| Presentation | 2005-03-18 Code Acquisition in Asynchronous DS/CDMA Systems Tahir Abbas Khan, Nobuoki Eshima, Yutaka Jitsumatsu, Tohru Kohda, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Synchronized users signals are subtracted from received signal at the base station of a direct sequence code division multiple access (DS/CDMA) system to aid code acquisition of new users. Expressions for expectation and variance of the correlator output corresponding to a synchronization chip and otherwise are derived for the asynchronous environment. A novel detector based on a posteriori probability threshold rule is proposed for code acquisition. Computer simulations show significant performance improvements over conventional code acquisition methods. The technique is also applicable for signals modulated by Markov codes and computer simulations show superiority of Markov codes over independent and identically distributed (i.i.d.) codes. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | CDMA / Asynchronous / Code acquisition / a posteriori probability / Markov codes / i.i.d. codes |
| Paper # | IT2004-76,ISEC2004-132,WBS2004-191 |
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| Conference Information | |
| Committee | ISEC |
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| Conference Date | 2005/3/11(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Information Security (ISEC) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Code Acquisition in Asynchronous DS/CDMA Systems |
| Sub Title (in English) | |
| Keyword(1) | CDMA |
| Keyword(2) | Asynchronous |
| Keyword(3) | Code acquisition |
| Keyword(4) | a posteriori probability |
| Keyword(5) | Markov codes |
| Keyword(6) | i.i.d. codes |
| 1st Author's Name | Tahir Abbas Khan |
| 1st Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University() |
| 2nd Author's Name | Nobuoki Eshima |
| 2nd Author's Affiliation | Department of Medical Information Analysis, Oita University |
| 3rd Author's Name | Yutaka Jitsumatsu |
| 3rd Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University |
| 4th Author's Name | Tohru Kohda |
| 4th Author's Affiliation | Department of Computer Science and Communication Engineering, Kyushu University |
| Date | 2005-03-18 |
| Paper # | IT2004-76,ISEC2004-132,WBS2004-191 |
| Volume (vol) | vol.104 |
| Number (no) | 732 |
| Page | pp.pp.- |
| #Pages | 5 |
| Date of Issue | |