ath present nor any particular advantage CDMA has in dealing with it. We call the forward direction a one-to-many broadcast environment. In the one-to- many environment, the rake filter can reduce the damage of multipath, but each in- terferer is amplified by the same coherent addition plus time sidelobes as the signal. The reverse direction is the opposite, a many-to-one environment. This gives us an advantage in the resolution of multipath because the interferers do not have the same delay spread as the signal. The example of three equal paths in the reverse direction gives the same results for the signal path as in the forward direction. The receiver gets one triple-amplitude sig- nal, nine power units, and six time sidelobes. It is the interferers that have changed in this picture. In this example, the interferer also has three equal paths from the transmitter to the receiver, but those paths have spacing different from the signal paths. Thus, when the signal rake filter triples the interferer, each of its three paths appears three times for a total of nine occurrences of one power unit each. These nine power units of interference are a perfect match for the nine power units of the triple-amplitude signal. The time sidelobes of the signal are the only cost, just two-thirds of a single channel, no matter how many interferers there are. The reverse multipath many-to-one picture is brighter than the forward one-to-many picture. With perfectly uncorrelated multipath and a perfect rake filter, the interfer- ence cost of each interferer is no worse than it is in the single-path case. The only de- structive effects of multipath are the time sidelobes of the signal. 8.5 CDMA Power Control All the analysis up to here has been based on setting CDMA power levels to be equal for each call, each PN code, with absolute certainty. Some calls are much closer to the serving antenna than others and have much higher radio path gains. We call this 9The absence or presence of radio multipath is not a system design parameter but a