A dual-mode mobile station (125) transmits an AMPS signal (Td AMPS) concurrently during transmission of a DS CDMA signal (Td DS CDMA) for purposes of handoff of the mobile station from the DS CDMA system to AMPS. Scanning receivers (221) at surrounding AMPS base-stations (135-138) measure the quality...http://www.google.com/patents/US5974319?utm_source=gb-gplus-sharePatent US5974319 - Transmission and reception of signals in a communication systems
