INNER CHANNEL CODEC FOR DVB-T

Abstract

Digital video broadcasting terrestrial (DVB-T) is the name of the terrestrial transmission system developed by the DVB Project. DVB-T is running in many countries all over the world. In communication systems, error correcting codes are used in detection and correction of the transmitted data errors. Convolutional encoding with Viterbi decoding used in the DVB-T system is a powerful process for forward error correction. Convolution code is a sort of error correcting code in which (k-bits) information symbol is to be encoded to (n-bits) data where (n>k). To decode the output data from the inner convolution encoder, a Viterbi decoder is used at the receiver. In 1967, Andrew J. Viterbi resolved and suggested the Viterbi decoding algorithm. It is vastly used as a decoding way for convolutional codes. This algorithm uses trellis structure, which is traced back for decoding the received information. Also, it performs maximum likely hood detection on data that is coded by the convolutional encoder. Viterbi decoding uses trellis diagram to get the output data that is most likely similar to the input sequence coming from the encoder. However, it reduces the complexity by using trellis structure. At market, almost Viterbi decoders are intellectual property (IP) core with an effective algorithm in the decoding of only one convolutional encoded sequence that is in some way expensive. In addition, the cost for the convolutional encoder and Viterbi decoder are expensive for a specified design because of the patent issue. Therefore, to obtain