Design And Simulation Of Turbo Coding And Decoding Under Non-Gaussian Noise Channel

This issue is under study in non-Gaussian noise channel Turbo encoding and decoding of design and simulation.It is an object-oriented background is designed to communicate through.Super low frequency carrier at the time by rocks and other media less attenuation and therefore used as a carrier.In order to satisfy the carrier in the case of very low frequency,to achieve penetrating communication needs to be done at very low frequency channel coding,the encoding type on the choice of the superior performance of Turbo codes,thus this issue emerged.Codec design Turbo codes can be divided into four stages.First,the study coding theory Turbo code,understand the advantages and disadvantages coding mode,master design Turbo code component code;Second,study the structure of Turbo code decoding,learning some typical main decoding algorithm,master its iterative decoding;Third,research interleaver works,specifically the various interleaving the interleaved principle,the advantages and disadvantages of various interleaver,according to need to design the system to select the appropriate interleaving,and finally is summarized simulation,based on more than three-part study,which combine performance simulation,to find a higher cost of design systems,to achieve the requirements of communication systems.Simulation of comparison by the end,set the default SNR 2dB,iterative decoding when the number as an argument,to study its bit error rate.Ultimately,the choice(7,5)convolutional code code code components most Turbo code,use Log-MAP algorithm as the decoding algorithm as pseudo-random interleaver Interleaver design,through simulation experiments,iterations and get a bit error rate curve.After characteristic curve analysis,it was confirmed that the system can achieve lower bit error rate of communication.Putting this system into practice in a national defense tunnel with a depth of 100 meters,we can get real-time and error-free communication.It has proved that this communication system can meet the communication requirements and basically meet the design requirements.