طراحی و ارزیابی کارآیی روش‌های کاهش PAPR در لینک فروسوی سیستم‌های OFDM-NOMA بر پایه ارسال جزئی دنباله

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی برق مخابرات ،دانشکده مهندسی برق و کامپیوتر ،دانشگاه تبریز ،تبریز ،ایران

2 گروه مهندسی مخابرات دانشکده مهندسی برق و کامپیوتر - دانشگاه تبریز

چکیده

ظهور تکنولوژی­های جدید مانند اینترنت اشیاء و سیستم­های جدید مخابرات و پخش بی­سیم نیاز به نرخ داده بالاتر، اتصال گسترده، پوشش بهتر و بقیه بهبودها را دو چندان کرده­است. سیستم ادغام تقسیم فرکانسی متعامد (OFDM) بر اساس دسترسی چندگانه غیرمتعامد (NOMA) یکی از روش­های نویدبخش برای استفاده در لایه فیزیکی سیستم­های مخابراتی جدید است. با استفاده از روش مدولاسیون تقسیم فرکانسی متعامد، تداخل بین سمبلی بوجود آمده به دلیل گستره تأخیرکانال بی­سیم حدف و نرخ ارسال داده بالا قابل دسترسی می­شود. از طرف دیگر، در روش دسترسی چندگانه غیرمتعامد با اشتراک گذاری منابع فرکانسی بین چندین کاربر، بهره وری طیفی سیستم افزایش می­یابد. به همین دلیل، سیستم­های ادغام تقسیم فرکانسی متعامد بر اساس دسترسی چندگانه غیرمتعامد می­توانند نرخ داده را در سیستم­های نوین مخابراتی به شکل قابل­توجهی افزایش دهند.  نسبت بیشینه توان به میانگین توان (PAPR) بالا یکی از مشکلات اصلی سیستم­های ادغام تقسیم فرکانسی متعامد است که باعث می­شود تقویت کننده توان در ناحیه غیرخطی کار کند و کارآیی سیستم کاهش یابد. بدلیل خواص خاص سیستم­های OFDM-NOMA، بیشتر روش­های کاهش PAPR مناسب این سیستم­ها نیستند. در این مقاله، عملکرد سه روش مختلف کاهش PAPR بر اساس روش ارسال جزئی دنباله (PTS) را برای استفاده در لینک فروسو سیستم OFDM-NOMA مورد مطالعه و بررسی قرار می­دهیم. هر کدام از روش­های پیشنهاد شده را به کمک بلوک دیاگرام­های مربوطه توصیف می­کنیم. در نهایت، مناسب­ترین روش را از لحاظ پیچیدگی محاسباتی، کاهش PAPR و نرخ خطای بیت برای استفاده در لینک فروسو سیستم­های OFDM-NOMA پیشنهاد می­کنیم.

کلیدواژه‌ها

عنوان مقاله [English]

Design and Performance Evaluation of PTS-Based PAPR Reduction Methods for the Downlink of OFDM-NOMA Systems

نویسندگان [English]

  • reza sayyari 1
  • Jafar Pourrostam 2
1 Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
2 Faculty of Electrical and Computer Engineering,University of Tabriz
چکیده [English]

Advent of new systems, such as the Internet of Things (IoT) and novel communication and broadcasting systems, calls for higher data rates, massive connectivity, better cell coverage, and other improvements. Orthogonal frequency division multiplexing (OFDM) and non-orthogonal multiple access (NOMA) are amongst the promising modulation and multiple access schemes which are candidates to be implemented in the physical layer of the new systems. High data rates are achievable via OFDM which mitigates Inter-Symbol Interference (ISI) caused by the delay spread of the wireless channels. On the other hand, NOMA improves the spectral efficiency of the system by allowing users to share frequency band resources. Therefore, OFDM based NOMA (OFDM-NOMA) techniques have the potential to considerably increase the attainable data rate in novel communication systems. High peak-to-average power ratio (PAPR) is one of the issues in OFDM systems which makes high-power amplifier (HPA) to work in the non-linear region and degrades system performance. Due to the special properties of OFDM-NOMA systems, most of the PAPR reduction methods are not suitable for them. In this paper, we analyze the performance of three PTS-based PAPR reduction methods in OFDM-NOMA systems. Functional block diagram of these schemes is presented. Finally, we will compare their computational complexity, PAPR reduction, and system bit error rate (BER) performance to select the most proper PAPR reduction scheme for OFDM-NOMA systems.

کلیدواژه‌ها [English]

  • New Generation of Wireless Systems
  • Orthogonal Frequency Division Multiplexing (OFDM)
  • Non-Orthogonal Multiple Access (NOMA)
  • Peak-to-Average Power Ratio (PAPR)
  • Partial Transmit Sequence (PTS)

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