CODE DIVISION MULTIPLE ACCESS (CDMA) MODEM

摘要

PROBLEM TO BE SOLVED: To provide a code division multiple access (CDMA) modem for a spread spectrum communication system, which transmits and receives a communication signal including an information signal and a connection control signal through a transmission channel and a reception channel respectively having first and second pilot code signals synchronized with each other.SOLUTION: This CDMA modem includes a modem transmitter having: a code generator that generates an associated pilot code signal and also generates a plurality of message code signals; spreading means that generates a message signal subjected to spread spectrum processing, by combining the information signals with the respective message code signals; and a global pilot code generator that generates a global pilot code signal which is a synchronization reference of the message code signals. This CDMA modem also includes a modem receiver having: an associated pilot code generator; and a group of associated pilot code correlators for correlating a code-phase delayed output of the associated pilot signal with a reception CDMA signal to produce a spread associated pilot signal.