Results 11 to 20 of about 57,490 (299)
Experimental study of depolarization and antenna correlation in tunnels in the 1.3 GHz band [PDF]
, 2019 Measurements have been carried out in a low-traffic road tunnel to investigate the influence of the polarization of the transmitting and receiving antennas on the channel characteristics. A real-time channel sounder working in a frequency band around 1.3
Challita, Frederic +5 more
core +3 more sources
A survey of mechanical antennas applied for low-frequency transmitting
iScience, 2023 Summary: The mechanical antenna (MA) is a new type of low-frequency (LF) transmitting antenna that generates an alternating electromagnetic (EM) signal through the mechanical movement of electric charges or magnetic dipoles, which is an interdisciplinary
Yong Cui +6 more
doaj +1 more source
The Approximate Capacity of the MIMO Relay Channel [PDF]
, 2014 Capacity bounds are studied for the multiple-antenna complex Gaussian relay channel with t1 transmitting antennas at the sender, r2 receiving and t2 transmitting antennas at the relay, and r3 receiving antennas at the receiver.
Jin, Xianglan, Kim, Young-Han
core +1 more source
Solar-Terrestrial Physics, 2019 When developing the first topside ionosphere sounding stations, the issue was debated concerning the improvement of the electromagnetic compatibility of such devices through the use of chirp signals.
Podlesnyi A.V. +2 more
doaj +1 more source
Intelligent Surface-Aided Transmitter Architectures for Millimeter-Wave Ultra Massive MIMO Systems
IEEE Open Journal of the Communications Society, 2021 In this article, we study two novel massive multiple-input multiple-output (MIMO) transmitter architectures for millimeter wave (mmWave) communications which comprise few active antennas, each equipped with a dedicated radio frequency (RF) chain, that ...
Vahid Jamali +4 more
doaj +1 more source
Secure Communications in Millimeter Wave Ad Hoc Networks [PDF]
, 2017 Wireless networks with directional antennas, like millimeter wave (mmWave) networks, have enhanced security. For a large-scale mmWave ad hoc network in which eavesdroppers are randomly located, however, eavesdroppers can still intercept the confidential ...
Heath Jr, Robert W. +3 more
core +2 more sources
Asymptotics of transmit antenna selection: Impact of multiple receive antennas [PDF]
2017 IEEE International Conference on Communications (ICC), 2017 Consider a fading Gaussian MIMO channel with $N_\mathrm{t}$ transmit and $N_\mathrm{r}$ receive antennas. The transmitter selects $L_\mathrm{t}$ antennas corresponding to the strongest channels. For this setup, we study the distribution of the input-output mutual information when $N_\mathrm{t}$ grows large.
Asaad, Saba +3 more
openaire +2 more sources
Phased-MIMO Radar: A Tradeoff Between Phased-Array and MIMO Radars [PDF]
, 2009 We propose a new technique for multiple-input multiple-output (MIMO) radar with colocated antennas which we call phased-MIMO radar. The new technique enjoys the advantages of MIMO radar without sacrificing the main advantage of phased-array radar which ...
Aboulnasr Hassanien +2 more
core +2 more sources
Delivering live-action to handheld devices: experimental results and recommendations [PDF]
, 2009 This paper addresses the broadcast capabilities of WiFi systems transmitting to handheld devices. The analysis includes a comparison of different antennas at the access point (AP) in terms of received signal strength indication (RSSI) for different ...
Bull, DR +3 more
core +2 more sources
Serial Patch Array Antenna for an FMCW Radar Housed in a White Cane
International Journal of Antennas and Propagation, 2016 The design, realization, and test of the transmitting and receiving antennas for an FMCW radar operating between 24 and 24.25 GHz (ISM band), to be housed in a white cane for improving mobility of visually impaired subjects, have been performed.
Stefano Pisa +2 more
doaj +1 more source