Overlap More Than One Code Word Encoding And Decoding Principle And Methods

In the coding fields, there is much powerful technique for constructing long powerful codes from short component codes, and the performance is nice. It is not only good for promotion the performance of the original code, but also the transmission of the information, and we can construct different length of new codes with different correcting capacity in special channel.In this paper, a new coding algorithm is put forward based on known block code. Through exchanging some of symbol or bits in codes, encodes the new, and gets the information by iterative decoding and overlapping symbol or bits.The performance of this new method is expected to be better than the original codes, even more than some long powerful codes, such as RS codes. The main results in this paper are as follows:1. New codes are constructed by existing known short codes, what is discussed in this paper.2. The ability to block codes and maximum likelihood error decoding are introduced, and the coding principle of cyclic codes is discussed. Compares the complete codes with incomplete codes, and then introduces Golay codes and RS codes.3. Detailed introduces the new method of coding and decoding based on Golay codes, and points out that the key to promote the performance is iterative decoding. Based on the key step, the iterative decoding is improved. The whole progress of overlapping decoding is made better by adding same steps, and the influence of the different parameters on coding is discussed. According to simulation, the promotion of Signal-to-Noise between this new method and the truncate codes with the same bit rate is 1dB; when the Eb/N0 is 10dB, the improvement of the error bit probability between this new method and the original codes is 10 -10.4. Based on the simulation for RS code with different codes length, analyzes of the new method of coding and decoding based on RS code. A new overlapping of principle of encoding and decoding is introduced, and the performance of this new method is compared with original RS code and the shorten code. According to simulation, when the error bit probability is 3×10?8, the Eb/N0 of the new method is 10.52dB, and the one of the original codes is 11dB.5. Finally summarizes the overlapping method of encode and decode, and remains the parts to be improved.