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Method for realizing power line carrier communication system

A technology of power line carrier and communication system, which is applied in the field of wired communication and can solve the problem of high cost

Inactive Publication Date: 2007-06-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

On the one hand, this is due to the relatively mature and popular technologies and products such as ADSL and HFC in the United States. More importantly, because the low-voltage distribution transformers in the United States are generally single-phase, they only provide power supply services for 5 to 6 users on average, and promote high-speed PLC. Due to the high cost of access technology

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  • Method for realizing power line carrier communication system
  • Method for realizing power line carrier communication system
  • Method for realizing power line carrier communication system

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Embodiment Construction

[0088] The system uses OFDM as the modulation technology of the system. OFDM is a multi-carrier modulation technology with partially overlapping spectrum. It was first used in military wireless communication in the late 1950s. In the mid-1960s, Chang proposed a multi-channel transmission method for band-limited signals, that is, simultaneously transmitting multiple channels of information on a linear band-limited channel, and eliminating Inter-Carrier Interference (ICI) and Inter-symbol Interference (Inter -Symbol Interference). In 1971, Weinstein and Ebert introduced DFT (DiscreteFourier Transform) into the OFDM system and used it for baseband modulation and demodulation. But they used symbol guard interval and time-domain raised cosine window to control ISI and ICI, which destroyed the orthogonality between carriers. In 1980, Peled and Rui proposed a cyclic prefix (CP) method to replace the guard interval to control ISI and ICI, which solved the problem of orthogonality and ...

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Abstract

This invention relates to a broad band high speed power carrier communication method for realizing power line carrier communication system including an emission end and a receiving end connected by power lines, in which, the actual working flow includes: a PC generates data flows and transmits them according to the requirement of the data segment part in the frame format of the system, the actual working flow of the receiving end includes: signals transmitted by channels pass through a coupler at the receiving end then to carry carrier waves, which is a process of converting signals down corresponding to the transmission end, and communication rate is greater than or equal to 100Kbps and direct communication distance is greater than or equal to 100m and the system Internet access is realized.

Description

technical field [0001] The invention is a method for high-speed transmission of data signals in power lines, in particular a method for broadband high-speed power carrier communication based on Orthogonal Frequency Division Multiplexing (OFDM), which belongs to the technical field of wired communication. Background technique [0002] The current communication methods include wireless channel communication and wired channel communication. Power Line Communication (Power Line Communication) technology refers to a system based on the power transmission network that realizes communication between various nodes within the power line communication network and with other communication networks. . Its history can be traced back to the 1920s. At that time, the power line communication technology mainly used high voltage above 11kV for long-distance information transmission, and the working frequency was below 150kHz. Later, this frequency band became the official frequency band of po...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04B7/26H04L27/26H04L5/02
Inventor 于东海张海健邹采荣
Owner SOUTHEAST UNIV
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