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In order to test visual acuity expediently and accurately, a test software was designed and implemented based on the characteristics of tablet computer which was suitable for home use. The software used front camera to detect distance and presented optotypes by number of pixels considering test distance and display resolution of tablet computer which was read by software automatically. The software...
The standard Blind Interference Alignment (BIA) accumulates noise levels and causes great Signal Noise Ratio (SNR) deteriorations in the condition that the received SNR is not infinite. To address such problem, we take SNR feedback into consideration. We first define SNR reduced factor, reflecting SNR reduction between the received SNR and the final SNR for decoding data streams. A heterogeneous BIA...
Ultra wideband (UWB) signal has a broad spectrum and high resolution; therefore it is potential in communication and identification areas. At present, for the communication perspective, UWB wireless sensor network (WSN) plays an important role. And for the identification perspective, UWB radar, radar, passive radar and WSN with special sensors make a great achievement. In the paper, a novel method...
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