FDMA-TDMA-CDMA: An Introduction By Dr. Ernest Simo 4.0 CODE DIVISION MULTIPLE ACCESS In CDMA systems, given a Freqency, a channel is a Code Gate. Here, a channel is defined as a Code coupled to a Frequency slice. It is a two-dimensional entity expressed as (Fi, Cj): Having a Frequency (Fi) is a necessary, but not sufficient, condition to defining a CDMA channel. Having a Code (Cj) is a necessary, but not sufficient, condition to defining a CDMA channel. We require both the Frequency and Code dimensions. CDMA may be regarded as a co-channel interference problem in the Frequency Dimension. However, this problem will be successfully managed in the Code Dimension. FDMA-TDMA-CDMA: AN INTRODUCTION By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000