Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation

A technology of power line carrier and pilot signal, applied in the field of digital information transmission, can solve the problem that the pilot signal is difficult to adapt to the requirements of the frequency band

Active Publication Date: 2015-09-30
深圳市力合微电子股份有限公司
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Problems solved by technology

The current leading signal is difficult to adapt to t...

Method used

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  • Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation
  • Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation
  • Method for generating leading signals of power line carrier communication systems on basis of OFDM (orthogonal frequency division multiplexing) modulation

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Embodiment Construction

[0064] The preferred embodiments of the invention will be described in further detail below.

[0065] like Figures 1 to 7 As shown, a method for generating a preamble signal of a power line carrier communication system based on OFDM modulation according to an embodiment is used to generate a preamble signal of an OFDM power line carrier communication system.

[0066] Step S1: Set the OFDM symbol characteristic parameters of the system, including the working frequency band, the subcarrier spacing, and the number of IFFT points.

[0067] First, define the OFDM symbol characteristic parameters of the system, as shown in the following table:

[0068] Table 1 OFDM narrowband power line carrier communication system parameters

[0069] Indicator

value

Operating frequency (kHz)

250

Number of IFFT points N

512

Working frequency band (kHz)

41.992～88.867

Subcarrier spacing Δf

488.28125Hz

[0070] Among them, the working ...

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Abstract

The invention discloses a method for generating leading signals of power line carrier communication systems on the basis of OFDM (orthogonal frequency division multiplexing) modulation. The method includes steps of S1, setting characteristic parameters of OFDM symbols; S2, designing a group of long binary pseudo random sequences PN (pseudo noise) <L> with the lengths of NL according to IFFT (inverse fast Fourier transformation) point numbers N; S3, primarily mapping BPSK (binary phase shift keying) symbols of the pseudo random sequences PN<L> to obtain BPSK modulation signals and filling corresponding effective sub-carriers with the BPSK modulation signals; S4, carrying out discrete fast Fourier inverse transformation on the BPSK modulation signals to obtain OFDM basic signals; S5, designing a group of binary short sequences PN<S> with the code lengths of NS; S6, carrying out BPSK modulation on the short sequences PN<S> to obtain short sequence symbols; S7, jointly modulating the OFDM basic signals by the aid of the short sequence symbols to obtain joint modulation signals of NS sections; S8, determining the leading signals according to the joint modulation signals of the NS sections. The characteristic parameters include the IFFT point numbers. The method has the advantage that the method is applicable to complicated multi-path channel environments of power lines.

Description

【Technical field】 [0001] The present invention relates to the technical field of digital information transmission, in particular to a method for generating a preamble signal of a power line carrier communication system based on OFDM modulation. 【Background technique】 [0002] Power line carrier communication technology, referred to as PLC, refers to a communication method that uses power lines to transmit data. The working frequency of the power line carrier communication is much higher than the power frequency signal 50Hz or 60Hz of the power grid. Such high frequency signals can be transmitted in the power line at the same time as the electric energy. Therefore, the existing low-voltage distribution network infrastructure can be fully utilized without any wiring. It is a "No New Wires" technology, which saves resources, saves manpower, saves cable investment, and speeds up network opening time. In particular, the power line carrier communication system can be applied in t...

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Application Information

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IPC IPC(8): H04L27/26H04B3/54
CPCH04B3/542H04L27/2662H04L27/2663H04L27/2692
Inventor 不公告发明人
Owner 深圳市力合微电子股份有限公司
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