China
Africa
Explore chapters and articles related to this topic
Noise and Interference
Published in Michel Daoud Yacoub, Foundations of Mobile Radio Engineering, 2019
A comparison between the levels of different types of noise is shown in Figure 7.3, where the received noise power Fα is given in decibels above the thermal noise kTB (T = 290 K). Note that receiver noise has a more significant value than the atmospheric noise for frequencies above 30 MHz. In addition, the receiver noise has a more significant value than the galactic noise for frequencies above 250 MHz. On the other hand, galactic noise has a higher value than atmospheric noise for frequencies above 20 MHz. However, man-made noise usually predominates over all other sorts of noise, being negligible (relative to receiver front-end noise) for frequencies above 4 GHz.
Channel Impairments
Published in Mário Marques da Silva, Cable and Wireless Networks, 2018
The noise factor is defined as the ratio between the received noise power and the noise power delivered by a charge with the reference noise temperature of 300 K (To). Expressing this value in logarithmic units leads us to the noise figure,† defined by Fa=10log10fa
*
Published in Jerry D. Gibson, Mobile Communications Handbook, 2017
where k is Boltzmann's constant (1.38 × 10−23 J/K), T° is effective temperature in kelvin, and W is bandwidth in hertz. Dividing Equation 18.3 by bandwidth enables us to write the received noise-power spectral density N0 as follows: N0=NW=kT°
Analysis on TD-LTE wireless private network capacity meeting the interaction demand of future smart grid
Published in Journal of International Council on Electrical Engineering, 2018
Wei-Wei Miao, Lei Wei, Xiang-Dong Chen, Cheng-Ling Jiang, Yi Zhang, Wei Li, Rui Liu, Jun Zou
Assuming the transmit power is p dBm, the bandwidth of the transmit signal is π dB-Hz, the noise figure at the receiver is , the received noise power can be expressed as