A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code generator, a receiver-generic mixer, a generic-bandpass...http://www.google.de/patents/US5228056?utm_source=gb-gplus-sharePatent US5228056 - Synchronous spread-spectrum communications system and method
