Binary Power Control for Sum Rate Maximization over Multiple Interfering Links

We consider allocating the transmit powers for a wireless multi-link (N-link) system, in order to maximize the total system throughput under interference and noise impairments, and short term power constraints. Employing dynamic spectral reuse, we allow for centralized control. In the two-link case, the optimal power allocation then has a remarkably simple nature termed binary power control: Depending on the noise and channel gains, assign full power to one link and minimum to the other, or full power on both. Binary power control (BPC) has the advantage of leading towards simpler or even distributed power control algorithms. For N > 2 we propose a strategy based on checking the corners of the domain resulting from the power constraints to perform BPC. We identify scenarios in which binary power allocation can be proven optimal also for arbitrary N. Furthermore, in the general setting for N > 2, simulations demonstrate that a throughput performance with negligible loss, compared ...

• Type: Journal
• Year: 2008
• Where: TWC
• Authors: Anders Gjendemsjø, David Gesbert, Geir E. Øien, Saad G. Kiani
• Keywords: Binary Power, Binary Power Control, Power Allocation, TWC 2008