Influence of BCH and LDPC Code Parameters on the BER Characteristic of Satellite DVB Channels

Jordanova, L. T.; Laskov, L. B.; Dobrev, D.

doi:10.48084/etasr.394

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…In GNSS, the quality of the signal is directly linked with positioning and navigation accuracy. Strong CNR values with minimal fluctuations result in better positioning performance [12,13]. However in urban canyons, the CNR tends to be lower and fluctuates around the nominal asynchronously due to superposition of direct LOS and one or more NLOS signals.…”

Section: Methodsmentioning

confidence: 99%

Complexity and Limitations of GNSS Signal Reception in Highly Obstructed Enviroments

Hussain

Akhtar

Khand

et al. 2021

Eng. Technol. Appl. Sci. Res.

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Multipath (MP) and/or Non Line-Of-Sight (NLOS) reception remains a potential vulnerability to satellite-based positioning and navigation systems in high multipath environments, such as an urban canyon. In such an environment, satellite signals are reflected, scattered or faded, and sometimes completely blocked by roofs and walls of high-rise buildings, fly-over bridges, complex road structures, etc. making positioning and navigation information inaccurate, unreliable, and largely unavailable. The magnitude of the positioning error depends on the satellite visibility, geometric distribution of satellites in the sky, and received signal quality and characteristics. The quality of the received signal (i.e. its statistical characteristics) can significantly vary in different environments and these variations can reflect in signal strength or power, range measurements (i.e. path delay and phase difference), and frequency, all of which distort the correlation curve between the received signal and receiver-generated replicas, resulting in range errors of tens of meters. Therefore, in order to meet stringent requirements defined for the Standard Positioning Service (SPS), the characterization of distortions that could significantly affect a Global Navigation Satellite System (GNSS) signal is essentially important. The scope of this paper is to detect possible imperfections/deviations in the GNSS signal characteristics that can occur due to MP or NLOS reception and analyze its effects. For this purpose, analysis of fading patterns in received signal strength (i.e. Carrier-to-Noise Ratio and strength fluctuations) is carried out in both clear LOS and high MP environment and then its impact on satellite lock state (i.e. tracking) is assessed. Furthermore, phase fluctuations and range residuals are computed to analyze the effects of path delays. The results show that significant variations can occur in GNSS signal characteristics in the MP environment that may result in loss of lock event and inaccurate/faulty range measurements.

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Section: Methodsmentioning

confidence: 99%

Complexity and Limitations of GNSS Signal Reception in Highly Obstructed Enviroments

Hussain

Akhtar

Khand

et al. 2021

Eng. Technol. Appl. Sci. Res.

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“…Fig. 2 indicates the mapping relations between the input and output BER of the BCH decoder with different LDPC code-rate and the 16APSK modulation [16], [17]. For example, the FEC is able to improve BER performance from 0.02 to as low as 10 −4 by applying LDPC-9/10.…”

Section: A Fec Codementioning

confidence: 99%

Joint Digital Analogue DVB-S2(X) Link Optimization in Non-Linear Channel

Sun

Goussetis

et al. 2022

IEEE Access

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Future broadband satellite communication (SatCom) systems require a high throughput of data transmission, which calls for operation at higher frequency bands. Adaptive coding and modulation (ACM) technology has been considered as a means to obtain improved performance further at these frequencies. However, the ACM protocols in current DVB-S2 and DVB-S2(X) standards do not take the effects that arise from the non-linear link with memory into account, which is generated by the cascade of a high-power amplifier (HPA) and digital root raised cosine (RRC) filters. This paper first reveals the non-linear characteristics of the SatCom link, and transfers this into an equivalent full-linear link with an additive noise source thanks to the pre-distortion algorithm. Using this equivalent modeling, an approach of selecting/adapting the optimum coding, modulation scheme and associated system configurations for a given channel fading level is proposed. Both simulations and experimental test-bed performance are presented to validate the proposed method.

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“…Due to the use of spreading code employing the Duffing Map-based chaotic binary sequence, the broadband signal usually suffers from the SNR degradation in the chaos-based spread spectrum system under constant channel capacity according to Hartley-Shannon law. To overcome this shortcoming, the use of an irregular LDPC code was proposed [20] to maintain the desirable SNR by coding gain. The advantages of irregular LDPC code can be summarized as: (a) it is suitable for parallel implementation, (b) it is more amenable to high coding rate, (c) has lower error floor, and (d) has superior error correcting capability.…”

Section: Irregular Ldpc Codementioning

confidence: 99%

Modeling and Analysis of Chaos-based Spread Spectrum Scheme using Irregular LDPC Code and Non-Coherent 16-DCSK under Fading and Jamming

Wei

Kim

2019

Eng. Technol. Appl. Sci. Res.

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In chaos-based spread spectrum systems, the use of spreading code and chaotic binary sequence expands the bandwidth of the information-bearing signal but this expansion results in SNR degradation under the constraint of constant channel capacity according to Hartley-Shannon law. To compensate for this drawback, our proposed model employs an irregular low-density parity-check (LDPC) code with its iterative decoding algorithm. Coupled with this forward error correction (FEC) coding, we used non-coherent (NC) 16-ary differential chaos shift keying (16-DCSK) that additionally provides the ability of data encryption due to its use of chaotic signals compared with the conventional modulation schemes. Analytical expressions of bit error probability (BEP) are derived under the assumption of the three-ray model along with partial band noise jamming (PBNJ) over a Rayleigh fading channel. Simulation results assert that the proposed system can mitigate the effect of PBNJ via lowering BEP by coding gain and processing gain under identical transmission power. It is also confirmed that a higher level of security can be provided by the use of proposed two iteration functions of Duffing Map-based chaotic binary sequence than the security level of one iteration function of Logistic Map, based on the balance and autocorrelation analysis.

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Influence of BCH and LDPC Code Parameters on the BER Characteristic of Satellite DVB Channels

Cited by 8 publications

References 15 publications

Complexity and Limitations of GNSS Signal Reception in Highly Obstructed Enviroments

Complexity and Limitations of GNSS Signal Reception in Highly Obstructed Enviroments

Joint Digital Analogue DVB-S2(X) Link Optimization in Non-Linear Channel

Modeling and Analysis of Chaos-based Spread Spectrum Scheme using Irregular LDPC Code and Non-Coherent 16-DCSK under Fading and Jamming

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