Iterative Equalization and Decoding over an Additive White Gaussian Noise Channel with ISI Using Low-Density Parity-Check Codes

Cuc, Adriana-Maria; Morgoș, Florin Lucian; Grava, Adriana-Marcela; Grava, Cristian

doi:10.3390/app132212294

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…It will be accomplished by measuring the fluctuation of power levels after the DAC outputs of the DSP system. Then, the type of coding will be upgraded with iterative decoding techniques in practice [11,35]. Relevant to this type of coding technique, it is commonly reported in the literature that their efficiency ranges from the superiority of bit-error-rate (BER) performance to power efficiency.…”

Section: Discussionmentioning

confidence: 99%

Flexible and Reconfigurable OFDM Implementation in DSP Platform for Various Purposes and Applications

Chronopoulos

2024

Sensors

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In the modern technological era of sophisticated applications and high-quality communications, a platform of clever strategy and quickly updated systems is needed. It should be capable of withstanding the fastest emerging problems like signal attenuation and hostile actions intended to harm the whole network. The main contributions of this work are the production of an OFDM system (with low cost) that can sustain high-speed communications and be easily adjusted with new integrated code while exhibiting the feasibility of implementing a transmitter–receiver system in the same DSP and demonstrating the holistic approach with the qualitative integration of such an architecture in a warfare scenario. Specifically, in this research, the point of view is toward three facts. The first is to show a method of quick self-checking the operational status of a digital signal processor (DSP) platform and then the pedagogical issues of how to fast check and implement an updated code inside DSPs through simple schematics. The second point is to present the prototype system that can easily be programmed using a graphical user interface (GUI) and can change its properties (such as the transmitted modulated sinusoids—orthogonal frequency division multiplexing subcarriers). Alongside the presentation, the measurements are presented and discussed. These were acquired with the use of an oscilloscope and spectrum analyzer. The third point is to qualitatively show the application of such a system inside a modern warfare environment and to recommend various potential system responses according to the development of such a platform of reconfigurable implemented OFDM systems. The implementation was performed for two types of systems: (1) transmitter and (2) transmitter–receiver system. Notably, the system acts quickly with a delay of about 1 msec in the case of transmitting and receiving in the same DSP, suggesting excellent future results under real conditions.

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Section: Discussionmentioning

confidence: 99%

Flexible and Reconfigurable OFDM Implementation in DSP Platform for Various Purposes and Applications

Chronopoulos

2024

Sensors

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Estimation of the Impulse Response of the AWGN Channel with ISI within an Iterative Equalization and Decoding System That Uses LDPC Codes

Cuc,

Morgoș,

Grava

et al. 2024

Entropy

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In this paper, new schemes have been proposed for the estimation of the additive white Gaussian noise (AWGN) channel with intersymbol interference (ISI) in an iterative equalization and decoding system using low-density parity check (LDPC) codes. This article explores the use of the least squares algorithm in various scenarios. For example, the impulse response of the AWGN channel h was initially estimated using a training sequence. Subsequently, the impulse response was calculated based on the training sequence and then re-estimated once using the sequence estimated from the output of the LDPC decoder. Lastly, the impulse response was calculated based on the training sequence and re-estimated twice using the sequence estimated from the output of the LDPC decoder. Comparisons were made between the performances of the three mentioned situations, with the situation in which a perfect estimate of the impulse response of the channel is assumed. The performance analysis focused on how the bit error rate changes in relation to the signal-to-noise ratio. The BER performance comes close to the scenario of having a perfect estimate of the impulse response when the estimation is performed based on the training sequence and then re-estimated twice from the sequence obtained from the output of the LDPC decoder.

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Iterative Equalization and Decoding over an Additive White Gaussian Noise Channel with ISI Using Low-Density Parity-Check Codes

Cited by 2 publications

References 41 publications

Flexible and Reconfigurable OFDM Implementation in DSP Platform for Various Purposes and Applications

Flexible and Reconfigurable OFDM Implementation in DSP Platform for Various Purposes and Applications

Estimation of the Impulse Response of the AWGN Channel with ISI within an Iterative Equalization and Decoding System That Uses LDPC Codes

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