WO2013078656A1 - Method and device for frame synchronization in optical fiber system - Google Patents
Method and device for frame synchronization in optical fiber system Download PDFInfo
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- WO2013078656A1 WO2013078656A1 PCT/CN2011/083293 CN2011083293W WO2013078656A1 WO 2013078656 A1 WO2013078656 A1 WO 2013078656A1 CN 2011083293 W CN2011083293 W CN 2011083293W WO 2013078656 A1 WO2013078656 A1 WO 2013078656A1
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- H—ELECTRICITY
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- H04B10/25—Arrangements specific to fibre transmission
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- H04J3/00—Time-division multiplex systems
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- H04J3/0605—Special codes used as synchronising signal
Abstract
Embodiments of the present invention provide a method and device for frame synchronization in an optical fiber system, which relate to the field of communications, increase the efficiency of data transmission, reduce the complexity of frame synchronization parallel, and increase the precision of frame synchronization. The method comprises: converting a digital signal with a phase adjusted into a frequency domain digital signal; performing dispersion compensation and matched filtering on the frequency domain digital signal; converting the frequency domain digital signal after dispersion compensation and matched filtering into a time domain digital signal; calculating power of the time domain digital signal to determine a frame header location of each frame of the time domain digital signal, so as to complete frame synchronization lock. The embodiments of the present invention are applied to frame synchronization.
Description
一种光纤系统中帧同步的方法及装置 技术领域 Method and device for frame synchronization in optical fiber system
本发明涉及通信领域， 尤其涉及一种光纤系统中帧同步的方法及装 置。 背景技术 The present invention relates to the field of communications, and in particular, to a method and apparatus for frame synchronization in a fiber optic system. Background technique
现有相关接收数字通信系统中， 在实现帧同步时通常是在符号 同步之后进行时域相关处理， 即匹配滤波处理， 寻找时域相关后的 峰值以判断帧头的位置。 In the existing related receiving digital communication system, when frame synchronization is implemented, time domain correlation processing, that is, matching filtering processing, is performed after symbol synchronization, and the peak value after time domain correlation is searched to determine the position of the frame header.
这种实行方式需要很长的滤波器阶数， 在超高数据率场景下的 帧同步实现较为复杂， 且在接收机的信号还未补偿好的条件下单帧 相关峰的帧同步误差也较大。 例如， 在光通信的相关接收系统中， 帧同步通常是在符号同步之后， PMD ( polarization-mode dispersion , 偏振模色散）， PDL ( polarization dependent loss , 偏振相关损耗） 和 SOP ( state of polarization , 光的偏振态 ) 补偿 (均衡） 之前完成的， 帧同步时接收机的信号还未补偿好， 而且光通信是超高数据率 ( 40Gbps ~ l OOGbps 甚至更高速率） 的接收系统， 此时串行的时域 单帧相关 （ 匹配滤波） 无法实现该场景下大数据率的帧同步。 This implementation requires a long filter order, and the frame synchronization implementation in the ultra-high data rate scenario is complicated, and the frame synchronization error of the single-frame correlation peak is also better when the receiver signal is not compensated. Big. For example, in an associated receiving system for optical communication, frame synchronization is usually after symbol synchronization, PMD (polarization-mode dispersion), PDL (polarization dependent loss), and SOP (state of polarization, light). The polarization state) compensation (equalization) is completed before, the receiver signal is not compensated well during frame synchronization, and the optical communication is a receiving system with ultra-high data rate (40Gbps ~ l OOGbps or higher), at this time serial Time domain single frame correlation (matching filtering) The frame synchronization of large data rates in this scenario cannot be achieved.
由此可见， 在现有帧同步技术中存在数据率传输慢、 精度低、 帧同步复杂性大的问题。 发明内容 It can be seen that in the existing frame synchronization technology, there is a problem that the data rate is slow, the precision is low, and the frame synchronization complexity is large. Summary of the invention
本发明的实施例提供一种光纤系统中帧同步的方法及装置， 有 效提高了数据传输效率、 降低了帧同步的复杂度。 Embodiments of the present invention provide a method and apparatus for frame synchronization in a fiber optic system, which effectively improves data transmission efficiency and reduces frame synchronization complexity.
为达到上述目 的， 本发明的实施例采用如下技术方案： In order to achieve the above objectives, embodiments of the present invention adopt the following technical solutions:
一方面， 提供一种光纤系统帧同步的方法， 包括： In one aspect, a method for frame synchronization of a fiber optic system is provided, including:
将完成相位调整的数字信号转换为频域数字信号； Converting the phase-adjusted digital signal into a frequency domain digital signal;
对所述频域数字信号进行色散补偿和匹配滤波；
将所述色散补偿和匹配滤波后的频域数字信号转换为时域数字 信号； Performing dispersion compensation and matched filtering on the frequency domain digital signal; Converting the dispersion-compensated and matched-filtered frequency-domain digital signals into time-domain digital signals;
对所述时域数字信号进行功率计算以确定所述时域数字信号各 帧的帧头位置， 完成帧同步。 Power calculation is performed on the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
另一方面， 提供一种光纤系统帧同步的装置， 包括： In another aspect, an apparatus for providing frame synchronization of a fiber optic system includes:
时频转换模块， 用于将完成相位调整的数字信号转换为频域数 字信号； a time-frequency conversion module, configured to convert a digital signal that completes phase adjustment into a frequency domain digital signal;
滤波模块，用于对所述频域数字信号进行色散补偿和匹配滤波； 频时转换模块， 用于将所述色散补偿和匹配滤波后的频域数字 信号转换为时域数字信号； a filtering module, configured to perform dispersion compensation and matched filtering on the frequency domain digital signal; a frequency time conversion module, configured to convert the dispersion compensation and the matched filtered frequency domain digital signal into a time domain digital signal;
帧同步模块， 用于对所述时域数字信号进行功率计算以确定所 述时域数字信号各帧的帧头位置， 完成帧同步。 And a frame synchronization module, configured to perform power calculation on the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and complete frame synchronization.
本发明实施例提供的光纤系统中帧同步的方法及装置， 通过将 串行时域数字信号转换为并行的频域数字信号进行色散补偿和匹配 滤波， 有效的提高了数据传输效率、 降低了帧同步的复杂度。 附图说明 The method and device for frame synchronization in the optical fiber system provided by the embodiments of the present invention perform the dispersion compensation and the matched filtering by converting the serial time domain digital signal into the parallel frequency domain digital signal, thereby effectively improving the data transmission efficiency and reducing the frame. The complexity of synchronization. DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下 面将对实施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的一些实施例， 对于 本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以 根据这些附图获得其他的附图。 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.
图 1 为本发明实施例提供的一种光纤系统中帧同步的装置示意 图； 1 is a schematic diagram of a device for frame synchronization in a fiber optic system according to an embodiment of the present invention;
图 2为本发明实施例提供的两种帧结构示意图； 2 is a schematic structural diagram of two frames according to an embodiment of the present invention;
图 3 为本发明实施例提供的一种光纤系统中帧同步的方法流程 示意图； 3 is a schematic flowchart of a method for frame synchronization in a fiber optic system according to an embodiment of the present invention;
图 4为本发明实施例提供的另一种光纤系统中帧同步的方法流 程示意图；
图 5 为本发明实施例提供的另一种光纤系统中帧同步的方法流 程示意图； 4 is a schematic flowchart of a method for frame synchronization in another optical fiber system according to an embodiment of the present invention; FIG. 5 is a schematic flowchart of a method for frame synchronization in another optical fiber system according to an embodiment of the present disclosure;
图 6为本发明实施例提供的另一种光纤系统中帧同步的方法流 程示意图； 6 is a schematic flowchart of a method for frame synchronization in another optical fiber system according to an embodiment of the present invention;
图 7为本发明实施例提供的一种光纤系统中帧同步的装置示意 图。 具体实施方式 FIG. 7 is a schematic diagram of a device for frame synchronization in a fiber optic system according to an embodiment of the present invention. detailed description
下面将结合本发明实施例中的附图， 对本发明实施例中的技术 方案进行清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明 一部分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本 领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他 实施例， 都属于本发明保护的范围。 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
示例性的， 本发明实施例主要应用于超高数据率光纤系统的接 收机。 Illustratively, embodiments of the present invention are primarily applicable to receivers of ultra high data rate fiber optic systems.
本发明实施例提供的光纤系统中帧同步的装置， 如图 1 所示， 模数转换模块 12用于完成模数转换功能， 将输入的模拟信号进行采 样、 量化处理后， 输出转化后的 8bit 数字信号。 增益控制模块 13 对模数转换模块 12输出数据求平均功率， 然后， 与目标功率比较， 产生功率调整控制信号， 通过放大器模块 11 和增益控制模块 13 构 成的增益调整环路， 调整放大器模块 11 的增益， 以调整输入模数转 换模块 12 的模拟信号的功率。 相位调整模块 14计算数字信号的鉴 相误差， 并完成数字信号相位的调整得到数字信号 X ( n)。 在时频 转换模块 15 中本发明实施例优选采用快速傅立叶变换完成对输入 数字信号从时域到频域的转换功能， 这里对输入信号 X ( n ) 进行 N 点快速傅里叶变换处理得到频域的数字信号 X ( k ), 然后滤波模块 16对 X ( k ) 进行色散补偿和匹配滤波。 在实际应用中， 光纤链路存 在色散值， 因此需要通过补偿系数测算单元 161 算出频域的数字信 号 X( k )的色散值， 然后通过滤波单元 162对频域的数字信号 X( k )
进行色散补偿； 具体的， 补偿系数测算单元 161 先通过 MPI (Multi Point Interface, 多点接口）在色散补偿前的频域的数字信号 X ( k) 中提取数据，要求对每个时频转换模块 15重复提取 N次数据，然后， 对已提取的数据进行处理， 计算出链路的色散值得到色散补偿系数， 然后滤波单元 162 4巴色散补偿系数和匹配滤波用的帧头匹配序列的 频域变换 H( k)相乘后与频域数字信号 X(k)频域相乘得到色散补偿 和匹配滤波后的后的频域数字信号 Y ( k), 或者， 这里也可以是滤 波单元 162 先将色散补偿系数与频域数字信号 X(k)频域相乘得到色 散补偿后的频域数字信号， 然后再将色散补偿后的频域数字信号根 据匹配滤波用的帧头匹配序列的频域变换 H ( k) 进行匹配滤波， 最 后得到频域数字信号 Y ( k)。 在接收机端的帧头匹配序列是和发射 机端用在信号帧头的帧头匹配序列相同。 The apparatus for frame synchronization in the optical fiber system according to the embodiment of the present invention is as shown in FIG. 1. The analog-to-digital conversion module 12 is configured to perform an analog-to-digital conversion function, and after sampling and quantizing the input analog signal, outputting the converted 8 bits. Digital signal. The gain control module 13 averages the output data of the analog-to-digital conversion module 12, and then, compared with the target power, generates a power adjustment control signal, and adjusts the amplifier module 11 through the gain adjustment loop formed by the amplifier module 11 and the gain control module 13. The gain is used to adjust the power of the analog signal input to the analog to digital conversion module 12. The phase adjustment module 14 calculates the phase error of the digital signal and completes the adjustment of the phase of the digital signal to obtain a digital signal X(n). In the time-frequency conversion module 15, the embodiment of the present invention preferably performs fast-Fourier transform to convert the input digital signal from the time domain to the frequency domain, where the input signal X ( n ) is subjected to N-point fast Fourier transform processing to obtain a frequency. The digital signal X(k) of the domain is then filtered by filter module 16 for X(k) dispersion and matched filtering. In practical applications, the fiber link has a dispersion value. Therefore, the compensation coefficient calculation unit 161 is required to calculate the dispersion value of the digital signal X(k) in the frequency domain, and then pass through the filtering unit 162 to the digital signal X(k) in the frequency domain. Performing dispersion compensation; specifically, the compensation coefficient measuring unit 161 first extracts data in the frequency domain digital signal X ( k) before the dispersion compensation by MPI (Multi Point Interface), and requires each time-frequency conversion module 15 repeatedly extracting N times of data, and then processing the extracted data, calculating the dispersion value of the link to obtain a dispersion compensation coefficient, and then filtering the unit 162 4 dispersion compensation coefficient and the frequency domain of the frame matching sequence for matching filtering After the transform H(k) is multiplied and multiplied by the frequency domain digital signal X(k) frequency domain, the dispersion-compensated and matched-filtered frequency-domain digital signal Y(k) is obtained, or it may be the filtering unit 162 first. The dispersion compensation coefficient is multiplied by the frequency domain digital signal X(k) frequency domain to obtain a dispersion-compensated frequency domain digital signal, and then the dispersion-compensated frequency domain digital signal is used according to the frequency domain of the matched frame header matching sequence. Transform H ( k) for matched filtering, and finally obtain the frequency domain digital signal Y ( k). The frame header matching sequence at the receiver end is the same as the frame header matching sequence used at the transmitter side of the signal frame header.
然后通过频时转换模块 17 完成频域数字信号到时域数字信号 的变换， 该模块中本发明实施例中优选采用快速傅立叶反变换， 即 对色散补偿和匹配滤波后的频域数字信号 Y( k)进行 N点得快速傅 立叶反变换得到时域数字信号 Y ( n)。 最后帧同步模块 18通过对色 散补偿和匹配滤波后的时域数字信号 Υ ( η ) 进行功率计算以确定时 域数字信号 Υ ( η) 各帧的帧头位置， 完成帧同步锁定。 Then, the frequency domain digital signal is converted to the time domain digital signal by the frequency-time conversion module 17. In the embodiment of the present invention, the inverse fast Fourier transform is used, that is, the dispersion-compensated and matched-filtered frequency domain digital signal Y ( k) Performing an inverse fast Fourier transform of the N point to obtain a time domain digital signal Y(n). The last frame synchronization module 18 performs power calculation on the dispersion-compensated and matched-filtered time domain digital signal Υ( η ) to determine the frame head position of each frame of the time domain digital signal Υ ( η ) to complete the frame synchronization lock.
具体确定帧头位置的实现方案在下面内容进行详述： The implementation scheme for specifically determining the position of the frame header is described in detail below:
如图 2 所示为本发明实施例提供的两种帧结构， 即： 如 2-a所 示的数字信号的帧结构中， 每个帧的开始位置处具有帧头标识。 如 2-b 所示的数字信号的帧结构中， 每个帧的开始位置处具有帧头标 识， 且含有帧头标识的每个帧为连续的复数个长度相同的数据块。 其中， PN ( pseudorandom, 伪随机） 码为帧头导频 PN 码， "v" 表 示帧头 PN码包含的符号数列（ 当然 PN码内的符号数是可以设定的 此处不做具体限定）， "N" 为帧内待传输的符号数列， 其中， 如 2-b 所示的帧结构示例性的在图中将一个整帧分为 M 块数据块 （ 即 BLK1-BLKM ) 进行传输。 As shown in FIG. 2, the two frame structures provided by the embodiment of the present invention, that is, the frame structure of the digital signal as shown in 2-a, has a frame header identifier at the beginning of each frame. In the frame structure of the digital signal as shown in 2-b, each frame has a frame header at the beginning of the frame, and each frame containing the header identifier is a contiguous plurality of data blocks of the same length. The PN (pseudorandom) code is a frame header pilot PN code, and "v" indicates a symbol sequence included in the frame header PN code (of course, the number of symbols in the PN code is configurable and is not specifically limited herein) "N" is the symbol sequence to be transmitted in the frame, wherein the frame structure as shown by 2-b exemplarily divides an entire frame into M block data blocks (ie, BLK1-BLKM) for transmission.
按照上述的两种帧结构， 帧同步模块 18对接收到的 X和 Y偏
振数据进行功率计算， 找到帧头位置完成帧锁定， 这里不管是 X偏 振还是 Y偏振搜索帧头位置的方法是相同的， 因此示例性的以 X或 Y的其中之一偏振状态为例进行说明。 According to the above two frame structures, the frame synchronization module 18 pairs the received X and Y offsets. The vibration data is used for power calculation, and the frame head position is found to complete the frame lock. Here, the method of searching for the position of the frame head is the same whether the X-polarization or the Y-polarization is used. Therefore, an exemplary one of X or Y polarization states is taken as an example for illustration. .
其中， 帧同步模块 1 8 包括： 功率计算单元 181和搜帧单元 182。 首先， 功率计算单元 181计算时域数字信号 Y ( n ) 每个帧长范围内 的各个采样点的功率值， 在连续的复数个帧长范围内， 将各个帧长 范围内对应于同一采样点的功率值进行累加， 得到一个帧长范围内 各个采样点所对应的累加功率值； 搜帧单元 1 82 将得到的一个帧长 范围内各个采样点所对应的累加功率值中最大的累加功率值与预设 帧同步功率门限进行比较； 如果最大的累加功率值大于预设帧同步 功率门限， 则将最大的累加功率值对应的采样点确定为时域数字信 号 Υ ( η ) 各帧的帧头位置， 完成帧同步。 The frame synchronization module 1 8 includes: a power calculation unit 181 and a search frame unit 182. First, the power calculation unit 181 calculates the power value of each sampling point in the range of each frame length of the time domain digital signal Y ( n ), and corresponds to the same sampling point in each frame length range within a continuous plurality of frame length ranges. The power values are accumulated to obtain an accumulated power value corresponding to each sampling point in a frame length range; the frame searching unit 1 82 will obtain the largest accumulated power value among the accumulated power values corresponding to each sampling point within a frame length range. Comparing with the preset frame synchronization power threshold; if the maximum accumulated power value is greater than the preset frame synchronization power threshold, determining the sampling point corresponding to the largest accumulated power value as the frame header of each frame of the time domain digital signal Υ ( η ) Position, complete frame synchronization.
此外， 为了增加帧同步的精确度在功率计算单元 181 得到一个 帧长范围内各个采样点所对应的累加功率值后， 搜帧单元 182 可以 采取以下两种方式找到帧头位置完成帧同步： In addition, in order to increase the accuracy of the frame synchronization, after the power calculation unit 181 obtains the accumulated power value corresponding to each sample point within a frame length range, the search frame unit 182 can find the frame header position to complete the frame synchronization in the following two ways:
第一： 搜帧单元 1 82首先搜索得到的一个帧长范围内各个采样 点所对应的累加功率值中最大的累加功率值； 在该最大的累加功率 值对应的采样点前后等距离的范围内 （ [-(L/2),(L/2)]， 此处可以精确 到两个采样点的范围 ）， 将大于预设同步功率门限的所有累加功率值 所对应的采样点进行平均， 得到帧同步采样点； 将该帧同步采样点 确定为时域数字信号 Y ( n ) 各帧的帧头位置， 完成帧同步。 在此过 程中可以将帧同步的精度确定在两个采样点范围内极大地增加了帧 同步的精度， 此外在采用如图 2 中 2-b 的帧结构时， 由于是在数据 块内进行功率累加相对于采用如图 2 中 2-a 的帧结构在帧长范围内 进行功率累加， 能有效地节省实现资源。 First: the search frame unit 1 82 first searches for the largest accumulated power value among the accumulated power values corresponding to each sample point in a range of the frame length; within the range of the equidistant distance between the sample points corresponding to the maximum accumulated power value ( [-(L/2), (L/2)], where the range of two sampling points can be accurate), and the sampling points corresponding to all accumulated power values greater than the preset synchronous power threshold are averaged to obtain The frame synchronization sampling point is determined as the frame header position of each frame of the time domain digital signal Y ( n ), and the frame synchronization is completed. In this process, the accuracy of the frame synchronization can be determined to greatly increase the accuracy of the frame synchronization within the range of two sampling points. In addition, when the frame structure of 2-b in Fig. 2 is adopted, since the power is performed in the data block, Accumulating the power accumulation in the frame length range with respect to the frame structure of 2-a as shown in FIG. 2 can effectively save the realization resources.
第二： 搜帧单元 1 82首先搜索得到的一个帧长范围内各个采样 点所对应的累加功率值中最大的累加功率值， 并计算时域数字信号 Y ( n ) 在连续的复数个帧长范围内的平均功率值； 当该平均功率值 小于或等于预设平均功率门限， 且最大的累积功率值大于预设同步
功率门限时， 则： 在最大的累加功率值对应的采样点前后等距离的 范围内 （ [-(L/2),(L/2)]， 此处可以精确到两个采样点的范围 ）， 将大 于预设同步功率门限的所有累加功率值所对应的采样点进行平均， 得到帧同步采样点； 将该帧同步采样点确定为时域数字信号 Y ( n ) 各帧的帧头位置， 完成帧同步。 在此过程中可以将帧同步的精度确 定在两个采样点范围内极大地增加了帧同步的精度， 此外在采用如 图 2 中 2-b 的帧结构时， 由于是在数据块内进行功率累加相对于采 用如图 2 中 2-a 的帧结构在帧长范围内进行功率累加， 能有效地节 省实现资源。 Second: the search frame unit 1 82 first searches for the largest accumulated power value among the accumulated power values corresponding to each sample point within a frame length range, and calculates the time domain digital signal Y ( n ) in consecutive multiple frame lengths. The average power value in the range; when the average power value is less than or equal to the preset average power threshold, and the maximum accumulated power value is greater than the preset synchronization At the power threshold, then: within the range of the distance between the sampling points corresponding to the maximum accumulated power value ([-(L/2), (L/2)], where the range of the two sampling points can be accurate) And averaging sampling points corresponding to all accumulated power values of the preset synchronous power threshold to obtain a frame synchronization sampling point; determining the frame synchronous sampling point as a frame header position of each frame of the time domain digital signal Y ( n ), Complete frame synchronization. In this process, the accuracy of the frame synchronization can be determined to greatly increase the accuracy of the frame synchronization within the range of two sampling points. In addition, when the frame structure of 2-b in Fig. 2 is adopted, since the power is performed in the data block, Accumulating the power accumulation in the frame length range with respect to the frame structure of 2-a as shown in FIG. 2 can effectively save the realization resources.
进一步的， 为了去除通信系统引入的噪声可以在功率计算单元 181 配置一个噪声功率门限值， 用来在计算时域数字信号 Y ( n ) 每 个帧长范围内的各个采样点的功率值之后将时域数字信号 Y ( n )每 个帧长范围内的各个采样点的功率值与预设的噪声功率门限值进行 比较， 将功率值小于预设的噪声功率门限值的采样点的功率值重新 设置为零。 然后再进行前文实施例提到的功率累加。 Further, in order to remove the noise introduced by the communication system, a noise power threshold value may be configured in the power calculation unit 181 for calculating the power value of each sampling point within each frame length range of the time domain digital signal Y ( n ) Comparing the power value of each sampling point in the range of each frame length of the time domain digital signal Y ( n ) with a preset noise power threshold value, and the sampling point of the power value smaller than the preset noise power threshold value The power value is reset to zero. Then the power accumulation mentioned in the previous embodiment is performed.
本发明实施例提供的光纤系统中帧同步的方法， 如图 3 所示， 包括以下步骤： The method for frame synchronization in the optical fiber system provided by the embodiment of the present invention, as shown in FIG. 3, includes the following steps:
5301 , 将完成相位调整的数字信号转换为频域数字信号。 5301. Convert the phase-adjusted digital signal into a frequency domain digital signal.
5302 , 对频域数字信号进行色散补偿和匹配滤波。 5302. Perform dispersion compensation and matched filtering on the frequency domain digital signal.
5303 , 将色散补偿和匹配滤波后的频域数字信号转换为时域数 字信号。 5303. Convert the dispersion-compensated and matched-filtered frequency domain digital signals into time-domain digital signals.
5304 , 对时域数字信号匹配滤波后进行功率计算以确定时域数 字信号各帧的帧头位置， 完成帧同步锁定。 5304. Perform power calculation on the time domain digital signal after matching and filtering to determine a frame header position of each frame of the time domain digital signal, and complete frame synchronization locking.
本发明实施例提供的光纤系统中帧同步的方法， 通过采用将时 域数字信号转换为并行的频域数字信号匹配滤波的方法实现帧同 步， 有效的提高了数据传输效率、 降低了帧同步过程中数据并行的 复杂度。 The method for frame synchronization in the optical fiber system provided by the embodiment of the present invention implements frame synchronization by converting a time domain digital signal into a parallel frequency domain digital signal matching filtering method, thereby effectively improving data transmission efficiency and reducing frame synchronization process. The complexity of data parallelism.
本发明实施例提供的光纤系统中帧同步的方法， 如图 4所示， 包括以下步骤：
5401 , 通过放大器对输入的模拟信号的功率进行调整。 The method for frame synchronization in the optical fiber system provided by the embodiment of the present invention, as shown in FIG. 4, includes the following steps: 5401, the power of the input analog signal is adjusted by an amplifier.
5402 , 将通过功率调整的模拟信号进行采样、 量化处理并转换 为数字信号。 5402: The power-adjusted analog signal is sampled, quantized, and converted into a digital signal.
5403 , 根据数字信号的功率， 调整放大器的增益。 5403. Adjust the gain of the amplifier according to the power of the digital signal.
5404 , 测量数字信号的鉴相误差， 并根据鉴相误差完成对数字 信号的相位调整。 5404. Measure the phase error of the digital signal, and complete the phase adjustment of the digital signal according to the phase error.
5405 , 将完成相位调整的数字信号转换为频域数字信号。 5405. Convert the digital signal that completes the phase adjustment into a frequency domain digital signal.
5406 , 从频域数字信号中提取数据， 测算出色散值并生成色散 补偿系数。 5406, extracting data from the frequency domain digital signal, measuring the dispersion value and generating a dispersion compensation coefficient.
5407 ,根据色散补偿系数和对帧头的帧头适配序列的频域变换， 对频域数字信号进行色散补偿和匹配滤波。 5407. Perform dispersion compensation and matched filtering on the frequency domain digital signal according to the dispersion compensation coefficient and the frequency domain transformation of the frame header adaptation sequence of the frame header.
5408 , 将色散补偿和匹配滤波后的频域数字信号转换为时域数 字信号。 5408. Convert the dispersion-compensated and matched-filtered frequency domain digital signals into time-domain digital signals.
5409 , 计算时域数字信号每个帧长范围内的各个采样点的功率 值。 5409. Calculate the power value of each sampling point in the range of each frame length of the time domain digital signal.
5410 , 将时域数字信号每个帧长范围内的各个采样点的功率值 与预设的噪声功率门限值进行比较， 将功率值小于预设的噪声功率 门限值的采样点的功率值重新设置为零。 5410. Compare a power value of each sampling point in each frame length of the time domain digital signal with a preset noise power threshold, and set a power value of the sampling point whose power value is smaller than a preset noise power threshold. Reset to zero.
541 1 , 在连续的复数个帧长范围内， 将各个帧长范围内对应于 同一采样点的功率值进行累加， 得到一个帧长范围内各个采样点所 对应的累加功率值。 541 1 . Accumulate the power values corresponding to the same sampling point in each frame length range within a continuous multiple frame length to obtain an accumulated power value corresponding to each sampling point in a frame length range.
5412 , 将得到的一个帧长范围内各个采样点所对应的累加功率 值中最大的累加功率值与预设帧同步功率门限进行比较； 如果最大 的累加功率值大于预设帧同步功率门限， 则将最大的累加功率值对 应的采样点确定为时域数字信号各帧的帧头位置， 完成帧同步。 5412. Compare the largest accumulated power value of the accumulated power values corresponding to each sampling point in a range of the frame length with a preset frame synchronization power threshold; if the maximum accumulated power value is greater than the preset frame synchronization power threshold, The sampling point corresponding to the largest accumulated power value is determined as the frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
需要说明的是， 步骤 S406并不是必需的， 可以在系统初始化或 者测试时执行， 测得色散值并将其保存下来供以后处理使用。 It should be noted that step S406 is not necessary and can be performed during system initialization or testing, and the dispersion value is measured and saved for later processing.
本发明实施例提供的实现帧同步的方法， 通过采用将时域数字 信号转换为并行的频域数字信号进行色散补偿和匹配滤波， 方法实
现帧同步， 有效的提高了数据传输效率、 降低了帧同步的复杂度； 此外， 由于采用了采用了 门限去噪、 整帧多帧功率积累和帧内分块 多帧积累的方式确定帧头位置提高了帧同步的精度。 The method for realizing frame synchronization provided by the embodiment of the present invention performs dispersion compensation and matched filtering by converting a time domain digital signal into a parallel frequency domain digital signal. The frame synchronization is effective, which improves the data transmission efficiency and reduces the complexity of the frame synchronization. In addition, the frame header is determined by adopting the method of threshold denoising, integral frame multi-frame power accumulation and intra-frame block multi-frame accumulation. The position improves the accuracy of the frame synchronization.
如图 5所示，为本发明实施例提供的光纤系统中帧同步的方法， 包括以下步骤： As shown in FIG. 5, a method for frame synchronization in a fiber optic system according to an embodiment of the present invention includes the following steps:
5501 , 通过放大器对输入的模拟信号的功率进行调整。 5501, the power of the input analog signal is adjusted by an amplifier.
5502 , 将通过功率调整的模拟信号进行采样、 量化处理并转换 为数字信号。 5502: The power-adjusted analog signal is sampled, quantized, and converted into a digital signal.
5503 , 根据数字信号的功率， 调整放大器的增益。 5503. Adjust the gain of the amplifier according to the power of the digital signal.
5504 , 测量数字信号的鉴相误差， 并根据鉴相误差完成对数字 信号的相位调整。 5504. Measure the phase error of the digital signal, and complete the phase adjustment of the digital signal according to the phase error.
5505 , 将完成相位调整的数字信号转换为频域数字信号。 5505. Convert the digital signal that completes the phase adjustment into a frequency domain digital signal.
5506 , 从频域数字信号中提取数据， 测算出色散值并生成色散 补偿系数。 5506, extracting data from the frequency domain digital signal, calculating the dispersion value and generating a dispersion compensation coefficient.
5507 ,根据色散补偿系数和对帧头的帧头适配序列的频域变换， 对频域数字信号进行色散补偿和匹配滤波。 5507. Perform dispersion compensation and matched filtering on the frequency domain digital signal according to the dispersion compensation coefficient and the frequency domain transformation of the frame header adaptation sequence of the frame header.
5508 , 将色散补偿和匹配滤波后的频域数字信号转换为时域数 字信号。 5508. Convert the dispersion-compensated and matched-filtered frequency domain digital signals into a time-domain digital signal.
5509 , 计算时域数字信号每个帧长范围内的各个采样点的功率 值。 5509. Calculate the power value of each sampling point in the range of each frame length of the time domain digital signal.
55 10 , 将时域数字信号每个帧长范围内的各个采样点的功率值 与预设的噪声功率门限值进行比较， 将功率值小于预设的噪声功率 门限值的采样点的功率值重新设置为零。 55 10, comparing the power value of each sampling point in the range of each frame length of the time domain digital signal with a preset noise power threshold value, and the power of the sampling point whose power value is less than the preset noise power threshold value The value is reset to zero.
55 1 1 , 在连续的复数个帧长范围内， 将各个帧长范围内对应于 同一采样点的功率值进行累加， 得到一个帧长范围内各个采样点所 对应的累加功率值。 55 1 1 , in a continuous range of multiple frame lengths, accumulate the power values corresponding to the same sampling point in each frame length to obtain an accumulated power value corresponding to each sampling point in a frame length range.
55 12 , 搜索得到的一个帧长范围内各个采样点所对应的累加功 率值中最大的累加功率值； 在最大的累加功率值对应的采样点前后 等距离的范围内， 将大于预设同步功率门限的所有累加功率值所对
应的采样点进行平均， 得到帧同步采样点； 将该帧同步采样点确定 为时域数字信号各帧的帧头位置， 完成帧同步。 55 12, the largest accumulated power value among the accumulated power values corresponding to each sampling point in a range of the length of the frame obtained by the search; in the range of the equal distance before and after the sampling point corresponding to the largest accumulated power value, the preset synchronous power is greater than the preset synchronous power All accumulated power values of the threshold are correct The sampling points are averaged to obtain a frame synchronization sampling point; the frame synchronization sampling point is determined as the frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
需要说明的是， 步骤 S506并不是必需的， 可以在系统初始化或 者测试时执行， 测得色散值并将其保存下来供以后处理使用。 It should be noted that step S506 is not necessary and can be performed during system initialization or testing, and the dispersion value is measured and saved for later processing.
本发明实施例提供的光纤系统中帧同步的方法， 通过采用将时 域数字信号转换为并行的频域数字信号进行色散补偿和匹配滤波的 方法实现帧同步， 有效的提高了数据传输效率、 降低了帧同步的复 杂度； 此外， 由于采用了采用了 门限去噪、 整帧多帧功率积累和帧 内分块多帧积累的方式确定帧头位置提高了帧同步的精度并节约了 实现资源。 The method for frame synchronization in the optical fiber system provided by the embodiment of the present invention implements frame synchronization by using a method of converting a time domain digital signal into a parallel frequency domain digital signal for dispersion compensation and matched filtering, thereby effectively improving data transmission efficiency and reducing The complexity of frame synchronization; In addition, the use of threshold denoising, integer frame multi-frame power accumulation and intra-frame block multi-frame accumulation to determine the frame header position improves the accuracy of frame synchronization and saves resources.
如图 6所示，为本发明实施例提供的光纤系统中帧同步的方法， 包括以下步骤： As shown in FIG. 6, the method for frame synchronization in a fiber optic system according to an embodiment of the present invention includes the following steps:
5601 , 通过放大器对输入的模拟信号的功率进行调整。 5601, the power of the input analog signal is adjusted by an amplifier.
5602 , 将通过功率调整的模拟信号进行采样、 量化处理并转换 为数字信号。 5602: The power-adjusted analog signal is sampled, quantized, and converted into a digital signal.
5603 , 根据数字信号的功率， 调整放大器的增益。 5603, adjusting the gain of the amplifier according to the power of the digital signal.
5604 , 测量数字信号的鉴相误差， 并根据鉴相误差完成对数字 信号的相位调整。 5604. Measure the phase error of the digital signal, and complete the phase adjustment of the digital signal according to the phase error.
5605 , 将完成相位调整的数字信号转换为频域数字信号。 5605. Convert the digital signal that completes the phase adjustment into a frequency domain digital signal.
5606 , 从频域数字信号中提取数据， 测算出色散值并生成色散 补偿系数。 5606, extracting data from the frequency domain digital signal, calculating the dispersion value and generating a dispersion compensation coefficient.
5607 ,根据色散补偿系数和对帧头的帧头适配序列的频域变换， 对频域数字信号进行色散补偿和匹配滤波。 5607. Perform dispersion compensation and matched filtering on the frequency domain digital signal according to the dispersion compensation coefficient and the frequency domain transformation of the frame header adaptation sequence of the frame header.
5608 , 将色散补偿和匹配滤波后的频域数字信号转换为时域数 字信号。 5608, converting the dispersion-compensated and matched-filtered frequency domain digital signals into time-domain digital signals.
5609 , 计算时域数字信号每个帧长范围内的各个采样点的功率 值 5609. Calculate the power value of each sampling point in the range of each frame length of the time domain digital signal.
5610 , 将时域数字信号每个帧长范围内的各个采样点的功率值 与预设的噪声功率门限值进行比较， 将功率值大于所述预设的噪声
功率门限值的采样点的功率值重新设置为零。 5610. Compare a power value of each sampling point in each frame length of the time domain digital signal with a preset noise power threshold, and set the power value to be greater than the preset noise. The power value of the sampling point of the power threshold is reset to zero.
561 1 , 在连续的复数个帧长范围内， 将各个帧长范围内对应于 同一采样点的功率值进行累加， 得到一个帧长范围内各个采样点所 对应的累加功率值。 561 1 . Accumulate the power values corresponding to the same sampling point in each frame length range in a continuous multiple frame length to obtain an accumulated power value corresponding to each sampling point in a frame length range.
5612 , 搜索得到的一个帧长范围内各个采样点所对应的累加功 率值中最大的累加功率值； 计算时域数字数字信号在连续的复数个 帧长范围内的平均功率值； 当平均功率值小于或等于预设平均功率 门限， 且最大的累积功率值大于预设同步功率门限时， 则： 在最大 的累加功率值对应的采样点前后等距离的范围内， 将大于预设同步 功率门限的所有累加功率值所对应的采样点进行平均， 得到帧同步 采样点； 将该帧同步采样点确定为时域数字信号各帧的帧头位置， 完成帧同步。 5612. Search for a maximum accumulated power value among the accumulated power values corresponding to each sampling point within a frame length range; calculate an average power value of the time domain digital digital signal in a continuous multiple frame length range; when the average power value If the preset average power threshold is less than or equal to the preset synchronous power threshold, and the maximum accumulated power value is greater than the preset synchronous power threshold, then: within a range of equal distances before and after the sampling point corresponding to the largest accumulated power value, the preset synchronous power threshold is greater than the preset synchronous power threshold. The sampling points corresponding to all the accumulated power values are averaged to obtain a frame synchronization sampling point; the frame synchronization sampling point is determined as the frame head position of each frame of the time domain digital signal, and frame synchronization is completed.
需要说明的是， 步骤 S606并不是必需的， 可以在系统初始化或 者测试时执行， 测得色散值并将其保存下来供以后处理使用。 It should be noted that step S606 is not necessary and can be performed during system initialization or testing, and the dispersion value is measured and saved for later processing.
本发明实施例提供的光纤系统中帧同步的方法， 通过采用将时 域数字信号转换为并行的频域数字信号进行色散补偿和匹配滤波的 方法实现帧同步， 有效的提高了数据传输效率、 降低了帧同步的复 杂度； 此外， 由于采用了采用了 门限去噪、 整帧多帧功率积累和帧 内分块多帧积累的方式确定帧头位置提高了帧同步的精度并节约了 实现资源。 The method for frame synchronization in the optical fiber system provided by the embodiment of the present invention implements frame synchronization by using a method of converting a time domain digital signal into a parallel frequency domain digital signal for dispersion compensation and matched filtering, thereby effectively improving data transmission efficiency and reducing The complexity of frame synchronization; In addition, the use of threshold denoising, integer frame multi-frame power accumulation and intra-frame block multi-frame accumulation to determine the frame header position improves the accuracy of frame synchronization and saves resources.
本发明实施例提供的一种光纤系统中帧同步的装置 70 , 如图 7 所示， 包括： 时频转换模块 7 1 , 滤波模块 72 , 频时转换模块 73 , 帧同步模块 74。 A device 70 for frame synchronization in an optical fiber system according to an embodiment of the present invention, as shown in FIG. 7, includes: a time-frequency conversion module 7 1 , a filtering module 72 , a frequency-time conversion module 73 , and a frame synchronization module 74 .
时频转换模块 71 , 用于将接收到的具有帧结构的数字信号转换 为频域数字信号。 The time-frequency conversion module 71 is configured to convert the received digital signal having a frame structure into a frequency domain digital signal.
滤波模块 72 , 用于对频域数字信号进行色散补偿和匹配滤波。 频时转换模块 73 , 用于将色散补偿和匹配滤波后的频域数字信 号转换为时域数字信号。 The filtering module 72 is configured to perform dispersion compensation and matched filtering on the frequency domain digital signal. The frequency-time conversion module 73 is configured to convert the dispersion-compensated and matched-filtered frequency-domain digital signals into time-domain digital signals.
帧同步模块 74 , 用于对时域数字信号进行功率计算以确定时域
数字信号各帧的帧头位置， 完成帧同步。 a frame synchronization module 74, configured to perform power calculation on the time domain digital signal to determine a time domain The frame header position of each frame of the digital signal completes the frame synchronization.
本发明实施例提供的光纤系统中帧同步的装置， 通过采用将时 域数字信号转换为并行的频域数字信号进行色散补偿和匹配滤波， 采用多帧积累的方法确定帧头位置实现帧同步， 有效的提高了数据 传输效率、 降低了帧同步过程中数据并行的复杂度。 The apparatus for frame synchronization in the optical fiber system provided by the embodiment of the present invention performs dispersion compensation and matched filtering by converting a time domain digital signal into a parallel frequency domain digital signal, and adopts a multi-frame accumulation method to determine a frame header position to implement frame synchronization. Effectively improve data transmission efficiency and reduce the complexity of data parallelism during frame synchronization.
本发明实施例提供的光纤系统中帧同步的方法及装置， 通过采 用将时域数据转换为并行的频域数据进行色散补偿和匹配滤波的方 法实现帧同步， 有效的提高了数据传输效率、 降低了帧同步的复杂 度。 The method and device for frame synchronization in the optical fiber system provided by the embodiments of the present invention implement frame synchronization by converting time domain data into parallel frequency domain data, thereby effectively improving data transmission efficiency and reducing The complexity of frame synchronization.
另外由于采用了 门限去噪和整帧多帧功率积累及帧内分块多帧 功率积累方式确定帧头位置实现帧同步， 节省了实现资源， 提高了 帧同步的精度。 In addition, due to the use of threshold denoising and full frame multi-frame power accumulation and intra-frame block multi-frame power accumulation to determine the frame header position to achieve frame synchronization, the realization of resources is saved, and the accuracy of frame synchronization is improved.
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围 并不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技 术范围内， 可轻易想到变化或替换， 都应涵盖在本发明的保护范围 之内。 因此， 本发明的保护范围应所述以权利要求的保护范围为准。
The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.
Claims
1、 一种实现帧同步的方法， 其特征在于， 包括： A method for implementing frame synchronization, comprising:
将完成相位调整的数字信号转换为频域数字信号； Converting the phase-adjusted digital signal into a frequency domain digital signal;
对所述频域数字信号进行色散补偿和匹配滤波； Performing dispersion compensation and matched filtering on the frequency domain digital signal;
将所述色散补偿和匹配滤波后的频域数字信号转换为时域数字 信号； Converting the dispersion-compensated and matched-filtered frequency-domain digital signals into time-domain digital signals;
对所述时域数字信号进行功率计算以确定所述时域数字信号各 帧的帧头位置， 完成帧同步。 Power calculation is performed on the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
2、 根据权利要求 1 所述的方法， 其特征在于， 所述将完成相位 调整的时域数字信号转换为频域数字信号之前， 还包括： 2. The method according to claim 1, wherein before the converting the phase-adjusted time domain digital signal into the frequency domain digital signal, the method further includes:
通过放大器对输入的模拟信号的功率进行调整； Adjusting the power of the input analog signal through an amplifier;
将通过功率调整的所述模拟信号进行采样、量化处理并转换为数 字信号； The analog signal that is adjusted by power is sampled, quantized, and converted into a digital signal;
根据所述数字信号的功率， 调整所述放大器的增益； Adjusting a gain of the amplifier according to a power of the digital signal;
测量所述数字信号的鉴相误差，并根据所述鉴相误差完成对所述 数字信号的相位调整。 Measuring a phase error of the digital signal and completing phase adjustment of the digital signal based on the phase error.
3、 根据权利要求 1或 2所述的方法， 其特征在于， 所述对所述 频域数字信号进行色散补偿和匹配滤波包括： The method according to claim 1 or 2, wherein the performing dispersion compensation and matched filtering on the frequency domain digital signal comprises:
从所述频域数字信号中提取数据，测算出色散值并生成色散补偿 系数； Extracting data from the frequency domain digital signal, measuring a dispersion value and generating a dispersion compensation coefficient;
根据所述色散补偿系数和对应于所述帧头的帧头匹配序列的频 域变换， 对所述频域数字信号进行色散补偿和匹配滤波。 Dispersion compensation and matched filtering are performed on the frequency domain digital signal according to the dispersion compensation coefficient and the frequency domain transformation corresponding to the frame header matching sequence of the frame header.
4、 根据权利要求 1 ~ 3任一项所述的方法， 其特征在于， 所述数字信号的帧结构中， 每个帧的开始位置处具有帧头标识， 或所述数字信号的帧结构中， 每个帧的开始位置处具有帧头标 识， 且含有所述帧头标识的每个帧为连续的复数个长度相同的数据 块。 The method according to any one of claims 1 to 3, wherein in the frame structure of the digital signal, a start position of each frame has a frame header identifier, or a frame structure of the digital signal Each frame has a header identifier at the beginning of the frame, and each frame containing the header identifier is a contiguous plurality of data blocks of the same length.
5、 根据权利要求 4所述的方法， 其特征在于， 所述对所述时域 数字信号进行功率计算以确定所述时域数字信号各帧的帧头位置， 完 成帧同步包括： The method according to claim 4, wherein the power calculation is performed on the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, Framing synchronization includes:
计算所述时域数字信号每个帧长范围内的各个采样点的功率值； 在连续的复数个帧长范围内，将各个帧长范围内对应于同一采样 点的功率值进行累加， 得到一个帧长范围内各个采样点所对应的累加 功率值； Calculating a power value of each sampling point in a range of each frame length of the time domain digital signal; accumulating power values corresponding to the same sampling point in each frame length range in a continuous plurality of frame length ranges to obtain one The accumulated power value corresponding to each sampling point within the frame length range;
将所述一个帧长范围内各个采样点所对应的累加功率值中最大 的累加功率值与预设帧同步功率门限进行比较； Comparing a maximum accumulated power value of the accumulated power values corresponding to each sampling point in the range of one frame length with a preset frame synchronization power threshold;
如果所述最大的累加功率值大于所述预设帧同步功率门限，则将 所述最大的累加功率值对应的采样点确定为所述时域数字信号各帧 的帧头位置， 完成帧同步。 And if the maximum accumulated power value is greater than the preset frame synchronization power threshold, determining a sampling point corresponding to the maximum accumulated power value as a frame header position of each frame of the time domain digital signal, and completing frame synchronization.
6、 根据权利要求 4所述的方法， 其特征在于， 所述对所述时域 数字信号进行功率计算以确定所述时域数字信号各帧的帧头位置， 完 成帧同步包括： The method according to claim 4, wherein the calculating the power of the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and completing the frame synchronization comprises:
计算所述时域数字信号每个帧长范围内的各个采样点的功率值； 在连续的复数个帧长范围内，将各个帧长范围内对应于同一采样 点的功率值进行累加， 得到一个帧长范围内各个采样点所对应的累加 功率值； Calculating a power value of each sampling point in a range of each frame length of the time domain digital signal; accumulating power values corresponding to the same sampling point in each frame length range in a continuous plurality of frame length ranges to obtain one The accumulated power value corresponding to each sampling point within the frame length range;
搜索所述一个帧长范围内各个采样点所对应的累加功率值中最 大的累加功率值； Searching for the largest accumulated power value among the accumulated power values corresponding to the respective sampling points in the range of one frame length;
在所述最大的累加功率值对应的采样点前后等距离的范围内，将 大于预设同步功率门限的所有累加功率值所对应的采样点进行平均， 得到帧同步采样点； And sampling the sampling points corresponding to all the accumulated power values of the preset synchronous power threshold to obtain a frame synchronization sampling point in a range of equal distances before and after the sampling point corresponding to the maximum accumulated power value;
将所述帧同步采样点确定为所述时域数字信号各帧的帧头位置， 完成帧同步。 The frame synchronization sampling point is determined as a frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
7、 根据权利要求 4所述的方法， 其特征在于， 所述对所述时域 数字信号进行功率计算以确定所述时域数字信号各帧的帧头位置， 完 成帧同步包括： The method according to claim 4, wherein the calculating the power of the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and completing the frame synchronization comprises:
计算所述时域数字信号每个帧长范围内的各个采样点的功率值； 在连续的复数个帧长范围内，将各个帧长范围内对应于同一采样 点的功率值进行累加， 得到一个帧长范围内各个采样点所对应的累加 功率值； Calculating a power value of each sampling point in a range of each frame length of the time domain digital signal; corresponding to the same sampling in each frame length range within a continuous plurality of frame length ranges The power values of the points are accumulated to obtain an accumulated power value corresponding to each sampling point within a frame length range;
搜索所述一个帧长范围内各个采样点所对应的累加功率值中最 大的累加功率值； Searching for the largest accumulated power value among the accumulated power values corresponding to the respective sampling points in the range of one frame length;
计算所述时域数字数字信号在所述连续的复数个帧长范围内的 平均功率值； Calculating an average power value of the time domain digital digital signal over the continuous plurality of frame lengths;
当所述平均功率值小于或等于预设平均功率门限，且所述最大的 累积功率值大于预设同步功率门限时， 贝' J : When the average power value is less than or equal to a preset average power threshold, and the maximum accumulated power value is greater than a preset synchronization power threshold,
在所述最大的累加功率值对应的采样点前后等距离的范围内，将 大于所述预设同步功率门限的所有累加功率值所对应的采样点进行 平均， 得到帧同步采样点； 将所述帧同步采样点确定为所述时域数字 信号各帧的帧头位置， 完成帧同步。 And sampling the sampling points corresponding to all the accumulated power values of the preset synchronous power threshold to obtain a frame synchronization sampling point in a range of equal distances before and after the sampling point corresponding to the maximum accumulated power value; The frame synchronization sampling point is determined as the frame header position of each frame of the time domain digital signal, and frame synchronization is completed.
8、 根据权利要求 5到 7 中任一项所述的方法， 其特征在于， 所 述计算所述时域数字信号每个帧长范围内的各个采样点的功率值之 后， 还包括： The method according to any one of claims 5 to 7, wherein after calculating the power value of each sampling point in the range of each frame length of the time domain digital signal, the method further includes:
将所述时域数字信号每个帧长范围内的各个采样点的功率值与 预设的噪声功率门限值进行比较， 将功率值小于所述预设的噪声功率 门限值的采样点的功率值重新设置为零。 Comparing the power value of each sampling point in each frame length of the time domain digital signal with a preset noise power threshold, and setting the power value to be smaller than the sampling point of the preset noise power threshold The power value is reset to zero.
9、 一种实现帧同步的装置， 其特征在于， 包括： 9. A device for implementing frame synchronization, comprising:
时频转换模块，用于将完成相位调整的数字信号转换为频域数字 信号； a time-frequency conversion module for converting a digital signal that completes phase adjustment into a frequency domain digital signal;
滤波模块， 用于对所述频域数字信号进行色散补偿和匹配滤波； 频时转换模块，用于将所述色散补偿和匹配滤波后的频域数字信 号转换为时域数字信号； a filtering module, configured to perform dispersion compensation and matched filtering on the frequency domain digital signal; a frequency time conversion module, configured to convert the dispersion compensation and the matched filtered frequency domain digital signal into a time domain digital signal;
帧同步模块，用于对所述时域数字信号进行功率计算以确定所述 时域数字信号各帧的帧头位置， 完成帧同步。 And a frame synchronization module, configured to perform power calculation on the time domain digital signal to determine a frame header position of each frame of the time domain digital signal, and complete frame synchronization.
10、 根据权利要求 9所述的装置， 其特征在于， 还包括： 放大器模块， 用于对输入的模拟信号的功率进行调整； The device according to claim 9, further comprising: an amplifier module, configured to adjust power of the input analog signal;
模数转换模块， 用于将通过功率调整的所述模拟信号进行采样、 量化处理并转换为数字信号； An analog-to-digital conversion module, configured to sample the analog signal that is adjusted by power, Quantize processing and convert to digital signals;
增益控制模块， 用于根据所述数字信号的功率， 调整所述放大器 的增益； a gain control module, configured to adjust a gain of the amplifier according to a power of the digital signal;
相位调整模块， 用于测量所述数字信号的鉴相误差， 并根据所述 鉴相误差完成对所述数字信号的相位调整。 And a phase adjustment module, configured to measure a phase error of the digital signal, and complete phase adjustment of the digital signal according to the phase error.
1 1、 根据权利要求 9或 10所述的装置， 其特征在于， 所述滤波 模块包括： The device according to claim 9 or 10, wherein the filtering module comprises:
补偿系数测算单元， 用于从所述频域数字信号中提取数据， 测算 出色散值并生成色散补偿系数； a compensation coefficient measuring unit, configured to extract data from the frequency domain digital signal, measure an excellent scatter value, and generate a dispersion compensation coefficient;
滤波单元，用于根据所述色散补偿系数和对应于所述帧头的帧头 匹配序列的频域变换， 对所述频域数字信号进行色散补偿和匹配滤 波。 And a filtering unit, configured to perform dispersion compensation and matching filtering on the frequency domain digital signal according to the dispersion compensation coefficient and a frequency domain transform corresponding to a frame header matching sequence of the frame header.
12、 根据权利要求 9〜1 1任一项所述的装置， 其特征在于， 所述 帧同步模块还包括： The device according to any one of claims 9 to 11, wherein the frame synchronization module further comprises:
功率计算单元，用于计算所述时域数字信号每个帧长范围内的各 个采样点的功率值； 在连续的复数个帧长范围内， 将各个帧长范围内 对应于同一采样点的功率值进行累加， 得到一个帧长范围内各个采样 点所对应的累加功率值； a power calculation unit, configured to calculate a power value of each sampling point in each frame length range of the time domain digital signal; and to correspond to power of the same sampling point in each frame length range within a continuous plurality of frame length ranges The values are accumulated to obtain an accumulated power value corresponding to each sampling point within a frame length range;
搜帧单元，用于将所述一个帧长范围内各个采样点所对应的累加 功率值中最大的累加功率值与预设帧同步功率门限进行比较； 如果所 述最大的累加功率值大于所述预设帧同步功率门限， 则将所述最大的 累加功率值对应的采样点确定为所述时域数字信号各帧的帧头位置， 完成帧同步。 a frame search unit, configured to compare a maximum accumulated power value of the accumulated power values corresponding to each sample point in the range of the frame length with a preset frame synchronization power threshold; if the maximum accumulated power value is greater than the Presetting the frame synchronization power threshold, determining a sampling point corresponding to the maximum accumulated power value as a frame header position of each frame of the time domain digital signal, and completing frame synchronization.
13、 根据权利要求 9〜1 1 所述的装置， 其特征在于， 所述帧同步 模块还包括： The device according to any one of claims 9 to 11, wherein the frame synchronization module further comprises:
功率计算单元，还用于计算所述时域数字信号每个帧长范围内的 各个采样点的功率值； 在连续的复数个帧长范围内， 将各个帧长范围 内对应于同一采样点的功率值进行累加， 得到一个帧长范围内各个采 样点所对应的累加功率值； 搜帧单元，还用于搜索所述一个帧长范围内各个采样点所对应的 累加功率值中最大的累加功率值； 在所述最大的累加功率值对应的采 样点前后等距离的范围内， 将大于预设同步功率门限的所有累加功率 值所对应的采样点进行平均， 得到帧同步采样点； 将所述帧同步采样 点确定为所述时域数字信号各帧的帧头位置， 完成帧同步。 The power calculation unit is further configured to calculate a power value of each sampling point in each frame length range of the time domain digital signal; in a continuous plurality of frame length ranges, each frame length corresponds to the same sampling point The power values are accumulated to obtain an accumulated power value corresponding to each sampling point within a frame length range; The frame search unit is further configured to search for a maximum accumulated power value among the accumulated power values corresponding to the sampling points in the range of the one frame length; in a range of equidistant distances between the sampling points corresponding to the maximum accumulated power value, And averaging sampling points corresponding to all accumulated power values of the preset synchronous power threshold to obtain a frame synchronization sampling point; determining the frame synchronization sampling point as a frame header position of each frame of the time domain digital signal, completing the frame Synchronize.
14、 根据权利要求 9〜1 1 所述的装置， 其特征在于， 所述帧同步 模块还包括： The device according to any one of claims 9 to 11, wherein the frame synchronization module further comprises:
功率计算单元，还用于计算所述时域数字信号每个帧长范围内的 各个采样点的功率值； 在连续的复数个帧长范围内， 将各个帧长范围 内对应于同一采样点的功率值进行累加， 得到一个帧长范围内各个采 样点所对应的累加功率值； The power calculation unit is further configured to calculate a power value of each sampling point in each frame length range of the time domain digital signal; in a continuous plurality of frame length ranges, each frame length corresponds to the same sampling point The power values are accumulated to obtain an accumulated power value corresponding to each sampling point within a frame length range;
搜帧单元，还用于搜索所述一个帧长范围内各个采样点所对应的 累加功率值中最大的累加功率值； 计算所述时域数字数字信号在所述 连续的复数个帧长范围内的平均功率值； 当所述平均功率值小于或等 于预设平均功率门限， 且所述最大的累积功率值大于预设同步功率门 限时， 则： 在所述最大的累加功率值对应的采样点前后等距离的范围 内， 将大于所述预设同步功率门限的所有累加功率值所对应的采样点 进行平均， 得到帧同步采样点； 将所述帧同步采样点确定为所述时域 数字信号各帧的帧头位置， 完成帧同步。 a frame search unit, configured to search for a maximum accumulated power value of the accumulated power values corresponding to each sample point in the range of one frame length; and calculate the time domain digital digital signal within the continuous plurality of frame lengths The average power value; when the average power value is less than or equal to a preset average power threshold, and the maximum accumulated power value is greater than a preset synchronization power threshold, then: a sampling point corresponding to the maximum accumulated power value Having averaged the sampling points corresponding to all the accumulated power values of the preset synchronous power threshold to obtain a frame synchronization sampling point; determining the frame synchronization sampling point as the time domain digital signal The frame header position of each frame completes the frame synchronization.
15、 根据权利要求 12〜14所述的装置， 其特征在于， 所述功率计 算单元还用于在计算所述时域数字信号每个帧长范围内的各个采样 点的功率值后将所述时域数字信号每个帧长范围内的各个采样点的 功率值与预设的噪声功率门限值进行比较， 将功率值小于所述预设的 噪声功率门限值的采样点的功率值重新设置为零。 The device according to any one of claims 12 to 14, wherein the power calculation unit is further configured to: after calculating a power value of each sampling point within a range of each frame length of the time domain digital signal, The power value of each sampling point in the range of each frame length of the time domain digital signal is compared with a preset noise power threshold value, and the power value of the sampling point whose power value is smaller than the preset noise power threshold value is re Set to zero.
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| CN103475616B (en) * | 2013-08-26 | 2017-03-01 | 北京握奇数据系统有限公司 | A kind of parallel frame synchronization detection method and system |
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