收端针对每种组合模式，将接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；其中，所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列。Step 202: The receiving end accumulates, for each combination mode, a correlation value of the same data sample point position in each OFDM symbol in the received multiple OFDM symbols to obtain one accumulated value sequence; wherein the multiple OFDM symbols The same data position within each OFDM symbol is determined based on the CP length and FFT length in the combined mode; the H*K combination mode corresponds to H*K accumulated value sequences.

其中，所述多个OFDM符号可以为所述接收端接收的全部信号，也可以为所述接收端接收的全部信号中的部分信号。The plurality of OFDM symbols may be all signals received by the receiving end, or may be part of all signals received by the receiving end.

所述接收端在执行步骤202时，所述接收端针对每个OFDM符号包含的多个数据采样点，在每种组合模式对应的相关值序列中，分别确定每个OFDM符号中相同数据采样点位置的相关值，并将相同数据采样点位置的相关值累加，得到累加值序列。其中，每种组合模式对应一个累加值序列。When the receiving end performs step 202, the receiving end determines the same data sampling point in each OFDM symbol in each of the combined value sequences corresponding to each combined mode for each of the plurality of data sampling points included in each OFDM symbol. The correlation value of the position and the correlation value of the same data sampling point position are accumulated to obtain a sequence of accumulated values. Wherein each combination mode corresponds to a sequence of accumulated values.

具体的，针对步骤201中采用的两种不同的方法得到的每种组合模式的相关值序列，所述接收端分别对应上述两种方法可以分别采用以下两种累加方式：Specifically, for the sequence of correlation values of each combination mode obtained by the two different methods used in step 201, the receiving end respectively adopts the following two accumulation methods corresponding to the foregoing two methods:

方式一：对应上述第一种方法，每种组合传输模式对应的累加值序列z_avg(r)，可以符合以下公式六： Manner 1: Corresponding to the first method described above, the accumulated value sequence z_avg(r) corresponding to each combined transmission mode may conform to the following formula 6:

方式二：对应上述第二种方法，每种组合传输模式对应的累加值序列x_avg(j)，可以符合以下公式：Manner 2: Corresponding to the second method described above, the accumulated value sequence x_avg(j) corresponding to each combined transmission mode may conform to the following formula:

其中，所述接收端基于所述组合模式中的CP长度和FFT长度确定所述多个OFDM符号内每个OFDM符号的相同数据位置时，实际上是基于所述组合模式中的CP长度和FFT长度确定两两OFDM符号相同数据采样点位置之间的相隔长度，进而确定该相隔长度的整数倍的数据采样点位置为所述多个OFDM符号内每个OFDM符号的相同数据位置。因此，可以理解为在将所述多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加时，实际上是将相隔长度的整数倍的相应数据采样点位置的相关值累加。Wherein, when the receiving end determines the same data position of each OFDM symbol in the multiple OFDM symbols based on the CP length and the FFT length in the combined mode, it is actually based on the CP length and the FFT in the combined mode. The length determines the length of the separation between the positions of the same data sample points of the two OFDM symbols, and further determines the data sample point position of the integer multiple of the separated length as the same data position of each OFDM symbol in the plurality of OFDM symbols. Therefore, it can be understood that when the correlation values of the same data sample point positions in each OFDM symbol in the plurality of OFDM symbols are accumulated, the correlation values of the respective data sample point positions which are integer multiples of the length are actually accumulated.

具体的，由上述两种方式具体实现方式可知，在同一种组合模式中，两种方式中的相隔长度不同，在上述第一种方式中，所述接收端要先用所述组合模式下的CP长度和FFT长度的和除以分段数得到商值，所述商值为确定的所述相隔长度；在上述第二种方式中，所述接收端直接将所述组合模式下的CP长度和FFT长度的和，确定为所述相隔长度。Specifically, the specific implementation manners of the foregoing two methods show that, in the same combination mode, the lengths of the two modes are different. In the foregoing first mode, the receiving end first uses the combined mode. The sum of the CP length and the FFT length is divided by the number of segments to obtain a quotient value, and the quotient is the determined interval length; in the second mode, the receiving end directly compares the CP length in the combined mode The sum of the FFT lengths is determined as the length of the separation.

下面，仅以上述第二种方式为例，对累加过程进行说明：In the following, the second process is taken as an example to describe the accumulation process:

例如，假设10个OFDM符号共包含1000个数据采样点，当组合模式为CP长度40和FFT长度60的组合，所述组合模式对应的相关值序列为x(1)、x(2)、……、x(1000)时，所述接收端得到的一个累加值序列为：For example, suppose 10 OFDM symbols comprise a total of 1000 data sampling points. When the combined mode is a combination of CP length 40 and FFT length 60, the sequence of correlation values corresponding to the combined mode is x(1), x(2), ... ..., x (1000), a sequence of accumulated values obtained by the receiving end is:

x_avg(1)：x(1)+x(101)+……+x(801)+x(901)、X_avg(1): x(1)+x(101)+...+x(801)+x(901),

x_avg(2)：x(2)+x(102)+……+x(802)+x(902)、X_avg(2): x(2)+x(102)+...+x(802)+x(902),

x_avg(3)：x(3)+x(103)+……+x(803)+x(903)、X_avg(3): x(3)+x(103)+...+x(803)+x(903),

. ： …………、. :............,

x_avg(98)：x(98)+x(198)+……+x(898)+x(998)、X_avg(98): x(98)+x(198)+......+x(898)+x(998),

x_avg(99)：x(99)+x(199)+……+x(899)+x(999)、X_avg(99): x(99)+x(199)+......+x(899)+x(999),

x_avg(100)：x(100)+x(200)+……+x(900)+x(1000)。X_avg(100): x(100)+x(200)+...+x(900)+x(1000).

又例如，假设5个OFDM符号共包含1000个数据采样点，当组合模式为CP长度40和FFT长度160的组合，所述组合模式对应的相关值序列为x(1)、x(2)、……、x(1000)时，所述接收端得到的一个累加值序列为： For another example, it is assumed that 5 OFDM symbols comprise a total of 1000 data sampling points, and when the combined mode is a combination of a CP length 40 and an FFT length 160, the combined value sequence corresponding to the combined mode is x(1), x(2), ......, x (1000), a sequence of accumulated values obtained by the receiving end is:

x_avg(1)：x(1)+x(201)+x(401)+x(601)+x(801)、X_avg(1): x(1)+x(201)+x(401)+x(601)+x(801),

x_avg(2)：x(2)+x(202)+x(402)+x(602)+x(802)、X_avg(2): x(2)+x(202)+x(402)+x(602)+x(802),

x_avg(3)：x(3)+x(203)+x(402)+x(603)+x(803)、X_avg(3): x(3)+x(203)+x(402)+x(603)+x(803),

. ： …………、. :............,

x_avg(198)：x(198)+x(398)+x(598)+x(798)+x(998)、X_avg(198): x(198)+x(398)+x(598)+x(798)+x(998),

x_avg(199)：x(199)+x(399)+x(599)+x(799)+x(999)、X_avg(199): x(199)+x(399)+x(599)+x(799)+x(999),

x_avg(200)：x(200)+x(400)+x(600)+x(800)+x(1000)。X_avg(200): x(200)+x(400)+x(600)+x(800)+x(1000).

步骤203、所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。Step 203: The receiving end uses, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest.

所述接收端在执行步骤203之前，可以先将所述H*K个累加值序列中的每个累加值序列包含的多个累加值处理成绝对值。这样，所述接收端可以快速准确地找到绝对值最大的一个累加值，进而准确地找到绝对值最大的该累加值所在的累加值序列。The receiving end may first process the plurality of accumulated values included in each of the H*K accumulated value sequences into absolute values before performing step 203. In this way, the receiving end can quickly and accurately find an accumulated value with the largest absolute value, thereby accurately finding the accumulated value sequence in which the accumulated value having the largest absolute value is located.

所述接收端在执行步骤203之后，所述接收端还可以进而执行以下两个步骤：After the receiving end performs step 203, the receiving end may further perform the following two steps:

B1、所述接收端基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围。其中，所述设定阈值可以为最大的绝对值的50％或60％等比例，还可以根据实际情况具体取值。B1. The receiving end determines, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data sampling point position range in which the absolute value of the accumulated value is greater than a set threshold and the accumulated value is the largest accumulated value. . The set threshold may be a ratio of 50% or 60% of the maximum absolute value, and may also be specifically determined according to actual conditions.

B2、所述接收端以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。B2. The receiving end synchronizes the multiple OFDM symbols with reference to an intermediate data sampling point position in the data sampling point location range.

在上述步骤B1中，所述接收端可以通过以下方法确定所述数据采样点位置范围：In the above step B1, the receiving end may determine the location range of the data sampling point by the following method:

所述接收端将绝对值最大的一个累加值所在的累加值序列中包括的多个累加值的绝对值，绘制到以OFDM符号中的数据采样点位置为横坐标、以累加值的绝对值为纵坐标的坐标系中，生成波形图；The receiving end draws the absolute value of the plurality of accumulated values included in the accumulated value sequence in which the accumulated value of the largest absolute value is located to the abscissa of the data sampling point position in the OFDM symbol, and the absolute value of the accumulated value In the coordinate system of the ordinate, a waveform diagram is generated;

所述接收端在所述波形图中确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的目标区间，并确定所述目标区间映射到所述横坐标中对应的所述数据采样点位置范围。The receiving end determines, in the waveform diagram, a target interval that the absolute value of the accumulated value is greater than a set threshold and includes an accumulated value that is the largest absolute value, and determines that the target interval is mapped to the corresponding one of the abscissas The data sampling point location range.

例如，生成的所述波形图如图4所示，最大的绝对值为0.81，所述设定阈值为0.52，所述目标区间为[0.52，0.81]，所述目标区间映射到所述横坐标中对应的所述数据采样点位置范围为[100，510]，这样所述接收端可以确定所述中间数据采样点位置为305。For example, the generated waveform diagram is as shown in FIG. 4, the maximum absolute value is 0.81, the set threshold is 0.52, the target interval is [0.52, 0.81], and the target interval is mapped to the abscissa. The corresponding data sampling point position range is [100, 510], so that the receiving end can determine that the intermediate data sampling point position is 305.

除上述生成波形图的方法确定所述数据采样点位置范围外，所述接收端还可以采用如下方法：In addition to the method for generating a waveform map to determine the location range of the data sampling point, the receiving end may also adopt the following method:

当然，所述接收端确定所述数据采样点位置范围的方法还可以有其他多种，此处不再一一列举。Of course, the method for determining the location range of the data sampling point by the receiving end may also have other types, and is no longer here. List one by one.

采用本申请实施例提供的传输模式确定方法，接收端针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；所述接收端针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列，进而得到所述H*K种组合模式对应的H*K个累加值序列；最后，所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。在该方法中，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此该方法可以满足接收端快速准确地确定传输模式的需求。With the transmission mode determining method provided by the embodiment of the present application, the receiving end combines each FFT length with each of the K CP lengths for each of the K CP lengths corresponding to each FFT length of the H FFT lengths. Obtaining an H*K combination mode; wherein the combination mode corresponds to a correlation value sequence, and the correlation value sequence is calculated based on a preset CP fixed length and an FFT length in the combination mode; The receiving end accumulates correlation values of the same data sampling point positions in each OFDM symbol in each OFDM symbol for each combination mode to obtain one accumulated value sequence, thereby obtaining H*K corresponding to the H*K combination mode. And a sequence of accumulated values corresponding to the accumulated value sequence in which the absolute value of the H*K accumulated value sequences is the largest, and the combined mode corresponding to the accumulated value sequence in which the absolute value is the largest. In the method, the receiving end only needs to perform addition calculation based on the correlation value sequence, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, so the The method can meet the requirement of the receiving end to quickly and accurately determine the transmission mode.

基于以上实施例，接收端在基于预设的CP固定长度和每种组合模式中的FFT长度计算计算所述组合模式对应的相关值序列时，可以不计算多个OFDM符号中连续的每个数据采样点位置的相关值，而是计算相隔固定数据采样点间隔的数据采样点位置的相关值。例如，固定数据采样点间隔可以为64(也可以为其他，本申请实施例不做限定)，所述接收端可以计算得到相关值序列x(n),(n＝1,65,129,....)。这样，在计算相关值序列的过程中，可以节省计算相关值的次数，可以降低计算复杂度。Based on the above embodiment, when the receiving end calculates the correlation value sequence corresponding to the combined mode based on the preset CP fixed length and the FFT length in each combined mode, each of the plurality of OFDM symbols may not be calculated. The correlation value of the sampling point position is calculated, and the correlation value of the data sampling point position separated by the fixed data sampling point interval is calculated. For example, the fixed data sampling point interval may be 64 (may also be other, which is not limited in the embodiment of the present application), and the receiving end may calculate the correlation value sequence x(n), (n=1, 65, 129, ... .). In this way, in the process of calculating the sequence of correlation values, the number of times the correlation value is calculated can be saved, and the computational complexity can be reduced.

基于以上实施例，所述接收端在确定了传输模式后，可以基于所述传输模式中的CP长度和FFT长度计算所述传输模式对应的相关值序列，并针对所述传输，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；然后所述接收端在得到的所述累加值序列中，确定累加值的绝对值大于设定阈值、且包含绝对值最大的累加值的数据采样点位置范围，进而以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。Based on the above embodiment, after determining the transmission mode, the receiving end may calculate a correlation value sequence corresponding to the transmission mode based on a CP length and an FFT length in the transmission mode, and perform multiple OFDM for the transmission. The correlation value of the same data sample point position in each OFDM symbol in the symbol is accumulated to obtain one accumulated value sequence; then the receiving end determines, in the obtained accumulated value sequence, that the absolute value of the accumulated value is greater than a set threshold, and And a data sample point position range including an accumulated value having the largest absolute value, and then synchronizing the plurality of OFDM symbols with reference to an intermediate data sample point position in the data sample point position range.

基于以上实施例，本申请实施例还提供了一种接收端，该接收端应用于如图1所示的OFDM***，用于实现如图2所示的传输模式确定方法。参阅图5所示，该接收端备500包括：处理单元501和确定单元502，其中：Based on the above embodiment, the embodiment of the present application further provides a receiving end, which is applied to the OFDM system shown in FIG. 1 for implementing the transmission mode determining method shown in FIG. 2. Referring to FIG. 5, the receiving terminal 500 includes: a processing unit 501 and a determining unit 502, where:

所述处理单元501，用于针对H个快速傅立叶变换FFT长度中每个FFT长度对应的K个循环前缀CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；以及The processing unit 501 is configured to combine each FFT length with each of the K CP lengths for each of the K cyclic prefix CP lengths corresponding to each FFT length of the H fast Fourier transform FFT lengths. Obtaining H*K combination mode; wherein H and K are positive integers, each FFT length corresponding to K combination modes; one combination mode corresponds to a correlation value sequence, and the correlation value sequence is based on a preset CP Calculated by the fixed length and the FFT length in the combined mode;

针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；其中，所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列；For each combination mode, accumulating correlation values of the same data sample point positions in each OFDM symbol within a plurality of OFDM symbols to obtain one accumulated value sequence; wherein, the same data position of each OFDM symbol in the plurality of OFDM symbols Is determined based on a CP length and an FFT length in the combined mode; the H*K combination mode corresponds to a H*K accumulated value sequence;

所述确定单元502，用于将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。The determining unit 502 is configured to use, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest.

可选的，所述处理单元501，在基于所述CP固定长度和所述组合模式中的FFT长度计算得到所述相关值序列时，具体用于：Optionally, the processing unit 501 is configured to: when calculating, according to the FFT length of the CP fixed length and the combined mode, the correlation value sequence:

对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据；将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行快速傅立叶逆变换IFFT处理，得到N_seg段IFFT处理后的数据；其中，N_seg为2t，t为正整数；根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列；将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列。Performing FFT processing on the plurality of OFDM symbols to obtain FFT processed data; dividing the FFT processed data into N _seg segments, and performing inverse fast Fourier transform IFFT processing on each FFT processed data to obtain N _seg segment IFFT processed data; wherein N _seg is 2t, t is a positive integer; according to the CP fixed length, N _seg and the FFT length, respectively, the correlation value sequence of each piece of IFFT processed data is calculated, sequence to obtain a correlation value N _seg IFFT processed data segment corresponding to each; the data after the data processing section N _seg IFFT IFFT processing each segment in the same data sampling point position, after the IFFT processing section N _seg The corresponding correlation values in the sequence of correlation values corresponding to the data are added to obtain the sequence of correlation values.

每种组合模式对应的相关值序列x(n)，可以符合以下公式：The correlation value sequence x(n) corresponding to each combination mode can conform to the following formula:

其中，y(n-i)为所述多个OFDM符号中数据采样点位置为(n-i)的数据；n表示所述多个OFDM符号中的任一数据采样点位置；i为相对于数据采样点位置n的偏移量；y^*(n-i-N_FFT)为所述多个OFDM符号中数据采样点位置为(n-i-N_FFT)的数据的共轭；N_FFT为该组合模式中的FFT长度，N_cont为所述CP固定长度。Where y(ni) is data of a data sample point position (ni) in the plurality of OFDM symbols; n represents a position of any one of the plurality of OFDM symbols; i is a position relative to a data sampling point The offset of n; y ^* (niN _FFT ) is the conjugate of the data sample point position in the plurality of OFDM symbols (niN _FFT ); N _FFT is the FFT length in the combined mode, and N _cont is Said CP fixed length.

每种组合传输模式对应的累加值序列x_avg(j)，可以符合以下公式：The accumulated value sequence x_avg(j) corresponding to each combined transmission mode can conform to the following formula:

可选的，所述处理单元501计算每段IFFT处理后的数据的相关值序列z_l(p)，可以符合以下公式：Optionally, the processing unit 501 calculates a sequence z ₁ (p) of correlation values of the data after each IFFT processing, and may conform to the following formula:

为第l段IFFT处理后的数据中数据采样点位置为

的数据的共轭；L_FFT为所述FFT长度，L_cont为所述CP固定长度；Where y _l (pq) is the data of the data sampling point position (pq) in the data of the 1st segment of the IFFT processing; p represents the position of any data sampling point in the data of the 1st segment of the IFFT processing; q is the relative The offset of the data sample point position p;

Conjugation of data; L _FFT is the FFT length, L _cont is the fixed length of the CP;

所述组合模式对应的相关值序列z(p)，可以符合以下公式：The correlation value sequence z(p) corresponding to the combined mode may conform to the following formula:

每种组合传输模式对应的累加值序列z_avg(r)，可以符合以下公式：The accumulated value sequence z_avg(r) corresponding to each combined transmission mode can conform to the following formula:

所述处理单元501，还可以用于基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围；以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。The processing unit 501 is further configured to determine, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data that the absolute value of the accumulated value is greater than a set threshold and includes an accumulated value that is the largest absolute value. a sampling point position range; synchronizing the plurality of OFDM symbols with reference to an intermediate data sampling point position in the data sampling point position range.

采用本申请实施例提供的接收端，针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；所述接收端针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列，进而得到所述H*K种组合模式对应的H*K个累加值序列；最后，所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。这样，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此可以满足接收端快速准确地确定传输模式的需求。With the receiving end provided by the embodiment of the present application, for each K lengths corresponding to each FFT length of the H FFT lengths, each FFT length is combined with each CP length of the K CP lengths to obtain H*. K combination mode; wherein a combination mode corresponds to a correlation value sequence, and the correlation value sequence is calculated based on a preset CP fixed length and an FFT length in the combination mode; the receiving end is for each And combining the correlation values of the same data sampling point positions in each OFDM symbol in the plurality of OFDM symbols to obtain one accumulated value sequence, thereby obtaining H*K accumulated value sequences corresponding to the H*K combined mode Finally, the receiving end uses, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest. In this way, the receiving end only needs to perform addition calculation based on the sequence of correlation values, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, and thus the receiving end can be satisfied. Quickly and accurately determine the need for a transmission mode.

需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。在本申请的实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. The functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

基于以上实施例，本申请实施例还提供了一种接收端，所述接收端应用于如图1所示的OFDM***，用于实现如图2所示的传输模式确定方法。参阅图6所示，所述接收端600包括：收发器601、处理器602和存储器604，其中：Based on the above embodiment, the embodiment of the present application further provides a receiving end, and the receiving end is applied to an OFDM system as shown in FIG. 1 for implementing a transmission mode determining method as shown in FIG. 2. Referring to FIG. 6, the receiving end 600 includes a transceiver 601, a processor 602, and a memory 604, where:

所述收发器601、所述处理器602和所述存储器604相互连接。可选的，所述收发器601、所述处理器602和所述存储器604可以通过图6中所示的总线603相互连接；所述总线603可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图6中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。The transceiver 601, the processor 602, and the memory 604 are connected to each other. Optionally, the transceiver 601, the processor 602, and the memory 604 may be connected to each other through a bus 603 shown in FIG. 6; the bus 603 may be a peripheral component interconnect (peripheral component interconnect, PCI) bus or extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 6, but it does not mean that there is only one bus or one type of bus.

所述接收端600在实现如图2所示的传输模式确定方法时：The receiving end 600 implements the transmission mode determining method as shown in FIG. 2:

所述收发器601，用于接收数据，所述数据包括多个OFDM符号； The transceiver 601 is configured to receive data, where the data includes multiple OFDM symbols;

所述处理器602，用于针对H个快速傅立叶变换FFT长度中每个FFT长度对应的K个循环前缀CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；The processor 602 is configured to combine each FFT length with each of the K CP lengths for each of the K cyclic prefix CP lengths corresponding to each FFT length of the H fast Fourier transform FFT lengths. Obtaining H*K combination mode; wherein H and K are positive integers, each FFT length corresponding to K combination modes; one combination mode corresponds to a correlation value sequence, and the correlation value sequence is based on a preset CP Calculated by the fixed length and the FFT length in the combined mode;

针对每种组合模式，将所述收发器601接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；其中，所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列；For each combination mode, accumulating correlation values of the same data sample point positions in each OFDM symbol in the plurality of OFDM symbols received by the transceiver 601 to obtain one accumulated value sequence; wherein each of the plurality of OFDM symbols The same data position of the OFDM symbols is determined based on the CP length and the FFT length in the combined mode; the H*K combination mode corresponds to H*K accumulated value sequences;

将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。A combination mode corresponding to the accumulated value sequence in which one of the H*K accumulated value sequences has the largest absolute value is used as the transmission mode.

可选的，所述处理器602，在基于所述CP固定长度和所述组合模式中的FFT长度计算得到所述相关值序列时，具体用于：Optionally, the processor 602 is configured to: when calculating, according to the FFT length of the CP fixed length and the combined mode, the correlation value sequence:

对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据；Performing FFT processing on the plurality of OFDM symbols to obtain FFT processed data;

将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行快速傅立叶逆变换IFFT处理，得到N_seg段IFFT处理后的数据；其中，N_seg为2^t，t为正整数；The FFT processed data is divided into N _seg segments, and each FFT processed data is subjected to fast inverse Fourier transform IFFT processing to obtain N _seg segment IFFT processed data; wherein N _seg is 2 ^t , t Is a positive integer;

根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列；Calculating, according to the fixed length of the CP, the N _seg and the FFT length, a sequence of correlation values of the data after each IFFT processing, and obtaining a sequence of correlation values corresponding to the data processed by the N _seg segment IFFT;

将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列。And adding, in the N _seg segment IFFT processed data, the same data sampling point position in each IFFT processed data, and adding corresponding correlation values in the correlation value sequence corresponding to the N _seg segment IFFT processed data respectively, to obtain The sequence of correlation values.

可选的，每种组合模式对应的相关值序列x(n)，符合以下公式：Optionally, the sequence of correlation values x(n) corresponding to each combination mode conforms to the following formula:

可选的，每种组合传输模式对应的累加值序列x_avg(j)，符合以下公式：Optionally, the accumulated value sequence x_avg(j) corresponding to each combined transmission mode conforms to the following formula:

可选的，所述处理器602计算每段IFFT处理后的数据的相关值序列z_l(p)，符合以下公式： Optionally, the processor 602 calculates a sequence z ₁ (p) of correlation values of each piece of IFFT processed data, and conforms to the following formula:

为第l段IFFT处理后的数据中数据采样点位置为

所述组合模式对应的相关值序列z(p)，符合以下公式：The correlation value sequence z(p) corresponding to the combined mode conforms to the following formula:

可选的，每种组合传输模式对应的累加值序列z_avg(r)，符合以下公式：Optionally, the accumulated value sequence z_avg(r) corresponding to each combined transmission mode conforms to the following formula:

可选的，所述处理器602，还用于：Optionally, the processor 602 is further configured to:

基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围；Determining, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data sampling point position range in which the absolute value of the accumulated value is greater than a set threshold and including an accumulated value of the absolute maximum value;

以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。The plurality of OFDM symbols are synchronized based on an intermediate data sample point position in the data sample point location range.

所述存储器604，用于存放程序等。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。所述存储器604可能包括RAM，也可能还包括非易失性存储器，例如至少一个磁盘存储器。所述处理器602执行所述存储器604所存放的应用程序，实现上述功能，从而实现如图2所示的传输模式确定方法。The memory 604 is configured to store a program or the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 604 may include RAM and may also include non-volatile memory, such as at least one disk storage. The processor 602 executes an application stored in the memory 604 to implement the above functions, thereby implementing a transmission mode determining method as shown in FIG. 2.

采用本申请实施例提供的接收端，针对H个FFT长度中每个FFT长度对应的K个CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；所述接收端针对每种组合模式，将多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列，进而得到所述H*K种组合模式对应的H*K个累加值序列；最后，所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。这样，接收端只需基于相关值序列进行加法计算，计算量小，计算复杂度低；并且将相应的相关值累加后，会凸显峰值，使接收端可以准确确定传输模式，因此可以满足接收端快速准确地确定传输模式的需求。 With the receiving end provided by the embodiment of the present application, for each K lengths corresponding to each FFT length of the H FFT lengths, each FFT length is combined with each CP length of the K CP lengths to obtain H*. K combination mode; wherein a combination mode corresponds to a correlation value sequence, and the correlation value sequence is calculated based on a preset CP fixed length and an FFT length in the combination mode; the receiving end is for each And combining the correlation values of the same data sampling point positions in each OFDM symbol in the plurality of OFDM symbols to obtain one accumulated value sequence, thereby obtaining H*K accumulated value sequences corresponding to the H*K combined mode Finally, the receiving end uses, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest. In this way, the receiving end only needs to perform addition calculation based on the sequence of correlation values, the calculation amount is small, and the calculation complexity is low; and after the corresponding correlation values are accumulated, the peak value is highlighted, so that the receiving end can accurately determine the transmission mode, and thus the receiving end can be satisfied. Quickly and accurately determine the need for a transmission mode.

本领域内的技术人员应明白，本申请的实施例可提供为方法、***、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

本申请是参照根据本申请实施例的方法、设备(***)、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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

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。The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

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 such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

显然，本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的精神和范围。这样，倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。 It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims

一种传输模式确定方法，应用于正交频分复用OFDM***，其特征在于，包括：A transmission mode determining method is applied to an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system, and includes:

接收端针对H个快速傅立叶变换FFT长度中每个FFT长度对应的K个循环前缀CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；The receiving end combines each FFT length with each of the K CP lengths to obtain an H*K combination for each of the K cyclic prefix CP lengths corresponding to each FFT length of the H fast Fourier transform FFT lengths. a mode; wherein H and K are positive integers, each FFT length corresponds to K combination modes; one combination mode corresponds to a correlation value sequence, and the correlation value sequence is based on a preset CP fixed length and the combination The FFT length in the mode is calculated;

所述接收端针对每种组合模式，将接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；其中，所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列；And the receiving end accumulates, for each combined mode, a correlation value of the same data sampling point position in each OFDM symbol in the received multiple OFDM symbols to obtain one accumulated value sequence; wherein each of the multiple OFDM symbols The same data position of the OFDM symbol is determined based on the CP length and the FFT length in the combined mode; the H*K combination mode corresponds to H*K accumulated value sequences;

所述接收端将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。The receiving end uses, as the transmission mode, a combined mode corresponding to the accumulated value sequence in which the accumulated value of the H*K accumulated value sequence is the largest.
如权利要求1所述的方法，其特征在于，所述接收端基于所述CP固定长度和所述组合模式中的FFT长度计算得到所述相关值序列，包括：The method according to claim 1, wherein the receiving end calculates the sequence of correlation values based on the fixed length of the CP and the FFT length in the combined mode, including:

所述接收端对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据；The receiving end performs FFT processing on the plurality of OFDM symbols to obtain FFT processed data;

所述接收端将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行快速傅立叶逆变换IFFT处理，得到N_seg段IFFT处理后的数据；其中，N_seg为2t，t为正整数；The receiving end divides the FFT processed data into N _seg segments, and performs inverse fast Fourier transform IFFT processing on each FFT processed data to obtain N _seg segment IFFT processed data; wherein, N _seg is 2t, t is a positive integer;

所述接收端根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列；The receiving end calculates a correlation value sequence of each piece of IFFT processed data according to the CP fixed length, N _seg and the FFT length, and obtains a sequence of correlation values corresponding to the data after the N _seg segment IFFT processing;

所述接收端将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列。Correlation value corresponding to the value of the sequence data processing of the data segment N _seg IFFT IFFT processing each segment in the same sampling point position data, the data after IFFT processing section N _seg corresponding to each of the receiving terminal Adding together, the sequence of correlation values is obtained.
如权利要求1所述的方法，其特征在于，每种组合模式对应的相关值序列x(n)，符合以下公式：The method according to claim 1, wherein the sequence of correlation values x(n) corresponding to each combination mode conforms to the following formula:

其中，y(n-i)为所述多个OFDM符号中数据采样点位置为(n-i)的数据；n表示所述多个OFDM符号中的任一数据采样点位置；i为相对于数据采样点位置n的偏移量；y^*(n-i-N_FFT)为所述多个OFDM符号中数据采样点位置为(n-i-N_FFT)的数据的共轭；N_FFT为该组合模式中的FFT长度，N_cont为所述CP固定长度。Where y(ni) is data of a data sample point position (ni) in the plurality of OFDM symbols; n represents a position of any one of the plurality of OFDM symbols; i is a position relative to a data sampling point The offset of n; y ^* (niN _FFT ) is the conjugate of the data sample point position in the plurality of OFDM symbols (niN _FFT ); N _FFT is the FFT length in the combined mode, and N _cont is Said CP fixed length.
如权利要求3所述的方法，其特征在于，每种组合传输模式对应的累加值序列x_avg(j)，符合以下公式：The method according to claim 3, characterized in that the accumulated value sequence x_avg(j) corresponding to each combined transmission mode conforms to the following formula:

其中，j为累加值序列的索引值，1≤j≤(N_FFT+N_CP)；N_CP为该组合模式中的CP长度；x(j+m×(N_FFT+N_CP))为所述多个OFDM符号中数据采样点位置为(j+m×(N_FFT+N_CP))的相关值；Q为所述多个OFDM符号的总个数。Where j is the index value of the accumulated value sequence, 1 ≤ j ≤ (N _FFT + N _CP ); N _CP is the CP length in the combined mode; x (j + m × (N _FFT + N _CP )) is The data sample point position in the plurality of OFDM symbols is a correlation value of (j + m × (N _FFT + N _CP )); Q is a total number of the plurality of OFDM symbols.
如权利要求2所述的方法，其特征在于，所述接收端计算每段IFFT处理后的数据的相关值序列z_l(p)，符合以下公式：The method according to claim 2, wherein said receiving end calculates a sequence z ₁ (p) of correlation values of each piece of IFFT processed data, which conforms to the following formula:

其中，y_l(p-q)为第l段IFFT处理后的数据中数据采样点位置为(p-q)的数据；p表示第l段IFFT处理后的数据中的任一数据采样点位置；q为相对于数据采样点位置p的偏移量；
为第l段IFFT处理后的数据中数据采样点位置为
的数据的共轭；L_FFT为所述FFT长度，L_cont为所述CP固定长度；Where y _l (pq) is the data of the data sampling point position (pq) in the data of the 1st segment of the IFFT processing; p represents the position of any data sampling point in the data of the 1st segment of the IFFT processing; q is the relative The offset of the data sample point position p;
The data sampling point position in the data processed by the 1st segment IFFT is
Conjugation of data; L _FFT is the FFT length, L _cont is the fixed length of the CP;

所述组合模式对应的相关值序列z(p)，符合以下公式：The correlation value sequence z(p) corresponding to the combined mode conforms to the following formula:
如权利要求5所述的方法，其特征在于，每种组合传输模式对应的累加值序列z_avg(r)，符合以下公式：The method according to claim 5, characterized in that the accumulated value sequence z_avg(r) corresponding to each combined transmission mode conforms to the following formula:

其中，r为累加值序列的索引值，1≤r≤(L_FFT+L_CP)/N_seg；L_CP为该组合模式中的CP长度；z(r+s×(L_FFT+L_CP)/N_seg)为所述多个OFDM符号中数据采样点位置为(r+s×(L_FFT+L_CP)/N_seg)的相关值；S为所述多个OFDM符号的总个数。Where r is the index value of the accumulated value sequence, 1 ≤ r ≤ (L _FFT + L _CP ) / N _seg ; L _CP is the CP length in the combined mode; z (r + s × (L _FFT + L _CP ) /N _seg ) is a correlation value of a data sample point position in the plurality of OFDM symbols (r+s×(L _FFT +L _CP )/N _seg ); S is a total number of the plurality of OFDM symbols.
如权利要求1-6任一项所述的方法，其特征在于，还包括：The method of any of claims 1-6, further comprising:

所述接收端基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围；The receiving end determines, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data sampling point position range in which the absolute value of the accumulated value is greater than a set threshold and includes an accumulated value with the largest absolute value;

所述接收端以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。The receiving end synchronizes the plurality of OFDM symbols with reference to an intermediate data sampling point position in the data sampling point location range.
一种接收端，应用于正交频分复用OFDM***，其特征在于，包括：A receiving end is applied to an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system, and includes:

收发器，用于接收数据，所述数据包括多个OFDM符号；a transceiver, configured to receive data, where the data includes multiple OFDM symbols;

存储器，用于存储程序指令；a memory for storing program instructions;

处理器，用于调用存储在所述存储器中的程序指令执行：a processor for invoking program instruction execution stored in the memory:

针对H个快速傅立叶变换FFT长度中每个FFT长度对应的K个循环前缀CP长度，分别将每个FFT长度与所述K个CP长度中每个CP长度组合，得到H*K种组合模式；其中，H、K为正整数，每个FFT长度与K种组合模式对应；一种组合模式与一个相关值序列对应，所述相关值序列是基于预设的CP固定长度和所述组合模式中的FFT长度计算得到的；For each of the K cyclic prefix CP lengths corresponding to each FFT length of the H fast Fourier transform FFT lengths, each FFT length is combined with each of the K CP lengths to obtain an H*K combination mode; Wherein, H and K are positive integers, and each FFT length corresponds to K combination modes; one combination mode corresponds to a correlation value sequence, and the correlation value sequence is based on a preset CP fixed length and the combination mode Calculated by the FFT length;

针对每种组合模式，将所述收发器接收的多个OFDM符号内每个OFDM符号中相同数据采样点位置的相关值累加得到1个累加值序列；其中，所述多个OFDM符号内每个OFDM符号的相同数据位置是基于所述组合模式中的CP长度和FFT长度确定的；所述H*K种组合模式对应H*K个累加值序列；For each combined mode, the same data in each OFDM symbol within the plurality of OFDM symbols received by the transceiver Accumulating correlation values of sample point locations to obtain a sequence of accumulated values; wherein the same data position of each OFDM symbol within the plurality of OFDM symbols is determined based on a CP length and an FFT length in the combined mode; *K combination mode corresponds to H*K accumulated value sequences;

将所述H*K个累加值序列中的绝对值最大的一个累加值所在的累加值序列对应的组合模式作为传输模式。A combination mode corresponding to the accumulated value sequence in which one of the H*K accumulated value sequences has the largest absolute value is used as the transmission mode.
如权利要求8所述的接收端，其特征在于，所述处理器，在基于所述CP固定长度和所述组合模式中的FFT长度计算得到所述相关值序列时，具体用于：The receiving end according to claim 8, wherein the processor, when calculating the sequence of correlation values based on the fixed length of the CP and the FFT length in the combined mode, is specifically used to:

对所述多个OFDM符号进行FFT处理，得到FFT处理后的数据；Performing FFT processing on the plurality of OFDM symbols to obtain FFT processed data;

将所述FFT处理后的数据均分成N_seg段，并对每段FFT处理后的数据进行快速傅立叶逆变换IFFT处理，得到N_seg段IFFT处理后的数据；其中，N_seg为2t，t为正整数；The FFT processed data is divided into N _seg segments, and each FFT processed data is subjected to fast inverse Fourier transform IFFT processing to obtain N _seg segment IFFT processed data; wherein N _seg is 2t, t is Positive integer

根据所述CP固定长度、N_seg和所述FFT长度，分别计算每段IFFT处理后的数据的相关值序列，得到N_seg段IFFT处理后的数据分别对应的相关值序列；Calculating, according to the fixed length of the CP, the N _seg and the FFT length, a sequence of correlation values of the data after each IFFT processing, and obtaining a sequence of correlation values corresponding to the data processed by the N _seg segment IFFT;

将所述N_seg段IFFT处理后的数据中每段IFFT处理后的数据中相同数据采样点位置，在N_seg段IFFT处理后的数据分别对应的相关值序列中的对应相关值相加，得到所述相关值序列。And adding, in the N _seg segment IFFT processed data, the same data sampling point position in each IFFT processed data, and adding corresponding correlation values in the correlation value sequence corresponding to the N _seg segment IFFT processed data respectively, to obtain The sequence of correlation values.
如权利要求8所述的接收端，其特征在于，每种组合模式对应的相关值序列x(n)，符合以下公式：The receiving end according to claim 8, wherein the sequence of correlation values x(n) corresponding to each combination mode conforms to the following formula:

其中，y(n-i)为所述多个OFDM符号中数据采样点位置为(n-i)的数据；n表示所述多个OFDM符号中的任一数据采样点位置；i为相对于数据采样点位置n的偏移量；y^*(n-i-N_FFT)为所述多个OFDM符号中数据采样点位置为(n-i-N_FFT)的数据的共轭；N_FFT为该组合模式中的FFT长度，N_cont为所述CP固定长度。Where y(ni) is data of a data sample point position (ni) in the plurality of OFDM symbols; n represents a position of any one of the plurality of OFDM symbols; i is a position relative to a data sampling point The offset of n; y ^* (niN _FFT ) is the conjugate of the data sample point position in the plurality of OFDM symbols (niN _FFT ); N _FFT is the FFT length in the combined mode, and N _cont is Said CP fixed length.
如权利要求10所述的接收端，其特征在于，每种组合传输模式对应的累加值序列x_avg(j)，符合以下公式：The receiving end according to claim 10, wherein the accumulated value sequence x_avg(j) corresponding to each combined transmission mode conforms to the following formula:

其中，j为累加值序列的索引值，1≤j≤(N_FFT+N_CP)；N_CP为该组合模式中的CP长度；x(j+m×(N_FFT+N_CP))为所述多个OFDM符号中数据采样点位置为(j+m×(N_FFT+N_CP))的相关值；Q为所述多个OFDM符号的总个数。Where j is the index value of the accumulated value sequence, 1 ≤ j ≤ (N _FFT + N _CP ); N _CP is the CP length in the combined mode; x (j + m × (N _FFT + N _CP )) is The data sample point position in the plurality of OFDM symbols is a correlation value of (j + m × (N _FFT + N _CP )); Q is a total number of the plurality of OFDM symbols.
如权利要求9所述的接收端，其特征在于，所述处理器计算每段IFFT处理后的数据的相关值序列z_l(p)，符合以下公式：The receiving end according to claim 9, wherein said processor calculates a sequence of correlation values z _l (p) of each piece of IFFT processed data, which conforms to the following formula:

其中，y_l(p-q)为第l段IFFT处理后的数据中数据采样点位置为(p-q)的数据；p表示第l段IFFT处理后的数据中的任一数据采样点位置；q为相对于数据采样点位置p的偏移量；
为第l段IFFT处理后的数据中数据采样点位置为
的数据的共轭；L_FFT为所述FFT长度，L_cont为所述CP固定长度；Where y _l (pq) is the data of the data sampling point position (pq) in the data of the 1st segment of the IFFT processing; p represents the position of any data sampling point in the data of the 1st segment of the IFFT processing; q is the relative The offset of the data sample point position p;
The data sampling point position in the data processed by the 1st segment IFFT is
Conjugation of data; L _FFT is the FFT length, L _cont is the fixed length of the CP;

所述组合模式对应的相关值序列z(p)，符合以下公式：The correlation value sequence z(p) corresponding to the combined mode conforms to the following formula:
如权利要求12所述的接收端，其特征在于，每种组合传输模式对应的累加值序列z_avg(r)，符合以下公式：The receiving end according to claim 12, wherein the accumulated value sequence z_avg(r) corresponding to each combined transmission mode conforms to the following formula:

其中，r为累加值序列的索引值，1≤r≤(L_FFT+L_CP)/N_seg；L_CP为该组合模式中的CP长度；z(r+s×(L_FFT+L_CP)/N_seg)为所述多个OFDM符号中数据采样点位置为(r+s×(L_FFT+L_CP)/N_seg)的相关值；S为所述多个OFDM符号的总个数。Where r is the index value of the accumulated value sequence, 1 ≤ r ≤ (L _FFT + L _CP ) / N _seg ; L _CP is the CP length in the combined mode; z (r + s × (L _FFT + L _CP ) /N _seg ) is a correlation value of a data sample point position in the plurality of OFDM symbols (r+s×(L _FFT +L _CP )/N _seg ); S is a total number of the plurality of OFDM symbols.
如权利要求9-13任一项所述的接收端，其特征在于，所述处理器，还用于：The receiving end according to any one of claims 9 to 13, wherein the processor is further configured to:

基于所述绝对值最大的一个累加值所在的累加值序列，确定累加值的绝对值大于设定阈值、且包含所述绝对值最大的一个累加值的数据采样点位置范围；Determining, according to the accumulated value sequence in which the accumulated value of the absolute value is the largest, the data sampling point position range in which the absolute value of the accumulated value is greater than a set threshold and including an accumulated value of the absolute maximum value;

以所述数据采样点位置范围中的中间数据采样点位置为基准，对所述多个OFDM符号进行同步。The plurality of OFDM symbols are synchronized based on an intermediate data sample point position in the data sample point location range.
一种计算机存储介质，其特征在于，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令在被所述计算机调用时用于使所述计算机执行权利要求1-7任一项所述的方法。 A computer storage medium, wherein the computer storage medium stores computer executable instructions for causing the computer to perform any of claims 1-7 when invoked by the computer The method described in the item.