نتایج جستجو برای: lt codes
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Digital fountain codes were originally packet-level forward erasure codes, but researchers have found that they are good at correcting bit errors. Modern LDPC and turbo codes have been shown to approach the Shannon limit. However, they are fixed rate codes and cannot well satisfy the Internet services that may encounter variable loss rates or asynchronous data access. For both packet and bit le...
ED INLINE CODES Inline codes, such as markers for bold or italics, links information or image references, can be represented using either an encapsulation mechanism or a placeholder method. Those are derived respectively from TMX and OpenTag. The encapsulation mechanism consists of bracketing the inline codes between special elements. XLIFF keeps a syntax very close to TMX: (begin paired-...
امروزه با افزایش جمعیت جهان و پیشرفت تکنولوژی، تقاضا برای دریافت انرژی در حال افزایش بوده و شرکت های برق نیز جهت افزایش تولید به میزان تقاضای مصرف کنندگان با مشکلات زیادی روبرو هستند. اید? اصلی در شبک? هوشمند برق آن است که بتوان با ایجاد یک ارتباط دو طرفه در تمامی محدوده های شبکه، به تولید، توزیع و مصرف بهین? برق دست یافت. بنابراین، برای پیاده سازی شبک? هوشمند، وجود یک شبک? اطلاعاتی دو طرف? مطم...
The inefficient usage of limited radio spectrum resources with its increased demand has opened the doors for an innovative communication technology. The recently proposed concept of cognitive radio network can use the licensed bands of primary users for its data transmission without causing interference to them. The LT (Luby Transform) code and Raptor code, types of Fountain codes (class of era...
Fountain codes are record-breaking sparse-graph codes for channels with erasures, such as the internet, where files are transmitted in multiple small packets, each of which is either received without error or not received. Standard file transfer protocols simply chop a file up into K packetsized pieces, then repeatedly transmit each packet until it is successfully received. A back channel is re...
Fountain codes are record-breaking sparse-graph codes for channels with erasures – such as the internet, where files are transmitted in multiple small packets, each of which is either received without error or not received. Standard file-transfer protocols simply chop a file up into K packet-sized pieces, then repeatedly transmit each packet until it is successfully received. A back-channel is ...
This paper describes a novel approach for combining Luby Transform (LT) codes and Network Coding (NC) in the context of PowerLine Communications (PLC) smart grid networks. Multihop transmissions of LT-encoded data on PLC networks are considered and algorithms to combine data at relay nodes are proposed. Without the need to decode and then re-encode the total received data stream, the relay node...
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