Method and arrangement for encoding and decoding a sequence of digital data

The invention charges one end of the method for encoding and decoding to the numerical data sequence, the numerical data sequence's a part is equal to the data block, the data block comprises multiple data packets, wherein the data at least two data packets comprises a to a symbol, connected by the same data block according to the symbols a specified data the position; and considering the condition of the symbols disposed on the or coding and decoding to the data.