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اطلاعاتی فرکانسی چه مفهومی دارند

فرکانس که کاملا مشخصه:تعداد نوسانات کامل موج ارسالی در واحد زمان (ثانیه).عددی ک نوشتید 11054 برحسب مگاهرتز هست

27500 همون سیمبول ریت هست.یعنی تعداد مگابایتهای مدولاسیون شده در واحد زمان…هرچی این عدد بیشتر باشه اصطلاحا reliablity (اعتماد پذیری) اون فرکانس بالاتره و قویتر هست…تا اونجا ک اطلاع دارم هر چی این عدد بیشتر باشه سازمان فرستنده بابت اون مبلغ بیشتری رو دریافت میکنه.

3/4 عدد FEC هست…Forwarding Error Correction
هر موجی که به گیرنده میرسه مقداری از اطلاعات باینری یا هگزادسیمالی اون که در نهایت به تصویر کامل تبدیل میشه به هر علتی ممکنه ناقص بشه (Lost بشه)…بنابراین با درنظر گرفتن مقداری از بایتهای ارسال شده برای تصحیح،عملا اررور های ایجاد شده تصحیح میشن.
عدد 3/4 یعنی از هر 4 بایت ارسالی، 3 بایت اون اطلاعات اصلی و 1 بایت برای تصحیح هست.

افقی/عمودی بودن یک موج، ساعت مدول شده ی اون رو میرسونه…در واقع یک ویژگی برای امواج عرضی (مثل نور یا سایر امواج اکترومغناطیس) هست که نسبت قرار گیری راستای انتشار اون موج نسبت به راستای نوسان اون رو مشخص میکنه…این ویژگی باعث میشه شما بتونید در یک فرکانس دو سری موج را انتشار کنید (بدون تداخل)
این راستا اگر در راستای افقی انشتار موج باشه، افقی و اگه عمود بر انتشار باشه، عمودی نام داره.

نوشته شده به وسيله ramin_malek در ماهواره ، ديدگاه ‌ها (261)


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