【摘要】 多载波CDMA技术能够提供大的系统容量、对抗瑞利衰落和消除符号间干扰等优点,成为具有发展前景的调制技术之一。本文基于各用户服务指标(QoS)的不同,提出了一种自适应子载波分配的改进的多载波CDMA系统。通过在衰落信道下的仿真,结果表明:采用本文提出的自适应子载波分配算法的改进MC—CDMA系统较之传统的MC-CDMA系统的误码率性能有了较大程度的改善。更多还原

【Abstract】 Multicarrier code-division multiple-access is one of the effective techniques to gain its multiple access capability, robustness against fading, and to mitigate the ISI. In this paper, allowing for different quality-of-service( QoS) requirements for different users, we propose an improved mulcarrier CDMA system with adaptive subcarrier allocation. We analyzed the performance of our proposed system in frequency selective fading environment. Simulation results show that adaptive subcarrier allocation scheme,when used in conventional multicarrier CDMA system, the performance will be greatly improved.更多还原