倾斜天线蜂窝系统的双向信道优化模型

地面基站天线倾斜是提高CDMA蜂窝系统容量和平衡小区负载的有效方法之一.本文通过对倾斜天线蜂窝系统的切换问题的研究,提出了在计算系统容量时,同时考虑前向信道和反向信道的双向信道分析方法,使得系统容量的计算更为合理.利用这一模型,得出了在用户均匀分布和非均匀分布情况下的最佳天线倾斜角度.仿真结果表明,利用本文的方法,系统的实际容量比单独考虑反向信道时有显著的提高.

Capacity optimization with integrated channel model for cellular systems with tilted array

The tilted-antenna mechanism is an effective way to balance the traffic and improve the capacity of CDMA cellular system. Through the investigation of handoff problem in the fixed tilted-antenna mechanism, a new model of analyzing the system capacity is presented, in which the quality of the integrated channel is considered. Because of integrating both the forward link and reverse link into consideration, the proposed method consequently can lead to much more reasonable results of the system capacity. Optimized tilted angles of the antenna of a base station, under the condition of uniform or non-uniform user distributions, are investigated. The simulation results show that by the new model, the actual system capacity can be greatly improved compared with the results by the model with the reverse link only.