A spread spectrum radiocommunication device includes a plurality of digital data demodulators which are independently operated to track the paths of a multipath radio signal transmitted from a to-be-communicated device and PN code generators each of which has a ROM storing PN codes and which are respectively...http://www.google.fr/patents/US5940432?utm_source=gb-gplus-shareBrevet US5940432 - Spread spectrum radiocommunication device utilizing rake reception scheme
