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Dual-medium hybrid fading communication system performance analysis method based on AF (Amplify and Forward) protocol

An analysis method and communication system technology, applied in the field of dual-media cooperative communication systems, can solve the problems of high performance calculation complexity, key technology performance analysis relying on computer simulation, and communication theoretical performance does not exist, etc., to achieve the effect of simplifying performance

Active Publication Date: 2019-03-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

[0004] In the power line and wireless cooperative relay system, the system performance analysis for Nakagami-LogN mixed fading conditions has the following main problems: there is no closed expression for the theoretical performance of communication, the complexity of performance calculation is too high, and the performance analysis of key technologies relies too much on computer simulation etc.
However, the above method is not suitable for other fading (such as Nakagami fading) scenarios such as outdoor wireless communication. The influence of factors such as time-domain impulse noise, system capacity and outage probability on system performance is not considered in diversity combining.

Method used

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  • Dual-medium hybrid fading communication system performance analysis method based on AF (Amplify and Forward) protocol
  • Dual-medium hybrid fading communication system performance analysis method based on AF (Amplify and Forward) protocol
  • Dual-medium hybrid fading communication system performance analysis method based on AF (Amplify and Forward) protocol

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Embodiment 1

[0063] Such as figure 1 As shown, Embodiment 1 of the present invention adopts a three-node two-hop relay system model using wireless and power line dual-media hybrid cooperation. Wherein, the mobile terminal S performs wireless communication with the relay node R and the destination node D respectively, and the relay R and the node D perform power line communication (PLC). The system adopts half-duplex mode: in the first time slot, terminal S sends signal X to nodes R and D with transmit power PS S ; In the second time slot, the relay R uses the AF protocol to forward the received signal, and obtains the relay signal X R , then with power P R Send to node D through the power line channel.

[0064] In the system model, the three communication branches are affected by multiplicative fading and additive noise. in:

[0065] 1) In the wireless branches SR and SD of the first time slot, the noise n WR and n WD Satisfy the normal distribution N(0,N W ), wireless channel fadi...

Embodiment 2

[0078] Embodiment 2 of the present invention provides the Gamma and logN distribution diagrams before and after the approximation through Monte Carlo simulation and the actual receiving SNR, analyzes and obtains that the actual AF relay link receiving end SNR obeys the logarithmic normal distribution, And the similarity of Gamma to logN distribution.

[0079] Under different parameter conditions, Gamma distribution and specific LogN distribution have high similarity. Such as figure 2 As shown, when the wireless fading coefficient H WI (I∈{D,R}) Nakagami distribution parameter m R is 3.2, the actual The probability density (PDF) comparison curves of the corresponding Gamma distribution and LogN distribution with different parameters. In traditional performance analysis, the approximate PDF parameters can be calculated by matching the second moments of the PDFs of LogN and Gamma. Let the mean and variance of the PDF before and after the approximation be equal, and the Log...

Embodiment 3

[0085] Embodiment 3 of the present invention provides method steps for calculating system performance by using LogN variables and an approximation method. Known signal-to-noise ratio Γ k approximately satisfies the LogN distribution, considering γ AF is the wireless link signal-to-noise ratio γ WD and power line link signal-to-noise ratioγ PID The key to system performance analysis is the calculation of the distribution parameters. The steps of the LogN variable and the approximation method mainly include:

[0086] 1) Using the second-order moment approximation method to reduce the wireless fading G(m I ,Ω I / m I ) distribution is approximately I∈{D,R}.

[0087] 2) According to the nature of the LogN distribution, the signal-to-noise ratio of each branch γ WI and gamma PID Satisfy the LogN distribution, and the reciprocal of the LogN variable still satisfies the LogN distribution, we can get:

[0088]

[0089]

[0090]

[0091] 3) Considering that the sum...

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Abstract

The invention provides a dual-medium hybrid fading communication system performance analysis method based on an AF (Amplify and Forward) protocol, and belongs to the technical field of dual-medium cooperative communications. The method comprises the following steps: establishing a Moment Generating Function (MGF) model that satisfies the signal-to-noise ratio of a wireless link in the Nakagami distribution; establishing an MGF model that satisfies the signal-to-noise ratio of a power line link in the logarithmic normal distribution; according to the two MGF models respectively established in the above steps, determining an MGF model of the total signal-to-noise ratio of a system under Maximal Ratio Combining (MRC); and determining the bit error rate and outage probability of the system according to the system total signal-to-noise ratio MGF model. According to the dual-medium hybrid fading communication system performance analysis method based on the AF protocol provided by the invention, the system performance calculation complexity is simplified, optimal distribution parameters of system performance can be obtained, and a theoretical expression of the bit error rate and the outage probability of the system can be calculated approximately.

Description

technical field [0001] The invention relates to the technical field of a dual-media cooperative communication system, in particular to a performance analysis method for a dual-media mixed fading communication system based on an AF protocol. Background technique [0002] Power Line Communication (PLC) and wireless communication technology are important components of distribution network communication, and have broad application prospects in the fields of smart electricity consumption and home Internet of Things. PLC can rely on the existing power line infrastructure to transmit information; wireless communication has the characteristics of flexible wireless access and simple networking, which can realize mobile access, but the 2.4GHz radio frequency signal is easily affected by obstacles, and the signal attenuation is relatively large. Wireless communication and PLC have their own characteristics. Combined power line and wireless dual-media cooperative communication technolog...

Claims

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Application Information

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IPC IPC(8): H04B17/391H04B17/40H04B3/48H04B7/026
CPCH04B3/48H04B7/026H04B17/3911H04B17/40
Inventor 陈智雄景一方韩东升
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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