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OFDM power-frequency synchronous power carrier communication and physical layer coded modulation method

A technology of power carrier communication and modulation mode, which is applied in multi-frequency code system, multi-carrier system and other directions, can solve the problem of not mentioning the problem of power frequency synchronous transmission, and achieve the effect of improving utilization rate and high coding efficiency

Active Publication Date: 2016-10-05
HI TREND TECH SHANGHAI
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Problems solved by technology

[0006] U.S. Patent US2010 / 03161440A1 "Transmitter and Method ForApplying Multi-tone OFDM Based Communications within a Lower Frequency Range" discloses an OFDM system mainly used in low-frequency power line carrier communication. .9903) is the same, but does not mention the problem of power frequency synchronous transmission

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  • OFDM power-frequency synchronous power carrier communication and physical layer coded modulation method
  • OFDM power-frequency synchronous power carrier communication and physical layer coded modulation method
  • OFDM power-frequency synchronous power carrier communication and physical layer coded modulation method

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] In view of the periodic steady-state characteristics of the power carrier channel, OFDM bitloading (bitloading) technology can be extended to two-dimensional bit energy loading (bit andenergy loading) in the time domain and frequency domain, and the time domain only needs to cover one perio...

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Abstract

The invention discloses an OFDM power-frequency synchronous power carrier communication and physical layer coded modulation method. The communication method comprises that P OFDM symbols are sent within 1 / 2 AC power-frequency period, and P represents a positive integer; the SNR of each subcarrier and the corresponding OFDM symbol is measured repeatedly; and according to a measured SNR sequence, a bit loading table is generated via a time domain and frequency domain 2D ToneMap and sent to achieve the channel adaptability and improve the reliability and communication speed of the whole communication system. The method of the invention has the advantages that the sparsity of period static characteristic and noises in the time and frequency domains of power line noises is utilized fully, the utilization rate (speed) of a PLC channel is improved, the transmission reliability and the system throughput are improved, and coding efficiency is high. The method can support an OFDM power-frequency synchronous continuous sending mode as well as a discontinuous sending mode.

Description

technical field [0001] The invention relates to the field of low-frequency narrowband power line carrier communication, in particular to an OFDM power frequency synchronous power carrier communication and an OFDM physical layer coding and modulation method. Background technique [0002] There are many factors that affect the quality of power carrier communication, but the most important ones are the complex channel and noise environment on the power line. Noise, interference, and access impedance on low-voltage distribution lines usually exhibit cyclostationary characteristics, so the transfer function and signal-to-noise ratio (SNR) of the channel also exhibit periodic Steady-state characteristics, its cycle is usually consistent with the half cycle (zero crossing point) of AC power frequency (50Hz or 60Hz). In power line carrier communication, the main source of noise and interference is the impulsive noise (such as: energy-saving lamps, switching power supplies, inductio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/36
Inventor 张旭明
Owner HI TREND TECH SHANGHAI
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