Mc Ch6

This document discusses multiple access techniques for mobile communications, including Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), and Code Division Multiple Access (CDMA). It provides details on how each technique works, such as FDMA assigning each subscriber a specific frequency channel to avoid interference, TDMA giving each user a short time slot to transmit within to share a frequency channel, and CDMA using special codes to allow numerous signals to occupy a single channel simultaneously while maintaining privacy. The document also summarizes the key steps in generating a CDMA signal, including analog to digital conversion, voice compression, encoding, channelization, and conversion to a radio frequency for transmission.