scholarly journals Frequency-Domain Oversampling for Cognitive CDMA Systems: Enabling Robust and Massive Multiple Access for Internet of Things

IEEE Access ◽  
2016 ◽  
Vol 4 ◽  
pp. 4583-4589 ◽  
Author(s):  
Su Hu ◽  
Huiting Guo ◽  
Chuanxue Jin ◽  
Yixuan Huang ◽  
Bin Yu ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Frequency Domain ◽  
Multiple Access ◽  
Cdma Systems

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

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.

EM-Based Adaptive Frequency Domain Estimation of Doppler Shifts with CRLB Analysis for CDMA Systems

2012 ◽  
Vol 60 (1) ◽  
pp. 198-208 ◽  
Author(s):  
Tianqi Wang ◽  
Cheng Li ◽  
Weixiao Meng ◽  
Hsiao-Hwa Chen ◽  
Mohsen Guizani
Keyword(s):  
Frequency Domain ◽  
Doppler Shifts ◽  
Cdma Systems
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