Apply receiver thermal noise to complex baseband signal

RF Impairments

The Receiver Thermal Noise block simulates the effects of thermal
noise on a complex, baseband signal. You can specify the amount of
thermal noise in three ways, according to which **Specification
method** you select:

`Noise temperature`

specifies the noise in degrees kelvin.`Noise factor`

specifies the noise as 1+(Noise temperature / 290).`Noise figure`

specifies the noise as 10*log10(1+(Noise temperature / 290)). This is the decibel equivalent of Noise factor.

The following scatter plot shows the effect of the Receiver
Thermal Noise block, with **Specification method** set
to `Noise figure`

and **Noise figure
(dB)** set to `3.01`

, on a signal modulated
by 16-QAM.

This plot is generated by the model described in Illustrate RF Impairments That Distort a Signal with the following parameter settings:

Rectangular QAM Modulator Baseband

**Normalization method**set to`Average Power`

**Average power (watts)**set to`1e-12`

Receiver Thermal Noise

**Specification method**set to`Noise figure`

**Noise figure (dB)**set to`3.01`

**Specification method**The method by which you specify the amount of noise. The choices are

`Noise temperature`

,`Noise figure`

, and`Noise factor`

.

**Noise temperature (K)**Scalar specifying the amount of noise in degrees kelvin.

**Noise figure**Scalar specifying the amount of noise in decibels relative to a noise temperature of 290 degrees kelvin. A

**Noise figure**setting of 0 dB indicates a noiseless system.

**Noise factor**Scalar specifying the amount of noise relative to a noise temperature of 290 degrees kelvin.

**Initial seed**The initial seed value for the random number generator that generates the noise.

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