Results 21 to 30 of about 537,997 (309)

Linear Constellation Precoded OFDM With Interleaved Subcarrier Index Modulation

open access: yesIEEE Access, 2019
Orthogonal frequency-division multiplexing with index modulation (OFDM-IM) is an emerging and promising multicarrier transmission technique; however, frequency diversity achievement requires further investigation for the OFDM-IM.
Qingbo Wang   +3 more
doaj   +1 more source

The effects of spatial diversity on the synchronization of MIMO-OFDM systems [PDF]

open access: yes, 2012
This chapter studies the influence of spatial diversity on the synchronization of MIMO-OFDM systems. Upon revising the main features of OFDM and diversity techniques, this chapter focuses on the following topics.
Wu, YC, Qaraqe, K, Zhou, Y, Serpedin, E
core   +1 more source

Prospects of FMCW-based frequency diverse array radar

open access: yesThe Journal of Engineering, 2019
The linear frequency modulated (LFM) frequency modulated continuous wave (FMCW)-based frequency diverse array (FDA) radar concept is investigated in detail. The radar operates as a linear pulsed FMCW/FDA in the transmission (TX) mode while it operates as
Ramazan Çetiner   +3 more
doaj   +1 more source

Vegetation composition on peatlands with different fire frequency in Musi Banyuasin, South Sumatra

open access: yesJournal of Natural Resources and Environmental Management, 2022
Peatlands that experience fire have the ability to restore their own environment through a process of vegetation succession. Areas with different frequency of fires have different vegetation dominance.
Awaludin Jamil   +2 more
doaj   +1 more source

Optimal training sequences for channel estimation in cyclic-prefix-based single-carrier systems with transmit diversity [PDF]

open access: yes, 2004
In this paper, we investigate a new class of training sequences that are optimal for least squares (LS) channel estimation in systems employing transmit diversity and single-carrier (SC) modulation with a cyclic prefix (CP) extension.
Coon, J, McGeehan, JP, Beach, MA
core   +1 more source

Presence of a loner strain maintains cooperation and diversity in well-mixed bacterial communities [PDF]

open access: yes, 2016
Cooperation and diversity abound in nature despite cooperators risking exploitation from defectors and superior competitors displacing weaker ones. Understanding the persistence of cooperation and diversity is therefore a major problem for evolutionary ...
Inglis, R. Fredrik   +6 more
core   +1 more source

Exploiting Fine-Grained Subcarrier Information for Device-Free Localization in Wireless Sensor Networks

open access: yesSensors, 2018
Device-free localization (DFL) that aims to localize targets without carrying any electronic devices is addressed as an emerging and promising research topic.
Yan Guo, Dongping Yu, Ning Li
doaj   +1 more source

Cooperative diversity in carrier frequency offset [PDF]

open access: yesIEEE Communications Letters, 2007
Cooperative diversity can enjoy the same benefits of MIMO systems when there is no possibility of carrying multiple antennas on a communication terminal. The main distinction between MIMO and cooperative diversity systems is the inherent asynchronism in the latter.
openaire   +1 more source

Plasmodium falciparum msp1, msp2 and glurp allele frequency and diversity in sub-Saharan Africa. [PDF]

open access: yes, 2011
The efficacy of anti-malarial drugs is assessed over a period of 28-63 days (depending on the drugs' residence time) following initiation of treatment in order to capture late failures.
Sumari Deborah   +35 more
core   +1 more source

A Novel Device-Free Counting Method Based on Channel Status Information

open access: yesSensors, 2018
Crowd counting is of significant importance for numerous applications, e.g., urban security, intelligent surveillance and crowd management. Existing crowd counting methods typically require specialized hardware deployment and strict operating conditions,
Junhuai Li   +4 more
doaj   +1 more source

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