We demonstrate the transmission of 2.5-Gb/s WDM signals spaced at 5 GHz over 480 km of single-mode fiber. The results indicate that it should be possible to transmit more than one thousand 2.5-Gb/s channels spaced at ...We demonstrate the transmission of 2.5-Gb/s WDM signals spaced at 5 GHz over 480 km of single-mode fiber. The results indicate that it should be possible to transmit more than one thousand 2.5-Gb/s channels spaced at 5 GHz over long distance.展开更多
A 5GHz low power direct conversion receiver radio frequency front-end with balun LNA is presented. A hybrid common gate and common source structure balun LNA is adopted, and the capacitive cross-coupling technique is ...A 5GHz low power direct conversion receiver radio frequency front-end with balun LNA is presented. A hybrid common gate and common source structure balun LNA is adopted, and the capacitive cross-coupling technique is used to reduce the noise contribution of the common source transistor. To obtain low 1/f noise and high linearity, a current mode passive mixer is preferred and realized. A current mode switching scheme can switch between high and low gain modes, and meanwhile it can not only perform good linearity but save power consump- tion at low gain mode. The front-end chip is manufactured on a 0.13-#m CMOS process and occupies an active chip area of 1.2 mm2. It achieves 35 dB conversion gain across 4.9-5.1 GHz, a noise figure of 7.2 dB and an IIP3 of -16.8 dBm, while consuming 28.4 mA from a 1.2 V power supply at high gain mode. Its conversion gain is 13 dB with an IIP3 of 5.2 dBm and consumes 21.5 mA at low gain mode.展开更多
针对良性阵发性位置性眩晕(BPPV)诊断中视频眼震记录仪存在的分辨率低、帧率低、抗干扰能力不足的问题,提出了一种实时的无线高速视频眼震追踪系统。基于ARM Cortex-A7构架和最新5 G WiFi模块设计了高速无线传输的核心控制板,使用MIPI...针对良性阵发性位置性眩晕(BPPV)诊断中视频眼震记录仪存在的分辨率低、帧率低、抗干扰能力不足的问题,提出了一种实时的无线高速视频眼震追踪系统。基于ARM Cortex-A7构架和最新5 G WiFi模块设计了高速无线传输的核心控制板,使用MIPI相机接口保证了视频的高速采集,采用H. 265高性能编码技术实现视频的无损压缩,通过RTSP实时网络传输协议完成无线传输网络构建,终端通过无线网络接收眼震视频,进行基于暗瞳的实时眼震追踪算法分析获取眼震信息。在视频分辨率、帧率对系统精度的影响与不同传输方式的抗干扰能力,实验结果表明:提出的高速视频眼震分析系统精度高、抗干扰能力强,能准确获取眼震轨迹,为疾病的诊断奠定了基础。展开更多
文摘We demonstrate the transmission of 2.5-Gb/s WDM signals spaced at 5 GHz over 480 km of single-mode fiber. The results indicate that it should be possible to transmit more than one thousand 2.5-Gb/s channels spaced at 5 GHz over long distance.
基金Project supported by the National High Technology Research and Development Program of China(No.2009AA011605)
文摘A 5GHz low power direct conversion receiver radio frequency front-end with balun LNA is presented. A hybrid common gate and common source structure balun LNA is adopted, and the capacitive cross-coupling technique is used to reduce the noise contribution of the common source transistor. To obtain low 1/f noise and high linearity, a current mode passive mixer is preferred and realized. A current mode switching scheme can switch between high and low gain modes, and meanwhile it can not only perform good linearity but save power consump- tion at low gain mode. The front-end chip is manufactured on a 0.13-#m CMOS process and occupies an active chip area of 1.2 mm2. It achieves 35 dB conversion gain across 4.9-5.1 GHz, a noise figure of 7.2 dB and an IIP3 of -16.8 dBm, while consuming 28.4 mA from a 1.2 V power supply at high gain mode. Its conversion gain is 13 dB with an IIP3 of 5.2 dBm and consumes 21.5 mA at low gain mode.
文摘针对良性阵发性位置性眩晕(BPPV)诊断中视频眼震记录仪存在的分辨率低、帧率低、抗干扰能力不足的问题,提出了一种实时的无线高速视频眼震追踪系统。基于ARM Cortex-A7构架和最新5 G WiFi模块设计了高速无线传输的核心控制板,使用MIPI相机接口保证了视频的高速采集,采用H. 265高性能编码技术实现视频的无损压缩,通过RTSP实时网络传输协议完成无线传输网络构建,终端通过无线网络接收眼震视频,进行基于暗瞳的实时眼震追踪算法分析获取眼震信息。在视频分辨率、帧率对系统精度的影响与不同传输方式的抗干扰能力,实验结果表明:提出的高速视频眼震分析系统精度高、抗干扰能力强,能准确获取眼震轨迹,为疾病的诊断奠定了基础。
