单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,2019/12/14,#,Full-Duplex,Wireless communication,王亚飞,1130349096,陈,思维,1130349076,上海交大无线通信技术研究所,Faster,Introduction,It is generally not possible for radios to receive and transmit on the same frequency band because of the interference that results.Thus,bidirectional systems must separate the uplink and downlink channels into orthogonal signaling dimensions,typically using time or frequency dimensions.,-,Andrea Goldsmith,Wireless Communications,Cambridge Press,2005.,Can wireless nodes transmit and receive at the same time and on the same channel?,Can you hear me,boy?,No,lets speak in turns.,TD,Hi,boy!,Hi,girl!,FD,Frequency resources,Computer network,Wireless network,On the same frequency band In the same time slot,The Challenge in Achieving Full-Duplex,The main challenge in achieving full-duplex is canceling the strong interference at the receive interface from the transmit interface of a node.Digital cancellation techniques fail in trying to cancel this self-interference as the strength of the interference saturates the analog-to-digital converters.,How to do?,We,send two signals such that they cancel each other at the receiving antenna-the device,ears.,The,canceling effect is purely local,so the other node can still hear what were sending,.,RF model of a full-duplex system,Why Is This Important?,Revolutionize,the wireless,world,Double,the spectral efficiency of every radio,in,the world,An,economic value of trillions of,Simplifiy,spectrum,management,Future work,The bigger change will be developing new wireless standards for full-duplex.I expect people may start seeing this when carriers upgrade to 4.5G or 5G networks in just a few years,.“-,Ashu Sabharwal,Full Duplex Wireless,cellular,Full Duplex Wireless doubles wireless capacity and reduces spectrum requirements for wireless,solutions,Global Spectrum Harmonization,Facilitating,global LTE roaming by enablingcellular infrastructure and mobile phones to supportmultiple frequencies and carrier aggregation,High Capacity Dense WiFi,Full Duplex Wireless increases,WiFi throughput and resiliency in dense and crowded environments without any change to existing,clients,Thank you!,