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Hi Steve,<br>
<br>
"Anyone", in this case, would most likely be me. No, I have not
considered it. I'm not very familiar with digital modes; however,
perhaps this would be useful as a low-distortion compression
technique for some digital modes.<br>
<br>
As far as what we currently have with PureSignal, the algorithm has
no problem with peaks because they are totally constrained by the
look-ahead ALC. Then, to increase average power (decrease peak to
average ratio) we have the Leveler and a compressor which works like
an RF speech clipper. All these, including the PureSignal
correction, are applied at baseband. The leveler and compressor
introduce no material distortion in terms of IMD.<br>
<br>
73,<br>
Warren NR0V<br>
<br>
<div class="moz-cite-prefix">On 3/6/2014 2:52 PM, Steven B. Dick
wrote:<br>
</div>
<blockquote cite="mid:9721BAE6634246219278CBAD041F12CD@Downstairs"
type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div><font size="2" face="Arial"><span class="077404322-06032014">Has
anyone considered the use of crest factor reduction in
conjunction with PureSignal? (or does Pure Signal already
incorporate crest factor reduction?) See:</span></font></div>
<div><font size="2" face="Arial"><span class="077404322-06032014"><a
moz-do-not-send="true"
href="http://www.altera.com/end-markets/wireless/advanced-dsp/cfr/wir-cfr.html">http://www.altera.com/end-markets/wireless/advanced-dsp/cfr/wir-cfr.html</a></span></font></div>
<div><font size="2" face="Arial"><span class="077404322-06032014"></span></font> </div>
<div><font size="2" face="Arial"><span class="077404322-06032014">Crest
factor reduction is typically used in the cellular
communications industry in conjunction with digital
predistortion. Crest factor reduction eases the task of the
digital predistorter and allows inproved digital
predistorter performance. <font size="3" face="Times New
Roman">Altera has a Crest Factor Reduction reference
design which employs nonlinear saturation around the peaks
to reduce the PAR.</font></span></font></div>
<div><font size="3" face="Times New Roman"><span
class="077404322-06032014"></span></font> </div>
<div><font size="2" face="Arial"><span class="077404322-06032014">Regards,</span></font></div>
<div><font size="2" face="Arial"><span class="077404322-06032014"></span></font> </div>
<div><font size="2" face="Arial"><span class="077404322-06032014">"Digital
Steve", L1RF</span></font></div>
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