CN103178933A - Subcarrier modulation miller code decoding device and method - Google Patents

Subcarrier modulation miller code decoding device and method Download PDF

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CN103178933A
CN103178933A CN 201310028243 CN201310028243A CN103178933A CN 103178933 A CN103178933 A CN 103178933A CN 201310028243 CN201310028243 CN 201310028243 CN 201310028243 A CN201310028243 A CN 201310028243A CN 103178933 A CN103178933 A CN 103178933A
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decoding
data
module
state machine
miller
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CN 201310028243
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Chinese (zh)
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孙旭
田永刚
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西安新时达电子信息技术有限公司
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Abstract

The invention belongs to the technical field of miller code decoding and discloses subcarrier modulation miller code decoding device and method. The decoding device comprises a narrow pulse counting module used for recording the number of narrow pulses. An input end of the narrow pulse counting module is connected with a broad pulse recognition module. The broad pulse recognition module is used for recognizing broad pulses in input data. An output end of the narrow pulse counting module is connected with a decoding state machine module which is used for determining states of a decoding state machine. The problem that clock synchronization is difficult is solved, and decoding difficulty and decoding device complexity are lowered.

Description

—种副载波调制米勒码解码装置及其解码方法 - Species Miller subcarrier modulation code decoding apparatus and decoding method

技术领域 FIELD

[0001] 本发明属于米勒码解码技术领域,更具体地,涉及一种副载波调制米勒码解码装置及其解码方法。 [0001] The present invention belongs to the Miller code decoding technology, and more particularly, Miller code decoding apparatus and decoding method relates to a sub-carrier modulation.

背景技术 Background technique

[0002] UHF RFID微波射频识别技术是国际上最先进的第四代自动识别技术,是近几年刚刚开始兴起并得到迅速推广应用的一门新技术,它有识别距离远\识别准确率高、识别速度快、抗干扰能力强、使用寿命长、可穿透非金属材料等特点,运用范围广等特点。 [0002] UHF RFID microwave radio frequency identification technology is the most advanced fourth-generation automatic identification technology, is just beginning to rise in recent years and the rapid popularization and application of a new technology, it has to identify distance \ high recognition accuracy fast recognition speed, anti-interference ability, long service life characteristics, penetrate non-metallic materials, the use of a wide range of features.

[0003] 微波射频自动识别的关键设备主要有射频识别卡、读写器、微波天线等三个组成部分。 [0003] Key microwave radio frequency identification device has three main components of a radio frequency tag, reader, antenna, etc. 射频识别卡,又称电子标签主要用来储存被标识物数据信息,射频识别卡的核心是带有信息收发和储存功能的集成电路,由于其使用时像普通标签一样被粘贴在被识别物体上,因此该装置被形象化地称作“电子标签“。 A radio frequency identification card, also called electronic label is primarily used to store core data identifier information, the radio frequency identification integrated circuit cards with messaging capabilities and storage, due to using the same as a normal label is pasted on the object to be identified , so that the visualization device is referred to as "tag." 读写器,用于读取或写入射频识别卡中的数据,它满足了对快速运动的多个物体或人员进行同时快速准确自动识别的需要。 Reader for reading or writing data in the RFID card, which satisfies the need for a plurality of fast-moving objects or persons simultaneously fast and accurate automatic recognition. 微波天线,它与读写器相连接,主要是向射频识别卡发送和接收相关的数据信号。 Microwave antenna which is connected to the reader, primarily related to transmission and reception of data signals to the radio frequency identification card.

[0004] 随着RFID技术的应用增加,以及空间电磁环境的恶化,读写器与标签之间的通信存在越来越多的干扰。 [0004] With the increasing application of RFID technology, there is more interference between the communication and the deterioration of the electromagnetic environment space, and the tag reader. 在UHF频段的EPC C1G2协议中规定了副载波调制的米勒解码由于其抗干扰性强,应该作为标签与读写器通信的首选。 EPC C1G2 predetermined protocol in the UHF band modulated subcarriers Miller decoding because of its strong anti-tag should be the first choice in communication with the reader.

[0005] 米勒码规定:在相邻的两个数据O之间发生跳变,数据I中间发生跳变,而副载波调制后的米勒码在相邻的两个O之间不跳变,相邻的两个I之间才跳变如图1所示。 [0005] Miller predetermined code: transition occurs between the two adjacent O data, I intermediate data transition occurs, and the code is not Miller subcarrier modulation hopping between two adjacent O only the transition between two adjacent I shown in Fig. 仅凭借跳变边沿判断0,I数据解码实现方法不足以应对,且因为标签回波存在一定的不确定性及不稳定性,对其进行时钟同步也较为困难,且增加了解码方法难度以及解码装置的复杂性。 With the edge transition is determined only 0, I implemented method of decoding data enough to cope with, and because there is a certain instability and uncertainty in the tag return, clock synchronization can be more difficult and increases the difficulty of a decoding method and a decoding complexity of the device.

发明内容 SUMMARY

[0006] 为弥补上述缺陷,本发明提出一种副载波调制米勒码解码装置及其解码方法,本发明技术方案解决了时钟同步的困难问题,降低了解码难度和解码装置的复杂性。 [0006] In order to compensate the above drawbacks, the present invention provides a sub-carrier modulation Miller code decoding apparatus and decoding method aspect of the present invention solves the problem of clock synchronization difficulties, reduces the difficulty and complexity of the decoding device decoding.

[0007] 为了解决上述技术问题,本发明采用以下技术方案予以实现。 [0007] To solve the above problems, the present invention employs the following technical solution be implemented.

[0008] 技术方案一: [0008] Technical Solution a:

[0009] 一种副载波调制米勒码解码装置,其特征在于,包括用于记录窄脉冲个数的窄脉冲计数模块,所述窄脉冲计数模块的输入端连接有宽脉冲识别模块,所述宽脉冲识别模块用于识别输入数据中的宽脉冲;所述窄脉冲计数模块的输出端连接有解码状态机模块,所述解码状态机模块用于确定解码状态机状态信息。 [0009] A subcarrier modulation Miller code decoding apparatus, characterized by comprising means for recording the number of narrow pulses of narrow pulse counting module, of the narrow pulse count module inputs connected to the pulse width of the identification module, the pulse width identification means for identifying the input pulse width data; the narrow pulse counting module connected to the output terminal of the decoding state machine module, said state machine means for decoding the decoding state machine to determine the status information.

[0010] 上述技术方案的特点和进一步改进在于: [0010] Characteristics of the above technical solutions and improvements further comprising:

[0011] (I)所述解码状态机模块的输入端连接有条件处理模块,所述条件处理模块用于设置所述解码状态机模块的解码条件。 [0011] (I) input terminal of the decoder state machine module is connected conditional processing module, decoding the conditional processing condition setting means for decoding said state machine module.

[0012] (2)所述解码状态机模块的输出端连接有解码输出模块,所述解码输出模块用于输出解码数据。 [0012] (2) decoding the state machine module is connected to an output terminal outputting a decoding module, the decoded output means for outputting decoded data. [0013] 技术方案二: [0013] Technical Solution II:

[0014] 一种副载波调制米勒码解码方法,其特征在于,判断输入数据是宽脉冲,还是窄脉冲; [0014] A subcarrier modulation Miller code decoding method, characterized in that the pulse width of the input data is determined, or narrow pulses;

[0015] 如果是窄脉冲,计数器的计数值加I ; [0015] If a narrow pulse, the count value of the counter plus I;

[0016] 如果是宽脉冲,则输出计数值,并对计数值进行判断,得到解码状态机状态信息; [0016] If the pulse width, the count value is output, and the count value is determined to obtain the decoding state machine information;

[0017] 根据解码状态机状态信息进行判定,若起始为导引头数据,则输出解码数据。 [0017] The state machine determines based on the decoding state information, if the initial data for the seeker, the output decoded data.

[0018] 上述技术方案的特点和进一步改进在于: [0018] Characteristics of the above technical solutions and improvements further comprising:

[0019] (I)当找到第一个宽脉冲时开始计数,到下一个宽脉冲时本次计数结束,并开始重新计数。 [0019] (I) when the first to find a pulse width starts counting, this counting ends when the next pulse width, and resumes counting.

[0020] (2)所述导引头数据包括4个码元周期数据O和数据010111。 [0020] (2) the seeker data includes four data symbol periods and the data O 010111.

[0021] (3)所述导引头数据包括8个码元周期数据O和数据010111。 [0021] (3) the guide head comprises eight data symbols and data periods 010 111 O data.

[0022] (4)根据解码长度判断解码是否结束。 [0022] (4) determines the length of the decoding based on the decoding is ended.

[0023] 本发明技术方案,根据米勒副载波导引头编码规则,利用副载波调制的米勒码,通过宽脉冲间的窄脉冲累加个数进行统计整理出解码状态机初始位。 [0023] aspect of the present invention, in accordance with the Miller encoding rules seeker subcarriers, subcarrier modulation using the Miller code, the number of accumulation by the narrow pulse width pulses between the statistical processing initial bit decoding state machine. 本发明技术方案,能够准确快速的判断标签回波的判断位,解决了时钟同步的困难问题,降低了解码难度和解码装置的复杂性。 Aspect of the invention, the label can be determined quickly and accurately determining echo position, to solve the problem of clock synchronization difficulties, reduces the difficulty and complexity of the decoding device decoding.

附图说明 BRIEF DESCRIPTION

[0024] 下面结合附图和具体实施方式对本发明的技术方案作进一步详细说明。 [0024] Next, the technical solution of the present invention will be described in further detail in conjunction with accompanying drawings and specific embodiments.

[0025] 图1为本发明实施例副载波调制米勒码解码装置示意图; [0025] Example 1 a schematic Miller subcarrier modulation code decoding apparatus embodiment of the present invention;

[0026] 图2为本发明实施例米勒码导引头(TRext = O)序列示意图; [0026] Example 2 Miller code seeker (TRext = O) sequence of the present invention, a schematic diagram;

[0027] 图3为本发明实施例米勒码导引头(TRext = I)序列示意图; [0027] Example 3 of the present embodiment seeker Miller code (TRext = I) sequence of schematic invention;

[0028] 图4为本发明实施例副载波调制米勒码序列示意图; [0028] Example 4 subcarriers Miller modulation code sequence schematic embodiment of the present invention;

[0029] 图5为本发明实施例中解码状态机的状态信息列表; [0029] FIG. 5 embodiment state information list decoding state machine embodiment of the invention;

[0030] 图6为图5的解码状态机的状态信息中具体实例图解; Status information [0030] Figure 6 is a state machine decoder 5. Specific examples of illustrated;

[0031] 图7为本发明实施例副载波调制米勒码解码方法示意图。 [0031] Figure 7 a schematic view of embodiment Miller subcarrier modulated code decoding method embodiment of the present invention.

具体实施方式 detailed description

[0032] 附图1所示,本发明实施例副载波调制米勒码解码装置包括用于记录窄脉冲个数的窄脉冲计数模块102,窄脉冲计数模块102的输入端连接有宽脉冲识别模块101,宽脉冲识别模块101用于识别输入数据中的宽脉冲;窄脉冲计数模块102的输出端连接有解码状态机模块104,解码状态机模块104用于确定解码状态机状态信息。 [0032] 1 shown in the drawings, embodiments of the present invention, the subcarrier modulation Miller code decoding means includes means for recording the number of narrow pulses of narrow pulse counting module 102, a narrow input pulse counting module 102 is connected to the pulse width of the identification module 101, the pulse width of the pulse width of the identification module 101 for identifying the input data; narrow pulse count output of module 102 is connected to the decoding state machine module 104, decoding module 104 for determining a state machine state machine decodes information.

[0033] 解码状态机模块104的输入端连接有条件处理模块103,条件处理模块103用于设置解码状态机模块104的解码条件;解码状态机模块104的输出端连接有解码输出模块105,解码输出模块105用于输出解码数据。 [0033] The input module 104 of the decoder state machine module 103 is connected conditional processing, the conditional processing module 103 for decoding condition setting module 104, a decoding state machine; an output of the decoder state machine module 104 is connected to the output of the decoding module 105, decoding output module 105 for outputting decoded data.

[0034] 带副载波的米勒解码分为三种,分别是M = 2、4、8三种模式,这三种模式对应的判断条件如附图4所示,条件处理模块103根据M值找到对应的三种数据来决定解码条件。 [0034] Miller decoding subcarrier band is divided into three types, namely three modes M = 2,4,8, the three modes corresponding to the determination condition as illustrated in Figure 4, the processing module 103 in accordance with the condition value M found three data corresponding to the determined decoding conditions.

[0035] 附图2和附图3所示,米勒码导引头由相邻不跳变的前导音及数据010111组成,其中前导音可以用来恢复时钟,其长度分为两种,TRext = O时导引头包含4个码元周期前导音(4个码元周期数据O),如附图2所示;TRext = I时导引头包含16个码元周期前导音(16个码元周期数据O),如附图3所示。 [0035] Figures 2 and 3, the Miller code is not seeker by adjacent tone hopping preamble and data 010,111, where tones can be used to recover the clock preamble, the length of which is divided into two, trext = O when the seeker includes four symbol periods preamble tone (4 data symbol periods O), as shown in Figure 2; tRext = I when the seeker includes 16 symbol periods preamble tone (16 yards data symbol period O), as shown in Figure 3. 若起始使用宽脉冲作为计数间隔,就会绕过前导音部分及数据OlOlll中的数据0,直接进入数据10111的解码部分。 If the pulse width used as the starting count interval, it will bypass the preamble data and audio data portion in OlOlll 0, 10111 directly into the data decoding section.

[0036] 附图4所示,副载波调制米勒序列可以看出,副载波米勒解码包括宽脉冲及窄脉冲两种,而宽脉冲出现的位置不固定,不仅在码元中间,也会在码元边沿出现,但是仍有规律可循,当M = 2时,码元包括了2个周期的副载波,即4个所述窄脉冲,宽脉冲间的窄脉冲个数可以依此统计;当M = 4时,码元包括4个周期副载波,以此类推,M = 8时,码元包括8个周期的副载波,因此可统计不同M值下三种不同类型的窄脉冲个数。 [0036] FIG. 4, Miller subcarrier modulation sequence may be seen, the subcarrier Bo Mile decoding includes two kinds of a wide pulse and the narrow pulse, the pulse width position of occurrence is fixed, only the intermediate symbols, also symbol appears in the edge, but there are still rules to follow, when M = 2, the subcarrier symbols comprising two cycles, i.e., the four narrow pulses, number of pulses between the narrow width pulse and so can statistics ; when M = 4, four cycles symbol includes sub-carriers, so, when M = 8, a symbol including subcarriers 8 cycles, it can count at three different types of narrow pulses a different value of M number. 通过宽脉冲间的窄脉冲累加个数进行统计得到附图5所示列表,其中三行分别为M = 2,4,8三档,三列分别代表三种窄脉冲宽度,状态I => 01从数据I到数据O再到数据1,窄脉冲累计个数最多;状态i = > 00/0 =>01即从数据I到数据O再到数据O或者数据O到数据O再到数据I ;状态I = > 1/0 = > O即从数据I到数据I或者从数据O到数据O。 Statistical get a list shown in FIG. 5, where M = 2,4,8, respectively three lines of the third gear, respectively, represent three three narrow pulse width, the state of I => 01 accumulated number of a short pulse width between the pulses O data from the data I to data 1 and then, the number of narrow pulses accumulated up; state i => 00/0 => 01 i.e. to the data from the data I data and then O O O data to the data or data then I O; status I => 1/0 => O data i.e. from I to O data from the data I data or O.

[0037] 附图6所示,选取M = 8为例,对解码状态机的状态信息进行图解,出现的三种状态可以分为数据1,数据O及数据01。 [0037] As shown in Figure 6, selecting M = 8 as an example, status information decoding state machine is illustrated, can be divided into three states occurs 1 data, and data 01 O Data. 出现的数据分别是14、22、30三种,其中14出现在数据I到数据1,或数据O到数据O的变换中;22出现在数据I到数据0,或数据O经过一个数据O到数据I的变换中;30仅出现在数据I经过数据O到数据I的变换中,对应附图5所示状态机的状态信息列表。 Data presented are the three kinds of 14,22,30, 14 present in the data to the data I 1, O, or data in the transformed data O; 22 present in the data I to data 0 or data via a data O to O the transformed data I; 30 I occurs only in the data to the data via the data I O conversion, the state machine corresponding to the status information list shown in Figure 5 of the drawings. 当解码开始时,由于前导音结束为1,起始位置为1,根据转换规则进行跳变并输出相应数据,进行解码,结束后将解码结果返回。 When the decoding starts, since the leading end of the sound is 1, 1 is the start position, the hopping is performed in accordance with the conversion rule and outputs corresponding data, for decoding, a decoding result after the end of return.

[0038] 附图7所示,本发明实施例副载波调制米勒码解码方法示意图,具体流程如下: [0038] 7 shown in the drawings, embodiments of the present invention, the subcarrier modulation schematic Miller code decoding method, the specific process is as follows:

[0039] 701:开始解码; [0039] 701: start the decoding;

[0040] 702:宽脉冲识别模块判断当前输入数据是否为宽脉冲;如果是,进入步骤703,如果否,进入步骤704 ; [0040] 702: pulse width data identification module determines whether the current input pulse width; if yes, proceeds to step 703, if NO, proceeds to step 704;

[0041] 703:计数器值输出,并进入步骤706 ; [0041] 703: output counter value and proceeds to step 706;

[0042] 若当前输入数据为宽脉冲时,则将输出当前计数器值。 [0042] If the current input data is the pulse width, the current counter value is output.

[0043] 704:判断当前输入数据是否为窄脉冲;如果是,进入步骤707 ;如果否,返回步骤701 ; [0043] 704: determining whether the current input data narrow pulse; if yes, proceeds to step 707; if not, returns to step 701;

[0044] 返回步骤701后,等待下一次输入数据。 [0044] After returning to step 701, waiting for the next input data.

[0045] 705:计数值输出后,计时器清零,并返回步骤701 ; [0045] 705: The count value is output, the timer is cleared, and returns to step 701;

[0046] 当找到第一宽脉冲时,计数器开始计数,下一个宽脉冲时结束本次计数,并开始重新计数。 [0046] When finding the first pulse width, the counter starts counting, counts the end of the pulse width of a next, and start counting.

[0047] 706:进入解码状态机判断,判断解码状态机的状态信息; [0047] 706: determining the state machine enters the decoder determines the status information decoding state machine;

[0048] 如果是宽脉冲,则输出计数值,并对计数值进行判断,得到解码状态机状态信息。 [0048] If the pulse width, the count value is output, and the count value is determined to obtain the decoding state machine information.

[0049] 707:窄脉冲计数模块的计数器值加1,并返回步骤701 ; [0049] 707: narrow pulse counting module counter value by 1 and returns to step 701;

[0050] 708:输出解码状态机的状态信息0/1 ; [0050] 708: 0/1 outputs the decoded state information state machine;

[0051] 对输入的计数器值进行判断,起始为1,并在每次解码状态机状态转换后,输出相应的状态信息。 [0051] for the determination of the value of the input counter, starting at 1, and after each decoding state machine state transition, the output corresponding state information.

[0052] 709:判断导引头; [0052] 709: Analyzing seeker;

[0053] 米勒副载波导引头编码规则,导引头包括一段边沿不跳变的数据O及数据010111 ;当找到宽脉冲时,必为数据中的第一个1,因而从此处开始,设定解码状态机初始状态为I。 [0053] Miller subcarrier seeker coding rules, no seeker comprising a length of an edge transition of data and data O 010 111; found when the pulse width, must be a 1 for the first data, and thus from here, decoding state machine is set as the initial state I.

[0054] 若起始为导引头数据,则进入解码数据输出状态。 [0054] When the starting data for the seeker, the decoded data into the output state.

[0055] 710:输出解码数据,并完成解码。 [0055] 710: outputting decoded data, and decoding is completed.

[0056] 解码数据输出,并根据解码长度判断解码是否结束。 [0056] outputs the decoded data, and determines whether to end the decoding according to a decoding length.

[0057] 这里强调下,本发明技术方案,主要应用于UHF RFID读写器。 The [0057] emphasized here, aspect of the present invention, mainly applied UHF RFID reader.

[0058] 本发明还有多种实施方式,但凡在本发明的精神和实质范围内,所作的任何改变、等同替换、改进,均在本发明的保护范围之内。 [0058] There are various embodiments of the present invention, provided that any changes within the spirit and scope of the spirit of the present invention, equivalent replacement, improvement, are within the scope of the present invention.

Claims (8)

  1. 1.一种副载波调制米勒码解码装置,其特征在于,包括用于记录窄脉冲个数的窄脉冲计数模块,所述窄脉冲计数模块的输入端连接有宽脉冲识别模块,所述宽脉冲识别模块用于识别输入数据中的宽脉冲;所述窄脉冲计数模块的输出端连接有解码状态机模块,所述解码状态机模块用于确定解码状态机状态信息。 A Miller subcarrier modulation code decoding apparatus, characterized by comprising means for recording the number of narrow pulses of narrow pulse counting module, of the narrow pulse count module inputs connected to the pulse width of the identification module, the width pulse identification means for identifying the pulse width of the input data; the narrow pulse counting module connected to the output module has a decoding state machine, a state machine means for decoding the decoding state machine to determine the status information.
  2. 2.如权利要求1所述的副载波调制米勒码解码装置,其特征在于,所述解码状态机模块的输入端连接有条件处理模块,所述条件处理模块用于设置所述解码状态机模块的解码条件。 2. The sub-carrier modulation according to claim 1 Miller code decoding means, wherein said state machine decodes the input terminal of the module connected conditional processing module, said processing condition setting means for decoding said state machine conditions decoding module.
  3. 3.如权利要求1所述的副载波调制米勒码解码装置,其特征在于,所述解码状态机模块的输出端连接有解码输出模块,所述解码输出模块用于输出解码数据。 Subcarriers according to claim 1 Miller modulation code decoding means, wherein, said state machine module decoded output terminal is connected to the output of the decoding module, the decoded output means for outputting decoded data.
  4. 4.一种副载波调制米勒码解码方法,其特征在于,判断输入数据是宽脉冲,还是窄脉冲; 如果是窄脉冲,计数器的计数值加I ; 如果是宽脉冲,则输出计数值,并对计数值进行判断,得到解码状态机状态信息; 根据解码状态机状态信息进行判定,若起始为导弓I头数据,则输出解码数据。 4. A subcarrier modulation Miller code decoding method, characterized in that the pulse width of the input data is determined, or narrow pulse; if narrow pulse, the count value of the counter plus I; if the pulse width, the count value is output, and the count value is determined to obtain the decoding state information state machine; determines the state machine based on the decoding state information, if the starting head is turned bow I data, the output decoded data.
  5. 5.如权利要求4所述的副载波调制米勒码解码方法,其特征在于,当找到第一个宽脉冲时开始计数,到下一个宽脉冲时本次计数结束,并开始重新计数。 5. A subcarrier modulation as claimed in claim Miller code decoding method, wherein, when the first to find a pulse width start counting, to the lower end of this counting a pulse width, and resumes counting.
  6. 6.如权利要求4所述的副载波调制米勒码解码方法,其特征在于,所述导引头数据包括4个码元周期数据O和数据010111。 4 according to subcarrier as claimed in claim Miller modulation code decoding method, characterized in that the guide head 4 comprises a data symbol periods and data 010111 O data.
  7. 7.如权利要求4所述的副载波调制米勒码解码方法,其特征在于,所述导引头数据包括8个码元周期数据O和数据010111。 7. The sub-carrier modulation according to claim 4, wherein the Miller code decoding method, characterized in that the guide head comprises eight data symbols and data periods 010 111 O data.
  8. 8.如权利要求4所述的副载波调制米勒码解码方法,其特征在于,根据解码长度判断解码是否结束。 8. The sub-carrier modulation according to claim 4, wherein the Miller code decoding method, comprising determining whether to end the decoding according to a decoding length.
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