移动通信中一种自适应时隙结构的新方法

A New Scheme for Adaptive Slot Structure in Mobile Communication Systems

在基于时分导频体制的单载波频域均衡系统平台上,我们利用有效到达径上信道参数的估计值,统计其包络的电平通过率,据此估计出时变多径信道的多普勒频移;进而利用跟踪多普勒频移变化与所需导频密度之间的关系,自适应地调整导频密度,使得通信系统在各种移动速度下都具有较高的信息传输速率和良好的接收性能。

A Single Carrier/Frequency Domain Equalization (SC/FDE) system with time multiplexed pilot channel is designed. In this system, the Doppler-shift of the time-varying multi-path channel is estimated by calculating the Level Crossing Rate (LCR) of the signal envelope with the channel coefficient estimation on the effective fingers. Based on the Doppler-shift estimation and its relationship with pilot sampling rate, the slot structure and the pilot density are adjusted adaptively, which ensure high system capacity and good receiving performance in a wide range of mobile velocities.