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This paper proposes a unique discovery signal as an enabler of peer-to-peer(P2P) communication which overlays a cellular network and shares its resources.Applying P2P communication to cellular network has two key issues: 1.Conventional ad hoc P2P connections may be unstable since stringent resourceand interference coordination is usually difficult to achieve for ad hoc P2Pcommunications; 2. The large overhead required by P2P communication may offsetits gain. We solve these two issues by using a special discovery signal to aidcellular network-supervised resource sharing and interference managementbetween cellular and P2P connections. The discovery signal, which facilitatesefficient neighbor discovery in a cellular system, consists of un-modulatedtones transmitted on a sequence of OFDM symbols. This discovery signal not onlypossesses the properties of high power efficiency, high interference tolerance,and freedom from near-far effects, but also has minimal overhead. A practicaldiscovery-signal-based P2P in an OFDMA cellular system is also proposed.Numerical results are presented which show the potential of improving localservice and edge device performance in a cellular network.

Discovery Signal Design and Its Application to Peer-to-Peer Communications in OFDMA Cellular Networks