Cognitive pilot channel: Enabler for radio systems coexistence

With an increasing number of collocated personal, local and cellular wireless communication systems, the question of optimum coexistence and inter-networking are raised. Although some mitigation techniques, like DAA, LDC, Frequency band notching etc. are being widely studied by industries, regulation bodies and standardization authorities, none of them show good performance in terms of detection and energy consumption without having a priori knowledge about the primary system which is not usually available. Cognitive radios and networks with cognitive signaling and data-aided mitigation techniques can become then key enablers for true heterogeneous communication environment with optimal sharing of the spectrum and coexistence. Cognitive pilot channel (CPC) is a novel, recently proposed approach which could guarantee a conflict-free coexistence. In this paper we show a generic scheme to achieve better coexistence between UWB and WIMAX through enhancing existing mitigation techniques.