標題: An Interference Avoidance Code Assignment Strategy for Multi-Rate MC-DS-CDMA with Time- and Frequency-Domain Spreading
作者: Wang, Li-Chun
Chang, Chih-Wen
Huang, Howard
電信工程研究所
Institute of Communications Engineering
公開日期: 2006
摘要: 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.
URI: http://hdl.handle.net/11536/17211
ISBN: 978-1-4244-0354-7
ISSN: 1550-3607
期刊: 2006 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-12
起始頁: 4894
結束頁: 4899
顯示於類別:會議論文