1.引言未来的个人通信业务(PCS)依赖于微蜂窝概念,以便提高无线电频谱的效率。使用低天线(大约与路灯柱相同的高度)和发射低功率(典型的是10mW量级)时,为了在短的无线电路径上(200～1000m量级)进行操作,提出了一些新的微蜂窝系统。在现有的微蜂窝系统中,蜂房分隔在密集的城市已达到了它的极限,这是由于较适合的蜂房位置是不可用 1. INTRODUCTION The future of personal communications services (PCS) relies on the concept of microcells to increase the efficiency of the radio spectrum. In order to operate on a short radio path (on the order of 200-1000 m) using a low antenna (about the same height as a lamppost) and emitting a low power (typically on the order of 10 mW), several new microcells have been proposed system. In existing micro-cellular systems, the separation of hives in dense cities has reached its limit due to the more suitable hive location not available