Achieving maximal sum-rate capacity of two-way cognitive radio with relays operating in separate bands through MO
In this paper, we study a cognitive radio network comprising a pair of sources and multiple relays operating in non-overlapping bands in the radio spectrum. We address the problem of deciding the transmission powers of the sources and relays so that the sum of the sources' transmission capacities is maximized. Due to the non-overlapping nature of the relays' signals, the problem can be represented as a constrained optimization over two variables, but such formulation results in a non-convex optimization. We transform this problem to an equivalent optimization problem over three variables for which the monotonic optimization (MO) can be employed. We discuss an algorithm that is guaranteed to terminate with an ε-optimal solution.