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Hybrid medium communication system outage probability calculation model and self-adaptive relay method

A communication system and probability calculation technology, applied in the field of network communication, can solve problems such as high cost and affecting information rate

Active Publication Date: 2019-12-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Hybrid medium communication system outage probability calculation model and self-adaptive relay method
  • Hybrid medium communication system outage probability calculation model and self-adaptive relay method
  • Hybrid medium communication system outage probability calculation model and self-adaptive relay method

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no. 1 example

[0124] This embodiment provides an outage probability calculation model for a mixed media communication system based on an amplify-and-forward (AF) relay protocol. The mixed media communication system based on the AF relay protocol adopts Nakagami-LogN mixed fading and maximum ratio combining. The existing theoretical performance analysis of the system has the problem of multiple approximations. This embodiment comprehensively utilizes the two-dimensional LogN approximation algorithm and the moment generating function (MomentGenerating Function, MGF) of the system output signal-to-noise ratio to deduce that the mixed-media communication system is A closed expression for the outage probability when using the AF relay protocol.

[0125] The outage probability calculation model based on the AF relay protocol is:

[0126]

[0127] In formula (1), p 0 Indicates the instantaneous noise probability that only background noise exists in the power line channel, p 1 Indicates the ins...

no. 2 example

[0212]This embodiment provides an outage probability calculation model for a mixed media communication system based on a decode-and-forward (DF) relay protocol. The mixed media communication system based on DF relay protocol adopts Nakagami-LogN mixed fading and maximum ratio combining. The existing theoretical performance analysis of the system has the problem of multiple approximations. This embodiment comprehensively utilizes the two-dimensional LogN approximation algorithm and the MGF of the system output signal-to-noise ratio to derive the outage probability of the mixed-media communication system when the AF relay protocol is adopted. closed expression.

[0213] The outage probability calculation model of the mixed media communication system is:

[0214]

[0215]

[0216] The average outage probability is:

[0217]

[0218] in, is the outage probability of the first time slot, and the signal-to-noise ratio is γ WR , is the signal-to-noise ratio of the fir...

no. 3 example

[0256] This embodiment provides an adaptive relaying method for a mixed-media communication system based on a threshold value of signal-to-noise ratio, and the adaptive relaying method constitutes an adaptive relaying protocol based on a threshold value of signal-to-noise ratio (Adaptive Relay, AR). Figure 5 Shown is a schematic flow chart of the adaptive relay method. Wherein, the threshold value in the adaptive relay method is obtained according to the AF / DF protocol-based outage probability calculation model of the hybrid media communication system described in the first embodiment or the second embodiment. Such as Figure 5 As shown, the adaptive relay method includes the following steps:

[0257] Step S201, before the source node sends a signal, the relay uses the channel estimation algorithm to obtain channel fading and noise parameters and the average signal-to-noise ratio of the current channel.

[0258] In a relay communication system with wireless mobile access a...

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Abstract

The invention provides a hybrid medium communication system outage probability calculation model based on an AF / DF protocol and a self-adaptive relay method. The outage probability calculation model derives a closed expression of a system outage probability when a relay adopts AF and DF protocols by utilizing a two-dimensional LogN approximation algorithm and an MGF of an output signal-to-noise ratio; according to the adaptive relay method, on the basis of the outage probability calculation model, a signal-to-noise ratio equation is solved to obtain a threshold value of adaptive relay, and anappropriate AF or DF protocol is adaptively selected according to the threshold value for information forwarding, so that an efficient relay process is realized. According to the invention, the outageprobability calculation model has high accuracy and reliability; the self-adaptive relay method effectively overcomes the defects of the AF and the DF, the AF or DF forwarding protocol is dynamicallyselected according to the channel quality, and the relatively optimal outage probability performance is obtained on the premise of not increasing the system complexity, so that the optimal communication quality is obtained.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/06H04W40/22H04W40/12
CPCH04W24/06H04W40/22H04W40/12
Inventor 陈智雄王丽娇韩东升
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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