th its powerful antijam properties, multiple users can transmit on the same frequency with only some minimal interference one to another. This assumes that each user is employing a different key variable (i.e., in essence, using a different time code). At the receiver, the CDMA signals are separated using a correlator that accepts only signal energy from the selected key variable binary sequence (code) used at the transmitter and then despreads its spectrum. CDMA signals with unmatching codes are not despread and only contribute to the random noise. CDMA reportedly provides an increase in capacity 15 times that of its analog FM counterpart. It can handle any digital format at the specified input bit rate such as facsimile, data, and paging. In addition, the amount of transmitter power required to overcome interference is comparatively low when utilizing CDMA. This translates into savings on infrastructure (cell site) equipment and longer battery life for hand-held terminals. CDMA also provides so-called soft handoffs from cell site to cell site that make the transition virtually inaudible to the user (Ref. 12). Dixon (Ref. 14) lists some advantages of the spread spectrum: 1. Selective addressing capability 2. Code division multiplexing is possible for multiple access 3. Low-density power spectrum for signal hiding 4. Message security 5. Interference rejection Of most importance for the cellular user (Ref. 13), "when codes are properly chosen for low cross correlation, minimum interference occurs between users, and receivers set to use different codes are reached only by transmitters sending the correct code. Thus more than one signal can be unambiguously transmitted at the same frequency and at the same time; selective addressing and code-division multiplexing are implemented by the coded modulation format." Processing gain is probably the most commonly used parameter to describe the perfor- mance of a spread spectrum system. It quantifies the signal-to-noise ratio improvement when a spread signal is passed throu