For spread spectrum communication using a frequency hopping method, this invention is to provide a method and an apparatus for two-way simultaneous communication for transmitting/receiving with a compact circuit and without lowering a transmission rate. Data to be transmitted is encoded by an...http://www.google.com/patents/US5715275?utm_source=gb-gplus-sharePatent US5715275 - Spectrum communication method and apparatus for delaying read sequence series 
