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In this paper we study the problem of relay-enhanced cell (REC) coverage for which relay location is optimized to maximize the achievable REC radius. The problem is investigated for both Rayleigh and Rician relay fading channels, under a pre-determined user's outage probability constraint. We propose a statistical approach to formulate the problem and develop an optimization algorithm for it. The...
In single relay non-cooperative amplify-and-forward (AaF) system, taking into account both long-term path loss and short-term Rayleigh fading, a closed form expression to distribute total power optimally among source and relay is obtained, which minimize end-to-end BER. The simulation results under various channel conditions and scenarios show that it is consistent with theoretical analysis, and optimal...
In this paper we analyze the end-to-end capacity of subcarrier pairing strageties of OFDMA-base DF relay link over Rayleigh fading channels. We compare fixed pairing strategy to optimal pairing strategy in the circumstance that the relay is fixed or mobile.The main contribution of this paper is deriving the closed-form expressions for average end-to-end SNR and capacity in these circumstances. The...
In this paper, power minimization for Poisson distributed random relay networks in Rayleigh fading channels is considered. We investigate two power allocation methods; one is a minimum power allocation (MPA) strategy and the other is an equal outage power allocation (EOPA) strategy. We analyze the total transmit power of two allocation methods under the given end-to-end outage probability constraint...
This paper considers the Gaussian multiple access channel (MAC) assisted by N parallel relays. For the channel, the rate region with decode-and-forward is derived, considering both full-duplex and half-duplex relaying. The asymptotic sum-rate of the channel, under Rayleigh-distributed fading, is also presented. We prove that the sum-rate of the MAC with D&F relays converges almost surely to the...
In this paper, we investigate performance of cooperative diversity techniques for inter-vehicular communication. The channel model used in this system is cascaded Rayleigh which provides a realistic description of inter-vehicular channel where two or more independent Rayleigh processes are assumed to be generated by independent groups of scatterers around the two mobile terminals. In this paper, we...
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