<p>This is pure host side UHD update (UHD driver as you call it).</p>
<p>Sent from my Android device.</p>
<p>--<br>
Regards,<br>
Alexander Chemeris<br>
CEO, Fairwaves LLC<br>
<a href="http://fairwaves.ru">http://fairwaves.ru</a></p>
<div class="gmail_quote">20.03.2013 16:47 пользователь "Craig Reading" <<a href="mailto:craig.reading1@gmail.com">craig.reading1@gmail.com</a>> написал:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto"><div>Alexander</div><div><br></div><div>Is this a firmware update or UHD driver update? If firmware would it be possible to upload an image?</div><div><br>Regards<div>Craig</div></div><div><br>Begin forwarded message:<br>
<br></div><blockquote type="cite"><div><b>From:</b> <a href="mailto:umtrx-request@lists.osmocom.org" target="_blank">umtrx-request@lists.osmocom.org</a><br><b>Date:</b> 19 March 2013 20:36:34 GMT<br><b>To:</b> <a href="mailto:umtrx@lists.osmocom.org" target="_blank">umtrx@lists.osmocom.org</a><br>
<b>Subject:</b> <b>UmTRX Digest, Vol 9, Issue 16</b><br><b>Reply-To:</b> <a href="mailto:umtrx@lists.osmocom.org" target="_blank">umtrx@lists.osmocom.org</a><br><br></div></blockquote><blockquote type="cite"><div><span>Send UmTRX mailing list submissions to</span><br>
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<span>than "Re: Contents of UmTRX digest..."</span><br><span></span><br><span></span><br><span>Today's Topics:</span><br><span></span><br><span>   1. Tx signal quality improvement (Alexander Chemeris)</span><br>
<span></span><br><span></span><br><span>----------------------------------------------------------------------</span><br><span></span><br><span>Message: 1</span><br><span>Date: Wed, 20 Mar 2013 00:33:29 +0400</span><br><span>From: Alexander Chemeris <<a href="mailto:alexander.chemeris@gmail.com" target="_blank">alexander.chemeris@gmail.com</a>></span><br>
<span>To: umtrx <<a href="mailto:umtrx@lists.osmocom.org" target="_blank">umtrx@lists.osmocom.org</a>></span><br><span>Subject: Tx signal quality improvement</span><br><span>Message-ID:</span><br><span>    <<a href="mailto:CABmJbFV4C0_WBCBuj61U8_2bQjm9x049ciB0yYQDjJdoHxiNGg@mail.gmail.com" target="_blank">CABmJbFV4C0_WBCBuj61U8_2bQjm9x049ciB0yYQDjJdoHxiNGg@mail.gmail.com</a>></span><br>
<span>Content-Type: text/plain; charset="utf-8"</span><br><span></span><br><span>Hi all,</span><br><span></span><br><span>I've found an issue with out Tx configuration of LMS which led to</span><br><span>constant phase rotation of the transmitted signal. After fixing this</span><br>
<span>issue I get quite better signal quality on transmit side. I advise</span><br><span>everyone to update to the most recent UHD on the host side to benefit</span><br><span>from this improvement.</span><br><span></span><br>
<span>The reason for the issue was that we used the wrong polarity of TX_</span><br><span>IQ_SEL. As a result, LMS transmitted I from one sample and Q from the</span><br><span>other sample. One of the visible results was a huge I/Q imbalance on</span><br>
<span>Tx which made it impossible to use multi-ARFCN configurations. We've</span><br><span>solved this issue in software by setting tx_fsinc_polarity and</span><br><span>tx_interleave_mode to proper values in LMS configuration registers.</span><br>
<span></span><br><span>Attached screenshots from our E4406A shows signal quality transmitted</span><br><span>by OpenBTS we could have now. Tests are performed with "laurent"</span><br><span>branch of Fairwaves, compiled with SPS (samples per symbol) set to 4.</span><br>
<span>DC offset and I/Q imbalance are calibrated.</span><br><span></span><br><span>screen2.gif, screen3.gif - constellation and phase error when LO</span><br><span>leakage is at the center of the signal spectrum, i.e. with no LO</span><br>
<span>offset on Tx.</span><br><span></span><br><span>screen4.gif, screen5.gif - constellation and phase error when DC</span><br><span>offset is when LO leakage is shifted to 300kHz away from the signal</span><br><span>spectrum center, i.e, with 300kHz LO offset on Tx.</span><br>
<span></span><br><span>screen6.gif - phase error per symbol plots for the same settings as</span><br><span>with screen4.gif and screen5.gif.</span><br><span></span><br><span>When we implement a true GMSK transmitter we should be able to get</span><br>
<span>even better phase noise parameters, meaning excellent downlink signal</span><br><span>quality. But even this values are much better than required by the</span><br><span>Standard.</span><br><span></span><br><span>--</span><br>
<span>Regards,</span><br><span>Alexander Chemeris.</span><br><span>CEO, Fairwaves LLC / ??? ???????</span><br><span><a href="http://fairwaves.ru" target="_blank">http://fairwaves.ru</a></span><br><span>-------------- next part --------------</span><br>
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<span></span><br><span>------------------------------</span><br><span></span><br><span>_______________________________________________</span><br><span>UmTRX mailing list</span><br><span><a href="mailto:UmTRX@lists.osmocom.org" target="_blank">UmTRX@lists.osmocom.org</a></span><br>
<span><a href="http://lists.osmocom.org/cgi-bin/mailman/listinfo/umtrx" target="_blank">http://lists.osmocom.org/cgi-bin/mailman/listinfo/umtrx</a></span><br><span></span><br><span></span><br><span>End of UmTRX Digest, Vol 9, Issue 16</span><br>
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