Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system
In cellular mobile communication systems using coded modulations, the spectrum efficiency of the system is related to the number of available codes. Recently, large area synchronous (LAS) CDMA codes, which exhibit a region called interference free window (IFW) within some delay-spread, have been acc...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/11429/1/Spectrum%20Efficiency%20Enhancement%20in%20Dynamic%20Space%20Coded%20Multiple%20Access.pdf |
| _version_ | 1825944908175769600 |
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| author | Ng, Chee Kyun Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod |
| author_facet | Ng, Chee Kyun Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod |
| author_sort | Ng, Chee Kyun |
| collection | UPM |
| description | In cellular mobile communication systems using coded modulations, the spectrum efficiency of the system is related to the number of available codes. Recently, large area synchronous (LAS) CDMA codes, which exhibit a region called interference free window (IFW) within some delay-spread, have been accepted as one of fourth-generation (4G) wireless communication systems. However, the number of synthesized LAS codes is very low due to the low duty ratio of the sequence. In this paper, a dynamic space coded multiple access (DSCMA) scheme which utilizes the spatial diversity from smart antenna system is proposed to overcome the low spectrum efficiency in LAS CDMA system. In the DSCMA a modified version of LAS codes called LAS even ternary (LAS-ET) codes is proposed. These codes are used together with a novel algorithm called dynamic space code (DSC), which will decrease the code length so that the spectrum efficiency can be increased. By taking advantage of dynamic code reuse assignment in spatial diversity, the spectrum efficiency of the DSCMA can be further increased significantly. |
| first_indexed | 2024-03-06T07:23:16Z |
| format | Article |
| id | upm.eprints-11429 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:23:16Z |
| publishDate | 2010 |
| publisher | Springer |
| record_format | dspace |
| spelling | upm.eprints-114292016-12-01T08:24:46Z http://psasir.upm.edu.my/id/eprint/11429/ Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system Ng, Chee Kyun Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod In cellular mobile communication systems using coded modulations, the spectrum efficiency of the system is related to the number of available codes. Recently, large area synchronous (LAS) CDMA codes, which exhibit a region called interference free window (IFW) within some delay-spread, have been accepted as one of fourth-generation (4G) wireless communication systems. However, the number of synthesized LAS codes is very low due to the low duty ratio of the sequence. In this paper, a dynamic space coded multiple access (DSCMA) scheme which utilizes the spatial diversity from smart antenna system is proposed to overcome the low spectrum efficiency in LAS CDMA system. In the DSCMA a modified version of LAS codes called LAS even ternary (LAS-ET) codes is proposed. These codes are used together with a novel algorithm called dynamic space code (DSC), which will decrease the code length so that the spectrum efficiency can be increased. By taking advantage of dynamic code reuse assignment in spatial diversity, the spectrum efficiency of the DSCMA can be further increased significantly. Springer 2010 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/11429/1/Spectrum%20Efficiency%20Enhancement%20in%20Dynamic%20Space%20Coded%20Multiple%20Access.pdf Ng, Chee Kyun and Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Jamuar, Sudhanshu Shekhar and Ismail, Mahamod (2010) Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system. Wireless Personal Communications, 53 (2). pp. 253-267. ISSN 0929-6212; ESSN: 1572-834X 10.1007/s11277-009-9682-7 |
| spellingShingle | Ng, Chee Kyun Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title | Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title_full | Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title_fullStr | Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title_full_unstemmed | Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title_short | Spectrum efficiency enhancement in dynamic space coded multiple access (DSCMA) system |
| title_sort | spectrum efficiency enhancement in dynamic space coded multiple access dscma system |
| url | http://psasir.upm.edu.my/id/eprint/11429/1/Spectrum%20Efficiency%20Enhancement%20in%20Dynamic%20Space%20Coded%20Multiple%20Access.pdf |
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