摘要
利用瞬时信道信息去实现MIMO系统的自适应传输,需要发射机和接收机能准确地获得当前信道信息。但随着移动通信系统载波频率的提高和移动台运动速度的增加,信道时变性增加,对于快衰落信道,通过信道估计准确获得当前信道信息是不可能的。解决这个问题的一个有效办法就是信道预测。提出将SISO系统中的信道预测技术引入到MIMO系统,结合闭环发射分集,给出预测算法,通过仿真给出性能比较,表明在快衰落信道中,它能更好地将链路自适应地快速调整到信道的真实条件,提高整个系统的性能。
In general, to implement adaptive, e transmission methods in practice, the channel state information （CSI） must be available at the transmitter. However, due to faster fading that corresponds to the grow of mobile speeds, it is very hard to get the accurate CSI of current channel. One of the effective methods is the channel prediction algorithm. This paper combines the channel prediction algorithm with closed loop transmit diversity. The result of simulation shows that it can improve the system performance for rapid fading channels.
出处
《计算机仿真》
CSCD
2008年第4期114-116,共3页
Computer Simulation
关键词
自适应传输
波束形成
闭环发射分集
信道预测
Adaptive transmission
Beam - forming
Close loop transmit diversity
Channel prediction
