The directional neighbor discovery problem,i.e,spatial rendezvous,is a fundamental problem in millimeter wave(mmWave)wireless networks,where directional transmissions are used to overcome the high attenuation.The chal...The directional neighbor discovery problem,i.e,spatial rendezvous,is a fundamental problem in millimeter wave(mmWave)wireless networks,where directional transmissions are used to overcome the high attenuation.The challenge is how to let the transmitter and the receiver beams meet in space under deafness caused by directional transmission and reception,where no control channel,prior information,and coordination are available.In this paper,we present a Hunting based Directional Neighbor Discovery(HDND)scheme for ad hoc mmWave networks,where a node follows a unique sequence to determine its transmission or reception mode,and continuously r0-tates its directional beam to scan the neighborhood for other mmWave nodes.Through a rigorous analysis,we derive the conditions for ensured neighbor discovery,as well as a bound for the worst-case discovery time and the impact of sidelobes.We validate the analysis with extensive simulations and demonstrate the superior perfor-mance of the proposed scheme over several baseline schemes.展开更多
A power amplifier’s linearity determines the emission signal’s quality and the efficiency of the system.Nonlinear distortion can result in system bit error,out-of-band radiation,and interference with other channels,...A power amplifier’s linearity determines the emission signal’s quality and the efficiency of the system.Nonlinear distortion can result in system bit error,out-of-band radiation,and interference with other channels,which severely influence communication system’s quality and reliability.Starting from the third-order intermodulation point of the milimeter wave(mm-Wave)power amplifiers,the circuit’s nonlinearity is compensated for.The analysis,design,and implementation of linear class AB mm-Wave power amplifiers based on GlobalFoundries 45 nm CMOS silicon-on-insulator(SOI)technology are presented.Three single-ended and differential stacked power amplifiers have been implemented based on cascode cells and triple cascode cells operating in U-band frequencies.According to nonlinear analysis and on-wafer measurements,designs based on triple cascode cells outperform those based on cascode cells.Using single-ended measurements,the differential power amplifier achieves a measured peak power-added efficiency(PAE)of 47.2%and a saturated output power(P_(sat))of 25.2 dBm at 44 GHz.The amplifier achieves a P_(sat)higher than 23 dBm and a maximum PAE higher than 25%in the measured bandwidth from 44 GHz to 50 GHz.展开更多
基金This work was supported in part by the NSF under Grants ECCS-1923717 and CNS-1320472the Wireless Engineering Research and Education Center,Auburn University,Auburn,AL,USA.
文摘The directional neighbor discovery problem,i.e,spatial rendezvous,is a fundamental problem in millimeter wave(mmWave)wireless networks,where directional transmissions are used to overcome the high attenuation.The challenge is how to let the transmitter and the receiver beams meet in space under deafness caused by directional transmission and reception,where no control channel,prior information,and coordination are available.In this paper,we present a Hunting based Directional Neighbor Discovery(HDND)scheme for ad hoc mmWave networks,where a node follows a unique sequence to determine its transmission or reception mode,and continuously r0-tates its directional beam to scan the neighborhood for other mmWave nodes.Through a rigorous analysis,we derive the conditions for ensured neighbor discovery,as well as a bound for the worst-case discovery time and the impact of sidelobes.We validate the analysis with extensive simulations and demonstrate the superior perfor-mance of the proposed scheme over several baseline schemes.
基金Project supported by the National Natural Science Foundation of China(No.62001232)。
文摘A power amplifier’s linearity determines the emission signal’s quality and the efficiency of the system.Nonlinear distortion can result in system bit error,out-of-band radiation,and interference with other channels,which severely influence communication system’s quality and reliability.Starting from the third-order intermodulation point of the milimeter wave(mm-Wave)power amplifiers,the circuit’s nonlinearity is compensated for.The analysis,design,and implementation of linear class AB mm-Wave power amplifiers based on GlobalFoundries 45 nm CMOS silicon-on-insulator(SOI)technology are presented.Three single-ended and differential stacked power amplifiers have been implemented based on cascode cells and triple cascode cells operating in U-band frequencies.According to nonlinear analysis and on-wafer measurements,designs based on triple cascode cells outperform those based on cascode cells.Using single-ended measurements,the differential power amplifier achieves a measured peak power-added efficiency(PAE)of 47.2%and a saturated output power(P_(sat))of 25.2 dBm at 44 GHz.The amplifier achieves a P_(sat)higher than 23 dBm and a maximum PAE higher than 25%in the measured bandwidth from 44 GHz to 50 GHz.
