viewGain

Plot output receiver power or output phase shift as a function of input receiver power

Since R2024a

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    Syntax

    viewGain(recvr)
    viewGain(recvr,Type=PT)
    viewGain(recvr,Parent=hax)
    viewGain(recvr,ChannelIndex=cidx)

    Description

    View signal distortion as a function of input power

    viewGain(recvr) plots the output power of the first channel of the receiver, recvr, as a function of input power into the receiver due to the gain specified by the GainMethod property.

    example

    viewGain(recvr,Type=PT) specifies the type of plot, PT. Setting PT="AmAm" plots the receiver output power as a function of input power. Setting PT="AmPm" plots the receiver output phase shift as a function of input power. The default is "AmAm".

    viewGain(recvr,Parent=hax) plots the output receiver power or phase shift on the hax axes.

    viewGain(recvr,ChannelIndex=cidx) plots the output receiver power or phase shift for the cidx channel.

    Examples

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    Open Live Script

    Model a two-channel receiver for an LFM pulse. Construct a phased.Receiver System object™ with 20 dB Gain and set the GainMethod to "Cubic Polynomial" with an OIP3 of 30. Display the gain curve.

    fs = 10e6;
waveform = phased.LinearFMWaveform('SampleRate',fs, ...
    'PulseWidth',1e-5,'SweepBandwidth',5e6);
wav = waveform();
recvr = phased.Receiver(GainMethod="Cubic polynomial", ...
    Gain=[19,25],OIP3=[11,29],PhaseOffset=[0,45]);
y = recvr(wav);
viewGain(recvr,'ChannelIndex',1,'Parent',gca);
hold on
viewGain(recvr,'ChannelIndex',2,'Parent',gca);
legend('Channel 1, Gain = 19','Channel 2, Gain = 25', ...
    'Location','SouthEast')
hold off

    Figure contains an axes object. The axes object with title Receiver Gain Method Plot, xlabel Input Power (dBm), ylabel Output Power (dBm) contains 2 objects of type line. These objects represent Channel 1, Gain = 19, Channel 2, Gain = 25.

    Open Live Script

    Employ a receiver using a lookup table gain model to simulate non-linear gain behavior. Specify noise using noise temperature. Display the receiver phase shift.

    Create an LFM waveform using the phased.LinearFMWaveform System object™.

    fs = 1e7;
waveform = phased.LinearFMWaveform(SampleRate=fs,...
    PulseWidth=1e-5,SweepBandwidth=5e6);
wav = waveform();

    Create a receiver using the phased.Receiver System object.

    pw = [-10 -5 0 5 10 15 20 25 30 35 40]';
pw1 = ones(size(pw));
pw2 = [-3.8 -1.9 0 1.9 3.8 5.9 8.2 10 14 18 23]';
tbl = [pw,pw1,pw2];

recvr = phased.Receiver(GainMethod="Lookup table",Table=tbl, ...
    NoiseMethod="Noise temperature", ...
    NoiseTemperature=290, ...
    SampleRate=fs);

    Pass the waveform through the receiver.

    y = recvr(wav);

    Display the receiver phase shift using viewGain.

    viewGain(recvr,Type="AmPm")

    Figure contains an axes object. The axes object with title Receiver Gain Method Plot, xlabel Input Power (dBm), ylabel Phase Shift (deg) contains an object of type line.

    Input Arguments

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    Receiver, specified as a phased.Receiver System object.

    Plot type specified as "AmAm" or "AmPm". Use this argument with the Type property.

    Example: "AmPm"

    Data Types: char | string

    Name-Value Arguments

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    Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

    Example: Parent=5,ChannelIndex=3

    Parent plot axes, specified as an axes handle. When 'Parent' is not set, a new axes is created.

    Example: Parent=4

    Data Types: double

    Channel index, specified as a positive scalar.

    Example: ChannelIndex=8

    Data Types: double

    Plot type, specified as "AmAm" or "AmPm". Selecting Type="AmAm" plots the output power as a function of input power. Selecting Typo="AmPm" plots the output phase shift as a function of input power. Use this Name-value pair with the PT input argument.

    Example: Type="AmPm"

    Data Types: char | string

    Version History

    Introduced in R2024a

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    See Also