تخصیص توان در رله‌های بهره ثابت و بهره متغیر تمام دوطرفه با وجود خطای تخمین ضرایب کانال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مخابرات، دانشکده مهندسی برق و کامپیوتر دانشگاه سمنان

2 دانشکده مهندسی برق و کامپیوتر دانشگاه سمنان

چکیده

بهبود عملکرد سیستم‌های رله با استفاده از الگوهایی همانند تخصیص توان نیازمند دسترسی به ضرایب لحظه‌ای کانال است. استخراج این اطلاعات از کانال مخابراتی همواره با خطا مواجه می‌شود و این خطا علاوه بر اینکه الگوی بهینه‌سازی سیستم‌های رله را برهم می‌زند، بخش‌های نامطلوب در سیگنال دریافتی را در گیرنده افزایش می‌دهد. رله‌های بهره ثابت و متغیر هرکدام با توجه به نوع عملکرد، تأثیرپذیری متفاوتی نسبت به خطای تخمین ضرایب کانال دارند. در این مقاله با بررسی دقیق تأثیر خطای تخمین ضرایب کانال با توجه به الگوی تخمین و الگوی ارسال سمبل‌های آموزشی، تخصیص توان مناسبی برای کاهش اثرات بخش‌های نامطلوب در رله‌های بهره ثابت و بهره متغیر ارائه خواهد شد. مقالات مرجع در این موضوع برای تخصیص توان همواره از اطلاعات آماری مرتبه دوم استفاده کردند اما در این مقاله از ضرایب تخمینی استفاده خواهد شد. با توجه به پیچیدگی بیشتر عملکرد رله بهره متغیر در کنترل تأثیر کانال تداخلی در رله تمام دوطرفه، فرم بسته برای تخصیص توان ارائه می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

Power Allocation in Fixed-Gain and Variable-Gain Full-Duplex Relays with Channel Estimation Error

نویسندگان [English]

  • Mohammad Lari 1
  • Mohammad Hossein Mokhtari 2
1 Assistant Professor, Faculty of Electrical and Computer Engineering, Semnan University
2 Faculty of Electrical and Computer Engineering, Semnan University,
چکیده [English]

Improving the performance of relay systems using patterns such as power allocation requires access to instantaneous channel coefficients . extraction of this information is always prone to errors and this error increases the undesirable portions of the received signal in the receiver , in addition to disrupting the relay system optimization pattern . the Fixed and variable Gain relays , according to the type of operation , have different effect on the estimation error of channel coefficients . in this paper , with a detailed examination of the effect of the estimation error of channel coefficients according to the pattern of estimation , suitable power allocation is proposed to reduce the effects of undesirable segments in the Fixed and variable Gain operation. Reference papers in this matter for power allocation always use second - order statistical data but in this paper , the estimated coefficients will be used . due to the complexity of the performance of the variable gain relay in control of the interference channel effect in two-way relay , the closed form for power allocation is presented.

کلیدواژه‌ها [English]

  • Error estimation
  • Full-Duplex relay
  • Fixed Gain relay
  • Variable gain relay

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