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A dual-period qpsk continuous phase shift keying modulation and demodulation system

A phase shift keying, modulation and demodulation technology, applied in the modulation carrier system, phase modulation carrier system, transmission system and other directions, can solve the problems of mutual interference, coding errors, low transmission speed and bandwidth utilization, to prevent phase Mutual interference, guaranteed continuity, information transmission rate and improved effect of frequency band utilization

Active Publication Date: 2021-08-17
CNPC BOHAI DRILLING ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the modulation process of QDPSK, QPSK, and MPSK drilling fluid pressure carrier modulation signals, one bit period is composed of four carrier periods, and the transmission speed and bandwidth utilization are low.
[0003] Therefore, the market urgently needs a dual-period drilling fluid pressure wave signal QPSK modulation scheme to improve transmission speed and bandwidth utilization, and avoid mutual interference of 10-bit binary symbol phases, resulting in coding errors

Method used

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  • A dual-period qpsk continuous phase shift keying modulation and demodulation system
  • A dual-period qpsk continuous phase shift keying modulation and demodulation system
  • A dual-period qpsk continuous phase shift keying modulation and demodulation system

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0034] figure 1 It is a schematic diagram of the modulation circuit of the dual-period QPSK continuous phase shift keying modulation and demodulation system of the present invention; figure 2 It is the schematic diagram of the demodulation integrated circuit AD9854 of the dual-period QPSK continuous phase shift keying modulation system of the present invention; figure 1 As shown, the dual-period QPSK continuous phase shift keying modulation and demodulation system of the present invention includes, MCU microprocessor unit 10, DDS waveform generator 20, carrier signal unit 30, phase shifter unit 40, continuous phase phase shift key Control unit 50, low-pass filter unit 60, double period QPSK signal unit 70, cosine signal unit 80, low-pass filter 1 unit 90, decision module unit 100 and data output unit 110; Signal modulation part is by described...

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Abstract

The invention discloses a dual-period QPSK continuous phase shift keying modulation and demodulation system. The GPIO0 pin in the MCU microprocessor is used as the frequency update control FQUD signal, and the GPIO1 pin is used as the control word loading clock WCLK signal to output to the DDS waveform. Generator unit, the MCU microprocessor uses the CCS signal to logically control the DDS waveform generator unit to control the carrier frequency, initial phase, and waveform parameters of the DDS waveform generator; the beneficial effect is real-time monitoring of the analog downhole continuous wave pulse signal data flow and simulation The phase difference of the standard carrier signal is used to generate the time-domain waveform that satisfies the "0" and "1" digital streams to be transmitted downhole, so as to realize the uphole data transmission. The drilling fluid pressure double-cycle QPSK modulation is under the same bandwidth, and the information transmission rate and The utilization rate of the frequency band is doubled; it effectively prevents the two 10-bit symbol phases from interfering with each other.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling equipment, in particular to a drilling fluid continuous wave phase-shift keying modulation technology used in the coding technical field of wireless drilling equipment. Background technique [0002] At present, wireless measurement-while-drilling systems all use the transmission mode of drilling fluid pulses. With the increase of geological parameters while drilling wirelessly, the transmission rate of the positive pulse generator is difficult to meet the field requirements. Drilling fluid pressure multi-ary phase-shift keying (QPSK) continuous wave is an effective method to further improve the transmission rate of downhole data information. At present, in the modulation process of QDPSK, QPSK, and MPSK drilling fluid pressure carrier modulation signals, one bit period is composed of four carrier periods, and the transmission speed and bandwidth utilization are low. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04L27/227
CPCH04L27/2003H04L27/227
Inventor 宋晓健陈景旺张港生王岗徐红国董晨曦王栋车卫勤朱新生姜海峰
Owner CNPC BOHAI DRILLING ENG
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