"G3 PLC物理层规范：OFDM电力线通信协议文档总结"

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The G3 PLC physical layer Specification outlines the detailed communication protocol for the international standard G3 PLC, focusing on the physical layer aspect of the system. The document specifies the Physical Layer block for an Orthogonal Frequency Division Multiplexing (OFDM) Powerline Communications (PLC) system, specifically as part of ERDF’s G3 "Automated Meter Management" (AMM) technical specification. The scope of the specification covers the technical requirements and guidelines for the implementation of the G3 PLC physical layer, ensuring compatibility and reliability in communication systems. The document emphasizes the use of OFDM technology for efficient data transmission over powerline networks, enhancing the performance and robustness of the G3 PLC system. Key components addressed in the specification include modulation schemes, channel coding techniques, synchronization methods, and power control mechanisms to optimize the communication process. The specification also outlines testing procedures and performance metrics to validate the compliance of G3 PLC devices with the physical layer requirements. Overall, the G3 PLC physical layer Specification serves as a comprehensive guide for developers, manufacturers, and stakeholders involved in the deployment of G3 PLC systems, offering a detailed framework for implementing a standardized and efficient communication protocol for powerline networks.

PLC G3 PHYSICAL LAYER SPECIFICATION

Page 8 of 46

4. G

ENERAL

ESCRIPTION

ERDF is planning to develop and implement an Automatic Metering Management (AMM) system

to manage the complete electricity supply chain, from electricity suppliers all the way to

consumers. The system will provide a reliable two-way communication using OFDM-PLC

between meters installed at the customers' premises and the concentrator, communicating in a

Master and Slave configuration.

The following diagram illustrates AMM system.

Système

central

AMM

Compteurs Concentrateur

LAN/CPL

Systèmes d’informationWAN

Réseau étendu

WAN

Client final &

Box fournisseur

Réseau basse

tension

Poste HTA/BT Réseau télécom. Centre de

supervision EDF

SI Clients - Fournisseurs

SI Réseau

SI Gestion - Finance

SI Déploiement

SI Gestion des interventions

Fournisseur

Equipements

réseau élec.

Figure 1- Network Architecture

The AMM architecture consists of the 5 following main components:

- The meter, which needs to integrate the capabilies of measuring power consumption,

simple load control, and customer remote information.

- The hub, which acts as an intermediary between the AMM information system and the

meters. Complementary equipment supplied by the electrical network that can be

connected downstream of the hub,

- The PLC (LAN) technology, allowing the use of a low voltage electrical network to

exchange data and commands between meters and hubs,

- Remote connection (WAN) allowing connection between the hubs and the AMM central

IS,

- The central system, which not only handles its own functional services but also supplies

metering services to the existing or forthcoming ENTERPRISE services (deployment IS,

network IS, management-finance IS, customer-supplier IS-Intervention management IS,

etc.). The customer-supplier IS is the interface between the Suppliers and AMM for

handling their requirements.

PLC G3 PHYSICAL LAYER SPECIFICATION

Page 9 of 46

5. P

HYSICAL LAYER

PECIFICATION

This section specifies the physical layer block using Orthogonal Frequency Division Multiplexing

(OFDM) system in the CENELEC band.

5.1. O

VERVIEW OF THE

YSTEM

The power line channel is very hostile. Channel characteristics and parameters vary with

frequency, location, time and the type of equipment connected to it. The lower frequency regions

from 10kHz to 200kHz are especially susceptible to interference. Furthermore, the power line is a

very frequency selective channel. Besides background noise, it is subject to impulsive noise often

occurring at 50/60Hz, and narrowband interference and group delays up to several hundred

microseconds.

OFDM is a modulation technique that can efficiently utilize the limited bandwidth of CENELEC,

and thereby allows the use of advanced channel coding techniques. This combination facilitates a

very robust communication over power line channel.

Figure 2 shows the block diagram of an OFDM system. The CENELEC bandwidth is divided into

a number of sub-channels, which can be viewed as many independent PSK modulated carriers with

different non-interfering (orthogonal) carrier frequencies. Convolutional and Reed-Solomon

coding provide redundancy bits allowing the receiver to recover lost bits caused by background

and impulsive noise. A time-frequency interleaving scheme is used to decrease the correlation of

received noise at the input of the decoder, providing diversity.

The OFDM signal is generated by performing IFFT on the complex-valued signal points that are

produced by differentially encoded phase modulation and which are allocated to individual sub-

carriers. An OFDM symbol is built by appending a cyclic prefix to the beginning of each block

generated by IFFT. The length of cyclic prefix is chosen so that a channel group delay will not

cause successive OFDM Symbols or adjacent sub-carriers to interfere.

A blind channel estimator technique is used for link adaptation. Based on the quality of the receive

signal, the receiver decides on the modulation scheme to be used. Moreover, the system

differentiates the subcarriers with bad SNR and does not transmit data on them.

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