DIRECT-SEQUENCE CDMA POWER-CONTROL, INTERLEAVING, AND CODING

We develop and analyze models of power control working with other aspects of CDMA systems, such as interleaving and coding on the land/mobile radio channel. Our orientation is that a power control scheme is keeping the received powers at the base station ''almost equal,'' and we will be quantifying the performance degradation incurred if the powers are not exactly equal. In doing so, we consider the performance implications of control latency and a maximum speech delay constraint. It turns out that because of positive correlations between the fading channel amplitudes, the effectiveness of the combination of interleaving and coding in combating the effects of power variations due to slow Rayleigh fading is reduced. It is shown however, that power control and interleaving/coding are most effective in complementary parameter regions, thus providing a degree of robustness for both fast and slow Rayleigh fading.