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OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and synchronization method thereof

A data transmission system and seismic data technology, applied in the field of oil and gas exploration, can solve the problems of unfavorable judgment synchronization and many side lobes of the objective function, avoid high complexity, improve the multi-side lobe and easy frequency offset estimation. Effect

Inactive Publication Date: 2011-11-09
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Therefore, it can be considered that the objective function has more side lobes, which is not conducive to setting the threshold value to judge the synchronization

Method used

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  • OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and synchronization method thereof
  • OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and synchronization method thereof
  • OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and synchronization method thereof

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Embodiment Construction

[0085] An OFDM-based digital seismograph data transmission system and its synchronization method, the system principle is:

[0086]At the sending end, after the collected digital seismic signals are encoded, the high-rate data stream is divided into multiple parallel relatively low-rate data streams through serial / parallel (S / P), and the M-ary system is performed on each data stream PSK or QAM is mapped into a complex signal, followed by an inverse fast Fourier transform (IFFT) to modulate the data on parallel and orthogonal subcarriers, which are transformed into serial OFDM symbols through parallel / serial (P / S) conversion, and then passed The power allocation module performs power allocation on the seismic OFDM symbols and training sequences, linearly superimposes the training sequences on a complete seismic OFDM symbol, adds a cyclic prefix (CP, cyclic prefix) before each symbol, superimposes the training sequence and adds cyclic The prefix's seismic OFDM symbols undergo di...

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Abstract

The invention provides an OFDM (orthogonal frequency division multiplexing)-based digital seismograph data transmission system and a synchronization method thereof, which are characterized in that the advanced OFDM technology is used as a transmission scheme in the transmission system. A transmitting terminal creates a training sequence based on conjugated symmetry of sequences, and then, overlays the training sequence on a complete OFDM; and a receiving terminal designs a simply structured synchronization algorithm based on the conjugated symmetry of training sequence to obtain a target function with single sharpness, and then, performs synchronous determination through a predetermined threshold so as to implement quick synchronization of the system. In comparison with the traditional overlaying period training sequence synchronization algorithm, the synchronization algorithm provided by the invention is low in computational complexity and quick in synchronization, can adapt to the digital seismograph data transmission system in high-rate transmission, and also can adapt to a wireless communication system using the OFDM technology.

Description

Technical field [0001] The invention is the field of oil and gas exploration, which specially involves a system synchronization method of digital seismic instrument data transmission system in oil and gas earthquake exploration. Background technique [0002] With the rapid development of the national economy, my country's demand for oil and minerals has become more and more vigorous.Earthquake exploration, as a fast and efficient earth physical exploration method, has been widely used in the field of energy exploration.As a key equipment for earthquake exploration, more than 90%relies on imported from abroad. The domestic independent research and development investment has less, which seriously restricts the development of my country's earthquake exploration.Although after many years of efforts in domestic research institutions, the development of the seismic meters has made great progress, but due to the constraints of data transmission technology, the seismic aisle capacity has...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 罗仁泽戈勇华党煜蒲黄元溢
Owner SOUTHWEST PETROLEUM UNIV
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