noisepow
Receiver noise power
Syntax
NPOWER = noisepow(NBW,NF,REFTEMP)
Description
returns
the noise power, NPOWER
= noisepow(NBW
,NF
,REFTEMP
)NPOWER
, in watts for a receiver.
This receiver has a noise bandwidth NBW
in hertz,
noise figure NF
in decibels, and reference temperature REFTEMP
in
degrees kelvin.
Input Arguments
|
The noise bandwidth of the receiver in hertz. For a superheterodyne receiver, the noise bandwidth is approximately equal to the bandwidth of the intermediate frequency stages [1]. |
|
Noise figure. The noise figure is a dimensionless quantity that indicates how much a receiver deviates from an ideal receiver in terms of internal noise. An ideal receiver only produces the expected thermal noise power for a given noise bandwidth and temperature. A noise figure of 1 indicates that the noise power of a receiver equals the noise power of an ideal receiver. Because an actual receiver cannot exhibit a noise power value less than an ideal receiver, the noise figure is always greater than or equal to one. |
|
Reference temperature in degrees kelvin. The temperature of the receiver. Typical values range from 290–300 degrees kelvin. |
Output Arguments
|
Noise power in watts. The internal noise power contribution of the receiver to the signal-to-noise ratio. |
Examples
References
[1] Skolnik, M. Introduction to Radar Systems. New York: McGraw-Hill, 1980.