Cognitive UWB spectrum sharing and power allocation in a multipath fading channel

In this paper we study a cognitive power allocation scheme for a fully distributed Ultra Wide Band (UWB) system. We show that the highly restricted spectrum power density and multi-user interference can be mitigated by means of a game based solution. The impact of UWB frequency selective fading on our cognitive power allocation scheme is examined and we compare our scheme with the existing iterative water filling technique. The results show that our proposed power allocation scheme is equal to or more power efficient than the iterative water filling technique in a UWB fading channel, while also converging significantly faster.