رویکردی جدید برای انتقال موج میلیمتری در سیستم‌های مایمو انبوه مبتنی بر تکنولوژی دسترسی چندگانه غیرمتعامد

چکیده مقاله :

باتوجه‌به رشد ترافیک در شبکه‌های بی‌سیم، ارائه تکنیک‌های جدید برای تحقق اتصال‌گسترده، پهنای باند بیشتر و افزایش دسترسی به طیف را ضروری می‌سازد. ادغام معماری چندورودی‌چندخروجی (MIMO) انبوه و تکنولوژی دسترسی چندگانه غیرمتعامد (NOMA) به‌عنوان راه‌حلی امیدوارکننده برای گره‌گشایی تقاضای روزافزون نرخ داده از طریق گسترش فرکانس ارتباطی به باند موج‌میلیمتری و بهبود عملکرد سیستم در نظر گرفته می‌شود. در این پژوهش، یک روش انتقال موج‌میلیمتری جدید با استفاده از فناوری NOMA و مایمو انبوه با ساختار مشارکتی و سیستم آنتن توزیع شده معرفی شده است. مسئله بهینه‌سازی نرخ مجموع در سیستم پیشنهادی تحت محدودیت‌های هم‌توان و مجموع توان ایستگاه پایه در نظر گرفته شده است. به‌منظور کاهش پیچیدگی روش پیشنهادی، از روش ترکیب حداکثر نسبت بر اساس استراتژی تکراری (MRC-RS) استفاده شد. مسئله اصلی در دستیابی به بهره چندکاربره در سیستم‌های مایمو انبوه وابستگی به اطلاعات وضعیت کانال است. برای حل این مسئله، دسترسی چندگانه با تقسیم جاگذاری (IDMA) و تخمین کانال به کمک داده (DACE) ارائه شد. نتایج شبیه‌سازی نشان می‌دهد که سیستم پیشنهادی از نظر نرخ مجموع، بهره‌وری انرژی و بهره‌وری طیف به ترتیب حدود 10%، 5% و 9% نسبت به سایر روش‌های قبلی بهتر عمل می‌کند. همچنین عملکرد روش پیشنهادی در برابر مسئله آلودگی پایلوت و کاهش پیچیدگی در گیرنده در مقایسه با روش‌های قبلی حدود 21% بهبود یافته است.

چکیده انگلیسی :

With the growth of wireless network traffic, it is essential to provide new techniques to achieve wide connectivity, greater bandwidth, and increased access to the spectrum. The integration of massive Multiple-Input Multiple-Output (M-MIMO) architecture and non-Orthogonal Multiple Access (NOMA) technology is considered a promising solution for solve the increasing demand for data rate through the expansion of communication frequency to the millimeter-wave (mmWave) band and improving the system performance. In this study, we introduce a new mmWave transmission method using NOMA and MIMO technology with cooperative structure and distributed antenna system (DAS). The optimization problem of the sum rate in the proposed system is considered under the equal power constraints (EPC) and the sum power constraint (SPC) of the base station (BS). In order to reduce the complexity of the proposed method, the maximum ratio combining based on repetitive strategy (MRC-RS) was used. The main problem in achieving multi-user efficiency in M-MIMO systems is dependence on channel state information (CSI). To solve this problem, interleave division multiple access (IDMA) and data-aided channel estimation (DACE) are proposed. The simulation results show that the proposed system performs better than other previous methods in terms of sum-rate, energy efficiency (EE), and spectrum efficiency (SE) by about 10%, 5%, and 9%, respectively. Also, the performance of the proposed method against the problem of pilot contamination and reducing the complexity in the receiver has improved by about 21% compared to the previous methods.

تازه های تحقیق:

ارائه رویکردی جدید در آنتن‌های توزیع شده و مشارکتی مبتنی بر ساختار انتقال موج میلیمتری.

بهبود عملکرد سیستم در بهره‌وری انرژی و بهره‌وری طیف در روش پیشنهادی در مقایسه با روش‌های قبلی.

اعمال روش IMDA در ساختارهای مشارکتی و توزیع شده و تحلیل عملکرد سیستم بر حسب BER.

کاهش پیچیدگی روش پیشنهادی، با استفاده از روش ترکیب حداکثر نسبت بر اساس استراتژی تکراری (MRC-RS).

مقاومت در برابر آلودگی پایلوت در سیستم پیشنهادی و کاهش پیچیدگی در گیرنده.

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