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<para>Constructor</para>
<para>Parameters: <parameterlist kind="param"><parameteritem>
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<parametername>alpha</parametername>
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<parameterdescription>
<para>the update rate of internal running average calculations. </para>
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        <definition>int gr::digital::mpsk_snr_est_svr::update</definition>
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        <name>update</name>
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<para>Update the current registers. </para>
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        <type>double</type>
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        <argsstring>() override</argsstring>
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<para>Use the register values to compute a new estimate. </para>
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    <briefdescription>
<para>Signal-to-Variation Ratio SNR Estimator. </para>
    </briefdescription>
    <detaileddescription>
<para>This estimator actually comes from an SNR estimator for M-PSK signals in fading channels, but this implementation is specifically for AWGN channels. The math was simplified to assume a signal and noise kurtosis ( <formula id="38">$k_a$</formula> and <formula id="35">$k_w$</formula>) for M-PSK signals in AWGN. These approximations significantly reduce the complexity of the calculations (and computations) required.</para>
<para>Original paper: A. L. Brandao, L. B. Lopes, and D. C. McLernon, &quot;In-service
monitoring of multipath delay and cochannel interference for
indoor mobile communication systems,&quot; Proc. IEEE Int. Conf. Communications, vol. 3, pp. 1458-1462, May 1994.</para>
<para>Reference: D. R. Pauluzzi and N. C. Beaulieu, &quot;A comparison of SNR
estimation techniques for the AWGN channel,&quot; IEEE Trans. Communications, Vol. 48, No. 10, pp. 1681-1691, 2000. </para>
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