Effect of transmit power limitation in power controlled DS-CDMA

In DS-CDMA mobile communications systems, transmit power control (TPC) is an indispensable technique on the reverse (mobile-to-base) links to minimize the received signal power variations produced by multipath fading, shadowing, and distance dependent path loss. However, a large transmit power is sometimes required with TPC. This is an undesirable burden for a mobile station because the transmit power amplifier must have a fairly wide range of linearity. Furthermore, in the case of cellular systems, a large interference is produced to other cells, thereby reducing reverse link capacity. In this paper, we study the effect of the mobile transmitter power limitation on the transmission performance and the required transmit power that is directly related to the other cell interference.