A system and method for processing a received Global Positioning System (GPS) signal into a processed position finding GPS signal and for processing a first and a second input signal jointly with the GPS signal. A modulator and transmitter for modulation and transmission of processed signals in cellular...http://www.google.com.hk/patents/US20080214164?utm_source=gb-gplus-share專利 US20080214164 - Transmission of Signals in Cellular Systems and in Mobile Networks
