CODE DIVISION MULTIPLE ACCESS (CDMA) MODEM

• Main Authors: OZLUTURK FATIH, LOMP GARY, SILVERBERG AVI
• Format: Patent
• Language: English
• Published: 04.07.2013
• 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 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.