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Data transmitting, receiving method and device

A data sending method and a technology of a data sending device, which are applied to digital transmission systems, electrical components, and error prevention, and can solve problems such as low transmission rates, unsatisfactory transmission rates of logging systems, and small amounts of data, etc.

Inactive Publication Date: 2008-05-14
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Before the 1960s, analog modulation methods such as frequency modulation and amplitude modulation were basically used to transmit analog quantities, the amount of transmitted data was very small, and the transmission rate was also very low.
[0007] However, as the real-time requirements of modern logging systems are getting higher and higher, the amount of data that needs to be transmitted between surface equipment and downhole instruments is increasing, and the transmission rate of the current logging system can no longer meet the requirements

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  • Data transmitting, receiving method and device
  • Data transmitting, receiving method and device
  • Data transmitting, receiving method and device

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Embodiment Construction

[0081] The basic idea of ​​the present invention is to apply multi-carrier technology, especially OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology to the data transmission of the logging cable in order to increase the data transmission rate.

[0082] Multi-carrier technology is to realize parallel data transmission and multi-channel data transmission through technologies such as frequency division multiplexing (FDM) with overlapping spectrum, so as to improve the data transmission rate. Among them, a discrete Fourier transform (DFT) is usually used to realize the FDM scheme.

[0083] Among various FDM technologies, the OFDM technology based on the multi-carrier scheme is one of the most promising modulation and demodulation technologies in the field of communication technology. OFDM divides the high-speed information code stream into many low-speed code streams and transmits them in parallel on a set of orthogonal sub-cha...

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Abstract

A method and a device for transmitting and receiving data are provided. The method comprises the following steps: A: data to be transmitted are interleaved after being divided, randomized and conducted forward error correction coding on the transmitting terminal. B: QAM maps the interleaved data into corresponding QAM constellation points according to the sub-channel bit and energy distribution parameter. C: after the QAM mapping treatment, the data are generated into frequency field data frame, which are then conducted IFFT transformation and generated into OFDM signals. D: insert cyclic prefix into the OFDM signals, which are then generated into baseband analog signals after digital to analog conversion; the baseband analog signals are transmitted to the receiving terminal in the service sub-channel of the logging cable. By adopting the method and device of the invention, data transmission rate in present logging cable is greatly improved, which in turn meets requirements of the large data amount transmission of under-well instruments.

Description

technical field [0001] The invention relates to a data sending and receiving method and device, in particular to a data sending and receiving method and device for well logging cables. Background technique [0002] A logging system usually includes two parts: ground equipment (surface equipment) and downhole equipment (downhole equipment). The ground equipment and downhole equipment are connected by logging cables. The downhole instrument needs to transmit the collected data to the ground equipment through the logging cable; and the ground equipment also needs to transmit data such as control instructions to the downhole instrument. [0003] Logging operations began in the 1920s to 1930s, and the logging system experienced development from analog to digital. At present, it has developed to the fifth generation imaging logging stage. With the development of logging tools, the demand for data transmission rate is gradually increasing. [0004] In order to meet the increasin...

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Application Information

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IPC IPC(8): H04L1/00H04L27/34H04L27/26
Inventor 卢涛李群张菊茜张艺陈伟顾庆水伍瑞卿
Owner CHINA NAT OFFSHORE OIL CORP
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