Cellular telephone service using spread spectrum transmission

摘要: A spread spectrum processing system that employs wide bandwidth radio transmissions overlaid over the existing cellular voice signals to simultaneously provide additional services without causing objectionable interference current users of channel. The also support a large number low rate digital messages. Both vehicle location and messaging functions are obtained sacrificing any channel capacity. cell site processor is designed share frequencies, real estate, antenna towers, antennas, noise amplifiers used in frequency receiver chain. only equipment signal processor. provides means for achieving accuracies improved by greater than two orders magnitude which possible band. It transmit power control transmitter combat extremely variation (dynamic range) path loss receiving sites. excising at excessively strong conventional not under ordinarily might interfere with successful reception new broadband signals.