摘要
为了进一步消除码分多址系统中的多址干扰,提出了基于功率控制与非理想串行干扰消除(SIC)技术相结合的功率控制模型.该模型对传统的理想SIC算法进行了改进,即考虑到前级信号未完全消除和无线信道的实时变化,定义了残余功率与用户接收到的功率成正比,同时引入链路估计误差.通过求解信干比方程得到了链路估计误差对呼损率和功率的制约关系.该算法部分克服了理想SIC算法在链路增益变化时不能很好地维持用户的目标信干比的问题.仿真结果表明,随着估计误差的偏大,系统的呼损率性能急剧恶化,而对功率的影响则不显著.在链路估计方差为0 2和1时,非理想IC算法比理想IC算法的呼损率性能改善了2 7倍和1 5倍.
A power control algorithm for wireless multi-rate code division multiple access systems with imperfect successive interference cancellation (SIC) is discussed in order to reduce multiple access interferences. The algorithm considers the remaining power of interference, which is proportional to the received power, and the ceaseless change of channel gain resulting in the estimate error of channel gain. The relationship of the estimate error of channel gains to the outage rates and the power of system is obtained. The algorithm partly improves the performance of user's outage rate by using perfect SICCPSIC). Simulation shows that the performance of outage rates is deteriorated rapidly resulting from the increase of the estimate error of channel gain, while the sensitivity of the outage rates is not in evidence for the variety of remaining coefficient. The rate of outage-rate of ISIC and that of PSTC is 2.7 and 1.5 if the deviation is 0.2 and 1, respectively.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2003年第10期1079-1082,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(69672017
60072040)
国家"八六三"计划资助项目(2001AA123041)
西安交通大学重点培植项目(PZ007).
关键词
码分多址
功率控制
干扰消除
移动通信
Algorithms
Interference suppression
Mobile telecommunication systems
Normal distribution
Power control