A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread information signals along with a second PN spreading code sequence or function. The second PN code is synchronized...http://www.google.com/patents/US6493376?utm_source=gb-gplus-sharePatent US6493376 - Multi-layered PN code spreading in a multi-user communications system
