Robust Power Allocation in Cognitive Radio Networks With Uncertain Knowledge of Interference
Hyang-Won Lee, Jeongho Kwak, Long Bao Le · IEEE Wireless Communications Letters · 2016
We study the secondary user power allocation problem in cognitive radio networks with uncertain knowledge of interference information. We capture the channel uncertainty in the chance-constrained formulation where interference to primary users is guaranteed to be below a given threshold with high probability. However, the formulation is nonconvex, hence, we approximate the nonconvex problem with a safe convex problem by invoking robust optimization theory. Via extensive simulations under various channel conditions, we verify that our power allocation design based on the chance-constrained formulation guarantees interference constraint with high probability while enlarging the feasible region of secondary user's power.