مخابره مطمئن بی‌سیم بر مبنای وضعیت لینک غیر ایده‌آل با استفاده از ترکیب بهینه AMC و ARQ
محورهای موضوعی : مهندسی برق و کامپیوترمهرداد تاکي 1 , رضا مهین زعیم 2
1 - دانشگاه قم
2 - دانشگاه اصفهان
کلید واژه: تطبیق لینک گسسته کدینگ و مدولاسیون وفقی (AMC) بازارسال خودکار (ARQ) مخابره مطمئن,
چکیده مقاله :
در این مقاله روشی برای مخابره مطمئن اطلاعات (با احتمال خطای متمایل به صفر) در یک لینک مخابراتی بی‌سیم ارائه می‌شود که در آن برای مقابله با اثرات فیدینگ و چندمسیرگی از کدینگ و مدولاسیون وفقی (AMC) استفاده شده است. با استفاده از روش‌های کدینگ متداول حد کمی از احتمال خطا در سیستم باقی می‌ماند که به صفر رساندن آن مستلزم استفاده از توان ارسالی بسیار زیاد و یا کلمات کد به طول بی‌نهایت است و در عمل ممکن نیست. وظیفه از بین بردن میزان خطای باقیمانده بر عهده سیستم بازارسال خودکار (ARQ) است. البته اگر کدینگ تصحیح خطای مورد استفاده ضعیف باشد تعداد بازارسال‌های مورد نیاز زیاد خواهد بود و این امر گذردهی سیستم را به شدت خراب می‌کند. در این مقاله روشی برای ترکیب بهینه روش تصحیح خطا در تطبیق لینک و روش تشخیص خطا و بازارسال ارائه می‌شود. از طرف دیگر به علت متغیر با زمان بودن کانال‌ها و خطاهای تخمین و چندی‌سازی (Quantization)، در عمل وضعیت دقیق لینک برای تنظیم نرخ ارسال در اختیار نیست. در این مقاله، روش جدیدی برای تطبیق لینک بر مبنای وضعیت لینک غیر ایده‌آل نیز ارائه می‌شود. بررسی‌های عددی کارامدی روش طراحی‌شده را نشان می‌دهند.
In this paper, a new scheme for completely reliable transmission of the information (with an error probability tends to zero) in a wireless communication link will be proposed in which to compensate the effects of fading and multipath, adaptive modulation and coding is used. Obviously, by the practical forward error correction it is impossible to achieve error free communication. Removing the residual error is by an auto-forwarding system. Of course, if error correction coding capability is weak, number of retransmissions will be increased to the much needed and it severely undermines the system throughput. On the other hands, strong error correction capability needs high block length codes and high transmission power which are limited in practice. In this paper, a method for optimum combination of error correction and auto forwarding is provided. In this paper, link adaptation is based on imperfect channel state information. Numerical results demonstrate efficiency of designed method.
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