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انجام پروژه های مهندسی برق - حسگری طیفی پهن باند در شبکه های رادیو شناختی
حسگری طیفی پهن باند در شبکه های رادیو شناختی
چهارشنبه 23 دی 1394 ساعت 03:24 ب.ظ | نوشته ‌شده به دست رسول نیک بخت | ( نظرات )

حسگری طیفی[1]مقاوم به نویز یکی از نیازهای اساسی شبکه‌های رادیوشناختی[2] است و هرچه قدر طیف مورد بررسی پهن‌تر باشد فرصت‌های طیفی[3] بیشتری در دسترس کاربران رادیوشناختی قرار می‌گیرد. منظور از حسگری طیفی پهن­باند، این است که پهنای باند مورد بررسی حسگری طیفی، از حداکثر پهنای باند مورداستفاده درروش‌های حسگری طیفی باند باریک به‌مراتب بیشتر باشد .


برای حسگری طیفی پهن‌باند[4] استفاده از روش­های مرسوم حسگری طیفی (روش‌های باند باریک) به علت وابسته بودن به نمونه‌برداری نرخ نایکوئیست، بسیار پرهزینه می‌باشد [1]. از طرفی استفاده از طیف  الکترومغناطیسی در محدوده­ی چند مگاهرتز تا چندین گیگاهرتز  بسیار تنک[5] می­­باشد [2-4].  پس می‌توان با استفاده از  تئوری حسگری فشرده[6] و کاهش نرخ نمونه‌برداری، عمل حسگری طیفی پهن‌باند را با هزینه کمتری انجام داد. این ایده برای اولین بار در [5] مطرح شد ولی استفاده از آن نیازمند نمونه­برداری نرخ نایکوئیست بود و لذا از مزیت اصلی حسگری فشرده بهره‌مند نمی‌شد. برای حل این مشکل، حسگری فشرده پهن‌باند با استفاده از مبدل آنالوگ به اطلاعات (AIC[7]) پیشنهاد شد [6] .




[1] Spectrum sensing

[2] Cognitive radios

[3] Spectrum opportunity

[4] Wideband spectrum sensing

[5] Sparse

[6] Compressive sensing

[7] Analog to information convertor 


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