رئیس دانشکده مهندسی برق و کامپیوتر مجله مهندسی برق دانشگاه تبریز 2008-7799 55 4 2025 12 22 Promising Practical Infrastructure Solutions for 6G Based on RIS and Cell Free Massive MIMO network راهکارهای زیرساختی عملیِ امیدبخش برای نسل ششم (6G) مبتنی بر سطوح هوشمند قابل پیکربندی (RIS) و شبکه MIMO انبوه بدون سلول بندی 665 671 19443 10.22034/tjee.2025.63976.4905 FA اکبر مظهری سرای دانشگاه صنعتی سهند افشین ابراهیمی عضو هیات علمی/دانشگاه صنعتی سهند Journal Article 2024 10 19 Cell free massive MIMO system is a promising candidate to overcome the shortcomings of the conventional cellular system and a suitable technique to achieve the goals of the sixth generation (6G) networks. Costs of implementing on large scale is one of the major disadvantages of this system. Recently, with the emergence of reconfigurable intelligent surfaces (RIS), we can hope for the reduction of these costs and the practical implementation of this system. In this regard, in this paper we have investigated the spectral performance of the scalable form of cell free with and without RISs. Lower bounds of uplink spectral efficiency involving imperfect channel estimation and pilot contamination effects for L-MMSE and LP-MMSE decoders is derived. The simulation results confirm the superior spectral efficiency performance of RIS-based proposed system (especially in centralized RIS- cell free mode) compared to the Scalable cell free system. <span class="s2"><span class="bumpedFont15">سیستم </span></span><span class="s5"><span class="bumpedFont15">MiMO</span></span><span class="s2"><span class="bumpedFont15"> انبوه بدون سلول بندی </span></span><span class="s2"><span class="bumpedFont15">یکی از گزینه‌های امیدبخش برای غلبه بر کاستی‌های سامانه‌های سلولی متعارف و روشی مناسب برای دستیابی به اهداف شبکه‌های نسل ششم</span></span><span class="s5"><span class="bumpedFont15">(6G)</span></span><span class="s2"><span class="bumpedFont15"> به شمار می رود. </span></span><span class="s2"><span class="bumpedFont15">با ا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ن</span></span><span class="s2"><span class="bumpedFont15"> حال، هز</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">نه‌ها</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> بالا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> پ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">اده‌ساز</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">در مق</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">اس</span></span><span class="s2"><span class="bumpedFont15"> بزرگ از جمله معا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ب</span></span><span class="s2"><span class="bumpedFont15"> اصل</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> ا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ن</span></span><span class="s2"><span class="bumpedFont15"> س</span></span><span class="s2"><span class="bumpedFont15">یستم</span></span><span class="s2"><span class="bumpedFont15"> است. اخ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">راً</span></span><span class="s2"><span class="bumpedFont15"> با ظهور سطوح هوشمند قابل پ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">کربند</span></span><span class="s2"><span class="bumpedFont15">ی</span></span> <span class="s5"><span class="bumpedFont15">(RIS)</span></span> <span class="s2"><span class="bumpedFont15">می‌توان به کاهش این</span></span><span class="s2"><span class="bumpedFont15">هزینه‌ها و تحقق عملی این س</span></span><span class="s2"><span class="bumpedFont15">یستم</span></span><span class="s2"><span class="bumpedFont15"> امیدوار بود</span></span><span class="s4"><span class="bumpedFont15">.</span></span><span class="s2"><span class="bumpedFont15"> د</span></span><span class="s2"><span class="bumpedFont15">ر ا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ن</span></span><span class="s2"><span class="bumpedFont15"> مقاله، عملکرد ط</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ف</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> نسخه </span></span><span class="s2"><span class="bumpedFont15">مقی</span></span><span class="s2"><span class="bumpedFont15">اس‌پذ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ر</span></span><span class="s2"><span class="bumpedFont15"> س</span></span><span class="s2"><span class="bumpedFont15">یستم</span></span><span class="s2"><span class="bumpedFont15"> بدون سلول</span></span><span class="s2"><span class="bumpedFont15"> بندی</span></span><span class="s2"><span class="bumpedFont15">، با و بدون استفاده از</span></span> <span class="s5"><span class="bumpedFont15">RIS</span></span><span class="s2"><span class="bumpedFont15">، </span></span><span class="s2"><span class="bumpedFont15">مورد بررس</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> قرار گرفته است. کران‌ها</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">پا</span></span><span class="s2"><span class="bumpedFont15">یی</span></span><span class="s2"><span class="bumpedFont15">ن</span></span><span class="s2"><span class="bumpedFont15"> بهره‌ور</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> ط</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ف</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> ل</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">نک</span></span> <span class="s2"><span class="bumpedFont15">فراسو</span></span><span class="s2"><span class="bumpedFont15"> با در نظر گرفتن تخم</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ن</span></span><span class="s2"><span class="bumpedFont15"> ناقص کانال و اثر آلودگ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> پا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">لوت</span></span><span class="s2"><span class="bumpedFont15"> برا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> آشکارسازها</span></span><span class="s2"><span class="bumpedFont15">ی</span></span> <span class="s5"><span class="bumpedFont15">L-MMSE</span></span><span class="s2"><span class="bumpedFont15"> و </span></span><span class="s5"><span class="bumpedFont15">LP-MMSE</span></span> <span class="s2"><span class="bumpedFont15">استخراج شده‌اند. نتا</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ج</span></span><span class="s2"><span class="bumpedFont15"> شب</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ه‌ساز</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> نشان م</span></span><span class="s2"><span class="bumpedFont15">ی‌</span></span><span class="s2"><span class="bumpedFont15">دهند</span></span><span class="s2"><span class="bumpedFont15"> که س</span></span><span class="s2"><span class="bumpedFont15">یستم </span></span><span class="s2"><span class="bumpedFont15">پی</span></span><span class="s2"><span class="bumpedFont15">شنهاد</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> مبتن</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> بر </span></span><span class="s5"><span class="bumpedFont15">RIS</span></span><span class="s2"><span class="bumpedFont15"> (</span></span><span class="s2"><span class="bumpedFont15">به‌و</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ژه</span></span><span class="s2"><span class="bumpedFont15"> در حالت </span></span><span class="s5"><span class="bumpedFont15">RIS</span></span><span class="s2"><span class="bumpedFont15"> متمرکز</span></span><span class="s2"><span class="bumpedFont15">بدون</span></span> <span class="s2"><span class="bumpedFont15">سلول بندی ) </span></span><span class="s2"><span class="bumpedFont15">از</span></span> <span class="s2"><span class="bumpedFont15">نظر</span></span> <span class="s2"><span class="bumpedFont15">بهره‌وری</span></span><span class="s2"><span class="bumpedFont15"> ط</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ف</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">،</span></span><span class="s2"><span class="bumpedFont15"> عملکرد</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15"> برتر نسبت به س</span></span><span class="s2"><span class="bumpedFont15">یستم</span></span> <span class="s2"><span class="bumpedFont15">بدون</span></span> <span class="s2"><span class="bumpedFont15">سلول</span></span><span class="s2"><span class="bumpedFont15"> بندی</span></span> <span class="s2"><span class="bumpedFont15">مقی</span></span><span class="s2"><span class="bumpedFont15">اس‌پذ</span></span><span class="s2"><span class="bumpedFont15">ی</span></span><span class="s2"><span class="bumpedFont15">ر</span></span><span class="s2"><span class="bumpedFont15"> دارد.</span></span> https://tjee.tabrizu.ac.ir/article_19443_8aad936181cc8099784d46fb2153a4e1.pdf