Search results
Results from the WOW.Com Content Network
The codes that they are given are called folded Reed-Solomon codes which are nothing but plain Reed-Solomon codes but viewed as a code over a larger alphabet by careful bundling of codeword symbols. Because of their ubiquity and the nice algebraic properties they possess, list-decoding algorithms for Reed–Solomon codes were a main focus of ...
A copy of the code book had been captured from U-110 on 9 May 1941. A similar coding system was used for weather reports from U-boats, the Wetterkurzschlüssel, (Weather Short Code Book). A copy of this had been captured from U-559 on 29 or 30 October 1942. [160]
relatively strong: 1: 111: strongest: 1: ... A hardware viterbi decoder of punctured codes is commonly implemented in such a way: A depuncturer, which transforms the ...
For a turbo code decoder, the front end would provide an integer measure of how far the internal voltage is from the given threshold. To decode the m + n -bit block of data, the decoder front-end creates a block of likelihood measures, with one likelihood measure for each bit in the data stream.
Hence the rate of Hamming codes is R = k / n = 1 − r / (2 r − 1), which is the highest possible for codes with minimum distance of three (i.e., the minimal number of bit changes needed to go from any code word to any other code word is three) and block length 2 r − 1.
The first element of a CIRC decoder is a relatively weak inner (32,28) Reed–Solomon code, shortened from a (255,251) code with 8-bit symbols. This code can correct up to 2 byte errors per 32-byte block.
Syndrome decoding is a highly efficient method of decoding a linear code over a noisy channel, i.e. one on which errors are made. In essence, syndrome decoding is minimum distance decoding using a reduced lookup table. This is allowed by the linearity of the code. [3]
The Vigenère cipher gained a reputation for being exceptionally strong. Noted author and mathematician Charles Lutwidge Dodgson (Lewis Carroll) called the Vigenère cipher unbreakable in his 1868 piece "The Alphabet Cipher" in a children's magazine. In 1917, Scientific American described the Vigenère cipher as "impossible of translation".