Power supply self-synchronizing phase inversion modulator-demodulator for power line communication

A technology of power line communication and modem, which is applied in the field of power supply self-synchronization reverse phase modem, can solve the problems of meeting market demand gap, increasing system complexity, complex structure, etc. The effect of calculation amount and strong anti-interference ability

Active Publication Date: 2012-09-19
苏州东奇信息科技股份有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The traditional PLC system mainly adopts classic frequency shift keying (FSK) modulation or phase shift keying (PSK) modulation, and the demodulator first needs to recover the carrier wave when using coherent demodulation, and the structure is relatively complicated; recently, in order to improve the anti-interference ability, Modern communication technologies such as direct spread spectrum and orthogonal frequency division multiplexing (OFDM) are also used, but the bottom layer is still the basic BPSK (binary) or QPSK (quaternary) In terms of interference performance, it is still inevitable to lose sight of the other, and it is at the cost of greatly increasing the complexity of the system
Therefore, there is still a gap in existing technologies and products in meeting market demands

Method used

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  • Power supply self-synchronizing phase inversion modulator-demodulator for power line communication
  • Power supply self-synchronizing phase inversion modulator-demodulator for power line communication
  • Power supply self-synchronizing phase inversion modulator-demodulator for power line communication

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039]In order to achieve high-efficiency communication, we have invented a class of "unified orthogonal binary offset modulation and demodulation method" (invention patent number: ZL200710025203.6), the simplest and most commonly used and the best performance is a class Extended Binary Phase Shift Keying (EBPSK: ExtendedBinaryPhaseShiftKeying) modulation, its unified expression is:

[0040] the s 0 (t) = Asinω c t, 0≤t

[0041] s 1 ( t ) = B sin ( ω c t + θ ) ...

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Abstract

The invention discloses a power supply self-synchronizing phase inversion modulator-demodulator for power line communication, which adopts asymmetrical phase inversion modulation as a transmission signal, and utilizes the characteristic that a receiving terminal and a transmitting terminal have the same supply frequency, a typical phase-locked loop frequency synthesizer is firstly adopted to realize a signal generator which is strictly synchronous with the supply frequency, the synchronous signal generator is then utilized to replace a conventional crystal oscillator, accordingly, the receiving-transmitting frequency difference is thoroughly eliminated, the required steps of synchronization of carrier wave, sampling and clock for a power line digital communication receiver are completely omitted, so the self-synchronizing of a phase inversion modulation digital receiver demodulator for power line communication is realized.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and relates to a power line carrier data communication system, in particular to a method for transmitting and receiving synchronization of a low-voltage power line carrier modem, and more specifically, to a power supply self-synchronizing reverse phase modem for power line communication. Background technique [0002] It is well known that synchronization is the basis of digital communication. In a wireless communication system, due to factors such as Doppler frequency shift and oscillator stability, the transceiver frequency deviation and phase inconsistency, so the receiving end must first solve the carrier synchronization, that is, obtain or restore the carrier with the same frequency and phase as the sending end frequency. On this basis, a sampling pulse with a proportional relationship with the carrier frequency or symbol rate is further obtained, that is, sampling (clock) sync...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54
Inventor 吴乐南来斌王帆史亚光
Owner 苏州东奇信息科技股份有限公司
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