Log-convexity of minimal feasible total power in cdma channels
Holger Boche, Sławomir Stańczak · 2004
Power control is an important mechanism for interference management in CDMA channels. When developing power control strategies, CDMA system designers need to ensure that each user meets its signal-to-interference ratio (SIR) requirement. The minimal total power at which each user meets its SIR requirement is called the minimal feasible total power (MFTP). This paper shows that MFTP is a log-convex function on the set of feasible inverse SIR requirements. This implies that the set of feasible inverse SIR requirements is a convex set.