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This paper considers a downlink nonorthogonal multiple access (NOMA) system where the source intends to transmit independent information to the users at target data rates under statistical channel state information. The outage balancing problem is studied with the issues of power allocation, decoding order selection, and user grouping being taken into account. Specifically, with regard to the max–min...
Efficient spectrum detection is essential to Cognitive Radio systems. In this paper, a novel spectrum detection method based on Bayesian compressed sampling is proposed. Firstly, the sparsity of the received signal under fading channel is studied. Then, Bayesian compressed sampling(BCS) is introduced to the spectrum detection for wideband cognitive radio system, and the spectrum components can be...
This paper addresses two issues about spectrum sensing in heterogenous wireless networks (HWNs). One is the optimization of spectrum sensing periods. The other is the efficient scheduling between sensing periods and transmission periods. The optimal programming to maximize the achievable throughput for the unlicensed users with licensed users sufficiently protected is used to get the solution for...
In a fading environment, a secondary user may opportunistically transmit with high power when its signal received by the primary receiver is deeply faded. The spectrum access gain can be obtained when there is perfect knowledge of channel sensing at both primary and secondary receivers. In this paper, we investigate the case of imperfect knowledge of channel sensing and explore the impacts on spectrum...
Propagation properties of transient electromagnetic pulses, or ultra-wideband (UWB) pulses, are very important for UWB radio communication technology. General characteristics of UWB pulses are studied. The phase properties and the issues of waveform distortion are discussed further. Because of the complexity of phase properties of UWB signals, the analytic methods in time domain are preferred. The...
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