On the Variable Capacity Property of CC/DS-CDMA Systems

IEEE Transactions on Vehicular Technology ◽

10.1109/tvt.2006.873817 ◽

2006 ◽

Vol 55 (3) ◽

pp. 774-778 ◽

Cited By ~ 3

Author(s):

L.-P. Wang ◽

Y. Yang ◽

H.-H. Chen ◽

Y.-H. Song

Keyword(s):

Variable Capacity ◽

Cdma Systems

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ESTIMATION OF TECHNICAL, SPECIALIZED AND ECONOMIC EFFICIENCY OF CULTIVATED POTATO VARIETIES USING DATA ENVELOPE ANALYSIS METHOD (DEA) IN IRAQ FOR SPRING LUG 2018

Anbar Journal of Agricultural Sciences ◽

10.32649/ajas/2020/11 ◽

2020 ◽

pp. 119-131

Keyword(s):

Technical Efficiency ◽

Economic Efficiency ◽

Potato Crop ◽

Economic Status ◽

Analysis Method ◽

Envelope Analysis ◽

Variable Capacity ◽

Data Envelope Analysis ◽

Using Data ◽

The Stability

Research highlights the importance of potato crop, which occupies a prominent food and economic status in food security besides rice, wheat and corn at the local and global level. Despite the expansion of the cultivation of potato crop in Iraq in general and Ameriyah district in particular However, potato productivity remains substandard, this may be due to a lack of knowledge of the most efficient varieties and not to use productive resources at the levels at which technical, specialized and economic efficiency is achieved. Therefore, the aim of the research is to determine the technical, specialized and economic efficiency according to the cultivated seed category. The data envelope analysis (DEA) method was used to estimate technical, specialized and economic efficiency, assuming constant and variable capacity returns. As a result of the study, the Safrana variety achieved the highest average technical efficiency according to the stability of the yield and capacity efficiency in addition to achieving the highest average specialized and economic efficiency, The Lapadia variety achieved the highest average technical efficiency, assuming that capacity returns have changed. Therefore, we recommend the adoption of items that achieve higher efficiency and the need to redistribute the elements of production better and Achieving the optimum levels at which technical, specialized and economic efficiency is achieved and saving what has been wasted.

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Study of Power Control in CDMA System on the basis of optimization Technique

International Journal of Advanced Research in Computer Science and Software Engineering ◽

10.23956/ijarcsse.v7i8.38 ◽

2017 ◽

Vol 7 (8) ◽

pp. 126

Author(s):

. Geetanjli

Keyword(s):

Power Control ◽

Multiple Access ◽

Optimization Technique ◽

System Optimization ◽

Base Station ◽

Particle Swarm Algorithm ◽

Cdma System ◽

Frequency Division ◽

Cdma Systems ◽

Time Division

The power control in CDMA systems, grant numerous users to share resources of the system uniformly between each other, leading to expand capacity. With convenient power control, capacity of CDMA system is immense in contrast of frequency division multiple access (FDMA) and time division multiple access (TDMA). If power control is not achieved numerous problems such as the near-far effect will start to monopolize and consequently will reduce the capacity of the CDMA system. However, when the power control in CDMA systems is implemented, it allows numerous users to share resources of the system uniformly between themselves, leading to increased capacity For power control in CDMA system optimization algorithms i.e. genetic algorithm & particle swarm algorithm can be used which regulate a convenient power vector. These power vector or power levels are dogged at the base station and announce to mobile units to alter their transmitting power in accordance to these levels. The performances of the algorithms are inspected through both analysis and computer simulations, and compared with well-known algorithms from the literature.

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