基于簇和径统计特征的超宽带离散信道模型

Discrete time ultra-wideband channel model based on statistical properties of cluster and ray arrivals

基于超宽带(UWB)信号传播中簇信号和径信号的统计特征,将簇和径的传播过程描述为各自独立的离散泊松过程,并根据不同的信道环境及簇和径的信道增益系数确定离散时间间隔以及信号幅度,由此得出一个二维的离散信道冲击响应表达式,给出一种超宽带离散信道模型的建立方法.利用该模型可以推导出超宽带信道的功率衰减轮廓(PDP)表达式.仿真结果表明,该离散信道模型可以更好地评估超宽带的信道特征,运用新的离散模型推导得到的PDP与IEEE 802.15.3a给出的PDP有着很好的一致性.

Based on the statistical properties of cluster and ray arrivals, the propagation processes of cluster and ray in UWB signals were respectively described as a discrete Poisson process. The discrete time interval of each process was determined dynamically according to different environments, and the amplitudes of the arrived clusters and rays were obtained with the cluster gain coefficient and the ray gain coefficient. A 2-D discrete impulse response expression for the model was concluded and a new method for building the discrete time UWB channel model was proposed. The new model can be used to get the expression of power decay profile （PDP）. The simulation showed that the method can provide a good UWB channel discrete model in the estimation of channel characteristics. The PDP given in IEEE 802.15.3a and the PDP plotted from the new model had a fine consistency.