A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode and microcellular mode. Selectable frequency bands include both licensed and unlicensed frequency ...http://www.google.fr/patents/US5796772?utm_source=gb-gplus-shareBrevet US5796772 - Multi-band, multi-mode spread-spectrum communication system
Multi-band, multi-mode spread-spectrum communication system
