A New Method for Frequency-Division Multiplexing, and Its Integration with Time-Division Switching

1965 ◽  
Vol 9 (2) ◽  
pp. 137-140 ◽  
Author(s):  
P. M. Thrasher
Keyword(s):  
New Method ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Time Division Switching ◽  
Time Division

scholarly journals Rendimiento de la técnica de acceso múltiple no ortogonal (NOMA) en un sistema de comunicación móvil Long-Term Evolution (LTE)

2020 ◽  
Vol 3 (1) ◽  
pp. 62-76
Keyword(s):  
Long Term Evolution ◽  
Frequency Division Multiplexing ◽  
Third Generation ◽  
Frequency Division ◽  
Time Division Multiplexing ◽  
Term Evolution ◽  
Time Division ◽  
Third Generation Partnership Project

La creciente demanda de datos a través de las redes móviles y la búsqueda de servicios más eficientes por parte de los usuarios han inducido a la generación de nuevas técnicas que incrementen la eficiencia espectral. El acceso múltiple no-ortogonal (NOMA) es una de las técnicas que están siendo evaluadas dentro del 3GPP (Third Generation Partnership Project), esta proporciona servicios a múltiples usuarios mediante multiplexación en potencia. Esta investigación evalúa el rendimiento de NOMA en sistemas LTE (Long Term Evolution) mediante simulaciones de capa física, en relación con las tecnologías de acceso múltiple ortogonales convencionales TDM (Time Division Multiplexing) y FDM (Frequency Division Multiplexing). Se compararán, además, las ganancias obtenidas, con las publicadas en la bibliografía de Advanced Television Systems Committee(ATSC) 3.0. Los resultados demuestran que NOMA es mejor que TDM en los casos que se utilice una tasa baja en el receptor móvil y una tasa media en el receptor fijo, demostrando ganancias de 3.35 y 0.25 respectivamente.

Radar Orthogonal Frequency Division Multiplexing Waveforms Agility Processing with Compressive Sensing

2013 ◽  
Vol 416-417 ◽  
pp. 1181-1186
Author(s):  
Feng Xie ◽  
Feng Liu ◽  
Xiao Hui Ye
Keyword(s):  
Compressive Sensing ◽  
Orthogonal Frequency Division Multiplexing ◽  
Matched Filter ◽  
New Method ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Measurement Matrix ◽  
Range Profile ◽  
Ofdm Signals

CS is a very new method that is being evaluated for many applications, in which signals are sparse in some basis/dictionary, e.g. the radar range profile. In this article, we have formulated the range processing with CS and introduced fair comparisons between matched filter and CS with chirps and OFDM signals. Two relevant features have been inspected: waveform bandwidth and measurement matrix.

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.

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