Iranian Communication and Information Technology
فصلنامه فناور اطلاعات و اتباطات ایران
فصلنامه فناوری اطلاعات
Engineering & Technology
http://jor.iranaict.ir
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admin
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jalali
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gregorian
2009
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fulltext
fa
تأثیر عدم توازنIQ برنرخ خطای بیت مدولاسیون تطبیقی در سیستمهای MIMO
The Impact of IQ Imbalance on the BER of Adaptive Modulation in the MIMO System
فناوری اطلاعات و ارتباطات
ICT
پژوهشي
Research
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<p class="MsoNormal" dir="rtl" style="text-align: right direction: rtl unicode-bidi: embed"><b><span lang="FA" style="font-size: 13pt">چکیده<a href="#_ftn1" name="_ftnref1"><span class="MsoFootnoteReference"><span style="color: white"><span dir="ltr"><span class="MsoFootnoteReference"><b><span style="font-size: 13pt"></span></b></span></span></span></span></a></span></b></p>
<p class="MsoNormal" dir="rtl" style="text-align: justify direction: rtl unicode-bidi: embed"><span lang="AR-SA" style="font-size: 11pt">در این
مقاله تاثیر عدم توازن </span><span dir="ltr" style="font-size: 9pt">I</span><span dir="ltr" style="font-size: 9pt">Q</span><a href="#_ftn2" name="_ftnref2"><span class="MsoFootnoteReference"><span lang="AR-SA" style="font-size: 11pt"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[2]</span></span></span></span></span></a><span lang="AR-SA" style="font-size: 11pt">
بر مدولاسیون تطبیقی </span><span dir="ltr" style="font-size: 9pt">MQAM</span><span dir="rtl"></span><span lang="AR-SA" style="font-size: 11pt"><span dir="rtl"></span> در سیستمهای </span><span dir="ltr" style="font-size: 9pt">MIMO</span><span dir="rtl"></span><span lang="AR-SA" style="font-size: 11pt"><span dir="rtl"></span> با گیرنده تبدیل مستقیم<a href="#_ftn3" name="_ftnref3"><span class="MsoFootnoteReference"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[3]</span></span></span></span></a>،
بررسی میشود. مدولاسیون تطبیقی توان-پیوسته نرخ-گسسته در سیستمهای </span><span dir="ltr" style="font-size: 9pt">MIMO</span><span dir="rtl"></span><span lang="AR-SA" style="font-size: 11pt"><span dir="rtl"></span> به
همراه اطلاعات کامل کانال<a href="#_ftn4" name="_ftnref4"><span class="MsoFootnoteReference"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[4]</span></span></span></span></a> در
فرستنده و گیرنده، در نظر گرفته میشود. مکانیزم تطبیق انتخاب شده به این صورت است
که توان ارسالی و منظومه<a href="#_ftn5" name="_ftnref5"><span class="MsoFootnoteReference"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[5]</span></span></span></span></a>
ارسالی تحت محدودیتهای توان ارسالی متوسط و احتمال خطای بیت<a href="#_ftn6" name="_ftnref6"><span class="MsoFootnoteReference"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[6]</span></span></span></span></a> (</span><span dir="ltr" style="font-size: 9pt">BER</span><span dir="rtl"></span><span lang="AR-SA" style="font-size: 11pt"><span dir="rtl"></span>)
لحظهای، تغییر داده میشود تا بازده طیفی متوسط<a href="#_ftn7" name="_ftnref7"><span class="MsoFootnoteReference"><span dir="ltr"><span class="MsoFootnoteReference"><span style="font-size: 9pt">[7]</span></span></span></span></a> ماکزیمم
شود. در ابتدا رابطه بستهای برای احتمال خطای بیت مدولاسیون </span><span dir="ltr" style="font-size: 9pt">MQAM</span><span dir="rtl"></span><span lang="FA" style="font-size: 11pt"><span dir="rtl"></span> تحت تاثیر عدم توازن </span><span dir="ltr" style="font-size: 9pt">IQ</span><span dir="rtl"></span><span style="font-size: 11pt"><span dir="rtl"></span> </span><span lang="AR-SA" style="font-size: 11pt">معرفی
میشود سپس تاثیر عدم توازن </span><span dir="ltr" style="font-size: 9pt">I</span><span dir="ltr" style="font-size: 9pt">Q</span><span dir="rtl"></span><span lang="FA" style="font-size: 11pt"><span dir="rtl"></span>،</span><span lang="AR-SA" style="font-size: 11pt"> بر
اساس روابط تحلیلی، بر نرخ خطای بیت مدولاسیون تطبیقی در </span><span dir="ltr" style="font-size: 9pt">MIMO</span><span dir="rtl"></span><span lang="AR-SA" style="font-size: 11pt"><span dir="rtl"></span> بررسی میشود. همچنین میزان
این تاثیر به ازاء تعداد مختلف آنتن فرستنده و گیرنده مشاهده خواهد شد. نتایج
روابط تحلیلی حاصل از این مقاله با نتایج شبیهسازی مونت کارلو نیز مقایسه میشوند
تا میزان صحت این روابط بررسی شود.</span><span dir="ltr"></span><span dir="ltr"><span dir="ltr"></span> </span></p>
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<p class="MsoFootnoteText" dir="rtl" style="text-align: right direction: rtl unicode-bidi: embed"><a href="#_ftnref1" name="_ftn1"></a><span dir="rtl"></span><span lang="AR-SA" style="font-size: 9pt"><span dir="rtl"></span></span><span lang="FA" style="font-size: 8pt font-family: Lotus"> </span><span dir="ltr"></span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref2" name="_ftn2"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[2]</span></span></span></a><span style="font-size: 9pt">.IQ imbalance</span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref3" name="_ftn3"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[3]</span></span></span></a><span style="font-size: 9pt">.Direct conversion receiver</span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref4" name="_ftn4"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[4]</span></span></span></a><span style="font-size: 9pt">.Perfect channel state information</span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref5" name="_ftn5"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[5]</span></span></span></a><span style="font-size: 9pt">.Constellation</span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref6" name="_ftn6"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[6]</span></span></span></a><span style="font-size: 9pt">.Bit error rate</span></p>
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<p class="MsoFootnoteText"><a href="#_ftnref7" name="_ftn7"><span style="font-size: 9pt"><span><span style="font-size: 9pt">[7]</span></span></span></a><span style="font-size: 9pt">.Average spectral efficiency</span></p>
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<b>Abstract</b><br> The effect of IQ imbalance on adaptive MQAM modulation in MIMO systems with direct conversion receivers is investigated in this paper. A continues power, discrete rate adaptive modulation scheme in using MIMO system with perfect channel information in both transmitter and receiver is considered. The selected adaptation mechanism changes the transmit power and transmit constellation size under an average transmit power and instantaneous bit error rate (BER) constraints to obtain the maximum average spectral efficiency. First, a closed from expression for the BER of MQAM modulation under the effect of IQ imbalance is introduce. Then, the impact of IQ imbalance on the BER of adaptive modulation in MIMO system is studied. This effect is also investigated for the different configuration of trancmit-recive antenna. The analytic results are compared with the Mont Carlo simulation results to verify the analytic expression.
مدولاسیون تطبیقی، نرخ خطای بیت، عدم توازن
adaptive modulation, bit error rate, IQ imbalance, MIMO
1
8
http://jor.iranaict.ir/browse.php?a_code=A-10-354-1&slc_lang=fa&sid=1
Mohammadreza
Keshavarzi
محمد رضا
کشاورزی
mrkeshavarzi@aut.ac.ai
1003194753284600515
1003194753284600515
Yes
Microwave / Millimeter Wave & Wireless Communication Research Lab
آزمایشگاه تحقیقاتی مایکروویو/ موج میلیمتری و مخابرات بدون سیم
Abbas
Mohammadi
عباس
محمدی
1003194753284600516
1003194753284600516
No
Electrical Engineering Department, Amir kabir University
دانشکده مهندسی برق، دانشگاه صنعتی امیرکبیر
Abdolali
Abdipour
* عبدالعلی
عبدیپور
1003194753284600517
1003194753284600517
No
Electrical Engineering Department, Amir kabir University
دانشکده مهندسی برق، دانشگاه صنعتی امیرکبیر