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This paper investigates the effect of the transmit power fluctuation of the primary user on the ergodic capacity of the secondary user in a spectrum sharing environment. Considering an average received-power constraint at the primary user receiver, we derive the closed-form expression for the ergodic capacity of the secondary user and the average received-power assuming Rayleigh fading channels. Numerical...
In this paper, we investigate a mobility procedure for mode II personal/portable TV Band Devices (TVBDs). There is a possibility of forced termination probability (FTP) or blocking probability (BP) in the TV White Space (TVWS) while portable TVBDs are moving. This is because the availability of TVWS is dependent on the location and time schedule of licensed devices and other unlicensed networks. In...
In this paper, we propose a new detection algorithm for single carrier-frequency division multiple access (SC-FDMA) systems called duo maximum likelihood detector with transmit power allocation (DMLD-TPA). The proposed scheme is based on iteratively detecting two symbols out of Q transmit symbols by an orthogonal projection. It can make the detection complexity less than that of the maximum likelihood...
This paper evaluates the achievable transmission capacity of the secondary system in cognitive radio networks, defined by the spatial density of successful transmissions while guaranteeing the target outage probabilities of the secondary and the primary systems. By using stochastic geometry, the effects of the spatial densities and the transmission powers on the achievable transmission capacity is...
Most existing works on orthogonal frequency division multiple access (OFDMA) multihop cellular networks have assumed half-duplex relay, which suffers from spectral inefficiency since it requires additional resources for relaying. In order to alleviate this half-duplex loss, a new relay transmission scheme using dirty paper coding (DPC) is proposed. By alternately forwarding the messages to two mobile...
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