An interference avoidance code assignment strategy for downlink multi-rate MC-DS-CDMA with TF-domain spreading

被引：14
|
作者：
Wang, Li-Chun
Chang, Chih-Wen
Huang, Howard
机构：
[1] Natl Chiao Tung Univ, Dept Commun Engn, Hsinchu 300, Taiwan
[2] Natl Cheng Kung Univ, Inst Comp & Commun Engn, Tainan 701, Taiwan
[3] Alcatel Lucent Technol, Holmdel, NJ 07733 USA
来源：
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2007年 / 6卷 / 07期
关键词：
code assignment; interference avoidance; MAI coefficient; MC-DS-CDMA;
D O I：
10.1109/TWC.2007.05888
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Frequency selective fading may affect the orthogonality of the spreading codes in the multi-carrier direct sequence code division multiple access (MC-DS-CDMA) systems. In this paper, we define a new performance metric called the multiple access interference (MAI) coefficient for the MC-DS-CDMA system to quantitatively predict the impact of inter-code interference with the time- and frequency-domain spreading in a frequency selective fading channel. With the help of MAI coefficient, a novel interference avoidance code assignment strategy is proposed. By jointly considering the incurred MAI effect and the blocking probability in the code tree structure, the proposed interference avoidance code assignment method can effectively reduce the MAI for the multi-rate MC-DS-CDMA system, while maintaining very good call blocking rate performance.
引用
收藏
页码：2508 / 2518
页数：11
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