Search results
Results From The WOW.Com Content Network
Link budget. A link budget is an accounting of all of the power gains and losses that a communication signal experiences in a telecommunication system; from a transmitter, through a communication medium such as radio waves, cable, waveguide, or optical fiber, to the receiver. It is an equation giving the received power from the transmitter ...
Omnidirectional antenna. In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis ( azimuthal directions), with power varying with angle to the axis ( elevation angle ), declining to zero on the axis. [ 1][ 2] When graphed in three dimensions (see graph ...
Directivity. In electromagnetics, directivity is a parameter of an antenna or optical system which measures the degree to which the radiation emitted is concentrated in a single direction. It is the ratio of the radiation intensity in a given direction from the antenna to the radiation intensity averaged over all directions. [ 1] Therefore, the ...
Operating margin. In business, operating margin —also known as operating income margin, operating profit margin, EBIT margin and return on sales ( ROS )—is the ratio of operating income ("operating profit" in the UK) to net sales, usually expressed in percent. Net profit measures the profitability of ventures after accounting for all costs.
Effective radiated power ( ERP ), synonymous with equivalent radiated power, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter. It is the total power in watts that would have to be radiated by a half-wave dipole antenna to give the same radiation intensity (signal strength ...
Friis' Free-space Radio Circuit. This leads to his published form of his transmission formula: where: P t {\displaystyle P_ {t}} is the power fed into the transmitting antenna input terminals; [ 2] P r {\displaystyle P_ {r}} is the power available at receiving antenna output terminals; [ 2] A r {\displaystyle A_ {r}}
Link margin. In a wireless communication system, the link margin (LKM) is a critical parameter that measures the reliability and robustness of the communication link. It is expressed in decibels (dB) and represents the difference between the minimum expected power received at the receiver's end and the receiver's sensitivity.
Marginal distribution. In probability theory and statistics, the marginal distribution of a subset of a collection of random variables is the probability distribution of the variables contained in the subset. It gives the probabilities of various values of the variables in the subset without reference to the values of the other variables.