Broadband power line carrier and broadband wireless dual-mode communication system based on same OFDM system

Abstract

The invention provides a broadband power line carrier and broadband wireless dual-mode communication system based on the same OFDM system. The advantages of multipath fading resistance and strong anti-interference capability of the OFDM technology are fully utilized; an efficient coding modulation technology, a robust and flexible frame structure design, a signal processing technology, an adaptivetechnology and a networking technology are combined; the advantages of power line carrier communication and a micro-power wireless communication channel are brought into full play; the defects of pure power line carrier communication or micro-power wireless communication are overcome; and a single OFDM system is fused into a broadband power line carrier and a broadband wireless communication system, deep algorithm fusion is carried out on the broadband power line carrier and a broadband wireless physical layer, the complexity and cost of a dual-mode product are reduced, and a high-performance, low-power-consumption and low-cost implementation framework is achieved. The interference sources of power line carrier communication and wireless communication are completely different, a diversityreception effect is formed, the problem of blind spots is efficiently solved, and complete, robust and stable communication network coverage is formed.

Description

technical field [0001] The invention relates to the technical field of digital and analog information transmission, in particular to a data transmission system of OFDM power line carrier communication and micropower wireless. Background technique [0002] Power Line Communication (PLC) refers to a communication technology that uses power lines as a medium to realize data transmission. Since the power line is the most popular physical medium with the widest coverage, using power lines and other media to transmit data information does not require wiring, and at the same time, it can pass through walls without being blocked, which can effectively reduce operating costs and reduce the need to build new communications. Network expenditure, so power line communication technology is becoming a hot spot in the development of information technology. [0003] However, due to the complexity of the structure of the low-voltage power grid, the serious attenuation of high-frequency signa...

AI Technical Summary

Problems solved by technology

[0020] The purpose of the present invention is to solve the limitations of any single-mode wired (power line) or radio frequency wireless technology in practical applications: that is, the power line channel transmission environment is very harsh, there are multiple complex noise interference, coupling with other business frequency band signals, poor The frequency selectivity and fast time-varying nature of power line carrier seriously affect the reliability of power line carrier communication; while the usual micro-power wireless bandwidth is relatively narrow, the spectrum utilization rate is low, the anti-multipath interference ability is poor, and it is easy to be affected by transmission distance, building block, metal The communication success rate is unstable due to shielding, weather conditions, and the location of the antenna.

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