CODE DIVISION MULTIPLE ACCESS (CDMA) MODEM

• Main Authors: OZLUTURK FATIH, LOMP GARY, SILVERBERG AVI
• Format: Patent
• Language: English
• Published: 15.09.2011
• Subjects: BASIC ELECTRONIC CIRCUITRY; CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; JAMMING OF COMMUNICATION; MULTIPLEX COMMUNICATION; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PULSE TECHNIQUE; RESONATORS; SECRET COMMUNICATION; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

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. COPYRIGHT: (C)2011,JPO&INPIT