OFDM-based multi-frequency networking method and device in power line communication system

Abstract

The invention discloses an OFDM-based multi-frequency networking method in a power line communication system, which includes: setting one or more master nodes and a central node in the sub-nodes, and the sub-nodes whose physical communication distances are close to each other form a sub-domain , a central node is set in the sub-domain; the sub-domains whose physical communication distance is close to each other are adjacent sub-domains, and the communication between sub-domains needs to pass through the central node; the working frequency band of the communication system is divided into several disjoint sub-frequency bands; the sub-domains Nodes use OFDMA technology to set the OFDM sub-carriers corresponding to the sub-frequency bands for communication between sub-nodes in a sub-domain and communication between central nodes between sub-domains as effective sub-carriers, and the rest as virtual sub-carriers. The method proposed by the invention can adapt to various networking requirements, has low equipment cost and complexity, can overcome the shortcomings of the networking method in the existing power line communication system, reduce communication conflicts and network signaling overhead, and reduce mutual interference between devices. Improve the system capacity and communication performance of the network.

Description

technical field [0001] The invention relates to the technical field of digital signal transmission, in particular to an OFDM-based multi-frequency networking method and device in a power line communication system. Background technique [0002] In recent years, with the rapid development of modern communication technology, efficient digital communication in the power line channel with convenient transmission and rich resources has been widely studied and applied. Power Line Communications (PLC) has many advantages, such as widely distributed power line networks, relatively low communication costs, and plug-and-play anywhere. [0003] At present, many manufacturers have carried out research and product development on the characteristics of power line communication systems, and power line communication has also received extensive attention in academia, resulting in many standards and industry alliances, such as the European Union's Power Line Smart Meter Evolution Standard (PRI...

AI Technical Summary

Problems solved by technology

However, most of the sub-nodes of the current power line communication system adopt the design method of analog frequency conversion. Each sub-node needs to design and manufacture multiple frequency conversion units and analog front-ends corresponding to multiple frequency bands, resulting in high equipment complexity and networking costs.

In addition, how to avoid mutual interference caused by devices with close communication distances using the same or adjacent frequencies is also an important problem that needs to be solved in the current multi-frequency networking.

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