Power Control for Coded Frequency Hopping Cellular Systems
Kai-Erik Sunell, Jens Zander · 1998
Transmitter power control has proven to be a powerful technique to control interference and improve the performance of wireless networks. Efficient power control normally requires fast and reliable quality measurements. In cellular systems where propagation and interference conditions vary rapidly, such real-time measurements cannot be obtained. Instead, diversity techniques can be useful. Frequency hopping combined with error control coding is an example how this diversity can be implemented. These systems effectively "average" the interference. How power control should be applied in these systems is, however, not obvious. In this paper, we show that symbol error performance in the uplink of a coded frequency hopping cellular system is, at least in principle, minimized by maintaining the received signal power at a constant level, provided that accurate instantaneous measurements are available. When such instantaneous measurements are not available, but only time averages this is no lo...