System and method for carrier and wireless physical layer fusion based on signal-to-noise ratio optimization

Abstract

The invention discloses a system and a method for carrier and wireless physical layer fusion based on signal-to-noise ratio optimization, wherein the system for carrier and wireless physical layer fusion based on signal-to-noise ratio optimization comprises a sending digital baseband signal processing module, a digital-to-analog conversion module, a wireless sending analog front end, a carrier sending analog front end, a wireless receiving analog front end, a carrier receiving analog front end, an analog-to-digital conversion module, a receiving channel selection module, a signal-to-noise ratio estimation and comparison module and a receiving digital baseband signal processing module. In the method for carrier and wireless physical layer fusion based on signal-to-noise ratio optimization of the invention, a uniform signal system is used for the carrier and the wireless at a physical layer, the carrier and the wireless are sent simultaneously or at different time at a sending end, two types of the communication signals at a receiving end are detected simultaneously, and one path with relatively higher signal-to-noise ratio is selected to be demodulated and decoded. Whereby, a problem of time synchronization and a problem of being liable to leave packets and lose packets caused by the need of channel switching are avoided.

Description

technical field [0001] The present invention relates to the technical field of power line carrier communication and the technical field of micro-power wireless communication, and in particular, to a system and method for carrier and wireless physical layer fusion based on signal-to-noise ratio optimization. Background technique [0002] Power line carrier is a unique communication method for power systems. Power line carrier communication refers to a technology that uses existing power lines to transmit analog or digital signals at high speed through carrier waves. The biggest feature is that there is no need to re-set up the network, as long as there are wires, data transmission can be carried out. However, the channel characteristics of low-voltage power networks are very complex, and the communication environment is also quite harsh. [0003] Power wireless communication is realized by wireless channel, and the performance of communication is mainly restricted by wireles...

AI Technical Summary

Problems solved by technology

[0006] Existing technical solutions include that the carrier and wireless adopt their own independent physical layer structure, and integrate the two communication information at the protocol layer or application layer. This method requires complex protocol conversion and rate adaptation, which brings additional Software overhead, the independent physical layer increases the implementation cost; on the other hand, it involves the channel switching of the two communication modes and other mechanism design. When the two channels change rapidly with time, inappropriate switching design will cause packet loss in reception And success rate is not high, capacity decline and other issues

Another carrier and wireless physical layer fusion communication method separates the carrier and wireless frequency bands during the physical layer baseband signal processing, and shares a set of modulation and demodulation signal processing circuits, but the modulation and demodulation signal processing circuits must be simultaneously To process both carrier and wireless signals, the processing bandwidth is more than doubled, and the complexity is high

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