DocumentCode :
459652
Title :
An Interference Avoidance Code Assignment Strategy for Multi-Rate MC-DS-CDMA with Time-and Frequency-Domain Spreading
Author :
Wang, Li-Chun ; Chang, Chih-Wen ; Huang, Howard
Author_Institution :
Department of Communication Engineering, National Chiao Tung University, 1001 Ta-Hsueh Rd, Hsinchu 300, Taiwan. Email: lichun@cc.nctu.edu.tw
Volume :
11
fYear :
2006
fDate :
11-15 June 2006
Firstpage :
4894
Lastpage :
4899
Abstract :
Multi-carrier direct sequence code division multiple access (MC-DS-CDMA) systems can support multi-rate services with a great deal of flexibility by dynamically changing time-and frequency-domain spreading gains. However, in a frequency-selective fading channel, the multi-rate users using the time spreading codes with an ancestor-to-child relation, even with orthogonal frequency spreading codes, may still be affected by different quantities of multiple access interference (MAI). How to design an effective radio resource management strategy for the MC-DS-CDMA systems subject to different levels of MAIs becomes a new and important issue. In this paper, based on the error rate analysis in the physical layer, we observe and define a new performance metric, called the MAI coefficient, which can quantitatively predict the MAI effect imposed on a particular code in a multi-rate MC-DS-CDMA system. Furthermore, from the radio resource management perspective, we develop an interference avoidance code assignment scheme based on the MAI coefficient. By simulations and analysis, we demonstrate that the proposed interference avoidance code assignment method can effectively reduce the MAI in a multi-rate MC-DS-CDMA system, while maintaining very good call blocking rate performance.
Keywords :
Analytical models; Direct-sequence code-division multiple access; Error analysis; Frequency; Frequency-selective fading channels; Measurement; Multiple access interference; Performance analysis; Physical layer; Resource management;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2006. ICC '06. IEEE International Conference on
Conference_Location :
Istanbul
ISSN :
8164-9547
Print_ISBN :
1-4244-0355-3
Electronic_ISBN :
8164-9547
Type :
conf
DOI :
10.1109/ICC.2006.255440
Filename :
4024824
Link To Document :
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