Design On United Error Correcting Algebraic Soft-Decision Reed-Solomon Decoders

Due to excellent capability of examining and correcting both burst and random errors,Reed-Solomon(RS)codes are used in deep-space communication,wireless transmission and so on.RS codes can be divided into two parts by whether taking use of soft information and they are hard-decision decoding(HDD)and algebraic soft-decision decoding(ASD).Compared with ASD,HDD is more simpler and easier to realise.But It's performance is worse as it dose not make use of soft information as ASD does.Because of the excellent capability of decoding,ASD become the emphasis of the research of relative industry.The channel environment in long distance communication raised higher requirements for the RS codes,which include:(1)the capability is excellent,the computational complexity is low and the structure is simple.(2)it can recognize the special error style.(3)it can change hardware automatically based on the detected error style.But the existing algorithms and researching do not go deep into this part.This dissertation first proposes a long-burst channel model which is used into ASD and is more general.Based on this channel model,a new united error correcting algebraic soft-decision Reed-Solomon decoding architecture is proposed.The new architecture first build up new channel analysis method from original ASD based on the new channel model.Except for the soft information utilised in traditional ASD,We can also get whether there is long burst in the codeword by analysing the information in the channel.If there exists long burst,record the rough detected burst positions.If there are no long bursts,change the hardware structure to process the algorithm aiming at random errors and if the long bursts occurs,original ASD can not qualified the decoding and change the hardware structure to process the algorithm using the rough detected burst positions aiming at burst errors to ensure the coding performance.The long burst channel and AWGN channel are simulated by MATLAB code,respectively.From the experimental data,we decide the parameters in the algorithm for burst channel to maximize the algorithm performance.The unified RS decoding both for burst channel and random channel has been modeled with Verilog HDL and simulated by Modelsim simulator tool.This RS decoder is synthesized,analyzed timing and power consumption by Design Compiler and Prime Time PX with SMIC 0.13 ?m technology library.The result shows that the unified algorithm can get coding gain both in random and burst channel and it expands the application scope of RS codes.