scholarly journals Entropy and Channel Capacity under Optimum Power and Rate Adaptation over Generalized Fading Conditions

2015 ◽  
Vol 22 (11) ◽  
pp. 2162-2166 ◽  
Author(s):  
Paschalis C. Sofotasios ◽  
Sami Muhaidat ◽  
Mikko Valkama ◽  
Mounir Ghogho ◽  
George K. Karagiannidis
Keyword(s):  
Channel Capacity ◽  
Rate Adaptation ◽  
Power And Rate Adaptation

Capacity Improvement of a Free Space Optical Satellite Uplink using Transmitter Power and Rate Adaptation

2017 ◽  
Vol 38 (4) ◽  
Author(s):  
Pooja Gopal ◽  
V. K. Jain ◽  
Subrat Kar
Keyword(s):  
Free Space ◽  
Estimation Method ◽  
Rate Adaptation ◽  
Free Space Optical ◽  
Link Length ◽  
Channel State ◽  
Channel Changes ◽  
Transmitter Power ◽  
Geo Satellite ◽  
Power And Rate Adaptation

AbstractDegradation due to atmospheric turbulence leads to significant outage in a free space optical satellite uplink with fixed transmitter parameters. If the channel state is known at the transmitter, then its parameters can be suitably changed, and there could be a considerable improvement in channel capacity. However, the extremely long link length of an Earth-to-Geostationary Earth Orbit (GEO) satellite link would render feedback of channel state from the receiver infeasible, before the channel changes. In this paper, a channel pre-estimation method at the transmitter is proposed, and the expression for capacity with transmitter power and rate adaptation is derived. The results are compared with that of the capacity with outage. It is observed that there can be an improvement by a factor of 1.66 in achievable average capacity per Hertz with the adaptive transmitter. Also, the outage probability is reduced from 18.02 % to almost 0.

scholarly journals Joint Power and Rate Adaptation in Ad Hoc Networks Based on Coupled Interference

2011 ◽  
Vol 5 ◽  
pp. 272-279 ◽  
Author(s):  
Fredrick Mzee Awuor ◽  
Karim Djouani ◽  
Guillaume Noel
Keyword(s):  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Rate Adaptation ◽  
Joint Power ◽  
Hoc Networks ◽  
Power And Rate Adaptation
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