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    • 23. 发明申请
    • METHOD AND SYSTEM FOR TRANSMITTING A DATA FRAME OF AN ELECTROMAGNETIC TELEMETRY SIGNAL TO OR FROM A DOWNHOLE LOCATION
    • 用于发送电磁遥测信号的数据帧或从一个卧室位置发送的方法和系统
    • WO2014176703A1
    • 2014-11-06
    • PCT/CA2014/050423
    • 2014-05-02
    • EVOLUTION ENGINEERING INC.
    • SWITZER, DavidLIU, JiliXU, Mingdong
    • E21B47/13G08C19/14H04J1/00
    • E21B47/122G08C19/14H04J9/00H04L5/06H04L7/06
    • Methods, techniques, and systems for transmitting a data frame of an electromagnetic (EM) telemetry signal to or from a downhole location can be performed using multi- channel transmissions in which at least two different channels at two different frequencies are used to send a long header and the data frame. At least a portion of the long header is transmitted at a first frequency, and at least a portion of the data frame and any remaining portion of the long header not transmitted at the first frequency are transmitted at one or more additional frequencies different from each other and the first frequency. In one example, only two channels are used: one channel is used to transmit all of the long header, another channel is used to transmit all of the data frame, and either of the channels is used to transmit an identifier identifying the type of the data frame.
    • 可以使用多信道传输来执行用于向井下位置发送电磁(EM)遥测信号的数据帧的方法,技术和系统,其中使用两个不同频率的至少两个不同信道来发送长 标题和数据框。 以第一频率发送长报头的至少一部分,并且以不同于彼此的一个或多个附加频率发送数据帧和长报头的任何剩余部分不以第一频率发送的至少一部分 和第一个频率。 在一个示例中,仅使用两个信道:一个信道用于发送所有长报头,另一个信道用于发送所有数据帧,并且任一个信道用于发送标识标识类型的标识符 数据框。
    • 24. 发明申请
    • A METHOD FOR SYNCHRONIZING A RADIO RECEIVER TO A RECEIVED DATA BIT STREAM
    • 将无线电接收器同步到接收到的数据位流的方法
    • WO0193463A3
    • 2002-05-23
    • PCT/US0117080
    • 2001-05-30
    • SOPHIA COMMUNICATIONS INCCAMPANA THOMAS J JRJEWER ALSMITH GORDONFRIES ROBERTPONSCHKE MICHAEL P SR
    • CAMPANA THOMAS J JRJEWER ALSMITH GORDONFRIES ROBERTPONSCHKE MICHAEL P SR
    • H04B7/26H04J9/00H04L7/04
    • H04J9/00H04L2007/047
    • A method is provided for continuous received data bit stream synchronization in a receiver/transmitter in a wireless communications system through the use of a fixed frequency reference tone, which is simultaneously included in a same channel as a data signal being transmitted. The reference signal comprises a sinosoidal signal having fixed amplitude, fixed phase, and fixed frequency. This signal has a periodic association with the transmitted data signals and can be used to align the data sampling circuits of the receiver with the demodulated data signal. By comparing the received tone signal with a known reference set of parameters stored in memory, the relative amplitudes and timing alignment errors can be quickly determined, and appropriate corrective signals can be sent to data extraction modules. This allows accurate reception of large messages without the need to send multiple bit-synchronization preambles.
    • 提供了一种通过使用固定频率参考音调在无线通信系统中的接收机/发射机中连续接收的数据比特流同步的方法,该固定频率参考音同时被包括在与被发送的数据信号相同的信道中。 参考信号包括具有固定幅度,固定相位和固定频率的正弦信号。 该信号与传输的数据信号具有周期性关联,并且可以用于将接收机的数据采样电路与解调的数据信号对准。 通过将接收到的音调信号与存储在存储器中的已知参数参数集合进行比较,可以快速确定相对幅度和定时对准误差,并将适当的校正信号发送到数据提取模块。 这允许准确地接收大的消息,而不需要发送多个位同步前导码。
    • 25. 发明申请
    • A TELETRANSMISSION NETWORK, NETWORK ELEMENTS THEREFOR AND A METHOD OF IDENTIFYING THE SYNCHRONIZATION OF A NETWORK ELEMENT
    • TELETRANSMISSION网络,网络元素及其识别网络元素同步的方法
    • WO99009686A2
    • 1999-02-25
    • PCT/DK1998/000351
    • 1998-08-14
    • H04J3/06H04J7/00H04L7/033H04L7/04H04Q11/04
    • H04J9/00H04J3/0647H04J2203/0051H04J2203/006H04L7/043
    • A teletransmission network comprises a plurality of network elements, each of which is capable of emitting and/or receiving data signals, and of which one or more (21) may be a synchronization source for other network elements (31), the data rate of the signals emitted from the synchronization source determining the data rate of the signals emitted from these other network elements. The networks elements (21) capable of serving as a synchronization source may vary the data rate of the emitted signals. The other network elements (31) comprise means (38, 39) for detecting whether the data rate of the received signals varies in the same manner as the variation of the signals emitted from the synchronization source. A method of identifying whether a network element (31) is synchronized to a given synchronization source comprises varying the data rate in the synchronization source, checking in the network element (31) whether the data rate of the received signals varies correspondingly, and, if so, considering the network element (31) to be synchronized to said synchronization source. The method may be applied in e.g. an SDH system or a SONET system.
    • 传输网络包括多个网元,每个网元能够发射和/或接收数据信号,并且其中一个或多个(21)可以是其他网络元件(31)的同步源,数据速率 从同步源发射的信号确定从这些其它网络单元发射的信号的数据速率。 能够用作同步源的网络元件(21)可以改变发射信号的数据速率。 其他网络元件(31)包括用于检测接收信号的数据速率是否以与从同步源发射的信号的变化相同的方式变化的装置(38,39)。 一种识别网元(31)是否与给定的同步源同步的方法包括改变同步源中的数据速率,检查网元(31)接收信号的数据速率是否相应变化,如果 因此,考虑到要与所述同步源同步的网元(31)。 该方法可以应用于例如 SDH系统或SONET系统。
    • 29. 发明专利
    • Time division multiplex transmission system
    • 时分多路传输系统
    • JPS5917747A
    • 1984-01-30
    • JP12811482
    • 1982-07-21
    • Matsushita Electric Ind Co Ltd
    • KANEDA HIROSHI
    • H04J3/00H04J9/00
    • H04J9/00
    • PURPOSE:To make the wide-dynamic range transmission possible without regulating the amplitude of an analog signal, by superimposing transmission clocks, which are obtained by synthesizing a frame synchronizing signal and a sampling signal, upon the signal. CONSTITUTION:Respective analog signals of channels are sliced in a control circuit 1 by a prescribed level, and respective signal components are sampled by a sampling circuit 2 to multiplex them in time division. The sampling signal and the frame synchronizing signal are generated by a modulating circuit 4 and are applied to a mixing circuit 3 together with the output signal which is multiplexed in time division by the circuit 2. Respective signals are superimposed upon one another by the mixing circuit 3 and are transmitted to the receiving side and are applied to a sample holding circuit 5 and a slicer 6 in the receiving side. Analog signal components are eliminated by the slicer 6, and sampling signal and the frame synchronizing signal components are demodulated by a demodulating circuit 7. This demodulated signal is applied to the circuit 5, and respective analog signals of channels are separated from one another, and thus, the transmission with a wide dynamic range is possible.
    • 目的:通过将通过合成帧同步信号和采样信号获得的传输时钟叠加在信号上,使得可以在不调节模拟信号的幅度的情况下实现宽动态范围传输。 构成:通道的相应模拟信号在控制电路1中被切片规定的电平,各个信号分量由采样电路2进行采样,以分时复用。 采样信号和帧同步信号由调制电路4产生,并与由电路2分时复用的输出信号一起施加到混频电路3.各信号通过混频电路 3并被发送到接收侧,并且被施加到接收侧的采样保持电路5和限幅器6。 模拟信号分量由限幅器6消除,并且采样信号和帧同步信号分量由解调电路7解调。该解调信号被施加到电路5,并且信道的相应模拟信号彼此分离,并且 因此,具有宽动态范围的变速器是可能的。