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 receiving channel respectively having first and second pilot code signals synchronized each other.

SOLUTION: A 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; a spreading means that generates a spread-spectrum message signal by combining each of the information signals with a respective one of the message code signals; and a global pilot code generator that generates a global pilot code signal to which the message code signals are synchronized. The 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 receive CDMA signal to produce a despread associated pilot signal.

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