An Algorithm for Construction of IRA Codes Based on Gaussian Approximation
Lei Wen · Radio and communications technology · 2007
The structure of irregular repeat accumulate codes is introduced.We analyzed Tanner graph and parity check matrix of the IRA codes.The construction of IRA codes includes the optimization of degree distribution and the design of parity check matrix.For a given noise variance,the optimized degree sequences are deduced with Gaussian approximation in AWGN channels.Then design process of the parity check matrix is given.Simulations show that the IRA codes we designed have more good performance than the LDPC codes designed by computer search and the performance becomes better with the longer code length.