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Study on Technology of Sine-Like Signal Communication

Author: XuZhuo
Tutor: ZhangShiPing
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: LWD Class sine communication Magnetic transmission channel DSP CPLD
CLC: TN914
Type: Master's thesis
Year: 2010
Downloads: 29
Quote: 0
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Abstract


Oil drilling technology relies on the development of intelligent LWD technology . But the current data transfer speed downhole MWD bottleneck restricting the whole oil drilling technology. This topic drilling technology for data transmission status of sine- communications technology, and the way other carriers with a dozen or even dozens represents one yard per waveform cycle compared to , you can use a periodic waveform on behalf of a symbol , the signal the carrier frequency is the information transmission bit rate , which can greatly improve the speed of data communications , a general significance and broad applications . This article describes the sinusoidal modulation class definition and the basic principles of the modulation parameter selection , its time-domain waveform and frequency spectrum simulation. To highlight the sine-like characteristics, to further optimize the waveform , to band narrower so less noise superimposed , but also to facilitate the receiver filter design . Further , when the signal frequency is high , the class sinusoidal modulation difficult , using different duty cycle square waves instead of sine- modulated signal , but to ensure the modulation parameters unchanged . In theory and simulation , based on the paper, based on magnetic induction power transmission lines and two channel communication scheme . Using DSP as a processing chip designed based on the power line channel digital modulation and demodulation hardware circuit and signal coupling circuit and prepared a modem software algorithms ; additionally demonstrates the magnetic induction transmission channel using sine-like technical feasibility , and for this channel design CPLD for the modulation and demodulation processing chip hardware circuits and software programs. Build a communication experiment system , the transmission performance of the two programs were tested . Experiments show that the design of the communication data transmission scheme works well, bit error rate, and speeds of up to 600kbps or more.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system)
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