Implication of LDPC Technique in Non-ideal Multiuser Communication System

Marcu, Ioana; Halunga, Simona

doi:10.1007/s11277-015-2627-4

Cited by 7 publications

(6 citation statements)

References 27 publications

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“…In the paper, Marcu and Halunga [4] analyzed a multi-user CDMA system behavior using a minimum mean square error (MMSE) detector. In the presence of LDPC/Turbo coding and decoding techniques, the LDPC-Code DS-CDMA system performance is investigated when an optimal multi-user detector is used in the recovery of the information data, and the performance is improved with a BER = 10 -3 for SNR = 4 dB in an AWGN channel.…”

Section: Related Workmentioning

confidence: 99%

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Enhancement of code division multiple access system performance using raptor codes

Farhan

Zaghar

Abdullah

2022

IJEECS

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Some kinds of communication systems work in very low signal-to-noise (LSNR) environments. For these systems to function reliably, <span>specific techniques and methodologies have to be used to mitigate the degrading effects of the channel. The channel coding method is the key element in most LSNR communication systems, but emphasizing the code division multiple access (CDMA) is a new transmission technique in these channels. To enhance the CDMA scheme's system capacity and reach unprecedented ranges of LSNR values in wireless sensor network. This paper suggests combining CDMA with certain types of channel coding algorithms, such as the raptor codes. The raptor channel encoding technique has improved the CDMA system's performance when using binary phase-shift keying (BPSK) modulation in additive white gaussian noise (AWGN) channels. It has achieved a low bit error rate in range of 10-7 at Eb/No value of (-3) dB and about 10-6 at shannon's limit. The Raptor-coded CDMA scheme works well for channel signal to noise ration (SNR) values of greater than -9 dB, showing an improvement of about 7 dB compared with turbo/convolutional channel coding methods used with the CDMA system bit error rate (BER) and throughput. On the other hand, it has been shown that the convolutional encoder presents the weakest performance compared to both the turbo and raptor codes.</span>

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Section: Related Workmentioning

confidence: 99%

“…It has been assumed that the structure of the parity-check matrix H has no girth of 4. Also, we have used a regular LDPC with dimensions of (4,204) in H so that the number of ones per column is 4, and the number of ones per row is 204. These codes are characterized by a high code rate of 50/51 [33].…”

Section: Raptor Coded Ds-cdma Systemmentioning

confidence: 99%

Enhancement of code division multiple access system performance using raptor codes

Farhan

Zaghar

Abdullah

2022

IJEECS

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“…In fact, the bandwidth requirement has resulted in a search for the protocol that may be utilized to increase bandwidth utilization. Code Division Multiple Access (CDMA) is a method for accommodating multiple users with various rate and Quality of Service (QoS) requirements in the same bandwidth and at the same time in the third and fourth generations of mobile communication systems [4]. Users can share the channel with the CDMA system through the use of signal properties or codes.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of CDMA Wireless Sensor Networks in Low SNR Channels Based on Raptor Codes

Mahmoud

Zaghar

Abdullah

2023

Wireless Pers Commun

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Some kinds of communication systems work in very low signal to noise power ratio (SNR) environments. For these systems to function reliably, certain techniques and methodologies have to be used to mitigate the degrading effects of the channel.The channel coding method is the key element in most low SNR communication systems with emphasis on the Code Division Multiple Access (CDMA) as a recommended transmission technique in these channels. To enhance the system capacity of the CDMA scheme and reach to unprecedented ranges of low SNR values in systems like the Wireless Sensor Network (WSN), this paper suggests a technique for combining CDMA with certain types of channel coding algorithms such as the Raptor codes. The Raptor channel encoding technique has shown an improved performance for the CDMA system when using BPSK digital modulation in AWGNchannels. It has achieved a low bit error rate in the range of 10 -6 at Eb/No value of -2 dB and 10 -7 at Eb/No value of -3 dB for code rates 1/2 and 1/3 resprctively. The Raptor-coded CDMA scheme showing an improvement of about 6 dB when compared with some other channel coding methods used with the CDMA system for the same BER.

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“…The increasing demand for wireless communication services with the effect of developing technology has made it necessary to search for techniques that will increase the capabilities of existing digital communication systems [1]. Digital data transmission provides higher noise immunity and greater flexibility in terms of bandwidth-power dilemma than analogue transmission.…”

Section: Introductionmentioning

confidence: 99%

Comparison of communication performance of block coding methods in different channels using DWT

Yıldız

Karagöl

2020

IET Communications

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Implication of LDPC Technique in Non-ideal Multiuser Communication System

Cited by 7 publications

References 27 publications

Enhancement of code division multiple access system performance using raptor codes

Enhancement of code division multiple access system performance using raptor codes

Performance Improvement of CDMA Wireless Sensor Networks in Low SNR Channels Based on Raptor Codes

Comparison of communication performance of block coding methods in different channels using DWT

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