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BER graph for codes with code rates of 0.5 and 0.75

BER graph for codes with code rates of 0.5 and 0.75

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FIGURE 1. Theoretical System Block Diagram of power line and wireless...
FIGURE 7. The narrowest dimension of the multi-dimensional EXIT charts
FIGURE 9. BER graph for codes with code rates of 0.5 and 0.75
Figs. 6 (a), (b) present the EXIT decoding polyline, which correspond...
Figs. 7 (a) and (b) are simulations of WFA optimization degree...
Improved EXIT Algorithm Based on Gaussian Mixture Model and Its Application to LDPC Construction in Coding Cooperative Systems with Hybrid Fading
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  • Mar 2020
In this study, an EXIT algorithm based on Gaussian mixture coding and multi-dimensional node information calculation is proposed. The objective is to solve the problem of performance analysis of cooperative communication and LDPC code construction under hybrid fading and impulse noise. First, Gaussian mixture model estimation of the decoding initia...
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... fading and impulse noise parameters are unchanged and the rate (R) is set to 0.75 to study the influence of the rate-rate distribution. The steps of Fig. 8 are repeated and compared with the parameter with a code rate of 0.75 as shown in Fig.9. ...

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... mean=variance/2), which simplifies the EXIT chart analysis. A modified multidimensional EXIT chart analysis has been studied in [57] using the Gaussian mixture model (GMM) for the power line and wireless communication hybrid fading channel. In our study, we have used this GMM approach along with modifications to the P-EXIT chart analysis carried out in [28]. ...
Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors
Article
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  • Jan 2024
The major problems in an underwater wireless optical communication (UWOC) link are turbulence induced fading and pointing errors. In this paper, we have investigated the bit error rate (BER) performance of spatially coupled low-density parity-check (SC-LDPC) coded horizontal UWOC link over a strong turbulent channel model with pointing errors. The performance of this link for different channel and code parameters has been studied using simulations. It has been observed that a rate 1/2 ARJA protograph based SC-LDPC code with graph lifting factor of 256 gives a coding gain of 47 dB at a BER of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> for strong turbulence channel model with pointing errors. An analytical BER expression for UWOC link under strong turbulence with pointing errors for On-Off Keying modulation technique has been derived. A multidimensional protograph based extrinsic information transfer algorithm has been developed to obtain the decoding thresholds for different channel parameters and code rates. We have also studied the SC-LDPC coded vertical UWOC link performance for some specific strong turbulence channel parameters with pointing errors and observed that as the link length increases from 20 m to 40 m , the performance gap between the hypothetical and cascaded channel models increases from 1.1 dB to 5.5 dB .
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