Abstract
Spreading codes are an essential component of the operation of a direct sequence code division multiple access (DS-CDMA) system. The need for efficient assignment of spreading codes to transmitters can arise for two reasons. Firstly, if the number of codes available is less than the number of users, then the codes must be assigned to achieve satisfactory re-use distances. Secondly, if the correlation properties of code pairs differ from pair to pair, then assignment can be used to ensure that close users have the best correlation properties. Many code classes (e.g. Gold codes) do not display this variation from pair to pair, but others (particularly those designed for quasisynchronous operation) do. The variation can he exploited to improve the overall performance.
In this paper an adaption to code assignment of the type of algorithm used for frequency assignment is described, and the potential benefits explored.
In this paper an adaption to code assignment of the type of algorithm used for frequency assignment is described, and the potential benefits explored.
| Original language | English |
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| Title of host publication | Proceedings of IEEE Conference on Ultra Wideband Systems and Technologies, 2003 |
| Publisher | Institute of Electrical and Electronics Engineers |
| Number of pages | 5 |
| ISBN (Print) | 0-7803-8187-4 |
| DOIs | |
| Publication status | Published - 3 Mar 2004 |
| Event | IEEE Conference on Ultra Wideband Systems and Technologies, 2003 - Hyatt Regency, Reston, United States Duration: 16 Nov 2003 → 19 Nov 2003 |
Conference
| Conference | IEEE Conference on Ultra Wideband Systems and Technologies, 2003 |
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| Country/Territory | United States |
| City | Reston |
| Period | 16/11/03 → 19/11/03 |