MSK demodulation circuit having zero-phase start-up

A demodulation circuit, zero-phase technology, applied in the field of MSK demodulation circuit, can solve the problem of not being locked, affecting the demodulation performance of the power carrier, to improve reliability, improve stability and integration, and simplify circuit design. Effect

Inactive Publication Date: 2012-02-22
CLOUDS GUANGDONG CLOUD COMPUTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the power carrier device using minimum frequency shift keying, the MSK demodulation circuit needs to use the carrier phase recovery phase-locked loop and the data bit phase recovery phase-locked loop; when the phase of the received waveform is inconsistent with

Method used

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  • MSK demodulation circuit having zero-phase start-up
  • MSK demodulation circuit having zero-phase start-up
  • MSK demodulation circuit having zero-phase start-up

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0024] Such as figure 1 As shown: the coupling transformer 1 has a primary side and a secondary side, the secondary side of the coupling transformer 1 has a transmitting terminal 2 and a receiving terminal 12, and the primary side of the coupling transformer 1 is connected to the corresponding live wire and neutral wire. During power carrier communication, the signal received by the receiving end 12 is filtered by the first filter 4, and the received carrier signal is amplified by the amplifying circuit 10, and the amplified signal is converted by the first analog-to-digital conversion module 5 for analog-to-digital conversion Demodulated by the MSK demodulation circuit 8, and then input into the controller 7. Wherein, the first filter 4 adopts a bandpass filter, the first analog-to-digital conversion module 5 is a one-bit analog-to-digital conversion; the MSK...

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PUM

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Abstract

The invention relates to an MSK demodulation circuit having zero-phase start-up. The MSK demodulation circuit comprises a zero-phase start-up module; and an output end of the zero-phase start-up module is connected with a third register as well as is respectively connected with a first register and a second register. The zero-phase start-up module carries out maximum correlation on a phase of a receiving signal and outputs a corresponded maximum correlation adjusting signal; the first register, the second register and the third register receive the maximum correlation adjusting signal input by the zero-phase start-up module and respectively adjust phases of output clocks of a first carrier digital oscillator, a second carrier digital oscillator and a data bit digital oscillator, so that sampling clock phases corresponded to a first carrier phase retrieval phaselocked loop, a second carrier phase retrieval phaselocked loop and a data bit phase retrieval phaselocked loop can be rapidly synchronized to the phase of the receiving signal. According to the invention, demodulation capability reliability is improved, a circuit design is simplified and the system stability and the integration level are improved; and thus, the MSK demodulation circuit is safe and reliable.

Description

technical field [0001] The invention relates to a demodulation circuit for power carrier communication, in particular to an MSK demodulation circuit with zero-phase start, and belongs to the technical field of power carrier. Background technique [0002] Minimum Frequency Shift Keying (MSK) is a special case of Frequency Shift Keying (FSK). MSK uses two sine waves in quadrature (frequency f 0 and frequency f 1 ) to represent 0 and 1; but unlike ordinary FSK, the frequency distance of MSK (f 1 -f 0 ) is only half of the data transmission rate R (1 / T, T is the time to transmit one bit of data), which greatly improves bandwidth efficiency. f c =(f 1 +f 0 ) / 2 is called the carrier center frequency. [0003] In the power carrier device using minimum frequency shift keying, the MSK demodulation circuit needs to use the carrier phase recovery phase-locked loop and the data bit phase recovery phase-locked loop; when the phase of the received waveform is inconsistent with the...

Claims

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Application Information

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IPC IPC(8): H04L27/22H04L7/033
Inventor 刘靖峰谢小彦
Owner CLOUDS GUANGDONG CLOUD COMPUTING TECH
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