Study on piecewise-linear algorithm for high performance Max-Log-MAP
Jianyi Wang · Journal of Circuits and Systems · 2012
Aiming at the existing problem that Max-Log-MAP algorithm of decoding performance is worse 0.5dB than Log-MAP algorithm and the Log-MAP algorithm has a greater complexity,the paper presents two methods involving in using the maximizing operation of piecewise-linear term (piecewise-linear term: PLT) to substitute for Jacobian formula in Log-MAP algorithm and introducing the scale factor in extrinsic information so as to optimize Turbo decoding performance. The results show that when the sub-item number r of piecewise-linear term equals 3 and the scale factor s is 0.7,the kind of decoding strategy has slightly better performance than Log-MAP algorithm,as well as the complexity increases only one multiplication,one addition and maximizing operation as compared with that of Max-Log-MAP algorithm.