TY  - JOUR
T1  - Modified Max-Log-MAP Turbo Decoding Algorithm for MIMO-OFDM System
AU - Pradeep, N.S. AU - Moses, M. Balasingh 
JO  - Asian Journal of Information Technology
VL  - 15
IS  - 6
SP  - 1005
EP  - 1014
PY  - 2016
DA  - 2001/08/19
SN  - 1682-3915
DO  - ajit.2016.1005.1014
UR  - https://makhillpublications.co/view-article.php?doi=ajit.2016.1005.1014
KW  - Log-MAP
KW  -Max-Log-MAP
KW  -scaling factor
KW  -turbo codes
KW  -OFDM
AB  - This study proposes a new Scaling Factor (SF) approach for reducing the over estimation of reliability values for Max-Log-MAP (MLMAP) turbo decoding algorithm. Modified Max-Log-MAP (M-MLMAP) algorithm is smeared by fixing an indiscriminate SF for inner decoder S<SUB>1</SUB> and an optimized, adaptive SF for the outer decoder S<SUB>2</SUB>. The performance of various scaling factors is compared and optimized scaling factor is obtained which is influenced by E<SUB>b</SUB>/N<SUB>0</SUB> with least Bit Error Rate (BER). Suitable mathematical relationship between scaling factor and E<SUB>b</SUB>/N<SUB>0</SUB> is also given. The effect of the suggested algorithm for a range of system parameters is considered in a systematic fashion, in order to gauge their performance implications. The numerical results show that the proposed M-MLMAP algorithm improves the performance of turbo decoding over Additive White Gaussian Noise (AWGN) and rayleigh fading channels. The proposed M-MLMAP is superior to MLMAP algorithm in both performance and complexity. The performance of the proposed algorithm is also analysed in Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system for suitable applications in WIMAX and LTE.
ER  -