Study of LDPC Codes Based on Matlab
Jingyi Lu · Science Technology and Engineering · 2010
LDPC codes is a kind of linear group codes with near Shannon limit.Based on studying the basic theory of LDPC codes,the impact of codes length,column weight and iteration times on BER performance of LDPC codes are demonstrated by computer simulation and theoretical analysis.The simulation experiment indicated that:LDPC code long-code error performance is superior to short-code error performance,but when the code length reaches a certain value,then increase the code length,BER of LDPC codes lower rate would be small.When the code length is small,increasing the column weight,LDPC codes performance will deteriorate;when code length is large enough,increasing the column weight,LDPC codes performance will be improved,but when the column weight reaches a certain value,as set out priority to increasing the performance of LDPC codes will be worse.To increase the number of decoding iterations,LDPC codes performance will be improved;but when the number of iterations is large enough,then increase the number of iterations,LDPC codes will no longer reduce the error rate.