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

Abstract

The invention discloses a multi-frequency networking method based on the OFDM in a power line communication system. The multi-frequency networking method comprises the steps that one or more main nodes and a center node are set in each sub-node, the sub-nodes adjacent in physical communication distance form a sub-domain, and a center node is set in each sub-domain; the sub-domains adjacent in physical communication distance are adjacent sub-domains, and communication among the sub-domains is achieved through the center nodes; a working band of the communication system is divided into a plurality of sub-frequency bands which are not crossed; when the sub-nodes are in communication, the OFDMA technology is adopted to set OFDM sub-carriers corresponding to sub-frequency bands for communication among the sub-nodes in each sub-domain and communication among the center nodes among the sub-domains to be effective sub-carriers, and the rest of sub-carriers is set to be virtual sub-carriers. The multi-frequency networking method can meet the various networking requirements, equipment cost and complexity are low, the shortcomings of an existing networking method in the power line communication system are overcome, conflict and network signaling spending in communication are lowered, mutual interference among equipment is reduced, and the system capacity and the communication performance of the network are improved.

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 power line channels with convenient transmission and abundant resources has been widely researched and applied. Power line communication (Power Line Communications, PLC) has many advantages, such as widely distributed power line network, relatively low communication cost, and plug and play everywhere. [0003] At present, many manufacturers have conducted research and product development on the characteristics of power line communication systems. Power line communication has also received extensive attention in academia, and many standards and industry alliances have emerged, such as the European Union's Power Line Smart M...

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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