A multipoint-to-point CDMA communication system comprises a plurality of CDMA transmitting stations and a single CDMA receiving station, all of which are intercoupled to each other over one CDMA channel and one feedback channel. On the one CDMA channel, the plurality of CDMA transmitting stations simultaneously...http://www.google.com/patents/US5499236?utm_source=gb-gplus-sharePatent US5499236 - Synchronous multipoint-to-point CDMA communication system
