On the capacity of multicode and variable spreading gain access scheme for multicarrier CDMA systems supporting multirate services with transmit power control

被引：0
|
作者：
Hu, XY [1 ]
Chew, YH [1 ]
机构：
[1] Agcy Sci Technol & Res, Inst Infocomm Res, Singapore 119613, Singapore
来源：
2004 9TH IEEE SINGAPORE INTERNATIONAL CONFERENCE ON COMMUNICATION SYSTEMS (ICCS) | 2004年
关键词：
multirate system; multicode access; VSG access; MC-CDMA; system capacity; Multiple Access Interference (MAI);
D O I：
暂无
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
In this paper, the multicode (mc) and the variable spreading gain (VSG) access schemes for asynchronous multicarrer code division multiple access (MC-CDMA) systems supporting multirate services are considered. The system capacities for these two multirate access schemes are investigated. A transmit power control is proposed to maintain the link quality and improve the system capacity. Simulation results verified the correctness of the theoretical bit-error-rate (BER) performance expressions derived for MC-CDMA systems using these access schemes. Numerical results show that mc access scheme using orthogonal Gold spreading sequences give the best performance, and its superiority increases when the ratio between the data rates of both service class increases. In case when non-orthogonal Gold codes are used, mc access scheme shows a degrading in the system capacity as compared to VSG, due to the presence of larger self-interference (SI) among the sequences used by each high rate user.
引用
收藏
页码：666 / 671
页数：6
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