A wireless OCDMA communication system in which there is a cluster of base stations (BS), or radio fixed parts (RFP), which may in turn be controlled by a wireless cluster controller (WCC). The system uses frames of a time division duplex spread spectrum signal for two-way voice and/or data transmission,...http://www.google.com.hk/patents/US5748610?utm_source=gb-gplus-share專利 US5748610 - Multi-application wireless direct sequence spread spectrum digital cellular telephone system 
