Belief propagation-based joint iterative algorithm for detection and decoding in asynchronous CDMA satellite systems
As the geostationary orbit (GEO) is congested in the commercial Ku band, the adjacent satellites will receive the interference from small aperture terminals which have a wide field of view. To reduce the interference toward the adjacent satellites, code division multiple access (CDMA) with spread sp...
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| Veröffentlicht in: | EURASIP journal on wireless communications and networking Jg. 2013; H. 1 |
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| Abstract | As the geostationary orbit (GEO) is congested in the commercial Ku band, the adjacent satellites will receive the interference from small aperture terminals which have a wide field of view. To reduce the interference toward the adjacent satellites, code division multiple access (CDMA) with spread spectrum needs to be adopted in the satellite communications on-the-move system. However, the mutual interference between CDMA users leads to the performance loss, which is not acceptable for the power-sensitive small aperture terminals, and the computation complexity is still an intractable problem when the conventional iterative minimum mean square error (MMSE) scheme is employed to suppress the multiple access interference (MAI) in satellite systems especially that is coded by low-density parity-check (LDPC) code. Moreover, the long transmission delays of different users caused by the long transmission distance require the robustness of the interference suppression for the asynchronous case. In this paper, a joint chip-level algorithm for CDMA multiuser detection and LDPC decoding with a new and simple iterative structure based on belief propagation (BP) for satellite systems is developed, which integrates the iterations of multiuser detection and the iterations of LDPC decoding with factor graphs. Through analysis and simulations, it is verified that the proposed algorithm is robust to the asynchronous CDMA satellite system, and with the similar iterative complexity, the performance of the proposed algorithm outperforms that of the conventional iterative MMSE scheme in the asynchronous CDMA satellite system. |
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| AbstractList | As the geostationary orbit (GEO) is congested in the commercial Ku band, the adjacent satellites will receive the interference from small aperture terminals which have a wide field of view. To reduce the interference toward the adjacent satellites, code division multiple access (CDMA) with spread spectrum needs to be adopted in the satellite communications on-the-move system. However, the mutual interference between CDMA users leads to the performance loss, which is not acceptable for the power-sensitive small aperture terminals, and the computation complexity is still an intractable problem when the conventional iterative minimum mean square error (MMSE) scheme is employed to suppress the multiple access interference (MAI) in satellite systems especially that is coded by low-density parity-check (LDPC) code. Moreover, the long transmission delays of different users caused by the long transmission distance require the robustness of the interference suppression for the asynchronous case. In this paper, a joint chip-level algorithm for CDMA multiuser detection and LDPC decoding with a new and simple iterative structure based on belief propagation (BP) for satellite systems is developed, which integrates the iterations of multiuser detection and the iterations of LDPC decoding with factor graphs. Through analysis and simulations, it is verified that the proposed algorithm is robust to the asynchronous CDMA satellite system, and with the similar iterative complexity, the performance of the proposed algorithm outperforms that of the conventional iterative MMSE scheme in the asynchronous CDMA satellite system. |
| ArticleNumber | 234 |
| Author | Ni, Zuyao Gu, Na Lu, Jianhua Wu, Sheng Kuang, Linling |
| Author_xml | – sequence: 1 givenname: Na surname: Gu fullname: Gu, Na email: gun08@mails.tsinghua.edu.cn organization: Department of Electronic Engineering, Tsinghua University – sequence: 2 givenname: Sheng surname: Wu fullname: Wu, Sheng organization: Department of Electronic Engineering, Tsinghua University – sequence: 3 givenname: Linling surname: Kuang fullname: Kuang, Linling organization: Tsinghua Space Center, Shenzhen Key Laboratory of Wireless Broadband Communication and Signal Processing, Tsinghua University – sequence: 4 givenname: Zuyao surname: Ni fullname: Ni, Zuyao organization: Research Institute of Information Technology, Tsinghua University – sequence: 5 givenname: Jianhua surname: Lu fullname: Lu, Jianhua organization: Department of Electronic Engineering, Tsinghua University |
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| Cites_doi | 10.1109/TIT.2010.2096033 10.1109/MCOM.2007.4342825 10.1109/49.821707 10.1109/JSTSP.2011.2166950 10.1109/JPROC.2007.896497 10.1007/978-3-642-25002-6_60 10.1109/JSAC.2008.080208 10.1109/18.748992 10.1109/18.910572 10.1109/49.661103 10.1109/JSAC.2008.080402 10.1088/0305-4470/36/43/030 10.1017/CBO9780511619199 10.1109/TCOMM.2005.852852 10.1109/TCOMM.2002.1006557 10.1109/JSTSP.2011.2168943 10.1109/JSAC.2004.823442 10.1109/26.774855 |
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| Copyright | Gu et al.; licensee Springer. 2013. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
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| Keywords | Factor Graph LDPC Code Multiuser Detection Minimum Mean Square Error Code Division Multiple Access |
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IEEE J doi: 10.1109/JSAC.2008.080208 |
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| Snippet | As the geostationary orbit (GEO) is congested in the commercial Ku band, the adjacent satellites will receive the interference from small aperture terminals... |
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| SubjectTerms | Communications Engineering Engineering Information Systems Applications (incl.Internet) Networks Signal,Image and Speech Processing |
| Title | Belief propagation-based joint iterative algorithm for detection and decoding in asynchronous CDMA satellite systems |
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