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Receiver Thermal Noise

Apply receiver thermal noise to complex baseband signal

Library

RF Impairments

Description

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 K.

  • Noise figure specifies the receiver noise in dB for an input noise temperature of 290 K. This is the decibel equivalent of the noise factor.

  • Noise factor specifies the receiver noise for an input noise temperature of 290 K. This is the linear equivalent of the noise figure.

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

Parameters

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 K.

Noise figure (dB)

Scalar specifying the amount of noise in dB relative to a noise temperature of 290 degrees K. This parameter specifies the noise contribution of the receiver circuitry only. To add the effects of antenna noise, select the Add 290K antenna noise check box.

Noise factor

Scalar specifying the amount of noise relative to a noise temperature of 290 degrees K. This parameter specifies the noise contribution of the receiver circuitry only. To add the effects of antenna noise, select the Add 290K antenna noise check box.

Add 290K antenna noise

Select this check box to add 290 K antenna noise to the signal. This parameter is available when Specification method is Noise figure or Noise factor.

Initial seed

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

Introduced before R2006a

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