Ethernet Forward Error Correction
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(Discuss) Proposed since January 2015. In telecommunication, information theory, and coding theory, forward error correction (FEC) or channel fec in ethernet coding[1] is a technique used for controlling errors in data forward error correction tutorial transmission over unreliable or noisy communication channels. The central idea is the sender encodes the message forward error correction ppt in a redundant way by using an error-correcting code (ECC). The American mathematician Richard Hamming pioneered this field in the 1940s and invented the first
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error-correcting code in 1950: the Hamming (7,4) code.[2] The redundancy allows the receiver to detect a limited number of errors that may occur anywhere in the message, and often to correct these errors without retransmission. FEC gives the receiver the ability to correct errors without needing a reverse channel to request retransmission forward error correction algorithm of data, but at the cost of a fixed, higher forward channel bandwidth. FEC is therefore applied in situations where retransmissions are costly or impossible, such as one-way communication links and when transmitting to multiple receivers in multicast. FEC information is usually added to mass storage devices to enable recovery of corrupted data, and is widely used in modems. FEC processing in a receiver may be applied to a digital bit stream or in the demodulation of a digitally modulated carrier. For the latter, FEC is an integral part of the initial analog-to-digital conversion in the receiver. The Viterbi decoder implements a soft-decision algorithm to demodulate digital data from an analog signal corrupted by noise. Many FEC coders can also generate a bit-error rate (BER) signal which can be used as feedback to fine-tune the analog receiving electronics. The noisy-channel coding theorem establishes bounds on the theoretical maximum information transfer rate
applies forward error correction (FEC) coding to transmitted packets. The FEC coding is systematic block coding, and is applied so that the coded packets can be interpreted by legacy network forward error correction rate devices that are not capable of FEC decoding. The...http://www.google.com/patents/US7343540?utm_source=gb-gplus-sharePatent
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Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7343540 B2Publication typeGrantApplication numberUS 10/496,134PCT numberPCT/IB2002/001370Publication dateMar 11, 2008Filing dateApr 25, https://en.wikipedia.org/wiki/Forward_error_correction 2002Priority dateApr 25, 2002Fee statusPaidAlso published asCN1625859A, CN100576785C, US20050005189, WO2003092207A1Publication number10496134, 496134, PCT/2002/1370, PCT/IB/2/001370, PCT/IB/2/01370, PCT/IB/2002/001370, PCT/IB/2002/01370, PCT/IB2/001370, PCT/IB2/01370, PCT/IB2001370, PCT/IB2002/001370, PCT/IB2002/01370, PCT/IB2002001370, PCT/IB200201370, PCT/IB201370, US 7343540 B2, US 7343540B2, US-B2-7343540, US7343540 B2, US7343540B2InventorsLior Khermosh, Ariel Maislos, Onn HaranOriginal AssigneePmc - Sierra Israel Ltd.Export CitationBiBTeX, EndNote, http://www.google.com/patents/US7343540 RefManPatent Citations (5), Non-Patent Citations (2), Referenced by (66), Classifications (9), Legal Events (4) External Links:USPTO, USPTO Assignment, EspacenetForward error correction coding in ethernet networks US 7343540 B2Abstract A method for improving the bit error rate of Ethernet packets applies forward error correction (FEC) coding to transmitted packets. The FEC coding is systematic block coding, and is applied so that the coded packets can be interpreted by legacy network devices that are not capable of FEC decoding. The transmit and receive state machines of FEC-capable Ethernet nodes are modified to enable the nodes to encode and/or decode the packets with the FEC code, and to adapt the nodes' respective medium access layer (MAC) and physical layer (PHY) data rates. Images(13)Claims(48) 1. A method for sending data packets from a transmitter to a receiver through a sh
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