Results 71 to 80 of about 34,935 (182)

Joint Delay Doppler Probability Density Functions for Air-to-Air Channels

International Journal of Antennas and Propagation, 2014
Recent channel measurements indicate that the wide sense stationary uncorrelated scattering assumption is not valid for air-to-air channels. Therefore, purely stochastic channel models cannot be used. In order to cope with the nonstationarity a geometric
Michael Walter, Dmitriy Shutin, Uwe-Carsten Fiebig   +2 more
doaj   +1 more source

Joint 2-D DOA and Doppler Estimation for L-Shaped Array via Dual PARAFAC With Triple Matching Implementation

IEEE Access, 2019
A dual parallel factor (PARAFAC)-based approach to jointly estimating the two-dimensional direction of arrival (2-D DOA) and Doppler is proposed in this paper, where an L-shaped array consisting of acoustic vector-sensor is used.
Riheng Wu, Le Xu, Zhenhai Zhang, Yangyang Dong   +3 more
doaj   +1 more source

Vehicle-to-Vehicle Radio Channel Characteristics for Congestion Scenario in Dense Urban Region at 5.9 GHz

International Journal of Antennas and Propagation, 2018
This paper reports the results of a car-following measurement of the wireless propagation channel at 5.9 GHz on a seriously congested urban road in Wuhan, China.
Yishui Shui, Fang Li, Junyi Yu, Wei Chen, Changzhen Li, Kun Yang, Fuxing Chang   +6 more
doaj   +1 more source

On the Effects of Ocean Surface Motion on Delay-Doppler Altimetry [PDF]

IEEE Transactions on Geoscience and Remote Sensing
The Poseidon-4 radar altimeter on board Sentinel-6 “Michael Freilich” (S6-MF) offers unique opportunities to assess the impact of ocean surface motion on Delay-Doppler altimetry. In this paper, earlier “frozen-sea” studies of the instrument response to an isolated sea surface facet are extended to include the effect of surface motions in its Delay ...
Marié, Louis, Nouguier, Frederic, Vandemark, Douglas C., Ardhuin, Fabrice, Chapron, Bertrand   +4 more
openaire   +3 more sources

Optimized Multiplicative Pre-Distortion PAPR Reduction Scheme for OTFS Signals

IEEE Access
We present an iterative peak-to-average power ratio (PAPR) reduction scheme with multiplicative pre-distortion vectors for orthogonal time frequency space (OTFS) systems by making a compromise between the PAPR reduction and the bit error rate (BER ...
Feiyang Liu, Jiayang Zhao, Guangliang Ren   +2 more
doaj   +1 more source

Exploiting Time And Frequency Information For Delay/Doppler Altimetry

, 2014
Publication in the conference proceedings of EUSIPCO, Lisbon, Portugal ...
Halimi, Abderrahim, Mailhes, Corinne, Tourneret, Jean-Yves, Moreau, Thomas, Boy, François   +4 more
openaire   +3 more sources

A New Micro-Subcarrier OFDM-Based Waveform for Delay Doppler Domain Communication

IEEE Access
This paper presents a new OFDM based modulation scheme for communication in doubly dispersive channels. We call this Delay-Doppler OFDM (DD-OFDM). Our waveform has the same sparse-channel benefits as orthogonal-time-frequency-space (OTFS) modulation ...
Swaroop Gopalam, Sibiraj B. Pillai, Philip Whiting, Hazer Inaltekin, Iain B. Collings, Stephen V. Hanly   +5 more
doaj   +1 more source

Radar studies of the moon Quarterly progress report no. 1 [PDF]

Lunar radar studies - unambiguous coherent radar mapping at 23 cm, high-resolution 3.8-cm reflectivity mapping, and progress in 8-mm radar ...

core   +1 more source

Communication performance over the TDRS multipath/interference channel [PDF]

Previously developed models are used to predict communication system performance for two cases: and aircraft/TDRS and a weather satellite/TDRS relay.
Gaushell, D., Jenny, J., Shaft, P.
core   +1 more source

Pilot-Based Iterative Path Estimation and Maximum Ratio Combining (MRC)–Based Signal Detection of Orthogonal Time–Frequency Space (OTFS) Modulation for 6G in Fractional Doppler Channels

Journal of Computer Networks and Communications
The sixth generation (6G) wireless networks are used to provide a large coverage, and also this generation needed to support different emerging applications in harsh areas with higher user equipment mobility.
Ephrem Gelamite Demere, Zelalem Hailu Gebeyehu   +1 more
doaj   +1 more source