Real-time video streaming using ultra-wideband(UWB) technology is experimentally demonstrated along long-reach passive optical networks(LR-PONs) with different wired and wireless reaches. Experimental tests using exte...Real-time video streaming using ultra-wideband(UWB) technology is experimentally demonstrated along long-reach passive optical networks(LR-PONs) with different wired and wireless reaches. Experimental tests using external and direct modulation with UWB wireless radiation in the 10- and 60-GHz bands are performed. An ultra-bendable fiber is also considered for a last-mile distribution. The video quality at the output of the optical fiber infrastructure of the LR-PON is assessed using the error vector magnitude(EVM), and the link quality indicator(LQI) is used as a figure of merit after wireless radiation. An EVM below –17 dB is achieved for both externally and directly modulated LR-PONs comprising up to 125 km of optical fiber. EVM improvement is observed for longer LR-PONs when directly modulated lasers(DMLs) are used because of the amplitude gain provided by the combined effect of dispersion and DML's chirp. Compared with optical back-to-back operation, the LQI level degrades to the maximum around 20% for LR-PONs ranging between 75 and 125 km of fiber reach and with a wireless coverage of 2 m in the 10-GHz UWB band. The same level of LQI degradation is observed using the 60-GHz UWB band with a LR-PON integrating 101 km of access network, a last-mile distribution using ultra-bendable fiber, and a 5.2-m wireless link.展开更多
The millimeter-wave frequency band(30~300 GHz)has received significant attention.Millimeter-wave frequencies have been used for backhaul,cell communication,and other high speed communication.With the advent of 5G comm...The millimeter-wave frequency band(30~300 GHz)has received significant attention.Millimeter-wave frequencies have been used for backhaul,cell communication,and other high speed communication.With the advent of 5G communication,millimeter-wave frequencies such as 60-GHz band have been attracting attention as possible candidate for next-generation wireless networks.The traditional application for 60-GHz band is point-to-point communication.Some typical scenarios have been cited in a recent 5G white paper.There exist some traditional channel models for 3G and 4G communication.However,5G has a new channel model(the outdoor-to indoor channel model,or O2I)that has not been clearly studied.Some conventional channel measurements have been conducted for this new band.Two measurement systems in the 60-GHz band for penetration loss and small-scale measurement for different scenarios are presented.By analyzing our measurement data,we can prove that the O2I channel does not generate new paths and only add some material penetration loss.展开更多
基金supported by the Fundao para a Ciência e a Tecnologia from Portugal under projects PEst-OE/EEI/LA0008/2013 and TURBO-PTDC/EEATEL/104358/2008by the European FIVER-FP7-ICT-2009-4-249142 project
文摘Real-time video streaming using ultra-wideband(UWB) technology is experimentally demonstrated along long-reach passive optical networks(LR-PONs) with different wired and wireless reaches. Experimental tests using external and direct modulation with UWB wireless radiation in the 10- and 60-GHz bands are performed. An ultra-bendable fiber is also considered for a last-mile distribution. The video quality at the output of the optical fiber infrastructure of the LR-PON is assessed using the error vector magnitude(EVM), and the link quality indicator(LQI) is used as a figure of merit after wireless radiation. An EVM below –17 dB is achieved for both externally and directly modulated LR-PONs comprising up to 125 km of optical fiber. EVM improvement is observed for longer LR-PONs when directly modulated lasers(DMLs) are used because of the amplitude gain provided by the combined effect of dispersion and DML's chirp. Compared with optical back-to-back operation, the LQI level degrades to the maximum around 20% for LR-PONs ranging between 75 and 125 km of fiber reach and with a wireless coverage of 2 m in the 10-GHz UWB band. The same level of LQI degradation is observed using the 60-GHz UWB band with a LR-PON integrating 101 km of access network, a last-mile distribution using ultra-bendable fiber, and a 5.2-m wireless link.
文摘针对5G热点高容量场景下的60 GHz脉冲无线通信系统中信号幅度衰落引起的误码问题,研究了该系统中Raptor码的误码性能。根据60 GHz短距离通信系统特点,采用IEEE 802.15.3c工作组建立的60 GHz无线信道模型,在此基础上分析了编码系统接收信噪比;然后结合信道编码理论,对不同编码方案进行误码性能仿真,重点对两种不同的Raptor码的编码增益、译码开销及通信距离进行对比。研究结果表明,采用1/2码率的QCLDPC预编码的Raptor码在接收信噪比大约为5 d B时,相较于未编码系统拥有4.5 d B的编码增益,同时最大通信距离为70 m,为未来5G高频新空口热点高容量场景下的60GHz短距离通信系统信道编码提供技术参考。
文摘The millimeter-wave frequency band(30~300 GHz)has received significant attention.Millimeter-wave frequencies have been used for backhaul,cell communication,and other high speed communication.With the advent of 5G communication,millimeter-wave frequencies such as 60-GHz band have been attracting attention as possible candidate for next-generation wireless networks.The traditional application for 60-GHz band is point-to-point communication.Some typical scenarios have been cited in a recent 5G white paper.There exist some traditional channel models for 3G and 4G communication.However,5G has a new channel model(the outdoor-to indoor channel model,or O2I)that has not been clearly studied.Some conventional channel measurements have been conducted for this new band.Two measurement systems in the 60-GHz band for penetration loss and small-scale measurement for different scenarios are presented.By analyzing our measurement data,we can prove that the O2I channel does not generate new paths and only add some material penetration loss.
