Signal Design to Optimize Trade-Off between Bandwidth Efficiency and Power Efficiency in Uplink CDMA Systems

2006 ◽  
Vol E89-A (11) ◽  
pp. 3032-3041 ◽  
Author(s):  
A. HANDA ◽  
M. FUJII ◽  
M. ITAMI ◽  
K. ITOH
Keyword(s):  
Power Efficiency ◽  
Bandwidth Efficiency ◽  
Signal Design ◽  
Trade Off ◽  
Cdma Systems

Universal Optimization Efficiency for Nonlinear Irreversible Heat Engines

2017 ◽  
Vol 42 (3) ◽  
Author(s):  
Yanchao Zhang ◽  
Juncheng Guo ◽  
Guoxing Lin ◽  
Jincan Chen
Keyword(s):  
Objective Function ◽  
Strong Coupling ◽  
Power Efficiency ◽  
Symmetry Condition ◽  
Maximum Efficiency ◽  
Cycle Model ◽  
Trade Off ◽  
Heat Engines ◽  
Optimization Efficiency ◽  
Universal Expression

AbstractWe introduce a multi-parameter combined objective function of heat engines under the strong coupling and symmetry condition and derive the universal expression of the optimization efficiency. The results obtained show that the optimization efficiency derived from the multi-parameter combined objective function include a variety of optimization efficiencies, such as the efficiency at the maximum power, efficiency at the maximum efficiency-power state, efficiency at the maximum ecological or unified trade-off function, and Carnot efficiency. It is further explained that these results are also suitable for the endoreversible cycle model of the Carnot heat engines operating between two heat reservoirs.

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