CN101202564A - Channel initialization method - Google Patents

Channel initialization method Download PDF

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CN101202564A
CN101202564A CN 200710178303 CN200710178303A CN101202564A CN 101202564 A CN101202564 A CN 101202564A CN 200710178303 CN200710178303 CN 200710178303 CN 200710178303 A CN200710178303 A CN 200710178303A CN 101202564 A CN101202564 A CN 101202564A
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modem
sequence
training sequence
channel
training
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CN 200710178303
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CN101202564B (en
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伍瑞卿
涛 卢
艺 张
张菊茜
群 李
伟 陈
顾庆水
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中国海洋石油总公司;中海油田服务股份有限公司
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Abstract

A channel initialization method includes the following steps: A1) a ground end modem and an underground end modem respectively send a first training sequence to each other; B1) the modem received the first training sequence finishes the training of channel activation, multi-carrier clock synchronization, multi-carrier symbol synchronization, multi-carrier frame synchronization, AGC parameter arrangement, transmission power adjustment, time-domain equalizer and frequency-domain equalizer; C1) the ground end modem and the underground end modem respectively send a second training sequence to each other; D1) the modem received the second training sequence carries out subchannel SNR estimation to the training sequence and carries out bit and energy distribution to each subchannel according to the estimated SNR value; E1) the ground end modem and the underground end modem respectively send a subchannel bit distribution information and a subchannel energy distribution information to each other.

Description

一种信道初始化方法 A channel initialization method

技术领域 FIELD

本发明涉及一种信道初始化方法,尤其涉及一种用于测井电缆的信道初始化方法。 The present invention relates to a method for initializing a channel, and particularly to a method for initializing a channel logging cable.

背景技术 Background technique

测井系统通常包括地面设备(地面端设备)和井下仪器(井下端设备) 两部分,地面设备和井下仪器通过测井电缆相连。 Logging system typically comprises a ground equipment (ground side apparatus) and downhole equipment (downhole end of the device) in two parts, connected to surface equipment and downhole equipment through the logging cable. 井下仪器需要将采集得到 Downhole tools you need to collect to get

的数据通过测井电缆传输到地面设备;而地面设备也需要将控制指令等数据传输到井下仪器。 The data transmitted through the logging cable to the surface equipment; surface equipment and also need to transfer data and control commands to the downhole tools.

测井作业始于20世纪二十年代~三十年代,测井系统经历了从;漠拟到数字的发展。 Logging operation began in the 1920s - the thirties, has gone from logging system; desert intends to develop a number. 目前已经发展到了第五代成像测井阶段。 It has now developed to the fifth generation of imaging logging stage. 随着测井仪器的发展, 对数据传输速率的需求也逐渐提高。 With the development of logging tools, the demand for data transmission rate is gradually increased.

为了满足对数据传输速率不断提高的需求,大量的研究人员对测井传输技术进行研究。 In order to meet the data transfer rates continue to increase demand, a large number of researchers logging transmission technology research. 六十年代以前基本上采用调频、调幅等模拟调制方式传输模拟量,传输的数据量很少,传输速率也很低。 Using essentially the analog transmission analog FM modulation, amplitude modulation before the sixties, the small amount of data transmitted, the transmission rate is low. 八十年代,测井传输技术开始大量采用数字调制方式,但是数据传输速率仍然无法满足需求。 Eighties, began a large number of logging transmission technology using digital modulation scheme, but the data transfer rate is still unable to meet demand.

例如,阿特拉斯公司在八十年代中期研制成代号为3502的PCM (Pulse Code Modulation,脉冲编码调制)调制器,传输速率仅为7.5 kbps。 For example, in the mid-eighties Atlas code is developed into a PCM 3502 (Pulse Code Modulation, Pulse Code Modulation) modulator, a transmission rate is only 7.5 kbps. 之后, 该公司的调制解调技术开始采用曼彻斯特编码方式,传输速率提高到93.35 kbps (型号为WTC3510)。 Thereafter, the modem technology companies began using the Manchester encoding method, increase the transmission rate to 93.35 kbps (model WTC3510).

斯伦贝谢公司一直采用相移键控(Phase Shift Keying,简称PSK)调制方式传输数据。 Schlumberger been using phase shift keying (Phase Shift Keying, referred to as PSK) modulation scheme for transmitting data. 八十年代中期以前,研制出CCS和CTS两种型号的数字传输短节,其中CCS的传输速率为80kbps, CTS的传输速率为100kbps。 Before the mid-eighties, CCS and CTS developed two models of digital transmission short section, where the transmission rate CCS is 80kbps, CTS transmission rate is 100kbps. CCS 与CTS均采用BPSK (Binary Phase Shift Keying, 二进制相移键控)调制技 CCS and CTS are used BPSK (Binary Phase Shift Keying, Binary Phase Shift Keying) modulation techniques

术。 Surgery. 九十年代初研制出型号为MAX-500的成像测井系统,"MAX-500"中的"500"代表它的遥传系统数据上行传输速率可达500kb/s。 Developed a model for the early nineties MAX-500 imaging logging system, "MAX-500" in "500" represents that the uplink telemetry system data transfer rate up to 500kb / s. 斯伦贝谢公司的遥传系统称为DTS数字遥传系统,采用QAM (Quadrature Amplitude Modulation,正交幅度调制)技术,可达到500kbps的数据传输速率,基本上能够满足成像测仪器信息量传输的需要。 Schlumberger telemetry system called DTS digital telemetry system using QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) technique, can achieve a data transfer rate of 500kbps, the test meter can basically meet the imaging information transmitted need. 在哈里伯顿公司推出的成像测井系统EXCELL-2000中,其遥传系统(型号为DITS )采用调制的二进制码传输,上传速率为217.6kbps。 In Release imaging Halliburton Logging EXCELL-2000 system in which telemetry system (model of DITS) modulated binary code transmission, uploading rate of 217.6kbps. 贝克-阿特拉斯公司推出的型号为ECLIPS-2000 的成像测井系统中,其遥传系统(型号为WTC)采用曼彻斯特码传输,上传速率为230kbps。 Baker - Model Atlas launch ECLIPS-2000 imaging logging system in which telemetry system (Model WTC) using Manchester code transmission, uploading rate is 230kbps.

但是,随着现代测井系统的实时性要求越来越高,地面设备和井下仪器之间需要传输的数据量越来越多,现在的测井系统的传输速率已无法满足要求。 However, with the real-time requirements of modern logging system is getting higher and higher, the amount of data to be transferred between surface equipment and downhole tools more and more, the transfer rate is now logging system has been unable to meet the requirements.

发明内容 SUMMARY

本发明所要解决的技术问题是,克服现有技术的不足,提出一种用于测井电缆的高速率的信道初始化方法。 The present invention solves the technical problem, overcoming the disadvantages of the prior art, a method is proposed to initialize the channel a high rate for logging cable.

为了解决上述问题,本发明提供一种信道初始化方法,应用于包含通过测井电缆相连的地面端和井下端的测井通信系统中,其特征在于,该方法包含如下步骤: To solve the above problems, the present invention provides a method for initializing a channel, it is applied to the ground terminal and comprising a downhole end of the wireline logging via a communication system is connected, which is characterized in that the method comprises the steps of:

Al )地面端调制解调器和井下端调制解调器分别向对方发送第一训练序列; Al) and the ground terminal of the modem downhole end a first modem training sequences are transmitted to the other;

B1 )接收到第一训练序列的调制解调器完成信道激活、多载波时钟同步、 多载波符号同步、多载波帧同步、AGC参数设置、发送功率调整、时域均衡器和频域均衡器的训练; B1) a first received training sequence to modem channel activation is completed, the multi-carrier clock synchronization, symbol synchronization of multi-carrier, multi-carrier frame synchronization, the AGC parameter, the transmission power adjustment, the training time domain equalizer and frequency domain equalizer;

CI )地面端调制解调器和井下端调制解调器分别向对方发送第二训练序 CI) and a ground terminal of the modem downhole end modem training sequence are transmitted to the other second

列; Columns;

Dl)接收到第二训练序列的调制解调器该训练序列进行子信道SNR估计,根据估计得到的SNR值对每一子信道进行比特及能量分配;El )地面端调制解调器和井下端调制解调器分别向对方发送子信道比特分配信息和子信道能量分配信息。 DL) receives a modem training sequence of the second training sequence subchannel SNR estimation, the estimated SNR values ​​allocated according to each subchannel and bit energy; El) ground terminal modem and the modem are transmitted downhole end to the other sub- channel bit subchannel allocation information and the energy allocation information.

此外,在所述步骤B1)和C1)之间还包含如下步骤:地面端调制解调器和井下端调制解调器分别向对方发送第一ACK序列; Further, between the step B1) and C1) further comprises the steps of: ground side modem and the modem are transmitted downhole end to the other first ACK sequence;

在所述步骤D1)和E1 )之间还包含如下步骤:地面端调制解调器和井下端调制解调器分别向对方发送第二ACK序列。 Between said step D1) and E1) further comprises the steps of: ground side modem and the modem downhole end of the second ACK sequence are transmitted to the other party.

此外,所述第一训练序列和第二训练序列对应的信号由PRBS进行BPSK调制而成,BPSK星座的映射规则为1, 0+ + 1; PRBS的生成多项式为:x8 + x6 + x5 + x4 + l;所述第二训练序列与第一训练序列具有不同的相位。 In addition, the first training sequence and a second training sequence by the PRBS signal corresponding to BPSK modulation, the BPSK constellation mapping rule is 1, 0+ + 1; PRBS generating polynomial is: x8 + x6 + x5 + x4 + l; the second training sequence with a first training sequence having a different phase.

此外,所述第一ACK序列和第二ACK序列对应的信号由PRBS进行BPSK调制而成,BPSK星座的映射规则为1, 0》+ l; PRBS的生成多项式为:;c8+;c6+;c5+x4+l;所述第一ACK序列、第二ACK序列与所述第一训练序列和第二训练序列具有不同的相位。 Furthermore, the first ACK sequence and the second sequence corresponding to the ACK signal by the PRBS BPSK modulation, the BPSK constellation mapping rule is 1, 0 "+ l; PRBS generator polynomial is:; c8 +; c6 +; c5 + x4 + l; the first ACK sequence, the second sequence with the first training ACK sequence and the second training sequences have different phases.

综上所述,采用本发明基于OFDM的数据发送、接收方法及装置,以及相应的信道初始化方法,在现有的测井电缆上大幅提高了数据传输速率, 满足了井下仪器的大数据量的传输要求。 In summary, the use of a large amount of data OFDM-based data transmission method and a receiving apparatus, and the corresponding channel initialization method, in the conventional wireline significantly increased data transfer rate to meet the downhole tool of the present invention. transmission requirements.

附图说明 BRIEF DESCRIPTION

图l是采用本发明信道初始化和数据传输方法的测井系统结构示意图; Figure l is a schematic view of a logging system using the channel initialization and configuration data transmission method of the present invention;

图2是根据测井电缆所对应的OFDM基本参数进行信道划分的示意图; FIG 2 is a schematic view of a channel according to the divided OFDM basic parameters corresponding to the wireline;

图3是本发明实施例用于测井电缆的信道初始化方法流程图; FIG 3 is a channel initialization method for the wireline embodiment of the present invention, a flow chart of embodiment;

图4是本发明实施例数据发送装置中的调制器的系统结构示意图; FIG 4 is a diagram showing a system configuration example of a data transmission modulator device of the embodiment of the present invention;

图5是本发明实施例数据传输方法中的调制方法的流程图; FIG 5 is a flowchart of a modulation method for data transmission in the embodiment of the method of the present invention;

图6是使用本发明实施例数据发送方法所形成的超帧结构示意图; FIG 6 is a schematic diagram of a superframe structure used in Example data transmission method of the embodiment of the present invention is formed;

图7是本发明实施例数据发送装置中的解调器的系统结构示意图; FIG 7 is a diagram of a system configuration example of a data transmission apparatus in the present invention, a demodulator of the embodiment;

图8是本发明实施例数据传输解调方法的流程图。 FIG 8 is a flowchart of a data transmission embodiment of the demodulating method of the present invention.

具体实施方式 Detailed ways

本发明的基本思路是,为了提高数据传输速率,将多载波技术,尤其是OFDM (Orthogonal Frequency Division Multiplexing,正交频分复用)技术应用于测井电缆的数据传输。 The basic idea of ​​the invention is to improve data transmission rate, multi-carrier techniques, in particular OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) data transmission technology is applied to the logging cable.

多载波技术就是通过频谱交叠的频分复用(FDM )等技术实现并行数据传输和多信道数据传输,以提高数据的传输速率。 It is to realize the multi-carrier technology and multi-channel parallel data transmission by the data transmission spectrum overlapping frequency division multiplexing (FDM) technology to increase data transmission rate. 其中,通常釆用离散傅立叶变换(DFT)来实现FDM方案。 Wherein, generally preclude the use of discrete Fourier transform (DFT) to implement FDM scheme.

在各种FDM技术中,基于多载波方案的OFDM技术是通信技术领域最有发展前景的调制解调技术之一。 In various FDM technique, multiple carrier scheme based on OFDM technology is one of communication technologies most promising modem technology. OFDM将速率很高的信息码流分成许多低速码流,在一组正交的子信道上进行并行传输。 OFDM divides the information stream at a high rate stream into a plurality of low-speed, parallel transmission over a set of orthogonal subchannel. 采用OFDM技术可以扩展子信道传输符号的宽度,从而大大简化接收机中均衡器的设计。 Using OFDM technology can extend the width of the sub-transmission symbols, which greatly simplifies the design of an equalizer in the receiver. 同时OFDM 技术采用时间保护间隔(简称TGI)有效地去除符号间干扰(简称ISI), 克服了小于TGI的信道时延扩展。 Meanwhile OFDM technology uses guard interval (referred to as TGI) to effectively remove inter-symbol interference (referred to as ISI), to overcome the less than TGI channel delay spread. 另一方面,利用子载波间的正交性,OFDM 技术有效地提高了频谱利用率。 On the other hand, the use of the orthogonality between sub-carriers, the OFDM technique effectively improve the spectrum utilization. 与传统的单载波技术相比,OFDM具有较高的频语利用率,其频谱利用率随着子信道数目的增加而趋近Nyquist (奈奎斯特)极限,并且可以根据每个子信道的传输条件进行自适应的比特和能量(功率)分配,以充分利用信道容量,提高传输速率。 Compared with conventional single carrier technology, the OFDM has high frequency utilization language, its spectral efficiency as the number of subchannels increases approaching the Nyquist (Nyquist) limit, and may be transmitted according to each sub-channel and adaptive bit energy condition (power) distribution, to take advantage of channel capacity, increase the transmission rate.

下面将结合附图和实施例对本发明进行详细描述。 The present invention will now be described in detail in conjunction with the accompanying drawings and embodiments.

图1是采用本发明信道初始化和数据传输方法的测井系统结构示意图。 1 is a schematic system configuration of channel initialization logging and data transmission method of the present invention is employed. 如图l所示,该系统包含:地面端,井下端,和连接地面端与井下端的测井电缆。 As shown in FIG. L, the system comprising: a ground terminal, a downhole end, and a ground terminal connected to the wireline downhole end.

地面端包含:地面终端,地面终端接口, COFDM (Coded Orthogonal Frequency Division Multiplexing,编码正交频分多路复用)调制器B, COFDM 解调器B,地面电缆接口。 Ground terminal comprising: a ground terminal, the ground terminal interface, COFDM (Coded Orthogonal Frequency Division Multiplexing, coded orthogonal frequency division multiplexing) modulator B, COFDM demodulator B, terrestrial cable connections.

井下端包含:井下仪器,井下仪器接口, COFDM调制器A, COFDM Downhole end comprising: a downhole tool, a downhole instrument interface, COFDM modulator A, COFDM

解调器A,井下电缆接口。 A demodulator A, downhole cable connector.

地面终端通过地面终端接口与COFDM调制器B和COFDM解调器B 相连,发送和接收数据。 Ground terminals are connected through the ground terminal interface with COFDM modulation COFDM demodulator B and B, send and receive data.

COFDM调制器B从地面终端接口接收待发送数据,调制后通过地面电缆接口承载在测井电缆上发送至井下端。 COFDM modulator B from the ground terminal interface receives data to be transmitted, modulated carrier is transmitted to an interface on the downhole end of a logging cable through the ground cable.

的数据,经过解调后通过地面终端接口发送给地面终端。 Data after demodulated by the terrestrial terminal interface to a ground terminal.

COFDM调制器B和COFDM解调器B可直接进行数据交互。 COFDM modulation COFDM demodulator B and B can directly exchange data. 可以将COFDM调制器B和COFDM解调器B合并称为COFDM调制解调器B。 COFDM modulation COFDM demodulator B and B may be referred to as a combined modem B. COFDM

井下仪器通过井下仪器接口与COFDM调制器A和COFDM解调器A 相连,发送和接收数据。 Downhole tool is connected to downhole interface COFDM modulator A COFDM demodulator and A, to send and receive data.

COFDM调制器A从井下仪器接口接收待发送数据,调制后通过井下电缆接口承载在测井电缆上发送至地面端。 COFDM modulator A downhole tool from the interface receives data to be transmitted, modulated carrier is transmitted to the interface end in the ground downhole wireline cable.

COFDM解调器A通过井下电缆接口接收地面端承载在测井电缆上发送的数据,经过解调后通过井下仪器接口发送给井下仪器。 A COFDM demodulator bearer data transmitted over a cable interface downhole logging cable receiving surface side, after demodulation by the downhole tool to a downhole instrument interface.

同样,COFDM调制器A和COFDM解调器A可直接进行数据交互。 Similarly, COFDM modulator A and A COFDM demodulator can directly exchange data. 也可以将COFDM调制器A和COFDM解调器A合并称为COFDM调制解调器A。 Also COFDM modulator A COFDM demodulator and A may be referred to as a combined modem A. COFDM

测井电缆通常釆用铠装测井电缆。 Generally preclude the use of wireline logging cable armor. 本发明实施例基于OFDM的数据传输方法所使用的部分OFDM系统参数根据铠装测井电缆信道的传输特性确定。 Embodiments of the present invention, part of the OFDM system parameters of the OFDM data transmission method is used is determined based on the transfer characteristics armored logging cable channel.

以7000米铠装测井电缆为例,根据电缆信道的传输特性可确定以下OFDM基本参数: To 7000 m armored logging cable, for example, may be determined according to the transmission characteristics of the cable channel OFDM following basic parameters:

>子信道间隔:1.220703125 kHz。 > Subchannel interval: 1.220703125 kHz.

>子信道总数和FFT处理点数:256;从直流分量开始依次编号为0, 1,……,255。 > FFT processing points and the total number of subchannels: 256; starting from the DC component are numbered 0, 1, ......, 255.

>可用子信道总数:202个,其中, > Total number of available subchannels: 202, wherein

上行信道(Up Link,井下到地面)包含的可用子信道总数:195个; Total number of available subchannels upstream channel (Up Link, downhole to the surface) contains: 195;

下行信道(Down Link,地面到井下)包含的可用子信道总数:7个。 Total number of available subchannels of the downlink channel (Down Link, ground downhole) contains: 7.

>有效符号时间:819.2us > Effective symbol time: 819.2us

>保护间隔时间:204.8us (即:OFDM符号长度的1/4) > Protection interval: 204.8us (i.e.: OFDM symbol length 1/4)

>FFT处理带宽:312.5 kHz > FFT processing bandwidth: 312.5 kHz

在铠装测井电缆上,根据上述OFDM基本参数进行信道划分。 On armored logging cable, for OFDM channel is divided based on the basic parameters. 图2是根据测井电缆所对应的OFDM基本参数进行信道划分的示意图。 FIG 2 is a schematic view of a channel according to the divided OFDM basic parameters corresponding to the logging cable. 如图2所示, as shown in picture 2,

子载波0-子载波5:作为保留子载波(不使用)。 0- 5 subcarriers of subcarriers: (not used) as a reserved subcarrier. 不使用子载波0〜 子载波5的原因是避免低频端的交流供电干扰; Reason not to use the subcarriers of subcarriers 0~ 5 is to avoid the low frequency AC power supply interference;

子载波6-子载波12:作为下行信道(地面端设备至井下端设备); 6- 12 subcarriers of subcarriers: a downlink channel (the ground side apparatus to the downhole end of the device);

子载波13〜子载波26:作为保留子载波(不使用),起到将下行信道和上行信道隔离的作用; 13~ 26 subcarriers of subcarriers: subcarriers are reserved (not used), functions of the downlink channel and the uplink channel isolation effect;

子载波27〜子载波221:作为上行信道(井下端设备至地面端设备); 其中,子载波36为导频子信道,其余为上行业务子信道。 Subcarriers 221 subcarrier 27~: as an uplink channel (downhole end of the device to the ground terminal apparatus); wherein a pilot subcarrier 36 subchannels, the remaining uplink traffic subchannels.

上述导频子信道上传输的导频信号为一正弦波,用于发送端和接收端之间进行时钟同步。 The above-described pilot subchannel transmitted pilot signal is a sine wave, for performing clock synchronization between a transmitting end and a receiving end.

本发明的数据传输方法分为:信道初始化阶段和数据传输阶段。 The data transmission method according to the invention is divided into: channel initialization phase and data transfer phase.

在信道初始化阶段需要完成:通信链路建立、发送功率控制、接收AGC 参数、时钟同步、符号同步、帧同步、时域均衡器训练、频域均衡器训练、 子信道性能估计、子信道比特分配和能量分配等操作。 Complete channel initialization phase: a communication link is established, transmission power control, reception AGC parameter, clock synchronization, symbol synchronization, frame synchronization, equalizer training time domain, frequency domain equalizer training, performance estimates subchannel, subchannel bit allocation energy distribution and other operations.

图3是本发明实施例用于测井电缆的信道初始化方法流程图。 FIG 3 is a channel initialization method for the wireline embodiment of the present invention embodiment of a flow chart. 如图3所示,该方法包含如下步骤: 3, the method comprising the steps of:

101: COFDM调制器A向COFDM调制解调器B发送训练序列0; 101: COFDM COFDM modulator A modem sends a training sequence B 0;

训练序列0对应的信号由PRBS (伪随^L二进制序列)进行BPSK调制而成,BPSK星座的映射规则为1^-1, 0^ + 1。 0 corresponding to the training sequence signal by the PRBS (pseudo random binary sequence ^ L) BPSK modulation, the BPSK constellation mapping rule 1 is -1, 0 + ^ 1. PRBS的生成多项式为:x8 + x6 + x5 + x4 +1 。 The PRBS generator polynomial is: x8 + x6 + x5 + x4 +1.

训练序列o可以使用上行信道的所有子信道进行发送,也可以使用一个或多个子信道进行发送。 O training sequence can be used for all subchannels of the uplink channel transmission may be used to transmit one or more subchannels. 使用多个子信道发送训练序列0可以增加时钟同步、均衡器训练的精确度。 0 transmitted training sequence using a plurality of subchannels may increase the clock synchronization accuracy of the equalizer training.

102: COFDM调制解调器B接收到训练序列0后,完成信道激活、多载波时钟同步、多载波符号同步、多载波帧同步、AGC参数设置、发送功率调整、时域均衡器和频域均衡器的训练。 102: After COFDM modem B receives the training sequence 0, complete channel activation, multi-carrier clock synchronization, a multi-carrier symbol synchronization, a multi-carrier frame synchronization, the AGC parameter, the transmission power adjustment, a time domain equalizer and frequency domain equalizer training .

通过AGC参数设置,COFDM解调器B将AGC控制在最佳接收电平; 通过多载波符号同步,COFDM解调器B将FFT窗调整到最佳位置,使接收信号没有子信道间千扰;通过时域均衡器和频域均衡器的训练,COFDM解调器B获得时域和频域均衡器的均衡系数,为后续的训练序列和数据传输做好准备。 By setting the AGC parameter, the COFDM demodulator B AGC control in the best reception level; synchronized by multicarrier symbols, COFDM demodulator B adjusted to the optimum position of the FFT window, the reception signal is not one thousand interference between subchannels; by training a time domain equalizer and frequency domain equalizer, the COFDM demodulator B equalization coefficients obtained time domain and frequency domain equalizer, to prepare for the training sequence and the subsequent data transmission.

通过计算信道衰减,COFDM调制器B进行功率调整,使发送功率达到最佳状态。 Calculated channel attenuation, B COFDM modulator adjusting the power, the transmission power to achieve the best.

103: COFDM调制器B向COFDM调制解调器A发送训练序列0; 训练序列0的生成方法与步骤101中的相同。 103: COFDM modulator B COFDM transmission modem training sequence 0 to A; the same training sequence generator 101 is 0 and the method step.

同样,训练序列O可以使用下行信道的所有的子信道进行发送,也可以使用下行信道的一个或多个子信道进行发送。 Similarly, the training sequence may be used for all subchannels O downlink channel is transmitted, may be used one or more subchannels of the downlink channel is transmitted.

104: COFDM调制解调器A接收到训练序列0后,完成信道激活、多载波时钟同步、多栽波符号同步、多载波帧同步、AGC参数设置、信道响应估计、发送功率调整、时域均衡器和频域均衡器的训练。 104: After COFDM modem A receives the training sequence 0, complete channel activation, multi-carrier clock synchronization, a multi-planted wave symbol synchronization, a multi-carrier frame synchronization, the AGC parameter, the channel response estimation, transmit power adjustment, the time domain equalizer and frequency training domain equalizer.

通过AGC参数设置,COFDM解调器A将AGC控制在最佳接收电平; 通过多载波符号同步,COFDM解调器A将FFT窗调整到最佳位置,使接收 By setting parameters AGC, the AGC A COFDM demodulator control in the best reception level; synchronized by multicarrier symbols, A COFDM demodulator FFT window is adjusted to the optimum position, the reception

信号没有子信道间干扰;通过时域均衡器和频域均衡器的训练,COFDM解调器A获得时域和频域均衡器的均衡系数,为后续的训练序列和数据传输做好准备。 No inter-subchannel interference signal; training through a time domain equalizer and frequency domain equalizer, A COFDM demodulator equalization coefficients obtained time domain and frequency domain equalizer, to prepare for the training sequence and the subsequent data transmission.

通过信道响应估计,计算信道衰减,COFDM调制器A进行功率调整, 使发送功率达到最佳状态。 The channel response estimate calculated channel attenuation, COFDM modulator A power adjustment, the transmission power to achieve the best.

105: COFDM调制解调器A向COFDM调制解调器B发送ACK (ACKnowledgement ,确认应答)序列0 ; 105: COFDM COFDM sends modem A modem B ACK (ACKnowledgement, acknowledgment) sequence 0;

通过发送ACK序列0, COFDM调制解调器B获知COFDM调制解调器A已完成训练序列0的接收和相应的设置,可以进入下一阶段。 0 sequence by sending an ACK, known COFDM COFDM modem A modem B has been completed and the corresponding received training sequence set to 0, go to the next stage.

ACK序列0的生成原理与训练序列0相同,只是比训练序列O延迟一个比特,以使其相位与训练序列0不同。 ACK sequence generation principle and the same training sequence 0, 0, O training sequence than just one bit delay, so as to phase the training sequence different from 0.

106: COFDM调制解调器B向COFDM调制解调器A发送ACK序列0; 106: COFDM modem B transmits an ACK sequence COFDM 0 to modem A;

通过发送ACK序列0, COFDM调制解调器A获知COFDM调制解调器B已完成训练序列0的接收和相应的设置,可以进入下一阶段。 0 sequence by sending an ACK, known COFDM COFDM modem A modem B has been completed and the corresponding received training sequence set to 0, go to the next stage.

ACK序列0的生成方法与步骤105中相同。 A method of generating ACK sequence 0 in step 105 the same.

107: COFDM调制器A向COFDM调制解调器B发送训练序列1; 训练序列1在上行信道的所有的子信道发送。 107: COFDM COFDM modulator A modem sends a training sequence B 1; 1 a training sequence transmitted in all subchannels of the uplink channel.

训练序列1的生成原理与训练序列0相同,只是比训练序列0延迟2个比特,以使其相位与训练序列0和ACK序列0不同。 The principle of generating a training sequence and the same training sequence 0, but more than 0 training sequence delayed by two bits, so the phase of the training sequence and ACK sequence different 0 0.

108: COFDM调制解调器B接收到训练序列1后,根据该训练序列进行子信道SNR ( Signal to Noise Ratio,信噪比)估计,根据估计得到的SNR 值对每一子信道进行比特及能量分配。 108: COFDM modem B receives a training sequence, a subchannel SNR (Signal to Noise Ratio, SNR) estimate based on the training sequence, the SNR value based on the estimated for each subchannel and bit energy distribution.

在后续的数据传输阶段将根据上述子信道比特及能量分配结果确定每个子信道用什么星座进行调制,以及每个子信道用多大的功率进行发送。 In a subsequent data transfer phase will be determined for each subchannel modulation, and what each subchannel constellation how much transmission power based on the sub-channel bit and power allocation result.

本实施例中,每个子信道比特分配的范围:0~10bits。 In this embodiment, each subchannel bit allocation range: 0 ~ 10bits.

109: COFDM调制器B向COFDM调制解调器A发送训练序列1; 109: COFDM COFDM modulator B sends A modem training sequence;

训练序列1在下行信道的所有的子信道发送。 A training sequence transmitted in all subchannels of the downlink channel. 训练序列1的生成方法与 The method of generating a training sequence and

步骤107相同。 Same as step 107.

110: COFDM调制解调器A接收到训练序列1后,根据该训练序列进行子信道SNR估计,根据估计得到的SNR值对每一子信道进行比特及能量分配。 110: COFDM modem receives the A 1, the sub-channel based on the SNR estimation training sequence is the training sequence, based on the estimated SNR value for each subchannel and bit energy distribution.

同样,在后续的数据传输阶段将根据上述子信道比特及能量分配结果确定每个子信道用什么星座进行调制,以及每个子信道用多大的功率进行发送。 Similarly, the subsequent data transmission phase for each subchannel to determine the modulation, and what each subchannel constellation how much transmission power based on the sub-channel bit and power allocation result.

111: COFDM调制解调器A向COFDM调制解调器B发送ACK序列1; 111: COFDM COFDM modem A to modem B transmits ACK sequence;

通过发送ACK序列1, COFDM调制解调器B获知COFDM调制解调器A已完成训练序列1的接收和相应的设置,可以进入下一阶段。 By sending an ACK sequence, known COFDM COFDM modem A modem B has been completed and the corresponding received training sequence set to be the next stage.

本步骤中的ACK序列1与ACK序列0相同。 In this step, the ACK sequence is identical to a sequence ACK 0.

112: COFDM调制解调器B向COFDM调制解调器A发送ACK序列1; 112: COFDM COFDM modem B to modem A transmits ACK sequence;

通过发送ACK序列1, COFDM调制解调器A获知COFDM调制解调器B已完成训练序列1的接收和相应的设置,可以进入下一阶段。 By sending an ACK sequence, the modem A known COFDM COFDM modem B has been completed and the corresponding received training sequence set to be the next stage.

本步骤中的ACK序列1与ACK序列O相同。 In this step, the ACK sequence is identical to a sequence ACK O.

113: COFDM调制解调器A向COFDM调制解调器B发送系统信息; 上述系统信息包含:子信道比特分配信息和子信道能量分配信息。 113: COFDM COFDM modem A to modem B transmits information system; and the system information comprises: a sub-channel bit allocation information and the energy allocation information subchannel. 系统信息采用QPSK调制方式,使用上行信道的一个或多个子信道发送。 The system uses QPSK modulation mode information using an uplink channel transmits one or more subchannels.

在本实施例中,系统信息使用上行信道的最低频率(信道条件好)的4 个子信道发送,以提高可靠性。 In the present embodiment, the lowest frequency of the system information using an uplink channel (channel condition is good) of 4 subchannels transmitted, to improve reliability.

114: COFDM调制解调器B向COFDM调制解调器A发送系统信息; 114: COFDM system information to the modem B COFDM modem A;

同样,上述系统信息包含:子信道比特分配信息和子信道能量分配信息。 Also, the above system information comprises: a sub-channel bit allocation information and the energy allocation information subchannel.

系统信息釆用QPSK调制方式,使用下行信道的一个或多个子信道发送。 Systems preclude the use of QPSK modulation information, a downlink channel transmitted using one or more subchannels.

在本实施例中,系统信息使用下行信道的最低频率(信道条件好)的4个子信道发送,以提高可靠性。 In the present embodiment, a downlink system information using the lowest frequency channel (good channel condition) of the transmission 4 subchannels, to improve reliability.

115: COFDM调制解调器A向COFDM调制解调器B发送ACK序列2; 115: COFDM COFDM modem A to modem B transmits ACK sequence 2;

通过发送ACK序列2, COFDM调制解调器B获知COFDM调制解调器A已完成系统信息的接收和相应的设置,可以进入数据传输阶段。 2 by sending an ACK sequence, the modem B is known COFDM COFDM modem A reception has been completed and the corresponding set of system information, may enter a data transfer phase.

ACK序列2与ACK序列O相同。 ACK sequence 2 O and the same ACK sequence.

116: COFDM调制解调器B向COFDM调制解调器A发送ACK序列2; 116: COFDM COFDM modem B to modem A transmits ACK sequence 2;

通过发送ACK序列2, COFDM调制解调器A获知COFDM调制解调器B已完成系统信息的接收和相应的设置,可以进入数据传输阶段。 2 by sending an ACK sequence, the modem A known COFDM COFDM receiver and modem B has completed setting the appropriate system information, you may enter a data transfer phase.

ACK序列2与ACK序列0相同。 Sequence ACK ACK sequence 0 to 2 identical.

由上可知,本发明的通过2个训练序列的发送完成各通信参数的设置; 也就是说,参数的设置分两个阶段进行,第二阶段的参数设置可以参考第一阶段的参数设置结果。 From the above, the present invention performs setting of communication parameters by each of the two transmitted training sequences; that is, set the parameters of the two phases, the second phase parameters may be reference parameters of the first stage results. 釆用这种方式,可以更加准确地对通信参数进行设置。 Preclude the use of this embodiment, it is possible to more accurately set the communication parameters.

在数据的传输阶段,待发送数据被发送端的调制器调制后发送给接收端的解调器;接收端识别并接收到调制信号后经解调器解调后传送给终端。 In the data transmission phase, the data to be transmitted is transmitted after the transmitting end to the receiving end modulator modulates the demodulator; and identifying a receiving end after receiving the modulated signal to the terminal after the demodulation. 下面将结合附图和实施例对本发明的调制、解调方法及其装置分别进行说明。 It will modulation, demodulation method and apparatus of the present invention are explained in conjunction with the accompanying drawings and embodiments.

在下文中,调制器是指COFDM调制器A和COFDM调制器B;解调器是指COFDM解调器A和COFDM解调器B。 Hereinafter, modulator refers to a COFDM modulator A and B COFDM modulator; COFDM demodulator demodulator means A and B. The COFDM demodulator

下面将结合附图对本发明的调制器进行简要的介绍。 Following with reference to the modulator of the present invention will be briefly described.

图4是本发明实施例数据发送装置中的调制器的系统结构示意图。 4 is a schematic system configuration of a modulator according to the data transmission apparatus in the embodiment of the present invention. 如图4所示,该调制器包含:随机化单元,RS编码单元,交织单元,QAM映射单元,频域成帧单元,IFFT单元,保护间隔插入单元,DAC。 4, the modulator comprising: a random unit, RS coding unit, an interleaving unit, QAM mapping unit, a frequency domain framing unit, the IFFT unit, a guard interval insertion unit, DAC. 其中: among them:

随机化单元用于对输入数据进行随机化处理后输出; Randomizing means for randomizing the input data output processing;

RS编码单元用于将随机化单元输出的数据进行FEC (前向纠错编码) 编码后输出; RS encoding unit configured to output the data randomizing unit performs FEC (forward error correction encoding) the encoded output;

交织单元用于将RS编码单元输出的数据进行交织处理后输出; Means for interleaving the RS-encoded data output means outputs post-interleaving processing;

QAM映射单元用于将交织单元输出的数据根据比特及能量分配表中的子信道比特和能量分配信息进行QAM映射后输出; QAM mapping means for interleaving the data unit allocation information outputted from bit QAM mapping according to the energy and the bit allocation table and energy output subchannel;

频域成帧单元用于使用QAM映射单元输出的数据生成并输出频域数据 Frequency domain data framing unit used for output from the QAM mapping unit generates and outputs frequency domain data

帧; frame;

IFFT单元用于将频域成帧单元输出的频域数据帧进行IFFT变换,输出时域OFDM信号; IFFT unit for the frequency domain data in the frequency domain output frame framing unit IFFT transformation, the time domain OFDM signal output;

保护间隔插入单元用于将IFFT单元输出的时域OFDM信号添加循环前缀作为时域保护间隔,输出基带发送信号; The guard interval inserting unit configured to add a cyclic prefix to the time domain OFDM signal outputted from the IFFT unit as a time domain guard interval, the output of baseband transmit signals;

DAC用于将保护间隔插入单元输出的基带发送信号进行数模转换,输出基带模拟信号。 DAC for baseband transmit signals output from the interval inserting unit protected digital-analog conversion, the output baseband analog signal.

下面将结合附图对本发明调制器所采用的调制方法进行详细介绍。 It will now be described in detail in conjunction with the accompanying drawings of the modulation method employed in the present invention.

图5是本发明实施例数据传输方法中的调制方法的流程图。 FIG 5 is a flowchart of a modulation method for data transmission in the embodiment of the method of the present invention. 如图5所示, 该调制方法包含如下步骤: 5, the modulation method comprising the steps of:

201:待发送数据进入调制器后被分割成112字节长的物理层数据包, 物理层数据包被送入随机化单元进行随机化后,输出随机化数据包; 201: data to be sent into the modulator 112 is divided into bytes of physical layer data packet, the packet is sent to the physical layer randomization unit after randomization, output of the random data packet;

随机化单元由一个PRBS发生器产生PRBS序列,该PRBS序列与输入的物理层数据包进行模2加完成随机化。 Randomization unit generates a PRBS sequence by the PRBS generator, the physical layer data packets with the PRBS sequence inputted randomized complete modulo-2 addition.

上述PRBS序列的生成多项式为:x15+x14+l。 The above generator polynomial for the PRBS sequence: x15 + x14 + l.

202:随机化数据包被送入RS (Reed-Solomon,里德.所罗门)编码单元进行FEC (前向纠错编码)编码,输出128字节长的RS编码数据包; 202: randomized data packet is sent to RS (Reed-Solomon, Reed-Solomon) encoding unit performs FEC (forward error correction coding), the output of the RS-encoded 128 byte packet length;

RS编码单元使用如下参数:纠错能力t=8;数据总长度=128;数据原始长度=112。 RS encoding unit using the following parameters: the error correction capability t = 8; 128 = total data length; original data length = 112.

RS码的域生成多项式为:p(x) = x8 + x4 + x3 + x2 +1;RS码的码生成多项式为: RS code field generating polynomial: p (x) = x8 + x4 + x3 + x2 +1; RS code of the code generator polynomial is:

<formula>complex formula see original document page 15</formula> <Formula> complex formula see original document page 15 </ formula>

203: RS编码数据包被送入交织单元进行交织处理,输出交织数据包; 203: RS encoded packet is sent to the interleaving unit to perform interleaving processing, interleaving the output data packet;

交织单元采用巻积交织,其参数为:交织宽度1=8,交织深度M46。 Convolving using interleaving unit interleaving parameters are: a = width of 8 interleaved, the interleaving depth M46.

RS编码数据包经过交织处理可增强其RS码纠错的性能。 RS interleaved encoded packet processing which can enhance the performance of the RS code error correction.

204:交织数据包被送入QAM映射单元进行映射处理; 204: interleaving data packets are mapped into the QAM mapping processing unit;

映射单元根据信道初始化阶段获得的子信道比特和能量分配信息(存储在比特及能量分配表中),将交织数据包中的数据按相应的比特数分配给各子信道,并映射为相应的QAM星座点,输出QAM调制后的频域数据。 The channel mapping unit allocates subchannel obtained initialization phase and energy information bits (stored in the bit and energy allocation table), the interleaved data packet according to the corresponding number of bits assigned to each sub-channel, and is mapped to a corresponding QAM constellation points, the frequency-domain data output QAM modulation.

205: QAM映射单元输出的数据被送入频域成帧单元生成频域数据帧。 205: output unit QAM mapping data is fed into a frequency domain to generate frequency-domain data framing unit frame.

206:频域数据帧被送入IFFT (Inverse Fast Fourier Transform,快速傅立叶逆变换)单元进行IFFT变换,即进行OFDM调制而产生出时域OFDM 信号(包含若干个OFDM符号)。 206: frequency domain data frame is sent to IFFT (Inverse Fast Fourier Transform, Inverse Fast Fourier Transform) unit performs IFFT transform, i.e., performs OFDM modulation and generates a time domain OFDM signal (OFDM symbols comprising a plurality).

207: IFFT变换后生成的OFDM信号^皮送入保护间隔插入单元添加循环前缀作为时域保护间隔(TGI)就形成时域基带发送信号;时域基带发送信号经DAC (Digital Analog Convert,数模转换),生成基带模拟信号后送入测井电缆信道传输。 207: generated after the IFFT OFDM signal ^ sheath into the guard interval insertion unit adds a cyclic prefix to form the time-domain baseband transmission signal as a time domain guard interval (TGI); time-domain baseband transmission signal via the DAC (Digital Analog Convert, a digital to analog conversion), generating group into the logging cable transmission channel with analog signals.

图6是使用本发明实施例数据发送方法所形成的超帧结构示意图;如图6所示, 一个超帧由128个OFDM符号和2个同步帧组成。 FIG 6 is a schematic diagram of a superframe structure used in Example data transmission method of the embodiment of the present invention is formed; FIG. 6, a superframe consists of 128 OFDM symbols and two sync frames.

1个OFDM符号由1个CP和1个IFFT块构成;CP的长度为IFFT块长度的1/4。 One OFDM symbol is composed of a CP and the IFFT blocks 1; CP length of 1/4 of the length of IFFT block.

2个同步帧:SYNC和sync,分别位于第1个OFDM符号(Data0)之前,第64个OFDM符号(Data 63 )和第65个OFDM符号(Data 64)之间。 Two sync frames: SYNC and sync, are located in the first OFDM symbol (DataO) before, the first 64 OFDM symbols (Data 63) and 65 OFDM symbols (Data 64) between. 其中,SYNC与训练序列0相同,长度为256; sync巧为SYNC的反相。 Wherein, the same training sequence SYNC 0, length 256; sync coincidence is inverted SYNC.

下面将结合附图对本发明的解调器进行简要的介绍。 Following with reference to the demodulator of the present invention will be briefly described.

图7是本发明实施例数据发送装置中的解调器的系统结构示意图。 FIG 7 is a diagram of a system configuration example of the data transmission apparatus of the embodiment of the present invention a demodulator. 如图7所示,该解调器包含:ADp,时域均衡单元,信道信息获取器,AGC单元,同步校正单元,FFT ( Fast Fourier Transform,快速傅立叶变换)单元, 频域均衡单元,QAM解映射单元,解交织单元,RS译码单元,解随机化单元。 7, the demodulator comprising: ADp, time domain equalization unit, a channel information acquirer, the AGC unit, the synchronization correction unit, FFT (Fast Fourier Transform, Fast Fourier Transform) unit, a frequency domain equalizing unit, QAM solution a mapping unit, deinterleaving unit, RS decoding unit, de-randomization unit. 其中, among them,

ADC用于将输入的基带模拟信号进行模数转换,输出数字信号; ADC for the baseband analog signal input analog to digital conversion, a digital output signal;

时域均衡单元用于从信道信息获取器提取信道初始化阶段获得的时域均衡器系数,并使用该系数将ADC输出的数字信号进行时域均衡以截短信道冲激响应,使信道冲激响应造成的时延扩展落在TGI范围之内; The time domain equalizer means for extracting a time domain equalizer coefficients of the channel initialization phase obtained from the channel information acquirer, and using the coefficients of the digital signal from the ADC output of time domain equalization to cut short channel impulse response, so that the channel impulse response caused by delay spread falls within the scope of TGI;

AGC单元用于根据ADC输出的数字信号进行AGC参数的设置和调整; AGC unit for setting and adjusting the AGC parameter based on the digital signal output from the ADC;

同步校正单元用于从信道信息获取器提取信道初始化阶段获得的同步信息,并使用该信息对时域均衡单元输出的数据进入同步校正单元去除TGI 后输出; Synchronization correction unit is configured to obtain channel information from the extracted synchronization information channel initialization phase obtained, using the information data and time domain equalization unit outputs the synchronization correction unit enters after removal of TGI output;

争則ffi曰? Ffi said the dispute? 双?佐近4丁i义? Dual? I Ding Yi Zuo nearly 4? 天厄,'j Day Ecuador, 'j

频域均衡单元用于从信道信息获取器提取信道初始化阶段获得的频域均衡器系数,并使用该系数将FFT单元输出的数据进行频域均衡处理; Means for extracting a frequency domain equalizer the frequency domain equalizer coefficients of the channel initialization phase obtained from the channel information acquirer, and uses the coefficient data outputted from the FFT unit frequency-domain equalization processing;

QAM解映射单元用于从信道信息获取器提取初始化阶段获得的比特分配信息,并使用该信息将频域均衡单元输出的数据进行QAM解映射; QAM demapping means for bit allocation information acquirer extracts channel information from the initialization phase obtained, and using the information data outputted from frequency domain equalization section QAM demapping;

解交织单元和RS译码单元用于将QAM解映射单元输出的数据进行解交织和RS译码处理后输出; Deinterleaving unit and the RS decoding unit for the data outputted from QAM demapping unit deinterleaved and RS decoding process outputs;

解随机化单元用于将解交织单元和RS译码单元输出的数据进行解随机化后输出用户数据。 De-randomization unit for deinterleaving the data unit and the RS decoding unit outputs the de-randomizing output user data.

下面将结合附图对本发明解调器所采用的解调方法进行详细介绍。 We will now be described in detail in conjunction with the accompanying drawings of the present invention, a demodulator demodulating method employed.

图8是本发明实施例数据传输解调方法的流程图。 FIG 8 is a flowchart of a data transmission embodiment of the demodulating method of the present invention. 如图8所示,该解调方法包含如下步骤: 8, the demodulation method comprising the steps of:

301:基带模拟信号经ADC (Analog Digital Convert,模数转换)采样后送入时域均衡单元进行时域均衡以截短信道冲激响应,使信道冲激响应造成的时延扩展落在TGI范围之内。 301: baseband analog signal by the time domain equalization ADC (Analog Digital Convert, analog to digital conversion) into the time domain equalization unit to cut short the sampled channel impulse response that the channel impulse response delay spread caused by falls TGI range within.

时域均衡单元从信道信息获取器提取信道初始化阶段获得的时域均衡器系数进行时域均衡。 Acquiring time domain equalizer unit extracts a time domain equalizer coefficients obtained from the initialization phase channel time-domain channel equalization information.

此外,ADC采样后的数据还送入AGC单元进行AGC参数的设置和调整。 Furthermore, data is also fed to the ADC sampling unit AGC AGC setting and adjusting parameters.

同步校正单元从信道信息获取器提取信道初始化阶段获得的同步信息进行同步校正。 The synchronization correction unit acquires the channel information extracted by the synchronization initialization phase synchronization correction is obtained from the channel information.

303:同步校正单元输出的数据净皮送入FFT (Fast Fourier Transform,快速傅立叶变换)单元进行FFT变换。 303: synchronization correction unit outputs the data into the net Paper FFT (Fast Fourier Transform, Fast Fourier Transform) unit performs FFT transform.

304: FFT变换后输出的数据进入频域均衡单元进行频域均衡处理; 304: FFT data output from the converted into the frequency domain equalization unit performs frequency domain equalization processing;

频域均衡单元从信道信息获取器提取信道初始化阶段获得的频域均衡器系数进行频域均衡。 Frequency domain equalization section acquirer extracts frequency domain equalizer coefficients obtained from the initialization phase channel frequency domain equalization channel information.

305:频域均衡单元输出的数据进入QAM解映射单元进行QAM解映射; 305: frequency domain equalization unit outputs the data into the QAM demapping means for demapping QAM;

QAM解映射单元从信道信息获取器提取初始化阶段获得的比特分配信息进行QAM解映射。 Acquirer QAM demapping unit extracts the channel information from the bit allocation information is obtained initialization phase QAM demapping.

306: QAM解映射单元输出的数据进入解交织单元和RS译码单元进行解交织和RS译码处理后输出; 306: QAM demapping means outputs the data entry unit and a deinterleave unit after RS ​​decoding and RS decoding deinterleaved output;

解交织单元采用巻积解交织,其参数为:交织宽度1=8,交织深度M46。 Deinterleaving unit deinterleaves convolving employed, which parameters are: a = width of 8 interleaved, the interleaving depth M46. RS译码单元使用如下参数:纠错能力t二8;数据总长度=128;数据原始长度=112。 RS coding unit using the following parameters: the error correction capability t = 8; 128 = total data length; original data length = 112.

RS码的域生成多项式为:p(x)= x8 + jc4 + + ;c2 +1; RS码的码生成多项式为: RS code field generating polynomial: p (x) = x8 + jc4 + +; c2 +1; RS code of the code generator polynomial is:

g(x)= (x + + 乂)(x + ;L2)...(x +义15) = g16x16 +... + &x + g0 。 g (x) = (x + + qe) (x +; L2) ... (x + sense 15) = g16x16 + ... + & x + g0.

307:经解交织单元和RS译码单元处理后输出的数据进入解随机化单元进行解随机化以获得原始的用户数据; 307: de-interleaving the data unit and the RS decoding unit outputs processed into the de-randomization unit de-randomized to obtain the original user data;

解随机化单元由一个PRBS发生器产生PRBS序列,该PRBS序列与输入的物理层数据包进行模2加完成解随机化。 Derandomizer means generates a PRBS sequence by the PRBS generator, the physical layer data packet inputted PRBS sequence modulo-2 addition is completed derandomizer.

上述PRBS序列的生成多项式为:jc15+x14+1。 The above generator polynomial for the PRBS sequence: jc15 + x14 + 1.

综上所述,本发明根据OFDM技术在数据传输中的优越性,并结合测井系统的本身特点,提出了这种基于OFDM技术的测井电缆高速数据传输方法。 As described above, according to the present invention, in the data transmission OFDM technology advantages, and binding characteristics by logging system it is proposed that OFDM technology based on high-speed wireline data transmission method. 使用本发明的方法和装置,在7000米铠装测井电缆上可实现上传速率800kbps,下传速率30kbps的高速数据传输。 The method and apparatus of the present invention, in the 7000 m armored logging cable can be achieved upload rate 800kbps, 30kbps downlink high speed data transmission rate.

Claims (4)

1、一种信道初始化方法,应用于包含通过测井电缆相连的地面端和井下端的测井通信系统中,其特征在于,该方法包含如下步骤: A1)地面端调制解调器和井下端调制解调器分别向对方发送第一训练序列; B1)接收到第一训练序列的调制解调器完成信道激活、多载波时钟同步、多载波符号同步、多载波帧同步、AGC参数设置、发送功率调整、时域均衡器和频域均衡器的训练; C1)地面端调制解调器和井下端调制解调器分别向对方发送第二训练序列; D1)接收到第二训练序列的调制解调器该训练序列进行子信道SNR估计,根据估计得到的SNR值对每一子信道进行比特及能量分配; E1)地面端调制解调器和井下端调制解调器分别向对方发送子信道比特分配信息和子信道能量分配信息。 1. A method for initializing a channel, is applied to the ground terminal and comprising a downhole end of the wireline logging via a communication system is connected, which is characterized in that the method comprises the steps of: A1) the end surface and downhole modems to the other end of the modem, respectively, transmitting a first training sequence; Bl) receiving a first training sequence modem channel activation is completed, the multi-carrier clock synchronization, symbol synchronization of multi-carrier, multi-carrier frame synchronization, the AGC parameter, the transmission power adjustment, a time domain equalizer and frequency domain equalizer training; a C1) and a ground terminal of the modem side modem downhole second training sequence are transmitted to the other; Dl) receiving modem training sequence of the second training sequence subchannel SNR estimates, SNR value based on the estimated per a subchannel and bit energy distribution; E1) and a ground terminal of the modem side modem are transmitted downhole subchannel bit allocation information and the energy allocation information to the other subchannel.
2、 如权利要求1所述的信道初始化方法,其特征在于,在所述步骤B1)和C1)之间还包含如下步骤:地面端调制解调器和井下端调制解调器分别向对方发送第一ACK序列;在所述步骤Dl)和El)之间还包含如下步骤:地面端调制解调器和井下端调制解调器分别向对方发送第二ACK序列。 2, channel initialization method as claimed in claim 1, characterized in that, further comprising the step between the step B1) and C1): an end surface and downhole modems are transmitted first ACK terminal sequence of the modem to the other; in between said step Dl) and El) further comprises the steps of: ground side modem and the modem downhole end of the second ACK sequence are transmitted to the other party.
3、 如权利要求2所述的信道初始化方法,其特征在于,所述第一训练序列和第二训练序列对应的信号由PRBS进行BPSK调制而成,BPSK星座的映射规则为1→-1, 0→+1; PRBS的生成多项式为:x8+ x6+ x5+x4+1; 所述第二训练序列与第一训练序列具有不同的相位。 3, channel initialization method as claimed in claim 2, wherein the first training sequence and a second training sequence signal corresponding to the PRBS from the BPSK modulation, BPSK constellation mapping rule for 1 → -1, 0 → + 1; PRBS generating polynomial is: x8 + x6 + x5 + x4 + 1; the second training sequence with a first training sequence having a different phase.
4、 如权利要求3所述的信道初始化方法,其特征在于,所述第一ACK 序列和第二ACK序列对应的信号由PRBS进行BPSK调制而成,BPSK星座的映射规则为1→-1, 0→+1; PRBS的生成多项式为:x8+ x6+ x5+x4+1; 所述第一ACK序列、第二ACK序列与所述第一训练序列和第二训练序列具有不同的相位。 4, channel initialization method as claimed in claim 3, wherein said first and second ACK ACK sequence corresponding to the sequence of a signal from the BPSK modulation the PRBS, BPSK constellation mapping rule for 1 → -1, 0 → + 1; PRBS generating polynomial is: x8 + x6 + x5 + x4 + 1; the first ACK sequence, the second sequence with the first training ACK sequence and the second training sequences have different phases.
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CN103841062A (en) * 2012-11-21 2014-06-04 德克萨斯仪器股份有限公司 Initialization sequence for bi-directional communications in a carrier-based system
WO2017049443A1 (en) * 2015-09-21 2017-03-30 华为技术有限公司 Data transmission method, transceiver and system
CN107610435A (en) * 2017-08-18 2018-01-19 中国科学院地质与地球物理研究所 Suitable for the high speed logging remote transmission means of communication of polytype cable

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FI113721B (en) 1999-12-15 2004-05-31 Nokia Corp The method and receiver to improve the iterative channel
US7492743B2 (en) 2002-09-30 2009-02-17 Intel Corporation Assigning training sequences based on spatial channels in a wireless communications system
US7542515B2 (en) 2004-12-29 2009-06-02 Intel Corporation Training symbol format for adaptively power loaded MIMO

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Publication number Priority date Publication date Assignee Title
CN103841062A (en) * 2012-11-21 2014-06-04 德克萨斯仪器股份有限公司 Initialization sequence for bi-directional communications in a carrier-based system
CN103841062B (en) * 2012-11-21 2018-10-09 德克萨斯仪器股份有限公司 The method and apparatus of initialization sequence for the two-way communication in the system based on carrier wave
WO2017049443A1 (en) * 2015-09-21 2017-03-30 华为技术有限公司 Data transmission method, transceiver and system
CN107710669A (en) * 2015-09-21 2018-02-16 华为技术有限公司 A kind of data transmission method, transceiver and system
CN107610435A (en) * 2017-08-18 2018-01-19 中国科学院地质与地球物理研究所 Suitable for the high speed logging remote transmission means of communication of polytype cable

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