Ni Na Wang

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—In this paper, we present a sparse channel estimation method for orthogonal frequency division multiplexing (OFDM) based two-way relay networks (TWRN). Conventional channel estimation methods, such as least squares (LS), have been proposed to obtain channel state information (CSI) at the cost of the training resource, which reduce spectrum efficiency.(More)
BACKGROUND AND PURPOSE Persons who perceive their risk for stroke can promote the intervention of stroke risk factors and reduce the risk of stroke occurrence. Our purpose was to assess the knowledge of stroke risk factors and the level of perceived risk for stroke. METHODS In 2011, a population-based face-to-face interview survey was conducted in Yuzhong(More)
BACKGROUND AND PURPOSE Thrombolytic therapy rate for acute ischemic stroke remains low, and improving public awareness of thrombolytic therapy may be helpful to reduce delay and increase chances of thrombolytic therapy. Our purpose was to survey the level of knowledge about thrombolytic therapy for acute ischemic stroke among community residents in Yuzhong(More)
Broadband wireless channels are often time dispersive and become strongly frequency selective in delay spread domain. Commonly, these channels are composed of a few dominant coefficients and a large part of coefficients are approximately zero or under noise floor. To exploit sparsity of multi-path channels (MPCs), there are various methods have been(More)
OBJECTIVE To observe and analyze the application effect of ultrasound-guided modified Seldinger technique (MST) in Peripherally Inserted Central Catheter (PICC) catheterization. METHODS Two hundred patients treated with PICC catheterization from January 2013 to December 2015 were selected and randomly divided into two groups, namely, observation group and(More)
BACKGROUND AND PURPOSE This study aimed to investigate the knowledge of community general practitioners (GPs) and nurses about pre-hospital stroke recognition, treatment and management and secondary stroke prevention; to identify the sociodemographic and educational factors influencing knowledge. METHODS A self-designed test questionnaire was applied in a(More)
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