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In this paper, we study spectrum overlay access to share spectrum between primary users (PUs) and secondary users (SUs). Our goal is to maximize the average throughput by optimal power allocation within finite time duration. To do this, we formulate this optimization problem as a Markov Decision Process with continuous state. An approximate value method with pre-allocation mechanism is proposed, which...
The time delay estimation (TDE) of some known waveforms from sampled data is of great interest in the area of signal processing, e.g., wireless communication, radar, and sonar. Classical algorithms, such as matched filters, multiple signal classification always work under the Nyquist sampling rate determined by the bandwidth of the waveform. With the assumption of sparsity, the novel compressive sensing...
In this paper, a novel particle swarm optimizer is developed by introducing projection operators described by projection matrices into the algorithm. Under the projection operators, the particles will oscillate along the directions determined by the projection operators to enhance global explorations. At the same time, the particles explore locally the optimal solutions when they are close to the...
Inter-thread interferences in shared caches can significantly affect the worst-case execution time (WCET) of real-time tasks running on multi-core chips. In this paper, we study three multicore-aware code positioning methods to reduce the inter-core L2 cache interferences between co-running real-time threads. One strategy focuses on decreasing the longest WCET among the co-running threads, and two...
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