Calculation Model of Outage Probability and Adaptive Relay Method for Mixed Media Communication System

Abstract

The invention provides an outage probability calculation model and an adaptive relay method of a mixed media communication system based on the AF / DF protocol. The outage probability calculation model uses the two-dimensional LogN approximation algorithm and the MGF of the output signal-to-noise ratio to derive a closed expression of the system outage probability when the relay adopts the AF and DF protocols; the adaptive relay method, in the outage Based on the probability calculation model, solve the signal-to-noise ratio equation to obtain the threshold value of the adaptive relay, and adaptively select the appropriate AF or DF protocol for information forwarding according to the threshold value, so as to realize an efficient relay process. The outage probability calculation model of the present invention has high accuracy and reliability, and the self-adaptive relay method effectively overcomes the shortcomings of AF and DF, and dynamically selects the AF or DF forwarding protocol according to the channel quality, without increasing the complexity of the system. Under the premise, the relatively optimal outage probability performance is obtained, thereby obtaining the best communication quality.

Description

technical field [0001] The invention belongs to the field of network communication, and in particular relates to a hybrid media communication system interruption probability calculation model and an adaptive relay method. Background technique [0002] Power line communication (power line communication, PLC) and wireless communication are important components of distribution network communication, and have broad application prospects in the fields of smart grid and home Internet of Things. However, the power line communication module needs to be fixed on the socket, and mobile access cannot be realized; and the power line channel is easily affected by line impedance, fading and impulse noise, etc., and the long-distance communication capability needs to be improved. On the other hand, although the wireless communication method has flexible access and simple networking, wireless high-frequency signals are easily blocked by obstacles such as doors, windows and walls, and the si...

AI Technical Summary

Problems solved by technology

In the prior art, although the adaptive relay protocol can effectively improve the spectral efficiency of the system, it needs to increase the feedback channel to the source node or the relay, but the feedback channel state information (Channel State Information, CSI) needs to open a special System resources, such as time slots, frequency bands, etc., the cost of feeding back CSI for self-adaptation is very high, which affects the effective information rate

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