<p><span class="h-card" translate="no"><a href="https://mastodon.social/@whitequark" class="u-url mention">@<span>whitequark</span></a></span> cstone did AMPS in GNU Radio a while back <a href="https://github.com/unsynchronized/gr-amps" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://</span><span class="ellipsis">github.com/unsynchronized/gr-a</span><span class="invisible">mps</span></a></p>