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In this paper, a novel detection criterion is proposed to decide whether primary user (PU) exists based on joint analysis of the variance and correlation for observation signal, considering a correlation within the observed signal. Simultaneously, the corresponding detection thresholds are also designed. Simulation experiments verify the proposed method suits for the observation signal in Additive...
Energy detection is one of the spectrum sensing techniques in the cognitive radio system that facilitate to detect vacancies in spectrum frequency. In order to improve the detection performance of the primary user and overcome the shortcomings of the traditional energy detection algorithm, this paper proposes an improved energy detection algorithm based on signal correlation (SCED). This algorithm...
The traditional channel estimation based on Discrete Fourier Transform (DFT) for Orthogonal Frequency Division Multiplexing (OFDM) system has significantly outperformed least square (LS) or minimum mean-square error (MMSE) channel estimation by eliminating the impact of noise beyond the maximum channel delay. However, its performance is degraded due to the presence of set correlations among the basis...
In Advanced Long Time Evolution (LTE-A) mobile wireless communication system, the Carrier Aggregation (CA) technique feature was introduced to support large transmission bandwidth. But due to the capacity limit of UE, to measure all component carriers with low latency and cost has been a challenge. In this paper a solution is presented in which only some reference component carriers need to be measured;...
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