Achieving directionality and transmit diversity via smart antenna pattern oscillation with a geometric-based stochastic channel model for coherence time evaluation

2002 ◽  
Author(s):  
S.A. Zekavat ◽  
C.R. Nassar ◽  
S. Shattil
Keyword(s):  
Channel Model ◽  
Smart Antenna ◽  
Transmit Diversity ◽  
Coherence Time ◽  
Antenna Pattern ◽  
Time Evaluation

Smart antenna spatial sweeping for combined directionality and transmit diversity

2000 ◽  
Vol 2 (4) ◽  
pp. 325-330 ◽  
Author(s):  
Seyed Alireza Zekavat ◽  
Carl R. Nassar ◽  
Steve Shattil
Keyword(s):  
Smart Antenna ◽  
Transmit Diversity

scholarly journals Coherence Time Evaluation in Indoor Optical Wireless Communication Channels

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5067
Author(s):  
Dima Bykhovsky
Keyword(s):  
Wireless Communication ◽  
Communication Channels ◽  
Coherence Time ◽  
Time Constraints ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Channel Changes ◽  
Time Period ◽  
Time Evaluation ◽  
Indoor Optical Wireless Communication

The coherence time is the time over which the channel-gain-values correlation coefficient drops below a predefined threshold. The coherence time is typically used to quantify the pace of appreciable channel changes and is important, for example, for determining handoff and resource allocation time constraints. The goal of this work is to experimentally measure the coherence time of indoor optical wireless communication (OWC) channels under various mobile scenarios. The amount of movement was quantified by mobile sensor measurements. The experiments show that it is reasonable to assume that the channel varies slowly for a time period of ~100 milliseconds for most mobile scenarios.

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