Introducing power-shaped advanced resource assignment (PSARA) in fixed broadband wireless access systems

In this paper we propose a new technique for assigning radio channels in TDMA-based fixed broadband wireless access systems (FBWA) with full frequency reuse. The proposed technique, named Power-Shaped Advanced Resource Assignement (PSARA), has the aim of partially organizing the intercell and intersector interference in a cellular system where base stations assign radio resources in an uncoordinated fashion. This is done by using an appropriate set of power profiles that limit (or shape) the power transmitted in each slot of the frame. The allocation algorithm assigns time slots to users on the basis of the power required to fulfill a predefined carrier-to-interference ratio, which is suitably estimated. Simulation results for a typical cellular FBWA system show that this technique significantly improves the capacity with respect to a system that assigns resources without power shaping, even with power control.