Performance of Sparse Code Multiple Access Communication System Based on Logarithmic Message Passing Algorithm and Low-Density Parity Check Code.
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| Title: | Performance of Sparse Code Multiple Access Communication System Based on Logarithmic Message Passing Algorithm and Low-Density Parity Check Code. |
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| Authors: | Moafaq, Mustafa Safwan1 Mustafa.S.Moafaq@uomustansiriyah.edu.iq, Al-Azawi, Maher K. Mahmood1 |
| Source: | Iraqi Journal for Electrical & Electronic Engineering. Dec2025, Vol. 21 Issue 2, p251-264. 14p. |
| Subjects: | Low density parity check codes, Multiple access protocols (Computer network protocols), Error rates, Data transmission systems, Message passing (Computer science), Decoding algorithms |
| Abstract (English): | The performance of Sparse Code Multiple Access (SCMA) communication system with Logarithmic Message Passing Algorithm (log-MPA) decoder is introduced. To boost the performance, a Low-Density Parity-Check Code LDPC is used together with Belief Propagation (BP) decoder. LDPC is chosen due to its sparsity property that complements the sparsity nature of SCMA for maximum efficiency and minimum complexity. Three distinct SCMA configurations are used. These are: A (4 x 4 x 6), B (4 x 16 x 6), and C (5 x 4 x 10) where the (K x M x V) are numbers of resources, codewords and users respectively. The performance of these configuration is shown in various channel conditions, various LDPC code rates and various numbers of SCMA iterations (NSCMA), to find the local minimum value of log-MPA. Simulation results showed that the LDPC greatly boosted the performance in mentioned configurations: In A configuration, a gain of 13 dB was observed. Configuration B experienced a substantial improvement of 23.5 dB, while C achieved a gain of 20.5 dB. Notably, configuration B stood out with the highest gain, attributed to LDPC's exceptional performance with high data rates, as the data transmitted in B was double that of A. [ABSTRACT FROM AUTHOR] |
| Abstract (Arabic): | تركز المقالة على تقييم أداء أنظمة الاتصال متعددة الوصول باستخدام الشفرة المتفرقة (Sparse Code Multiple Access - SCMA) عند دمجها مع خوارزمية تمرير الرسائل اللوغاريتمية (Logarithmic Message Passing Algorithm - log-MPA) وتقنيات تصحيح الأخطاء باستخدام رموز التحقق من التماثل منخفضة الكثافة (Low-Density Parity Check - LDPC). تم تحليل ثلاث تكوينات لـ SCMA وهي (4×4×6)، (4×16×6)، و(5×4×10)، والتي تمثل على التوالي أعداد الموارد، كلمات الشفرة، والمستخدمين، وذلك تحت ظروف تلاشي رايلي (Rayleigh fading) وقناة الضوضاء البيضاء الغاوسية (AWGN)، مع تغير معدلات رموز LDPC وعدد التكرارات المختلفة لفك تشفير SCMA. أظهرت نتائج المحاكاة أن دمج رموز LDPC يحسن بشكل كبير من أداء معدل خطأ البت (Bit Error Rate - BER)، حيث تم ملاحظة مكاسب تصل إلى 23.5 ديسيبل، خاصة في سيناريوهات معدلات البيانات العالية، في حين تقلل خوارزمية log-MPA من تعقيد عملية فك التشفير مقارنة بالطرق التقليدية. تسلط الدراسة الضوء على إمكانيات SCMA في دعم سيناريوهات المستخدمين الزائدين مع تحسين الكفاءة الطيفية وتقليل زمن الاستجابة، مما يشير إلى ملاءمتها لشبكات الاتصالات اللاسلكية المستقبلية مثل الجيل الخامس (5G) وما بعده. [Extracted from the article] |
| Copyright of Iraqi Journal for Electrical & Electronic Engineering is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 192139005 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Performance of Sparse Code Multiple Access Communication System Based on Logarithmic Message Passing Algorithm and Low-Density Parity Check Code. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Moafaq%2C+Mustafa+Safwan%22">Moafaq, Mustafa Safwan</searchLink><relatesTo>1</relatesTo><i> Mustafa.S.Moafaq@uomustansiriyah.edu.iq</i><br /><searchLink fieldCode="AR" term="%22Al-Azawi%2C+Maher+K%2E+Mahmood%22">Al-Azawi, Maher K. Mahmood</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Iraqi+Journal+for+Electrical+%26+Electronic+Engineering%22">Iraqi Journal for Electrical & Electronic Engineering</searchLink>. Dec2025, Vol. 21 Issue 2, p251-264. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Low+density+parity+check+codes%22">Low density parity check codes</searchLink><br /><searchLink fieldCode="DE" term="%22Multiple+access+protocols+%28Computer+network+protocols%29%22">Multiple access protocols (Computer network protocols)</searchLink><br /><searchLink fieldCode="DE" term="%22Error+rates%22">Error rates</searchLink><br /><searchLink fieldCode="DE" term="%22Data+transmission+systems%22">Data transmission systems</searchLink><br /><searchLink fieldCode="DE" term="%22Message+passing+%28Computer+science%29%22">Message passing (Computer science)</searchLink><br /><searchLink fieldCode="DE" term="%22Decoding+algorithms%22">Decoding algorithms</searchLink> – Name: Abstract Label: Abstract (English) Group: Ab Data: The performance of Sparse Code Multiple Access (SCMA) communication system with Logarithmic Message Passing Algorithm (log-MPA) decoder is introduced. To boost the performance, a Low-Density Parity-Check Code LDPC is used together with Belief Propagation (BP) decoder. LDPC is chosen due to its sparsity property that complements the sparsity nature of SCMA for maximum efficiency and minimum complexity. Three distinct SCMA configurations are used. These are: A (4 x 4 x 6), B (4 x 16 x 6), and C (5 x 4 x 10) where the (K x M x V) are numbers of resources, codewords and users respectively. The performance of these configuration is shown in various channel conditions, various LDPC code rates and various numbers of SCMA iterations (NSCMA), to find the local minimum value of log-MPA. Simulation results showed that the LDPC greatly boosted the performance in mentioned configurations: In A configuration, a gain of 13 dB was observed. Configuration B experienced a substantial improvement of 23.5 dB, while C achieved a gain of 20.5 dB. Notably, configuration B stood out with the highest gain, attributed to LDPC's exceptional performance with high data rates, as the data transmitted in B was double that of A. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Abstract (Arabic) Group: Ab Data: تركز المقالة على تقييم أداء أنظمة الاتصال متعددة الوصول باستخدام الشفرة المتفرقة (Sparse Code Multiple Access - SCMA) عند دمجها مع خوارزمية تمرير الرسائل اللوغاريتمية (Logarithmic Message Passing Algorithm - log-MPA) وتقنيات تصحيح الأخطاء باستخدام رموز التحقق من التماثل منخفضة الكثافة (Low-Density Parity Check - LDPC). تم تحليل ثلاث تكوينات لـ SCMA وهي (4×4×6)، (4×16×6)، و(5×4×10)، والتي تمثل على التوالي أعداد الموارد، كلمات الشفرة، والمستخدمين، وذلك تحت ظروف تلاشي رايلي (Rayleigh fading) وقناة الضوضاء البيضاء الغاوسية (AWGN)، مع تغير معدلات رموز LDPC وعدد التكرارات المختلفة لفك تشفير SCMA. أظهرت نتائج المحاكاة أن دمج رموز LDPC يحسن بشكل كبير من أداء معدل خطأ البت (Bit Error Rate - BER)، حيث تم ملاحظة مكاسب تصل إلى 23.5 ديسيبل، خاصة في سيناريوهات معدلات البيانات العالية، في حين تقلل خوارزمية log-MPA من تعقيد عملية فك التشفير مقارنة بالطرق التقليدية. تسلط الدراسة الضوء على إمكانيات SCMA في دعم سيناريوهات المستخدمين الزائدين مع تحسين الكفاءة الطيفية وتقليل زمن الاستجابة، مما يشير إلى ملاءمتها لشبكات الاتصالات اللاسلكية المستقبلية مثل الجيل الخامس (5G) وما بعده. [Extracted from the article] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Iraqi Journal for Electrical & Electronic Engineering is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.37917/ijeee.21.2.23 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 251 Subjects: – SubjectFull: Low density parity check codes Type: general – SubjectFull: Multiple access protocols (Computer network protocols) Type: general – SubjectFull: Error rates Type: general – SubjectFull: Data transmission systems Type: general – SubjectFull: Message passing (Computer science) Type: general – SubjectFull: Decoding algorithms Type: general Titles: – TitleFull: Performance of Sparse Code Multiple Access Communication System Based on Logarithmic Message Passing Algorithm and Low-Density Parity Check Code. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Moafaq, Mustafa Safwan – PersonEntity: Name: NameFull: Al-Azawi, Maher K. Mahmood IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 18145892 Numbering: – Type: volume Value: 21 – Type: issue Value: 2 Titles: – TitleFull: Iraqi Journal for Electrical & Electronic Engineering Type: main |
| ResultId | 1 |
