Abstract:

The design of stair emergency communication system vitally depends on the stair channel model. However, the signal multi-cluster characteristic has a significant impact on channel modeling, thus a novel stochastic multi-cluster Channel Impulse Response（CIR） model is proposed. The cluster arrival time is distance-dependent under the Line of Sight （LOS） environments. On the contrary, the arrival time of each cluster is irrelevant to the distance for the Non LOS （NLOS） cases. Each cluster of the CIR can be described by an exponential decay function, and the decay constant for each cluster is further found to be related to the distance. Extensive channel measurements are performed to prove the accuracy of the proposed model. The S-V model is also introduced for a comparison. Results show that the proposed model is more suitable for describing the propagation characteristics under indoor stair environments.

Key words: channel model, multi-cluster, Channel Impulse Response（CIR） model, exponential decay

摘要：

楼梯信道模型是设计楼梯应急通信系统的关键，而信号多簇特性对信道建模具有重要影响，对此提出了新的随机多簇信道冲击响应（Channel Impulse Response，CIR）模型。对于视距（Line of Sight，LOS）环境，提出用距离相关函数拟合簇到达时间。而非视距（Non LOS，NLOS）环境下，簇到达时间与距离无关。CIR中每个簇用指数衰减函数描述，其中衰减常量随距离变化。最后用实测数据验证所提出模型的准确性，并用S-V模型作比较。结果表明，所提出模型更适合描述室内楼梯传播特性。

关键词: 信道模型, 多簇, 信道冲击响应（CIR）模型, 指数衰减