Parameter channelFil​ter.alphaM​atrix in rayleighchan object

What does mean the parameter channelFilter.alphaMatrix? I can't find any documentation about it.

https://www.mathworks.com/matlabcentral/fileexchange/43895-ofdm-ber-vs-snr-in-frequency-selective-rayleigh-fading-channel?focused=3799806&tab=function

[Walter Roberson]

In that time frame, I replied to someone else:

The property is set up in

toolbox/comm/comm/@channel/@channelfilter/initialize.m

I am wondering if this is the a coefficients described at https://www.mathworks.com/help/comm/ug/fading-channels.html#bq5zk36 ?

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However I have not yet tracked down what the equivalent in the new comm.RayleighChannel is.